My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ51AHM3_A/I
- Part No.:
- SMBJ51AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51AHM3_A/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,159
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ51AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping fast-rising ESD and surge 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 a 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and automotive control modules.
For engineers reviewing the SMBJ51AHM3_A/I datasheet, SMBJ51AHM3_A/I pinout, SMBJ51AHM3_A/I application, or SMBJ51AHM3_A/I equivalent, this device is evaluated for robust overvoltage protection in DC power rails, I/O line conditioning, and AEC-Q101-compliant automotive subsystems where low clamping voltage, fast response (<1 ns), and halogen-free RoHS compliance are required.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response to transients. Its 100 °C/W junction-to-ambient thermal resistance and 20 °C/W junction-to-lead resistance support operation up to 150 °C junction temperature under pulsed conditions.
The SMBJ51AHM3_A/I is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), exhibits ≤1.0 µA reverse leakage at 51 V, and maintains stable VBR temperature coefficient of +0.104 %/°C - enabling predictable clamping behavior across automotive and industrial ambient ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 51 V - maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 56.7–62.7 V at 1 mA - guaranteed avalanche initiation range; ensures reliable turn-on during overvoltage events |
| VC (Clamping Voltage) | 82.4 V at 7.3 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case surge; limits stress on downstream components |
| PPPM (Peak Pulse Power) | 600 W - energy-handling capacity for standardized 10/1000 µs surge; validates suitability for IEC 61000-4-5 Level 3/4 tests |
| IPPM (Peak Pulse Current) | 7.3 A - maximum transient current it can shunt without failure; directly tied to PCB trace width and layout robustness |
| TJ max. | 150 °C - maximum allowable junction temperature; supports operation in under-hood automotive and high-ambient industrial environments |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; optimized for automated placement and reflow |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity with cathode band marking. Matte tin-plated leads, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during reverse-biased transient clamping |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 51 V rail); avalanche breakdown occurs between cathode and anode when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates immunity to IEC 61000-4-5 combination wave surges up to 1 kV/500 A in typical layouts |
| Halogen-free, RoHS-compliant (HM3 suffix) | Meets IPC-1752A material declaration requirements and automotive ELV directive for sustainable manufacturing |
| AEC-Q101 qualified | Qualified for automotive powertrain and body electronics per stress test requirements including HTGB, HTRB, and TCT |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), reducing risk of latch-up in protected ICs |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; supports high-yield assembly in volume production |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 5V–24V sensor supply lines (e.g., Hall-effect, temperature) from load dump and inductive switching spikes in vehicle BCMs. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between sensor VCC and ground, triggered within <1 ns to limit voltage to ≤82.4 V during 100 V/10 ms load dump events. Use Value: Prevents permanent damage to microcontroller GPIOs and analog front-end circuits while maintaining AEC-Q100 Grade 2 temperature operation. |
Use Scenario: Shields 24 V DC digital input channels on programmable logic controller I/O cards from field-wiring induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted at connector entry point, clamping transients before signal conditioning op-amps and optocouplers. Use Value: Enables >100,000 surge cycles without degradation, meeting IEC 61000-4-4 Level 4 (4 kV EFT) and IEC 61000-4-5 Level 3 (2 kV surge) compliance. |
| Telecom Power Supply Output Rail | Consumer Appliance Motor Driver Board |
Use Scenario: Safeguards isolated 48 V DC output of telecom AC/DC converters against backfeed surges from hot-plug modules and lightning-induced coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side output, coordinated with upstream MOVs and downstream polymer PTCs. Use Value: Maintains <1 µA leakage at 48 V, minimizing standby power loss while delivering 600 W surge handling without thermal runaway. |
Use Scenario: Protects gate drivers and bootstrap circuits in BLDC motor inverters from shoot-through-induced voltage spikes and flyback energy from inductive loads. IC Role / Device Role / Timing Role: Fast-response TVS placed across high-side MOSFET source-drain to clamp VDS overshoot during commutation transitions. Use Value: Limits VDS to 82.4 V during 7.3 A transient, preventing avalanche failure of 100 V-rated Si MOSFETs in compact, thermally constrained layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51AHE3_A/I | Same electrical specs, but RoHS-compliant (not halogen-free); no AEC-Q101 qualification | Restricted to commercial-grade industrial and consumer applications; not approved for automotive use | Select when halogen-free content is not mandated and AEC-Q101 is unnecessary |
| SMBJ51A-M3/5B | Identical TVS parameters; packaged in 13" tape-and-reel (3200 pcs), HM3 suffix indicates halogen-free but lacks AEC-Q101 certification | Intended for high-volume commercial production with extended reel logistics; no automotive qualification documentation | Choose for cost-sensitive, non-automotive volume builds requiring halogen-free compliance only |
Compared with SMBJ51AHM3_A/I, the HE3 variant omits AEC-Q101 validation and halogen-free assurance, while the M3/5B version shares halogen-free status but lacks automotive qualification - making SMBJ51AHM3_A/I the sole option certified for both AEC-Q101 and halogen-free compliance in a single part number.
