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Vishay General Semiconductor - Diodes Division SMF51A-HM3-08
- Part No.:
- SMF51A-HM3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF51A-HM3-08.pdf
- Description:
- TVS DIODE 51VWM 82.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:6,157
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Product details
Overview
SMF51A-HM3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for high-energy transient suppression in DC power and signal lines. It features a 51 V standoff voltage (VRWM), 82.4 V maximum clamping voltage at 2.4 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is widely deployed in automotive infotainment power rails and industrial sensor interfaces.
For engineers reviewing the SMF51A-HM3-08 datasheet, SMF51A-HM3-08 pinout, SMF51A-HM3-08 application, or SMF51A-HM3-08 equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, capacitance impact on high-speed signal integrity, thermal resistance under sustained surge conditions, and AEC-Q101 qualification status for automotive use.
Technical Context
This device operates as a unidirectional avalanche diode, leveraging silicon planar technology to deliver fast response (<1 ns) and low incremental surge resistance. Its junction temperature rating of 175 °C and MSL level 1 moisture sensitivity support reflow-soldered deployment in harsh environments.
The SMF51A-HM3-08 is optimized for single-line protection with one protection path, rated for 51 V DC operating voltage and capable of clamping transients up to 82.4 V while passing 2.4 A (10/1000 μs). Its 151 pF capacitance at 0 V makes it suitable for medium-speed analog and power-line applications-not high-frequency data lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 51 V - Maximum continuous reverse voltage before significant leakage; sets upper limit for protected circuit operating voltage. |
| Clamping Voltage (VC) | 82.4 V max at IPPM = 2.4 A - Peak voltage seen by downstream IC during worst-case 10/1000 μs surge; defines protection margin. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustained transient energy handling capability without failure; validated per IEC 61000-4-5. |
| ESD Immunity | ±30 kV contact/air discharge - Meets highest IEC 61000-4-2 level; eliminates need for external ESD staging in many designs. |
| Capacitance | 151 pF at 0 V, 1 MHz - Low enough for 1–10 MHz analog/power signals; unsuitable for USB 2.0 or HDMI. |
| Operating Temp Range | −65 °C to +175 °C - Enables use in under-hood automotive, industrial motor drives, and outdoor power systems. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including HBM >8 kV and high-temp life testing. |
Pinout & Package
The SMF51A-HM3-08 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), 3.9 mm × 1.9 mm footprint, cathode-bar marked, compatible with SOD-123W layout. Mold compound is UL 94 V-0 rated; soldering supports peak temperatures up to 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to the line being protected (e.g., 51 V supply rail); conducts during positive transients when referenced to cathode. |
| Cathode | Ground/Reference side | Connected to system ground or low-impedance return; defines unidirectional conduction path and clamping reference point. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise fast response | Sub-nanosecond turn-on enables clamping before sensitive ICs experience overvoltage stress. |
| 200 W peak pulse power | Handles repetitive surges in industrial power supplies without degradation under defined duty cycle (0.01 %). |
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS power domains. |
| Wave and reflow solderable | Compatible with standard SMT assembly processes; no special handling required beyond MSL level 1 guidelines. |
| Low incremental surge resistance | Minimizes voltage overshoot during high-di/dt events, improving clamping precision versus higher-Rsurge alternatives. |
Applications
| Automotive Infotainment Power Rail | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 5V–48V power inputs to head unit MCUs and display drivers against load dump and ESD events. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between input connector and DC/DC converter input. Use Value: Clamps 51 V rail surges to ≤82.4 V, preserving downstream regulator and MCU VDD integrity without adding series impedance. | Use Scenario: Shielding 4–20 mA loop-powered sensor outputs from field-induced transients and connector ESD. IC Role / Device Role / Timing Role: Standoff-clamp protector on analog output line, grounded to local sensor PCB return. Use Value: 151 pF capacitance avoids signal distortion in <100 kHz analog loops; ±30 kV ESD rating prevents latch-up during maintenance. |
| Telecom Power Interface | Motor Drive Control Board |
Use Scenario: Safeguarding PoE-powered Ethernet switch ports against lightning-induced surges on 48 V bias lines. IC Role / Device Role / Timing Role: Primary-level TVS on midspan injector output, upstream of isolation and regulation stages. Use Value: 200 W pulse rating absorbs IEC 61000-4-5 Level 3 surges; 175 °C TJ rating ensures stability near hot-switching FETs. | Use Scenario: Protecting gate driver supply rails in BLDC inverters exposed to back-EMF spikes and ESD during service. IC Role / Device Role / Timing Role: Clamp diode on 12–24 V logic supply feeding isolated gate drivers. Use Value: 82.4 V clamping prevents driver IC overvoltage; AEC-Q101 qualification supports functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD and surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-E3/5A (Vishay) | Same 51 V VRWM and 82.4 V VC, but SMA (DO-214AC) package (4.5 mm × 2.7 mm); 2x footprint area; RthJA = 120 K/W vs. 180 K/W. | Higher power dissipation margin in space-constrained layouts where thermal pad access is limited. | Select SMAJ51A-E3/5A if board layout allows larger footprint and thermal performance is prioritized over profile height. |
| TPSMD51A (Texas Instruments) | 51 V VRWM, 87 V VC at 2.2 A; 165 pF capacitance; AEC-Q101 qualified; same DO-219AB package outline. | Slightly higher clamping voltage reduces protection margin; higher capacitance limits use in faster analog paths. | Choose TPSMD51A only if Vishay stock is constrained and design margin permits +4.6 V clamping rise and +14 pF added load. |
Compared with SMF51A-HM3-08, SMAJ51A-E3/5A offers better thermal performance in less thermally demanding layouts, while TPSMD51A trades clamping precision and capacitance for second-source availability-neither is pin-compatible due to differing marking schemes and test-condition tolerances.
