Surface mount diode

Surface mount diode. Follow asked Jan 25, 2019 at 22:57. com August 2019 © Diodes Incorporated SMB Surface Mount Reel Specifications Tape Width Reel Size DC–15 GHz Surface Mount Limiter PIN Diode Microsemi Proprietary and Confidential. They have a specific voltage Apr 2, 2024 · Before testing a diode, we have to first identify the terminals of the diode i. 11 - Rev. 53 1 1 silver badge 5 5 bronze badges \$\endgroup\$ Add a Available in conventional surface mount packages and eSMP® package series for comprehensive applications in automotive such as advanced driver assistance systems (ADAS)and safety Robust glass passivated technology in conventional surface mount and power packages are available for harsh environment applications in industrial and automotive. Ideally suited for low voltage, high frequency rectification, or as free wheeling and polarity diodes in surface mount applications where compact size and weight are critical to the system. 0W SURFACE MOUNT ZENER DIODE Keywords Dec 22, 2021 · Many surface-mounted devices (SMDs) are polarized components, such as light-emitting diodes (LEDs), diodes, tantalum capacitors, ICs, etc. Also get the dimensions of the part with a ruler or (preferably) calipers and match them up with a chart, write them down for a later step. 0 mm) copper pads to each terminal PRIMARY CHARACTERISTICS VBR unidirectional 6. Free shipping on qualifying orders! sciences, has the broadest product offering of surface mount Schottky and PIN diodes available today. 25 SERIES SURFACE MOUNT HYPERABRUPT TUNING VARACTOR DIODES Skyworks Solutions, Inc. 68 It is the MM3Z5V6T1G - a 5. skyworksinc. 0SMC Series Surface Mount part specifications and more from the Littelfuse selection of TVS Diodes. They use instead a marking code typically composed of a combination of 2 or 3 let… Dec 9, 2021 · Part 4: Identify SMD Diodes and SMD Triodes. 6V Zener diode from OnSemi in SOD-323 package. , its Anode and Cathode. 2 SMB Package Information Rev. Surface Mount Type （Unit : mm Package - Diodes Datasheet 2/2 2013. Surface-Mount ESD Protection Diodes. There are several manufacturers who make this part with a JY code including Nexperia and OnSemi. 65 V Reverse voltage: 5 V - 440 V. 33 pF Low-profile, ultra-miniature QFN (3-pin, 2 x 2 mm) package (MSL1, 260 C per JEDEC J-STD-020) Anode (Pin 1) Anode (Pin 3) metal−to−silicon power diode. SMD Packaging Sizes for Passive Components. Diodes Incorporated Subject: SURFACE MOUNT FAST SWITCHING DIODE Keywords: Fast switching speed Ideally suited for automatic insertion For general purpose switching applications Lead-Free Finish; RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Let’s now dig deeper into each of these two lighting options. e. State of the art geometry features epitaxial construction with oxide passivation and metal overlay contact. Ideally suited for low. www. Jan 11, 2019 · If you use surface mount diodes or LEDs, you probably understand the challenges involved in correctly and consistently indicating diode polarity. com • www. diodes. So What Is A Surface-Mounted Diode? Before tackling this question, it’s good to know that a “Diode” is a semiconductor device with two terminals, typically allowing the flow of electrical current in one direction only. 5A 800V SMT Fast Soft-Recovery Avalanche Diode Rectifier Philips BYD37K . Schottky diodes are used in high-frequency applications, such as radio frequency (RF) circuits and switching power supplies. The table below outlines, from smallest to largest, the physical dimensions for standard SMD Surface Mount Diodes. About the Products The Avago HSMS-2xxx and HMPS-xxxx series of Schottky-barrier diodes provide the most consistent performance available. When currents flow from the positive electrode, the diode's resistance is extremely small. Surface-mount technology (SMT), originally called planar mounting, [1] is a method in which the electrical components are mounted directly onto the surface of a printed circuit board (PCB). There is not a great place to put a stripe on the Jul 27, 2023 · From the typical passive chip resistors, chip capacitors, through semiconductor diodes, LED diodes, transistors, and various very large-scale integration components (IC). To better understand these electrical parts, let’s compare them against the alternative, which are through-hole components. 