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Vishay General Semiconductor - Diodes Division SMBJ51A-M3/5B
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- Part No.:
- SMBJ51A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51A-M3/5B.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,772
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Product details
Overview
SMBJ51A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 51 V stand-off voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 82.4 V maximum clamping voltage (VC) at 7.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, microcontrollers, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ51A-M3/5B datasheet, SMBJ51A-M3/5B pinout, SMBJ51A-M3/5B application, or SMBJ51A-M3/5B equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, halogen-free RoHS compliance status, and direct alternatives for ESD/lightning transient protection in 24–48 V DC systems.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its VBR range (56.7–62.7 V). Its low incremental surge resistance ensures stable clamping during repetitive 10/1000 µs transients up to 0.01% duty cycle, with thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead).
The device uses a glass-passivated silicon junction, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and supports automated SMT placement. Polarity is marked by a cathode band; it is not rated for bidirectional operation and exhibits no clamping in forward conduction beyond its specified 3.5 V max forward voltage at 50 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC bias margin for 48 V rail protection. |
| VBR @ IT = 1 mA | 56.7–62.7 V - Breakdown threshold range; ensures reliable turn-on within ±5.5% tolerance at test current. |
| VC @ IPPM = 7.3 A | 82.4 V - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to ≤82.4 V at rated peak current. |
| PPPM | 600 W - Peak pulse power handling capability; sustains single or repetitive surges without failure under defined waveform. |
| IFSM | 100 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports inrush current immunity in DC input stages. |
| TJ max | 150 °C - Maximum junction temperature; enables operation in sealed enclosures or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with IPC-7351B land patterns. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity with cathode band marking. Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events up to 50 A. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 48 V supply rail); initiates avalanche breakdown when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without degradation in standard PCB layouts. |
| 82.4 V clamping voltage at 7.3 A | Provides ≤30% overvoltage margin above 51 V nominal rail, ensuring safe operation of 60 V-rated MOSFETs and gate drivers. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive and industrial environmental compliance requirements including JEDEC J-STD-20 and JESD201 Class 2 whisker resistance. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile use (peak 260 °C) without baking or special handling. |
| Low leakage: ≤1 µA at 51 V | Minimizes standby power loss in always-on systems such as remote sensors and battery-backed controllers. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers from inductive kickback and EFT bursts. IC Role / Device Role / Timing Role: Unidirectional TVS placed between field input and optocoupler/signal conditioner input. Use Value: Limits transient voltage to ≤82.4 V, preventing latch-up or damage to 3.3 V/5 V logic interface ICs downstream. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs against load dump and ISO 7637-2 pulses in body electronics. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 12 V supply rail feeding BCM sub-circuits. Use Value: Withstands 100 A surge (8.3 ms) and clamps 51 V rail transients to 82.4 V, preserving 60 V-rated CAN/LIN transceivers. |
| Telecom Power Supply Input | Motor Drive Gate Driver Protection |
|
Use Scenario: Front-end surge suppression on 48 V telecom rectifier outputs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converters and hot-swap controllers. Use Value: Delivers 600 W pulse power handling and 82.4 V clamping to meet GR-1089-CORE Level 3 requirements without series impedance. |
Use Scenario: Protecting high-side N-channel MOSFET gate drivers from Miller-induced voltage spikes during switching transitions. IC Role / Device Role / Timing Role: Clamp diode connected between gate and source to suppress dv/dt-induced overshoot. Use Value: Fast response (<1 ps) and low clamping voltage ensure gate oxide integrity under 100 V/ns edge rates in 400 V motor drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A-E3/5B | Same electrical specs, but RoHS-compliant with lead finish containing lead (Pb); not halogen-free. | Approved for commercial-grade non-automotive designs where halogen-free requirement is waived. | Select when cost sensitivity outweighs halogen-free mandate and Pb-containing finish is acceptable per regional regulations. |
| SMBJ51AHM3_B/I | AEC-Q101 qualified version with identical VWM, VBR, and VC; same SMB package, halogen-free, but shipped in 13" reel (3200 pcs). | Required for automotive ECUs needing full qualification traceability and extended temperature validation (-55 °C to +150 °C). | Choose for Tier-1 automotive programs requiring AEC-Q101 documentation, PPAP support, and long-term supply assurance. |
Compared with SMBJ51A-M3/5B, the E3 variant offers identical clamping performance at lower cost but lacks halogen-free certification, while the HM3_B/I adds AEC-Q101 qualification and larger reel packaging - enabling drop-in use in automotive designs but requiring procurement alignment with volume and traceability needs.
