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Vishay General Semiconductor - Diodes Division SMBJ51AHM3_B/H
- Part No.:
- SMBJ51AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51AHM3_B/H.pdf
- Description:
- 600W,51V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,795
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Product details
Overview
SMBJ51AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V stand-off voltage (VWM), 600 W peak pulse power rating (10/1000 μs), clamping voltage of 82.4 V at 7.3 A peak pulse current, and operates across -55 °C to +150 °C junction temperature - deployed on power rails and signal lines in industrial motor drives.
For engineers reviewing the SMBJ51AHM3_B/H datasheet, SMBJ51AHM3_B/H pinout, SMBJ51AHM3_B/H application, or SMBJ51AHM3_B/H equivalent, this page delivers verified electrical parameters, thermal behavior under surge conditions, AEC-Q101 qualification status, and real-world design implications for ESD and lightning-induced transient suppression in automotive and industrial systems.
Technical Context
This TVS diode operates as a unidirectional clamping device with a breakdown voltage range of 56.7 V to 62.7 V at 1 mA test current, enabling precise overvoltage threshold control. Its low incremental surge resistance ensures minimal voltage overshoot during fast transients, while the glass-passivated junction guarantees stable performance under repetitive surge stress.
The SMBJ51AHM3_B/H is halogen-free and RoHS-compliant, qualified to AEC-Q101 for automotive use, and rated for MSL level 1 per J-STD-020 with 260 °C lead-free reflow compatibility. Its thermal resistance (junction-to-lead) is 20 °C/W, supporting reliable power dissipation in compact PCB layouts without external heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin for protected circuitry |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - guaranteed breakdown window ensuring consistent turn-on across production lots and temperature |
| VC @ IPPM | 82.4 V at 7.3 A - clamped voltage during 10/1000 μs surge; determines worst-case stress on downstream ICs or MOSFETs |
| PPPM | 600 W - peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out |
| ID @ VWM | 1.0 μA - ultra-low reverse leakage at rated stand-off voltage; avoids unnecessary power drain in battery-powered systems |
| TJ max | +150 °C - extended junction temperature rating enables deployment in under-hood automotive or high-ambient industrial environments |
| RθJL | 20 °C/W - low junction-to-lead thermal resistance allows effective heat transfer to PCB copper pads without thermal vias |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band on case end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path during positive transients |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 48 V rail or CAN_H); conducts surge current to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables compliance with IEC 61000-4-5 surge immunity standards up to Level 4 without derating in standard PCB layouts |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per AEC specification |
| Glass passivated chip junction | Provides stable VBR tolerance and low leakage over lifetime, even under high-humidity or high-vibration conditions |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free assembly without moisture sensitivity concerns or pre-bake requirements |
| Low clamping ratio (VC/VBR ≈ 1.33) | Minimizes overvoltage exposure to protected devices - critical for safeguarding 60 V-rated MOSFETs or 5V/3.3V logic interfaces |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O against inductive kickback from 24 V solenoid coils and relay switching. IC Role / Device Role / Timing Role: Unidirectional TVS placed between MCU GPIO and load interface to clamp negative transients below -0.7 V and positive surges above 51 V. Use Value: Prevents latch-up and permanent damage to 3.3 V I/O pins while maintaining <1.0 μA leakage at nominal 24 V rail voltage. |
Use Scenario: Surge suppression on LIN bus lines and power supply inputs in BCMs exposed to load dump and jump-start events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail and LIN transceiver VCC line, absorbing 600 W pulses without degradation. Use Value: Enables AEC-Q101-compliant system-level ISO 7637-2 Pulse 5a/b immunity without additional filtering or layout complexity. |
| Telecom Power Supplies | Consumer Appliance Control Boards |
|
Use Scenario: Input-stage protection for 48 V DC-DC converters in PoE-powered equipment subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on secondary-side 48 V output, coordinated with upstream MOVs to limit let-through energy. Use Value: Clamps to 82.4 V within nanoseconds, limiting stress on downstream buck controller ICs rated for 100 V absolute maximum. |
Use Scenario: Overvoltage safeguard for microcontroller reset lines and sensor analog inputs in washing machine main control boards. IC Role / Device Role / Timing Role: Low-leakage TVS on 5 V analog sensor rail, preventing false triggering or ADC saturation during ESD events. Use Value: Delivers <1.0 μA leakage at 5 V and sub-1 ns response time - preserving signal integrity and battery life in always-on standby modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51AHE3_B/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (non-AEC-Q101 qualified) | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated | Select when cost sensitivity outweighs automotive reliability requirements and no temperature cycling or humidity bias validation is needed |
| SMAJ51A-M3/5B | Lower 400 W PPPM rating, SMA (DO-214AC) package with higher RθJA (140 °C/W), same VWM and VC | Reduced surge handling and inferior thermal performance; requires larger copper area or derating in high-temp environments | Choose only if legacy SMA footprint reuse is mandatory and surge threat level is limited to IEC 61000-4-2 ESD or low-energy transients |
Compared with SMBJ51AHM3_B/H, the SMBJ51AHE3_B/H offers identical clamping and leakage but omits AEC-Q101 validation, while the SMAJ51A-M3/5B trades 33 % lower surge power and poorer thermal resistance for footprint compatibility - neither is pin-compatible nor drop-in; both require layout or derating adjustments.