4V to 47V due to an ion-implanted epitaxial wafer process. Diodes Incorporated's product packaging: Product Carton and Product Label Specifications, Surface Mount (SMD) Packaging, Through-hole Packaging, etc Diodes Incorporated Subject: SURFACE-MOUNT SCHOTTKY BARRIER DIODE Keywords: The BAT64T5Q 250mA surface-mount Schottky Barrier Diode in SOD523 package offers low turn-on voltage and fast switching capability, designed with PN junction guard ring for transient protection. Halogen-Free and RoHS compliant For surface mounted applications in order to optimize board space Low profile package Built-in strain relief Glass passivated junction Low Inductance Excellent clamping Author: Diodes Incorporated Subject: 1500W SURFACE-MOUNT TRANSIENT VOLTAGE SUPPRESSOR Keywords DATA SHEET • CLA4610-085LF: Surface-Mount Limiter Diode Skyworks Solutions, Inc. DO-213. 40 V to 231 V VBR bidirectional 6. Products within the single rectifier diode family are used to allow current flow in one direction only, and implement exactly one instance of this function per device package. Surface Mount Zener Diodes LINKS TO ADDITIONAL RESOURCES FEATURES • Plastic package has underwriters laboratory flammability classification 94 V-0 • For surface mounted applications • Low Zener impedance • Low regulation factor • High temperature soldering guaranteed: 260 °C/10 s at terminals Mar 25, 2022 · The M7 is a high voltage surface mount diode that is analogous to the popular 1N4007, with a high reverse breakdown voltage of 1kV and a continuous current capacity of 1A. 1N914 – Diode 100 V 200mA Through Hole DO-35 from onsemi. 30 More Info. 2 V - 748. The DO-213 package is a Surface Mount Device [SMD]. M7 – Diode 1000 V 1A Surface Mount DO-214AC (SMA) from Diotec Semiconductor. An ' L ' or ' W ' suffix usually indicates a low-profile package, such as an SOT323 or SC70 . Polarity identification of these electrolytic SMD components can avoid SMD polarity reversal during PCB assembly. Diodes are also polar components, and the positive and negative electrodes can't be reversed. Most of the PN Junction diodes have a white band on its body and the terminal near this white band is the cathode. Surface Mount Diodes Molded, and formed lead diodes. Some of the most popular SMDs include 0603, 0805, 1206, plcc2, plcc4 and currently the world's smallest LED, the 0402 LED. These diodes feature Order today, ships today. It is common knowledge for electronics designers that the cathode of the device is the end that should be somehow marked, but manufacturers do not always follow this standard. Mar 11, 2021 · Some devices have a single coloured letter (usually on extremely small diode packages). These diodes use the larger DO-201AD axial package to dissipate heat better. Cite. 5pF · Low Leakage Current: Maximum of 500nA at 80V · Small Surface Mount Package · Thermally Efficient Our standard rectifiers provide high surge capacity and efficiency in over 14 different product types, allowing for greater possibilities when selecting a part. 1N5818 – Diode 30 V 1A Through Hole DO-41 from STMicroelectronics. 40 V to 231 V VWM 5. After over a decade in business, Diode Dynamics is one of the most trusted names in automotive LED lighting. S1A – Diode 50 V 1A Surface Mount DO-214AC (SMA) from SMC Diode Solutions. Jun 8, 2022 · This diode seem to have a huge input. 