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Vishay General Semiconductor - Diodes Division SMBJ51AHM3/H
- Part No.:
- SMBJ51AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51AHM3/H.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,532
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Product details
Overview
SMBJ51AHM3/H 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), 600 W peak pulse power (10/1000 µs), 82.4 V maximum clamping voltage at 7.3 A peak pulse current, and operates across -55 °C to +150 °C junction temperature - deployed in automotive power rail protection and industrial sensor interface circuits.
For engineers reviewing the SMBJ51AHM3/H datasheet, SMBJ51AHM3/H pinout, SMBJ51AHM3/H application, or SMBJ51AHM3/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), clamping performance under standardized surge waveforms, and halogen-free RoHS-compliant sourcing details specific to the HM3 suffix.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 56.7–62.7 V breakdown range (VBR at 1 mA). Its low incremental surge resistance and fast response time ensure effective suppression of ESD and inductive switching transients without latch-up or degradation under repetitive 0.01% duty cycle surges.
Designed for surface-mount assembly on 5.0 mm × 5.0 mm copper pads, it meets MSL Level 1 per J-STD-020 with 260 °C peak reflow profile and supports automated placement. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - critical for automotive-grade reliability in engine control units and ADAS sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin in protected circuit. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - Verified breakdown threshold range; ensures consistent turn-on behavior across production lots and temperature. |
| VC @ IPPM | 82.4 V at 7.3 A - Measured clamping voltage during 10/1000 µs surge; determines worst-case overvoltage seen by downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability; enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| IPPM | 7.3 A - Peak surge current supported at rated clamping voltage; correlates directly with energy absorption (E ≈ ½ × VC × IPPM × tp). |
| TJ max | +150 °C - Maximum junction temperature rating; allows operation in under-hood automotive environments and high-power industrial enclosures. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard PCB pad layout; informs derating requirements above 25 °C ambient. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward-biased ESD events or fault conditions. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail or sensor output); avalanches into conduction when transient exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with ISO 7637-2 and IEC 61000-4-5 surge immunity requirements for automotive and industrial equipment. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including powertrain, body electronics, and ADAS sensors - includes HTOL, TC, and ESD testing. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20; eliminates brominated flame retardants for safer end-of-life processing. |
| Low-profile SMB package | 0.220" × 0.155" footprint with 0.096" height - fits dense PCB layouts while maintaining thermal performance via copper pad coupling. |
| Fast response time & low clamping ratio | Clamps within picoseconds; VC/VWM = 1.62 ensures minimal overvoltage stress on protected MOSFETs or microcontrollers. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to 35 V, 100 ms) and ISO 7637-2 Pulse 1 (−150 V, 2 Ω source) on 12 V battery-fed ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp negative-going spikes before they reach LDOs or MCU power pins. Use Value: Limits voltage excursion to ≤82.4 V during 7.3 A surge, preventing damage to 36 V-rated input stages and ensuring uninterrupted operation per ISO 16750-2. |
Use Scenario: Protecting analog outputs of pressure/temperature sensors in factory automation systems exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: TVS mounted at sensor connector entry point, shunting transients induced by nearby 24 V solenoid switching onto 0–10 V or 4–20 mA signal lines. Use Value: Clamps 10/1000 µs surges to 82.4 V while adding only 1.5 pF junction capacitance - preserves signal integrity up to 100 kHz bandwidth. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Stage |
|
Use Scenario: Guarding primary-side DC bus (e.g., 48 V telecom supply) against lightning-induced surges entering via Ethernet or PoE interfaces. IC Role / Device Role / Timing Role: First-line unidirectional suppressor upstream of DC-DC converter, coordinated with MOVs and gas discharge tubes for staged protection. Use Value: Absorbs 600 W transient energy without degradation, enabling system-level IEC 61000-4-5 Level 4 (4 kV line-earth) compliance with minimal board space. |
Use Scenario: Safeguarding AC-DC adapter input rectifier stage against mains-borne surges (e.g., IEC 61000-4-5 1.2/50 µs + 8/20 µs combination wave). IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor input, clamping overvoltage before it overstresses bridge rectifier or primary FET. Use Value: Withstands 100 A non-repetitive forward surge (IFSM) and maintains stable VBR drift <0.104 %/°C - ensures long-term reliability in cost-sensitive consumer designs. |
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/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (not AEC-Q101 qualified); uses standard tin plating without halogen-free constraint. | Lacks automotive qualification; suitable for industrial/commercial power supplies where AEC-Q101 is not mandated. | Select SMBJ51AHE3/H for cost-sensitive non-automotive designs requiring identical clamping performance without halogen-free or automotive validation. |
| SMAJ51A | Lower 400 W PPPM, same VWM/VC ratings, but in smaller SMA (DO-214AC) package with higher RθJA (140 °C/W). | Reduced surge margin and inferior thermal dissipation; limited to lower-energy transients or less demanding environments. | Choose SMAJ51A only when board space is constrained and surge threat level is below ISO 7637-2 Level III - not recommended for automotive or industrial mains-connected systems. |
Compared with SMBJ51AHE3/H and SMAJ51A, the SMBJ51AHM3/H uniquely combines AEC-Q101 qualification, halogen-free compliance, and full 600 W surge capability in the SMB footprint - making it the sole choice for automotive Tier-1 suppliers requiring traceable, validated TVS components for safety-critical subsystems.
Availability
SMBJ51AHM3/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and telecom line card surge hardening requiring stable component supply, long-term lifecycle assurance, and AEC-Q101 traceability.
Supply support for SMBJ51AHM3/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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was developed for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be rigorously controlled and validated.
FAQ
What is the clamping voltage of SMBJ51AHM3/H under a 10/1000 µs surge?
The SMBJ51AHM3/H 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 ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMBJ51AHM3/H qualified for automotive applications?
Yes, SMBJ51AHM3/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix and documentation in Vishay's datasheet (Document Number: 88392, Revision: 09-Jan-2024). This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD - validating its use in engine control modules, body controllers, and ADAS sensor assemblies.
What does the "HM3" suffix indicate for SMBJ51AHM3/H?
The "HM3" suffix on SMBJ51AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., E3) and confirms compliance with JEDEC J-STD-20 reflow profiles, MSL Level 1 handling, and whisker resistance per JESD 201 Class 2 - essential for automotive manufacturing and environmental compliance.
How does SMBJ51AHM3/H compare to bidirectional TVS diodes like SMBJ51CA?
SMBJ51AHM3/H is unidirectional and optimized for DC power rail protection where polarity is fixed, offering tighter leakage control (<1 µA at 51 V) and higher forward surge rating (100 A). In contrast, SMBJ51CA is bidirectional, suited for AC lines or differential signals, but exhibits doubled leakage at low VWM and lacks forward conduction capability - making SMBJ51AHM3/H preferable for 12 V/24 V automotive supply rails.
What is the thermal resistance of SMBJ51AHM3/H, and how does it affect layout?
SMBJ51AHM3/H 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. To maintain safe junction temperatures under repeated surges, PCB layout must replicate this minimum pad area and avoid thermal isolation - insufficient copper will cause premature thermal runaway during high-duty-cycle transients.
SMBJ51AHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SMBJ51AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51AHM3/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/H reliable?
The price and inventory of SMBJ51AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMBJ51AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51AHM3/H?
SMBJ51AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51AHM3/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/H?
For technical support, including SMBJ51AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51AHM3/H requirements.
6.How does Aetrix verify that SMBJ51AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ51AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMBJ51AHM3/H?
All SMBJ51AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51AHM3/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/H part is unused and in its original packaging.
Return procedure for SMBJ51AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51AHM3/H Tags
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