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Vishay General Semiconductor - Diodes Division SMBJ51AHM3/I
- Part No.:
- SMBJ51AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51AHM3/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,347
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Product details
Overview
SMBJ51AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 51 V standoff 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 dissipation with a 10/1000 µs waveform.
For engineers reviewing the SMBJ51AHM3/I datasheet, SMBJ51AHM3/I pinout, SMBJ51AHM3/I application, or SMBJ51AHM3/I equivalent, this device is selected for robust overvoltage protection on DC power rails and low-speed signal lines in industrial control systems, automotive ECUs, and telecom interface circuits where fast response (<1 ns), low clamping ratio, and AEC-Q101 qualification are critical.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction for stable avalanche behavior under repetitive surge conditions. Its thermal resistance (RθJA = 100 °C/W) and junction temperature limit (TJ = 150 °C) define its derating envelope above 25 °C ambient.
The SMBJ51AHM3/I delivers 7.3 A peak pulse current (IPPM) at 82.4 V clamping while maintaining <1.0 µA reverse leakage at 51 V, enabling reliable protection of 51 V-rated circuits without false triggering. Its halogen-free, RoHS-compliant construction and J-STD-020 MSL Level 1 rating support lead-free reflow assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected circuit's nominal DC rail. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - Confirmed breakdown range ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 82.4 V at 7.3 A - Clamping voltage defines worst-case overvoltage seen by downstream ICs during 10/1000 µs surge events. |
| PPPM | 600 W - Peak pulse power handling capability with 0.01% duty cycle; supports repeated surge immunity per IEC 61000-4-5. |
| IPPM | 7.3 A - Peak pulse current derived from 600 W / 82.4 V; validates protection margin for defined surge waveforms. |
| TJ max. | 150 °C - Maximum junction temperature; determines thermal design headroom for PCB copper pad layout and power cycling. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 0.205" × 0.130" footprint; compatible with automated pick-and-place and reflow. |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; forms current path during reverse-biased clamping event. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 51 V rail); avalanche conduction occurs when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 Level 3 (1 kV surge) on 51 V DC lines without external series impedance. |
| 82.4 V clamping voltage at 7.3 A | Clamping ratio (VC/VWM) of 1.62 ensures protected ICs experience ≤62% overvoltage during worst-case surge. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control modules and body electronics requiring extended temperature and reliability testing. |
| Halogen-free, RoHS-compliant | Meets environmental compliance requirements for industrial and consumer products sold in EU, China, and North America. |
| MSL Level 1 (260 °C peak) | Supports single-reflow assembly without moisture sensitivity concerns; eliminates bake-out requirement prior to SMT. |
Applications
| Industrial Motor Drives | Automotive Engine Control Units |
|---|---|
|
Use Scenario: Protection of 51 V auxiliary power rails feeding gate drivers and current sensors in variable-frequency drives. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed directly across rail-to-ground to shunt inductive kickback from IGBT/MOSFET switching. Use Value: Limits transient overvoltage to 82.4 V, preventing latch-up or oxide breakdown in 65 V-rated gate drivers and isolated amplifiers. |
Use Scenario: Surge suppression on 51 V battery-sensed supply lines in diesel engine ECU power management subsystems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power input, activated within <1 ns of load dump or alternator ripple events. Use Value: Withstands 7.3 A peak pulses while maintaining <1 µA leakage at 51 V, ensuring no impact on low-power sleep-mode current budgets. |
| Telecom Power Feeds | Renewable Energy Inverters |
|
Use Scenario: Protection of 51 V DC feed lines powering remote radio units (RRUs) in 4G/5G base stations exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Front-end transient suppressor mounted at connector entry point, upstream of DC-DC converters and PMICs. Use Value: 600 W pulse rating handles IEC 61000-4-5 combination wave (1.2/50 µs + 8/20 µs) surges up to ±1 kV without degradation. |
Use Scenario: Overvoltage clamping on 51 V auxiliary control rails in solar string inverters subject to grid-switching transients and PV array arcing. IC Role / Device Role / Timing Role: Unidirectional rail protector placed between MPPT controller output and microcontroller power domain. Use Value: Glass-passivated junction ensures stable VBR over 1000+ surge cycles, supporting 25-year field life in outdoor installations. |
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/I | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification; same electrical specs and SMB package. | Suitable for commercial/industrial use only; not approved for automotive under hood or chassis locations. | Select SMBJ51AHE3/I when halogen-free content is not required and automotive qualification is unnecessary. |
| SMBJ51A-M3/5B | Same halogen-free, RoHS-compliant construction; differs only in packaging format (13" reel, 3200 pcs) and base P/N suffix. | No functional difference; identical performance and qualification; used for high-volume production runs. | Choose SMBJ51A-M3/5B when sourcing large volumes with standard tape-and-reel delivery for automated manufacturing. |
Compared with SMBJ51AHE3/I and SMBJ51A-M3/5B, the SMBJ51AHM3/I uniquely combines halogen-free materials, RoHS compliance, and AEC-Q101 qualification in the SMB package-making it the only option qualified for automotive under-hood deployment while maintaining identical electrical performance.