Availability
SMBJ51AHM3_A/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and telecom power supply output clamping requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMBJ51AHM3_A/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, power efficiency, and automotive-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where consistent clamping performance and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ51AHM3_A/I at its rated peak pulse current?
The SMBJ51AHM3_A/I has a maximum clamping voltage (VC) of 82.4 V at 7.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - a key parameter for ensuring downstream ICs remain within absolute maximum ratings. The SMBJ51AHM3_A/I achieves this with low dynamic impedance and minimal overshoot due to its optimized silicon junction design.
Is SMBJ51AHM3_A/I qualified for automotive applications?
Yes, SMBJ51AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix with "H" denoting AEC-Q101 qualification). It undergoes stress testing including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT) per AEC-Q101 Rev D. This makes SMBJ51AHM3_A/I suitable for automotive body electronics, infotainment power rails, and ADAS sensor interface protection where reliability under thermal and electrical stress is mandatory.
What does the "HM3" suffix indicate in SMBJ51AHM3_A/I?
The "HM3" suffix in SMBJ51AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. "H" specifies AEC-Q101 compliance, "M" indicates halogen-free molding compound and terminations, and "3" confirms RoHS compliance per EU Directive 2011/65/EU. This triple designation distinguishes it from E3 (RoHS only) and HE3 (RoHS + AEC-Q101, but not halogen-free) variants - ensuring full alignment with automotive ELV and sustainability requirements.
How does SMBJ51AHM3_A/I differ from bidirectional TVS diodes like SMBJ51CA?
SMBJ51AHM3_A/I is unidirectional and functions as a polarity-sensitive clamp - conducting only during reverse-bias overvoltage events, with the cathode band indicating the high-side connection. In contrast, SMBJ51CA is bidirectional and clamps symmetrically in both polarities, making it suitable for AC lines or differential data paths. SMBJ51AHM3_A/I offers lower leakage (<1 µA at 51 V) and higher surge current capability in DC applications, whereas SMBJ51CA exhibits matched VBR in both directions but higher capacitance and leakage in DC bias conditions.
What is the thermal resistance specification for SMBJ51AHM3_A/I?
SMBJ51AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, and a junction-to-lead resistance (RθJL) of 20 °C/W. These values define power derating above 25 °C ambient and inform heatsinking decisions - for example, at 70 °C ambient, its 5.0 W steady-state power dissipation must be reduced to ~3.5 W to maintain TJ ≤ 150 °C. The SMBJ51AHM3_A/I's low RθJL enables effective heat transfer through solder joints into PCB copper.
SMBJ51AHM3_A/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:
- Obsolete
- 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_A/I FAQ
1.How can I place an order for SMBJ51AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51AHM3_A/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_A/I reliable?
The price and inventory of SMBJ51AHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ51AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51AHM3_A/I?
SMBJ51AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51AHM3_A/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_A/I?
For technical support, including SMBJ51AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ51AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ51AHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ51AHM3_A/I?
All SMBJ51AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51AHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for SMBJ51AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51AHM3_A/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