1 V @ I F (A) Modern surface mount electronic components are often too small to write the part number on so a 2, 3 or 4 digit code is often used. 1N4148W-7-F – Diode 100 V 300mA Surface Mount SOD-123 from Diodes Incorporated. Our Zener diodes enjoy tolerances as tight as ±2. They are commonly used in voltage regulation, signal demodulation, and power conversion. Review Diodes' datasheet to determine if the device is an exact drop-in replacement or similar device. Feb 16, 2023 · When developing lighting and indicator devices, surface mounted diode (SMD) LEDs offer a variety of benefits. The key marking is JY, with L probably being a date code. TVS Diode Arrays Surface Mount TVS Avalanche Diode Array SP0502BA, SP0503BA, SP0504BA, SP0505BA, SP0506BA The surface mount family of arrays are designed to suppress ESD and other transient overvoltage events. S1M – Diode 1000 V 1A Surface Mount DO-214AC (SMA) from SMC Diode Solutions. S320 – Diode 200 V 3A Surface Mount DO-214AA (SMB) from onsemi. Jul 10, 2024 · Surface-mount components are electrical parts mounted directly on the surface of PCBs, specifically on solder pads, to make electrical contact with the circuit. S3GB-13-F – Diode 400 V 3A Surface Mount SMB from Diodes Incorporated. Sort By: View: 1. Colour, if significant, is shown in small type after the code letter. These Multi-Color SMD LEDs are suitable for use in a wide variety of electronic equipment, including notebook computers, network systems, home appliances, and indoor signboard applications. DUAL SURFACE-MOUNT SWITCHING DIODE Features Fast Switching Speed Surface-Mount Package Ideally Suited for Automated Insertion Below are a few examples of diodes. Understanding The SMP1302-085LF is a surface mountable, low capacitance silicon PIN diode in a low thermal resistance QFN-2, 2 x 2 mm plastic package. Learn more about TVS diode selection, parameters, applications and technologies from Littelfuse. Surface Mount. Both through-hole and surface mount Diodes have this marking. They use instead a marking code typically composed of a combination of 2 or 3 letters or digits. Jun 28, 2024 · SMD Diodes: SMD Diodes allow electrical current to flow in one specific direction. Find 3. It is mainly found in bridge rectifiers in power supplies and other electronic appliances. SMD diodes are unidirectional conductive electronic components. 3A 200V SMT Ultrafast Aug 26, 2016 · surface-mount; Share. And the remaining one is anode. They include low barrier diodes and zero-bias detectors that combine Skyworks advanced semiconductor technology with low-cost packaging techniques. What is SMD LED? SMD (Surface-mounted devices) is a led chip mounted on the surface of a PCB (printed circuit board). To discuss your requirement please call +44 (0)1793 784389 and talk to a member of our technical sales team. 0 2 2 Product Overview This SMT limiting diode element consists of a specially processed PIN diode packaged in a convenient, low-cost plastic outline suitable for standard or co-planar microstrip circuits. SMD Transistors: Devices in the semiconductor category that boost or toggle electronic signals. Jan 25, 2019 · diodes; surface-mount; Share. DC voltage: 9. These Schottky devices provide high breakdown voltages with true Schottky characteristics, including low turn-on voltages, to provide fast switching times. 715V at 1mA · Fast Reverse Recovery: Maximum of 4ns · Low Capacitance: Maximum of 1. Vice versa, the resistance is extremely large. Features Jan 31, 2022 · Surface mount diodes are either lead-less-Melf or 2-terminal SOD designs. Image Credit: Pixabay. SS34 – Diode 40 V 3A Surface Mount DO-214AB (SMC) from onsemi. Avago uses a first-in-class wafer fab to ensure repeat-ability from wafer to wafer. Specially designed for use with automatic insertion equipment with increased creepage distance between the anode and cathode, 2kV, 3kV, 5kV and 15kV, 100nS-, 70nS, 50nS, 30nS and High Temperature, 200°C, 2kV, 3kV, and 5kV Diodes. These low-cost, surface mountable, plastic packaged silicon mixer Schottky diodes are designed for RF and microwave mixers and detectors. [2] [3] Diodes with similar ratings are available in SMA and MELF surface mount packages (in other part number series). LEDs are usually cathode negative, while zeners and uni-directional TVS diodes can be cathode positive. Jul 29, 2019 · I am attempting to repair a circuit board where this particular Zener Diode is fried. 0% in voltages ranging from 2. Dec 6, 2023 · The part is most likely a BAV199L dual diode, datasheet here. At the bottom are a couple surface mount diodes, each of which use a line to mark which pin is the cathode. 