Availability
SMBJ51A-M3/5B is available at Aetrix Electronics and suitable for industrial PLCs, telecom power supplies, automotive body control modules, and motor drive gate driver circuits requiring stable component supply with halogen-free compliance and MSL Level 1 reflow compatibility.
Supply support for SMBJ51A-M3/5B 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 is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and ruggedized packaging.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and telecom infrastructure where consistent clamping, low leakage, and assembly robustness are critical.
FAQ
What is the maximum clamping voltage of SMBJ51A-M3/5B under a 10/1000 µs surge?
The SMBJ51A-M3/5B has a maximum clamping voltage (VC) of 82.4 V at 7.3 A peak pulse current with a 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMBJ51A-M3/5B maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) when mounted per recommended pad layout.
Is SMBJ51A-M3/5B suitable for bidirectional signal line protection?
No, SMBJ51A-M3/5B is a unidirectional TVS diode and must not be used on bidirectional lines such as RS-485 or USB D+/D− without external circuitry. Its cathode-band marking indicates polarity-sensitive placement, and it provides no clamping in forward conduction beyond 3.5 V at 50 A. For bidirectional protection, select the SMBJ51CA variant instead. The SMBJ51A-M3/5B is intended only for DC rails or unidirectional signal paths.
Does SMBJ51A-M3/5B meet AEC-Q101 qualification?
No, SMBJ51A-M3/5B is not AEC-Q101 qualified. It is a commercial-grade, halogen-free, RoHS-compliant part (M3 suffix) rated for -55 °C to +150 °C operation but lacking the extended reliability testing required for automotive qualification. For AEC-Q101 compliance, specify SMBJ51AHM3_B/I or SMBJ51AHE3_B/I - both carry full qualification documentation and are designated for automotive ECUs and body electronics.
What is the thermal resistance of SMBJ51A-M3/5B, and how does it affect PCB layout?
The SMBJ51A-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W. To maintain safe operation at full 5.0 W steady-state dissipation, PCB copper pads must follow Vishay's minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal recommendation. Reducing pad area increases thermal impedance and risks exceeding the 150 °C TJ limit during repetitive surges. The SMBJ51A-M3/5B relies on thermal conduction through leads rather than case surface.
Can SMBJ51A-M3/5B replace SMAJ51A in an existing design?
No, SMBJ51A-M3/5B is not a direct replacement for SMAJ51A due to package and power differences. SMAJ51A uses the smaller SMA (DO-214AC) package with 400 W PPPM, while SMBJ51A-M3/5B uses SMB (DO-214AA) with 600 W rating and larger pad layout. Substituting requires verifying PCB land pattern compatibility, thermal relief, and surge margin. The SMBJ51A-M3/5B offers higher energy handling but occupies more board space - redesign verification is mandatory before substitution.
SMBJ51A-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- 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):
- 7.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ51A-M3/5B FAQ
1.How can I place an order for SMBJ51A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51A-M3/5B 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 SMBJ51A-M3/5B reliable?
The price and inventory of SMBJ51A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ51A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51A-M3/5B?
SMBJ51A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51A-M3/5B 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 SMBJ51A-M3/5B?
For technical support, including SMBJ51A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51A-M3/5B requirements.
6.How does Aetrix verify that SMBJ51A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ51A-M3/5B 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 SMBJ51A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ51A-M3/5B?
All SMBJ51A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51A-M3/5B, 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 SMBJ51A-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ51A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51A-M3/5B Tags
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