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Vishay General Semiconductor - Diodes Division SMBJ51AHM3_B/I
- Part No.:
- SMBJ51AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51AHM3_B/I.pdf
- Description:
- 600W,51V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,703
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Product details
Overview
SMBJ51AHM3_B/I 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 DC power rails 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 - deployed in automotive ECUs, industrial sensor interfaces, and telecom power supplies.
For engineers reviewing the SMBJ51AHM3_B/I datasheet, SMBJ51AHM3_B/I pinout, SMBJ51AHM3_B/I application, or SMBJ51AHM3_B/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), halogen-free RoHS compliance, and real-world clamping performance data to support surge protection design validation and BOM selection.
Technical Context
This unidirectional TVS diode operates as a fast-acting shunt clamp, responding in <1 ps to transients exceeding its VWM threshold and diverting surge energy to ground before downstream ICs are damaged. Its glass-passivated junction ensures stable leakage (<1 µA at 51 V) and low incremental surge resistance, critical for repeatable clamping under repetitive ESD or load-switching events.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 (peak reflow ≤260 °C). Its SMB package supports automated placement and provides 600 W pulse handling on standard 0.2" × 0.2" copper pads - making it suitable for high-reliability board-level protection without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V systems. |
| VBR (min/max) | 56.7 V / 62.7 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on across production lot and temperature. |
| VC @ IPPM | 82.4 V at 7.3 A - Clamping voltage during 10/1000 µs surge; limits stress on protected 5 V–36 V logic or analog circuitry. |
| PPPM | 600 W - Peak pulse power handling capability; sustains single or low-duty-cycle transients per ISO 7637-2 Pulse 1/2/5a. |
| IFSM | 100 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports inrush or fault-current limiting in power supply inputs. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard PCB layout; enables thermal budgeting without added copper. |
| Package | SMB (DO-214AA) - Surface-mount outline with cathode band marking; compatible with IPC-7351B footprint and pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to system ground or return path; completes clamping loop during transient event. |
| Cathode | High-side connection point | Connected to protected line (e.g., 48 V rail or CAN_H); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-20E and EU Directive 2011/65/EU; no brominated flame retardants or antimony trioxide. |
| 600 W peak pulse power | Handles ISO 16750-2 load dump surges up to 120 V/100 ms and ISO 7637-2 Pulse 5a without degradation. |
| Fast response time & low VC | Clamps within picoseconds to limit voltage overshoot below 83 V - protecting 75 V-rated MOSFETs and 5 V microcontrollers. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (260 °C peak) without baking or special handling. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump transients and alternator ripple. IC Role / Device Role / Timing Role: Shunt-clamp TVS placed between power input and ground, activated only during overvoltage events. Use Value: Limits transient voltage to ≤82.4 V, preventing damage to buck converters and CAN transceivers powered from same rail. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional clamp on sensor VOUT line, referenced to system ground. Use Value: Suppresses EFT bursts (IEC 61000-4-4) and cable discharge events while maintaining signal integrity below 1 mV offset shift. |
| Telecom DC Power Input Protection | Consumer Device USB Power Path Protection |
|
Use Scenario: Front-end protection for PoE-powered switches and base station RF modules operating from -48 V DC. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input bulk capacitor node, coordinated with upstream fuse. Use Value: Absorbs 600 W surges without thermal runaway, preserving hold-up time and enabling Class I lightning immunity (IEC 61000-4-5). |
Use Scenario: Overvoltage guard on USB-C VBUS line in portable speakers and smart displays. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between VBUS and chassis ground, sized for 5–20 V operation. Use Value: Clamps hot-plug spikes and adapter faults to <85 V, ensuring USB PD controller ICs remain within absolute maximum ratings. |
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/I | Same electrical specs and SMB package; RoHS-compliant but not halogen-free. | Acceptable where halogen content is unrestricted (e.g., non-automotive commercial gear). | Select when cost optimization is prioritized over halogen-free requirement. |
| SMBJ51AHM3_B/H | Identical specs and halogen-free construction; differs only in reel size (750 vs. 3200 units) and tape width (7″ vs. 13″). | Used in low-volume prototyping or small-batch manufacturing with smaller feeder compatibility. | Select for engineering samples or pilot runs requiring shorter reels. |
Compared with SMBJ51AHM3_B/I, the HE3 variant lacks halogen-free certification but offers identical clamping and thermal behavior, while the HM3_B/H shares all functional attributes but ships in smaller reels - making SMBJ51AHM3_B/I optimal for high-volume AEC-Q101-compliant automotive production with full environmental compliance.
Availability
SMBJ51AHM3_B/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, and telecom power supplies requiring stable component supply, AEC-Q101 qualification, halogen-free compliance, and 600 W transient immunity.
Supply support for SMBJ51AHM3_B/I 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and automotive-grade validation.
The SMBJ series is engineered for board-level transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, thermal stability, and long-term surge endurance are mandatory.
FAQ
What is the clamping voltage of SMBJ51AHM3_B/I at its rated peak pulse current?
The SMBJ51AHM3_B/I has a maximum clamping voltage (VC) of 82.4 V at 7.3 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ51AHM3_B/I maintains this clamping performance across its specified operating temperature range (-55 °C to +150 °C) and is validated per AEC-Q101 stress testing.
Is SMBJ51AHM3_B/I qualified for automotive use?
Yes, SMBJ51AHM3_B/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88392 (Revision 09-Jan-2024). It undergoes stress testing for high-temperature reverse bias, temperature cycling, and humidity bias to ensure reliability in engine compartments and ADAS modules. The SMBJ51AHM3_B/I is designated for automotive applications requiring halogen-free and RoHS-compliant components.
What does the "HM3" suffix indicate in SMBJ51AHM3_B/I?
The "HM3" suffix in SMBJ51AHM3_B/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering nomenclature, "H" indicates AEC-Q101 qualification, "M3" specifies halogen-free and RoHS-compliant materials, and "B/I" identifies the packaging format: 13″ tape-and-reel with 3200 units per reel. This distinguishes SMBJ51AHM3_B/I from commercial-grade variants like SMBJ51A-E3.
Can SMBJ51AHM3_B/I be used in bidirectional configurations?
No, SMBJ51AHM3_B/I is a unidirectional TVS diode, identifiable by its cathode band marking and specified VBR/VWM values for reverse-biased operation only. For bidirectional protection, Vishay offers the SMBJ51CA variant (with "CA" suffix), which exhibits symmetrical clamping in both polarities. Using SMBJ51AHM3_B/I in bidirectional circuits would leave positive-going transients unprotected and may cause forward conduction failure.
What is the thermal resistance of SMBJ51AHM3_B/I, and how does it affect PCB layout?
The SMBJ51AHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 board thickness and no additional heatsinking. To maintain TJ ≤150 °C during repetitive surges, designers must limit average power dissipation and avoid excessive copper isolation - the SMBJ51AHM3_B/I does not require thermal vias but benefits from shared ground plane area.
SMBJ51AHM3_B/I 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:
- 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/I FAQ
1.How can I place an order for SMBJ51AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51AHM3_B/I 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/I reliable?
The price and inventory of SMBJ51AHM3_B/I 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/I is usually 5 days.
3.What payment methods are accepted for SMBJ51AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51AHM3_B/I?
SMBJ51AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51AHM3_B/I 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/I?
For technical support, including SMBJ51AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ51AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ51AHM3_B/I 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/I meets industry standards.
7.What is the process for return or replacement of SMBJ51AHM3_B/I?
All SMBJ51AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51AHM3_B/I, 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/I part is unused and in its original packaging.
Return procedure for SMBJ51AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51AHM3_B/I Tags
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