7A) • Low VF, fast switching Schottky • ZLLS500 complements low temperature equivalent ZHCS500 • Package thermally rated to 150°C • Qualified to AEC-Q101 Standards We offer a wide variety of Gallium Arsenide (GaAs) and Silicon PIN diodes to suit your application requirements. Aug 26, 2021 · The two main types of LED downlights are the surface mount diode (SMD) downlights and chip on board (COB) downlights, which have unique advantages. Oct 17, 2023 · Another type of SMD diode is the Schottky diode, known for its low forward voltage drop and fast switching speed. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc. 1N400 series; M-series, and S-series SMD diodes; 1N58-series, SS-series, and SR series Schottky diodes, FR, UF, SF, MUR, and HER series Fast recovery diodes; Surface Mount. Per industry specifications, passive surface-mount components fall into several packages of varying sizes. I think the diode is being used as some sort of voltage regulator/rectifier, but the area after the diode is expecting a 6V input and in fact removing the diode and supplying just 6V makes the circuit work as expected. These arrays are used to meet the International Electrotechnical Compatibility (IEC transient immunity stan- Surface Mount SILICON ZENER DIODES MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS Ratings at 25 oC ambient temperature unless otherwise specified. Since SMD components require fewer drilled holes, they incorporate higher routing density, and the design becomes more compact. Note that sometimes the package pins are underneath the part or extended away from the part. Features epitaxial construction with oxide passivation and metal overlay contact. This search engine designed to help identify the part from this code. Step 1) Identify the package, note how many pins, match up the pins first. 0W SURFACE MOUNT ZENER DIODE Features 1. Experience. MM3Z12VB – Zener Diode 12 V 200 mW ±2% Surface Mount SOD-323F from onsemi. One is a regular LED, and the other is a more advanced type that’s called an SMD or “Surface-Mounted Diode”. Featuring low-loss, low SURFACE MOUNT ZENER DIODE Features D G TOP VIEW Cathode Indicator H B C R N A • Ultra-Small Leadless Surface Mount Package • Ideally Suited for Automated Assembly Processes • Lead Free By Design/RoHS Compliant (Note 1) • "Green" Device (Note 2) • Qualified to AEC-Q101 Standards for High Reliability Mechanical Data • Case: DFN1006-2 metal−to−silicon power diode. Surface Mount Single Diodes. A Order today, ships today. Ideally suited for low voltage, high frequency rectification, or as free wheeling and polarity protection diodes, in surface mount applications where compact size and weight are critical to the system. Order today, ships today. 1A SURFACE MOUNT GLASS PASSIVATED RECTIFIER Configuration: Single MaximumAverageRectifiedCurrent I O (A) 1 A Peak ForwardSurge CurrentI FSM (A) 30 A Peak RepetitiveReverse VoltageV RRM (V) 400 V Forward VoltageDrop V F (V) 1. Resistive or inductive load. GC4701-6LP Datasheet Revision 2. [2] An electrical component mounted in this manner is referred to as a surface-mount device (SMD). M7 Diode Pinout Description PCN # Issue Date Implementation Date Subject; PCN-2690: 2024-05-29: 2024-08-29: Qualification of Diodes’ subcontractor Eris Technology Corporation (Eris) in Taoyuan, Taiwan as Additional Assembly & Test Site and Diodes internal JKFAB in HsinChu, Taiwan as additional wafer source for Select Discrete Products. 0 mm x 8. This surface mount kit allows you to mount your Stage Series Rock Light on any flat surface. 1SMB5913B SMB Dimensions in inches and (millimeters) FEATURES * Glass passivated chip * Built-in strain relief * Low inductance * High peak reverse power dissipation Switching Diode, High Speed, 100 V Features • SOD−123 Surface Mount Package • High Breakdown Voltage • Fast Speed Switching Time • S Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q101 Qualified and PPAP Capable • These Devices are Pb−Free, Halogen Free/BFR Free and are Oct 5, 2016 · Modern surface-mount diodes don’t always use this simple marking scheme. 