Availability
SMF51A-HM3-08 is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor signal conditioning, and telecom power interface designs requiring stable component supply across extended production lifecycles.
Supply support for SMF51A-HM3-08 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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets compact, high-power ESD/surge protection in space-limited applications-designed specifically for AEC-Q101-compliant automotive subsystems and ruggedized industrial interfaces.
FAQ
What is the clamping voltage of the SMF51A-HM3-08 under a 10/1000 μs surge?
The SMF51A-HM3-08 has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current of 2.4 A using a 10/1000 μs waveform. This value is measured at the device terminals under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMF51A-HM3-08 maintains this clamping performance across its full operating temperature range.
Is the SMF51A-HM3-08 AEC-Q101 qualified?
Yes, the SMF51A-HM3-08 is AEC-Q101 qualified, meeting requirements for human body model (HBM) Class H3B (>8 kV) and robustness across temperature cycling, humidity, and high-temperature operating life tests. This qualification confirms suitability for automotive applications including powertrain, chassis, and infotainment systems. The SMF51A-HM3-08 carries full AEC-Q101 documentation per Vishay's Rev. 2.4 datasheet (Document Number: 85881).
What package type does the SMF51A-HM3-08 use, and what are its key mechanical dimensions?
The SMF51A-HM3-08 uses the DO-219AB (SMF) package: 3.9 mm length × 1.9 mm width × 1.08 mm maximum height, with cathode bar marking and SOD-123W-compatible footprint. Its low-profile design enables placement beneath connectors and in tight spacing constraints. The SMF51A-HM3-08 also complies with MSL level 1 and supports peak reflow temperatures up to 260 °C.
How does the capacitance of the SMF51A-HM3-08 affect its suitability for signal-line protection?
The SMF51A-HM3-08 exhibits 151 pF typical capacitance at 0 V and 1 MHz, making it appropriate for DC power rails and low-to-medium frequency analog signals (e.g., 4–20 mA loops, CAN FD power lines, or sensor bias voltages), but unsuitable for high-speed digital interfaces like USB 2.0 or HDMI. Its capacitance contributes minimal loading on protected nodes below ~10 MHz. The SMF51A-HM3-08 is not intended for data-line ESD protection where sub-5 pF is required.
What is the maximum peak pulse power rating for the SMF51A-HM3-08, and under which waveform is it specified?
The SMF51A-HM3-08 is rated for 200 W peak pulse power under the 10/1000 μs double-exponential waveform, per IEC 61000-4-5. It also supports 1000 W under the shorter 8/20 μs waveform. These ratings reflect non-repetitive surge capability at Tamb = 25 °C on a standard epoxy-glass PCB with 3 mm × 3 mm copper pads. Derating applies at elevated ambient temperatures or reduced copper area. The SMF51A-HM3-08 must be applied within these limits to ensure long-term reliability.
SMF51A-HM3-08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-219AB
- Series:
- eSMP®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 2.4A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 151pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF51A-HM3-08 FAQ
1.How can I place an order for SMF51A-HM3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF51A-HM3-08 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 SMF51A-HM3-08 reliable?
The price and inventory of SMF51A-HM3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF51A-HM3-08 is usually 5 days.
3.What payment methods are accepted for SMF51A-HM3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF51A-HM3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF51A-HM3-08?
SMF51A-HM3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF51A-HM3-08 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 SMF51A-HM3-08?
For technical support, including SMF51A-HM3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF51A-HM3-08 requirements.
6.How does Aetrix verify that SMF51A-HM3-08 is sourced from the original manufacturer or authorized distributors?
All SMF51A-HM3-08 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 SMF51A-HM3-08 meets industry standards.
7.What is the process for return or replacement of SMF51A-HM3-08?
All SMF51A-HM3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF51A-HM3-08, 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 SMF51A-HM3-08 part is unused and in its original packaging.
Return procedure for SMF51A-HM3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF51A-HM3-08 Tags
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