Availability
SMBJ51AHM3/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive engine control units, and telecom power feeds requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for SMBJ51AHM3/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 application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against ESD, EFT, and surge events is non-negotiable.
FAQ
What is the clamping voltage of SMBJ51AHM3/I at its rated peak pulse current?
The SMBJ51AHM3/I has a maximum clamping voltage (VC) of 82.4 V at 7.3 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ51AHM3/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMBJ51AHM3/I qualified for automotive applications?
Yes, SMBJ51AHM3/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its part number, indicating halogen-free, RoHS-compliant construction plus full automotive stress testing. It is approved for use in engine control units, body electronics, and other under-hood or chassis-mounted systems where reliability under thermal cycling, vibration, and surge exposure is mandatory. The SMBJ51AHM3/I meets all test requirements per AEC-Q101 Rev D.
What does the "HM3" suffix indicate in SMBJ51AHM3/I?
The "HM3" suffix in SMBJ51AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. "H" indicates halogen-free molding compound, "M3" confirms RoHS compliance and JESD201 Class 2 whisker resistance, and the "_I" denotes 13-inch tape-and-reel packaging (3200 pcs). This distinguishes it from commercial-grade variants like SMBJ51A-E3/I and automotive-grade HE3 variants lacking halogen-free certification.
How does SMBJ51AHM3/I differ from bidirectional TVS diodes like SMBJ51CA?
The SMBJ51AHM3/I is unidirectional and functions only during reverse-bias overvoltage events, with polarity marked by a cathode band. In contrast, SMBJ51CA is bidirectional and clamps in both directions, making it suitable for AC signal lines or differential buses. SMBJ51AHM3/I offers lower leakage (<1 µA at 51 V) and higher surge current capability in its intended direction, while SMBJ51CA exhibits symmetrical VBR and double the ID limit for VWM ≤ 10 V-neither applies to SMBJ51AHM3/I.
What is the thermal resistance of SMBJ51AHM3/I, and how does it affect layout?
The SMBJ51AHM3/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. This value requires PCB designers to allocate adequate copper area for heat dissipation during repetitive surge events. Reducing RθJA via larger pads or internal planes improves surge endurance; exceeding 150 °C junction temperature risks parametric shift or failure. The SMBJ51AHM3/I's RθJL of 20 °C/W further supports thermal coupling to PCB ground planes.
SMBJ51AHM3/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:
- 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/I FAQ
1.How can I place an order for SMBJ51AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51AHM3/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/I reliable?
The price and inventory of SMBJ51AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ51AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51AHM3/I?
SMBJ51AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51AHM3/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/I?
For technical support, including SMBJ51AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51AHM3/I requirements.
6.How does Aetrix verify that SMBJ51AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ51AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ51AHM3/I?
All SMBJ51AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51AHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ51AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51AHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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