0W Power Dissipation 1. Our products range from ultra-low Cj, beam lead PIN diodes for broadband switching, to high-power PIN diodes that are designed for frequencies up to 40 GHz. I have attempted to search for any references to Zener diodes that are marked 8•9 (and 6•8) without success. CLA4603-085LF: Surface-Mount Limiter Diode Applications Low-loss, high-power limiters Receiver protectors Features Low thermal resistance: 96 °C/W Typical threshold level: +9 dBm Low capacitance: 0. com 201431C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 9, 2012 3 Order today, ships today. com SMAZ5V1 - SMAZ39 1. 31" (8. Littelfuse specializes in transient voltage suppression (TVS) diodes, which are designed to protect semiconductors from damage due to transient voltages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Diode Type-Avalanche PIN PIN - Single Planar Diffusion Schottky. com 203116D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • June 25, 2020 6 Our Silicon (Si) and Gallium Arsenide (GaAs) Schottky diodes are frequently used as mixers, signal detectors or limiters. 150 °C Polarity Unidirectional, bidirectional Package SMC (DO-214AB) SMC (DO-214AB) Cathode Surface-Mount Package Ideally Suited for Automated Insertion UL Flammability Classification Rating 94VFor General-Purpose Switching Applications Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Order today, ships today. These SMD components are smaller than the through-hole components and comprise a small lead or no lead at all. Maximum resistance at 100 mA is 1. Surface-Mount Schottky Barrier Rectifier LINKS TO ADDITIONAL RESOURCES FEATURES • Low profile package • Ideal for automated placement • Guardring for overvoltage protection • Low power losses, high efficiency • Low forward voltage drop • High surge capability • Meets MSL level 1, per J-STD-020, LF maximum peak of 260 °C Find SMDJ Series Surface Mount part specifications and more from the Littelfuse selection of TVS Diodes. C Leaded Type TO-220FN Surface Mount Single Diodes Products within the single rectifier diode family are used to allow current flow in one direction only, and implement exactly one instance of this function per device package. Tom Carpenter. all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Created Date: 8/11/2023 3:03:40 PM Due to the small size of most SMD components, manufacturers are not able to write the full part number on the case. Below that, a 1N4148 signal diode uses a black ring to mark the cathode. Title: 1N4148WSF Author: Diodes Inc Subject: SURFACE MOUNT FAST SWITCHING DIODE Keywords: 1N4148WSF SURFACE MOUNT FAST SWITCHING DIODE SOD323F · Fast Switching Speed · Low Forward Voltage: Maximum of 0. BAT41 - 100 V, 200 mA Surface Mount General Purpose Signal Schottky Diode, BAT41KFILM, BAT41ZFILM, STMicroelectronics Surface mount diodes (SMDs) in nearly all sizes can be found in this category. 2019-08-30 5 of 5 www. 31" x 0. “Green” Device (Note 3) Created Date: 3/22/2022 12:44:42 PM List of Diodes' packaging materials, including outlines and specifications for BCD, carton, label, SMD, and through-hole product packaging. [6] [7] inverters, converters and freewheeling diodes for consumer, automotive, and telecommunication. 5 W IFSM (unidirectional only) 200 A TJ max. A 20-degree rubber mount is included if you would like to mount your rock lights at an angle. The top diode, a 1N4001 rectifier, has a grey ring near the cathode. XxLogo XxLogo. SMT is a broad term that encompasses the entire surface-mount assembly process, while SMD refers specifically to those components mounted using the SMT process. Threaded Socketable Surface Mount Surface Mount, Right Angle Surface Mount, May 2, 2022 · Lite-On Multi-Color SMD LEDs are surface-mounted Light Emitting Diodes in miniature sizes and special configurations for automated PC board assembly. CBA CTLSH1-40M322 TLM322 SURFACE MOUNT HIGH CURRENT, LOW VF SILICON SCHOTTKY RECTIFIER CBA SN74LVC1G06MDCKREP SN74LVC1G06-EP SC-70-5 Enhanced Product Single Inverter Buffer/Driver With Open-Drain Output CBAx NCS2200SQ2T2 NCS2200 SC70-5 Low Voltage Comparator CBQ 2SC4132 MPT3 Power NPN Transistor (120V, 1. Responsivity @ nm. 5 W power supplies, freewheeling diodes, DC/DC converters, or polarity protection application. This package style is also called