Availability
SMBJ51AHM3_B/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power supplies, and consumer appliance control boards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ51AHM3_B/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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, AEC-Q101 compliance, and precise clamping performance are mandatory.
FAQ
What is the clamping voltage of SMBJ51AHM3_B/H at its rated peak pulse current?
The SMBJ51AHM3_B/H has a maximum clamping voltage (VC) of 82.4 V at 7.3 A peak pulse current (IPPM), measured under the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring downstream components remain within their absolute maximum ratings. The SMBJ51AHM3_B/H maintains this clamping performance across its full operating temperature range.
Is SMBJ51AHM3_B/H qualified for automotive applications?
Yes, SMBJ51AHM3_B/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the 88392 datasheet. This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - validating its suitability for under-hood and chassis-mounted automotive electronics where reliability under thermal and mechanical stress is essential. The SMBJ51AHM3_B/H meets these requirements without derating.
What does the "HM3" suffix indicate in SMBJ51AHM3_B/H?
The "HM3" suffix in SMBJ51AHM3_B/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from commercial-grade variants like "E3" or "M3". It confirms compliance with JEDEC J-STD-020 MSL Level 1, matte tin plating per J-STD-002, and whisker resistance per JESD 201 Class 2. The "B/H" portion specifies packaging: 7″ tape-and-reel, 750 units per reel. This full suffix ensures traceable, automotive-grade material content and assembly readiness.
How does SMBJ51AHM3_B/H compare to bidirectional TVS diodes like SMBJ51CA?
SMBJ51AHM3_B/H is unidirectional and intended for DC-biased lines where only positive-going transients require suppression - such as 51 V power rails or signal lines referenced to ground. In contrast, SMBJ51CA is bidirectional and suited for AC-coupled or floating lines like data buses. The SMBJ51AHM3_B/H provides lower leakage (<1.0 μA at 51 V) and avoids the doubled ID limit applicable to low-VWM bidirectional types, making it preferable for precision voltage rail protection where leakage current must be minimized.
What PCB layout considerations optimize thermal performance of SMBJ51AHM3_B/H?
To maximize thermal performance, mount SMBJ51AHM3_B/H on minimum recommended 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the datasheet. Use internal or external thermal vias beneath pads to connect to inner-layer or backside ground planes, reducing effective RθJA. Avoid narrow traces; ensure ≥0.5 mm trace width to each pad. These practices maintain junction temperature below 150 °C during repetitive 600 W surges and support reliable operation in enclosed industrial enclosures.
SMBJ51AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ51AHM3_B/H FAQ
1.How can I place an order for SMBJ51AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51AHM3_B/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 SMBJ51AHM3_B/H reliable?
The price and inventory of SMBJ51AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51AHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ51AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51AHM3_B/H?
SMBJ51AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51AHM3_B/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 SMBJ51AHM3_B/H?
For technical support, including SMBJ51AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51AHM3_B/H requirements.
6.How does Aetrix verify that SMBJ51AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ51AHM3_B/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 SMBJ51AHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ51AHM3_B/H?
All SMBJ51AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51AHM3_B/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 SMBJ51AHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ51AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51AHM3_B/H Tags
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