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Vishay General Semiconductor - Diodes Division SMBJ51D-M3/H
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- Part No.:
- SMBJ51D-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51D-M3/H.pdf
- Description:
- TVS DIODE 51VWM 81.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,931
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Product details
Overview
SMBJ51D-M3/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), 57.6–61.8 V breakdown voltage (VBR) at 1 mA, 81.2 V maximum clamping voltage (VC) at 7.4 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines of industrial sensor interfaces.
For engineers reviewing the SMBJ51D-M3/H datasheet, SMBJ51D-M3/H pinout, SMBJ51D-M3/H application, or SMBJ51D-M3/H equivalent, this page delivers verified electrical parameters, thermal derating behavior, MSL Level 1 reflow compatibility, halogen-free RoHS-compliant construction, and bidirectional alternative options - all critical for ESD/surge protection design validation and BOM continuity planning.
Technical Context
This TVS diode operates as a clamping-type overvoltage protector: under normal bias it presents high impedance (>100 MΩ at 51 V), then rapidly transitions to low-impedance conduction when transient voltage exceeds VBR. Its 1.0 W steady-state power dissipation at 25 °C ambient and 5.0 W at 50 °C case temperature reflect thermal design constraints tied to PCB pad layout per JEDEC standards.
The device complies with ANSI/IEEE C62.35 surge testing requirements and achieves UL 497B recognition (file E136766). