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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Vishay 6DFN51A-M3/H

Name: 6DFN51A-M3/H
Brand: Vishay
SKU: 6DFN51A-M3/H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 6DFN51A-M3/H

Manufacturer:: Vishay

Category:: TVS Diodes

Package:: 2-VDFN

Datasheet:: 6DFN51A-M3/H.pdf

Description:: 600W,51V 5%, DFN3820A TVS

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Product details

Overview

6DFN51A-M3/H from Vishay General Semiconductor is a unidirectional surface-mount TRANSZORB® transient voltage suppressor in DFN3820A package, rated for 51 V breakdown voltage (V_BR), 43.6 V stand-off voltage (V_WM), 600 W peak pulse power (10/1000 μs), 8.6 A peak pulse current, and 70.1 V maximum clamping voltage (V_C). It protects MOSFETs and ICs in industrial sensor signal lines against lightning-induced transients.

For engineers reviewing the 6DFN51A-M3/H datasheet, 6DFN51A-M3/H pinout, 6DFN51A-M3/H application, or 6DFN51A-M3/H equivalent, key selection criteria include clamping voltage margin relative to protected device V_DS/V_CC, thermal resistance (R_θJM = 5 °C/W), IEC 61000-4-2 ±30 kV ESD immunity, and MSL Level 1 reflow compatibility at 260 °C.

Technical Context

This unidirectional TVS diode uses passivated anisotropic rectifier technology optimized for low-leakage, fast-response transient suppression. Its DFN3820A package features side-wettable flanks for AOI-compatible solder joint inspection and achieves R_θJM = 5 °C/W via direct thermal path to PCB copper.

It operates across -65 °C to +175 °C junction temperature range with 0.093 %/°C V_BR temperature coefficient and meets JESD201 Class 2 whisker resistance. Clamping performance is specified under standardized 10/1000 μs surge waveform per ANSI/IEEE C62.35.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR (min/typ/max)	48.5 / 51.0 / 53.6 V - ensures reliable conduction onset above system operating voltage while maintaining margin against false triggering
V_WM	43.6 V - maximum continuous reverse voltage before leakage exceeds 1 μA, compatible with 36–42 V nominal industrial bus rails
V_C @ I_PPM	70.1 V - clamping voltage during 8.6 A surge, limiting stress on downstream 75 V-rated MOSFETs or logic inputs
P_PPM	600 W (10/1000 μs) - energy-handling capacity sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges
T_J max	+175 °C - enables operation in high-temperature environments such as motor drive enclosures or automotive under-hood modules
R_θJM	5 °C/W - low junction-to-mount thermal resistance supports sustained surge duty cycles when mounted on ≥2 oz. copper pads

Pinout & Package

Package: DFN3820A - 2-terminal, leadless, halogen-free, RoHS-compliant surface-mount package with 0.88 mm typical height, side-wettable flanks, and matte tin-plated terminals solderable per J-STD-002.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Positive terminal of unidirectional TVS	Connected to protected line (e.g., sensor V_OUT or MOSFET drain); forms low-impedance path to ground during overvoltage
Cathode	Negative terminal (marked by color band)	Connected to system ground reference; defines polarity-reverse-biased during normal operation, avalanches during transients

Key Features

Feature	Design Value
Side-wettable flanks	Enables automated optical inspection (AOI) of solder fillets without X-ray, reducing post-reflow defect escape in high-volume SMT lines
MSL Level 1 rating	Allows unlimited floor life and single reflow at 260 °C peak, eliminating bake requirements and simplifying manufacturing logistics
IEC 61000-4-2 ±30 kV ESD immunity	Provides robust protection for human-contact interfaces (e.g., front-panel buttons, USB ports) without external ESD diodes
Junction passivation	Minimizes reverse leakage (<1 μA at V_WM) across temperature, preserving battery life in always-on sensor nodes

Applications

Industrial Sensor Signal Protection	Automotive Body Control Module Inputs
Use Scenario: Protecting analog output lines (4–20 mA, 0–10 V) of pressure/temperature sensors in factory automation cabinets exposed to relay coil flyback and nearby welding equipment. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground, clamping transients within 1 ns to prevent op-amp input damage. Use Value: 70.1 V clamping voltage ensures protected ADC input (rated 75 V abs max) remains within safe operating area during 1 kV/2 Ω surges.	Use Scenario: Safeguarding LIN bus input pins of door module microcontrollers against load dump and jump-start induced spikes in 12 V vehicle systems. IC Role / Device Role / Timing Role: Standoff device shunting transient energy to ground before it reaches MCU GPIO, leveraging 43.6 V V_WM to avoid interference with 12 V LIN signaling. Use Value: 600 W pulse rating handles ISO 7637-2 Pulse 1 (−150 V, 50 ms) energy without degradation after repeated events.
Medical Patient Monitor Analog Front-End	Telecom Power Supply Input Stage
Use Scenario: Shielding ECG/EEG electrode interface amplifiers from ESD events during clinical handling and defibrillator coupling. IC Role / Device Role / Timing Role: First-line transient suppressor at connector entry point, placed ahead of precision instrumentation amplifier input stage. Use Value: <1 μA leakage at 43.6 V preserves DC accuracy of sub-μV-level biopotential measurements over full temperature range.	Use Scenario: Suppressing AC line surges coupled into 48 V telecom rectifier outputs feeding PoE injectors and baseband processors. IC Role / Device Role / Timing Role: Secondary protection device downstream of MOV-based primary clamping, absorbing residual high-frequency ring. Use Value: 0.093 %/°C V_BR tempco ensures stable clamping threshold across -40 to +85 °C ambient, critical for outdoor cabinet reliability.

Industrial Sensor Signal Protection

Automotive Body Control Module Inputs

Use Scenario: Protecting analog output lines (4–20 mA, 0–10 V) of pressure/temperature sensors in factory automation cabinets exposed to relay coil flyback and nearby welding equipment.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground, clamping transients within 1 ns to prevent op-amp input damage.

Use Value: 70.1 V clamping voltage ensures protected ADC input (rated 75 V abs max) remains within safe operating area during 1 kV/2 Ω surges.

Use Scenario: Safeguarding LIN bus input pins of door module microcontrollers against load dump and jump-start induced spikes in 12 V vehicle systems.

IC Role / Device Role / Timing Role: Standoff device shunting transient energy to ground before it reaches MCU GPIO, leveraging 43.6 V V_WM to avoid interference with 12 V LIN signaling.

Use Value: 600 W pulse rating handles ISO 7637-2 Pulse 1 (−150 V, 50 ms) energy without degradation after repeated events.

Medical Patient Monitor Analog Front-End

Telecom Power Supply Input Stage

Use Scenario: Shielding ECG/EEG electrode interface amplifiers from ESD events during clinical handling and defibrillator coupling.

IC Role / Device Role / Timing Role: First-line transient suppressor at connector entry point, placed ahead of precision instrumentation amplifier input stage.

Use Value: <1 μA leakage at 43.6 V preserves DC accuracy of sub-μV-level biopotential measurements over full temperature range.

Use Scenario: Suppressing AC line surges coupled into 48 V telecom rectifier outputs feeding PoE injectors and baseband processors.

IC Role / Device Role / Timing Role: Secondary protection device downstream of MOV-based primary clamping, absorbing residual high-frequency ring.

Use Value: 0.093 %/°C V_BR tempco ensures stable clamping threshold across -40 to +85 °C ambient, critical for outdoor cabinet reliability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ51A	DO-214AC package, higher R_θJA (110 °C/W), same V_BR/V_C specs but 1.9 mm height vs. 0.88 mm	Less suitable for ultra-thin consumer devices or dense PCB layouts where Z-height is constrained	Select SMAJ51A only if legacy through-hole or larger footprint is acceptable and AOI is not required
SMCJ51A	DO-214AB package, 1500 W rating, 1.2 mm height, no side-wettable flanks, MSL Level 1 not guaranteed	Better for high-energy surges but incompatible with automated optical inspection and tighter thermal management needs	Choose SMCJ51A when surge energy exceeds 600 W and board space allows larger 7.11 × 6.22 mm outline

Compared with SMAJ51A and SMCJ51A, the 6DFN51A-M3/H delivers identical electrical protection performance in a 3.95 × 2.18 mm DFN3820A package with AOI-ready side-wettable flanks, enabling higher assembly yield and smaller footprint-critical for space-constrained industrial and medical edge devices.

Availability

6DFN51A-M3/H is available at Aetrix Electronics and suitable for industrial sensor protection, automotive body electronics, medical analog front-ends, and telecom power supply input stages requiring stable component supply, long-term lifecycle support, and consistent MSL Level 1 reflow compliance.

Supply support for 6DFN51A-M3/H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay General Semiconductor designs and manufactures discrete semiconductors including diodes, rectifiers, and transient suppressors, with emphasis on high-reliability, industry-standard packaging and AEC-Q101 qualification.

The 6DFN51A-M3/H belongs to Vishay's TRANSZORB® DFN family, engineered specifically for compact, high-density PCBs in harsh environments where low-profile mounting, AOI compatibility, and repeatable surge immunity are mandatory.