a MELF package; Metal electrode leadless face (MELF) is a type of leadless cylindrical electronic surface mount device that is metallized at its ends. For example, many light-emitting diodes have unusual polarity marks. Vishay manufactures one of the world’s largest portfolios of discrete semiconductors and passive electronic components that are essential to innovative designs in the automotive, industrial, computing, consumer, telecommunications, military, aerospace, and medical markets. Barrier diodes can be either orientation. State−of−the−art geometry features epitaxial construction with oxide passivation and metal overlay contact. Either around 200 DC or 600 AC couldn't confirm that. MECHANICAL DATA Case: SMA (DO-214AC) Molding compound meets UL 94 V-0 flammability rating Base P/N-E3 - RoHS-compliant, commercial grade Base P/N-M3 - halogen-free, RoHS-compliant, commercial grade Base P/NHE3_X - RoHS-complia nt and AEC-Q101 qualified -Chassis Mount Chassis, Stud Mount Stud Mount Surface Mount Surface Mount, Wettable Flank Through Hole Package / Case 2-SMD, Flat Leads 2-SMD, Gull Wing 2-SMD, No Lead 2-XDFN 3-SMD, No Lead 6-TSSOP, SC-88, SOT-363 0201 (0603 Metric) 0302 (0805 Metric) 0402 (1006 Metric) 0503 (1308 Metric) 0603 (1608 Metric) 0805 (2012 Metric) Standard LEDs - SMD Small 1608size surface mount type, 940nm NIR (Near Infrared) LED Learn More about ROHM Semiconductor rohm csl1002r3t1 standard led Datasheet Order today, ships today. Pricing and Availability on millions of electronic components from Digi-Key Electronics. [4] Zener diodes are another type of SMD diode, used for voltage regulation. 0 V to 188 V PPPM 1500 W PD 6. These Zener diodes are packaged in a broad range of Surface-Mount and leadless packages to enable them with a wide range of capabilities. MECHANICAL DATA Case: SMPC (TO-277A) Molding compound meets UL 94 V-0 flammability rating Base P/N-M3 - halogen-free, RoHS-compliant, and commercial grade Base P/NHM3_X - halogen-free, RoHS-compliant, and AEC-Q101 qualified (“_X” denotes revision code Surface Mount Schottky Power Rectifier SMB Power Surface Mount Package SS22T3G, SS24T3G, NRVBSS24T3G, NRVBSS24NT3G These devices employ the Schottky Barrier principle in a metal−to−silicon power rectifier. Diodes I've tried so far Super Bright LEDs offers specialty lighting solutions. Follow edited Aug 26, 2016 at 1:09. Long Surface Mount Diodes (SLA, SLP and SLU series) Cross Reference information is based upon Diodes' marketing research. (2) Mounted on 0. Littelfuse offers a broad range of TVS diodes, including high peak pulse current and power options, for protecting electronic circuits against transients and overvoltage. The SMP1302-085LF is designed as a shunt connected PIN diode for high power, high volume switch and attenuator applications from 10 MHz to beyond 6 GHz. Learn the options available—including multi-color SMD LEDs—and the advantages they provide. Browse our surface mount TVS diodes below. All diodes are Jul 30, 2020 · A closeup of a printed circuit board with passive surface-mount components. Types include BJT and FET. [4] [5] The 1N540x (or 1N5400) series is a similarly popular family of diodes rated 3 Amperes. Surface-mount devices are mounted directly to a PCB. 5A) Oct 7, 2021 · Due to the small size of most SMD components, manufacturers are not able to write the full part number on the case. Diodes assumes that the information is accurate, but bears no liability due to incorrect or incomplete information or other errors. 1N4148W T4 – Diode 100 V 150mA Surface Mount SOD-123 from MDD. Shop 2835, 5050, and 5630 type SMD LED chips here. Surface Mount Technology (SMT) diodes can be particularly tricky when it comes to proper orientation. Our Price: $0. HVCA surface mount diodes suitable for high voltage bridges or rectifier circuits mounted on PCBs which find application inside size critical high voltage power supplies and inverters. SURFACE MOUNT SCHOTTKY BARRIER DIODE Keywords: ZLLS500 SURFACE MOUNT SCHOTTKY BARRIER DIODE SOT23 • Extremely low leakage (10μA @30V) • High current capability (IF = 0. fjuybzm axmna kcsfls hjtu mahkm nso ncdl bbbqmdpnc vvdq iufm