FAQ

What is the maximum clamping voltage of the 6DFN51A-M3/H under a 10/1000 µs surge?

The 6DFN51A-M3/H has a maximum clamping voltage (V_C) of 70.1 V when subjected to its rated peak pulse current of 8.6 A under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream components such as 75 V-rated MOSFETs or microcontroller I/O pins. The 6DFN51A-M3/H maintains this clamping performance across its full operating temperature range.

Does the 6DFN51A-M3/H meet automotive qualification standards?

The 6DFN51A-M3/H carries the "H" suffix in its ordering code, indicating AEC-Q101 qualification per Vishay's internal documentation and product family specification. It is rated for operation from -65 °C to +175 °C junction temperature and passes JESD201 Class 2 whisker testing. While not explicitly labeled "automotive grade" in the datasheet revision cited, the 6DFN51A-M3/H is qualified and widely deployed in automotive body control modules and sensor interfaces. Always verify latest qualification status via Vishay's official AEC-Q101 certificate for 6DFN51A-M3/H.

How does the DFN3820A package of the 6DFN51A-M3/H support automated optical inspection (AOI)?

The 6DFN51A-M3/H uses a DFN3820A package with side-wettable flanks-exposed metal on the vertical edges of the terminals-that allow solder paste wetting to be optically verified after reflow. This eliminates reliance on X-ray inspection for solder joint quality assurance. The feature directly supports high-yield SMT lines where AOI is standard practice, and is confirmed in the Vishay datasheet under "Leadless DFN package with side-wettable flanks suitable for customer AOI." The 6DFN51A-M3/H leverages this design for zero-defect manufacturing in mission-critical applications.

What is the thermal resistance from junction to mount (R_θJM) for the 6DFN51A-M3/H?

The 6DFN51A-M3/H has a typical junction-to-mount thermal resistance (R_θJM) of 5 °C/W, measured using JEDEC® 51-14 Transient Dual Interface Method (TDIM). This low value reflects efficient heat transfer from the silicon die directly into the PCB copper pad beneath the device, enabling sustained surge handling without excessive temperature rise. The 6DFN51A-M3/H achieves this via its thermally enhanced DFN3820A construction and requires proper mounting pad layout per Vishay's recommended footprint to realize the specified R_θJM.

Is the 6DFN51A-M3/H compatible with lead-free reflow profiles?

Yes, the 6DFN51A-M3/H is fully compatible with lead-free reflow processes, meeting MSL Level 1 per J-STD-020 with a maximum peak temperature of 260 °C. Its matte tin-plated terminals comply with J-STD-002 and JESD22-B102 solderability standards, and the M3 suffix confirms halogen-free, RoHS-compliant, Pb-free construction. The 6DFN51A-M3/H can undergo standard IPC/JEDEC J-STD-020-compliant reflow without preconditioning or baking, supporting high-throughput manufacturing of environmentally compliant assemblies.

6DFN51A-M3/H Specifications

Product attributes: Attribute value

Manufacturer:: Vishay

Package/Case:: 2-VDFN

Series:: TRANSZORB®

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 43.6V

Voltage - Breakdown (Min):: 48.5V

Voltage - Clamping (Max) @ Ipp:: 70.1V

Current - Peak Pulse (10/1000µs):: 8.6A

Power - Peak Pulse:: 600W

Power Line Protection:: No

Applications:: Telecom

Capacitance @ Frequency:: -

Operating Temperature:: -65°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: DFN3820A

6DFN51A-M3/H FAQ

1.How can I place an order for 6DFN51A-M3/H through Aetrix?

Please submit a Request for Quotation (RFQ) for 6DFN51A-M3/H on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 6DFN51A-M3/H reliable?

The price and inventory of 6DFN51A-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 6DFN51A-M3/H is usually 5 days.

3.What payment methods are accepted for 6DFN51A-M3/H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 6DFN51A-M3/H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 6DFN51A-M3/H?

6DFN51A-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 6DFN51A-M3/H order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 6DFN51A-M3/H?

For technical support, including 6DFN51A-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 6DFN51A-M3/H requirements.

6.How does Aetrix verify that 6DFN51A-M3/H is sourced from the original manufacturer or authorized distributors?

All 6DFN51A-M3/H products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 6DFN51A-M3/H meets industry standards.

7.What is the process for return or replacement of 6DFN51A-M3/H?

All 6DFN51A-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with 6DFN51A-M3/H, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 6DFN51A-M3/H part is unused and in its original packaging.

Return procedure for 6DFN51A-M3/H:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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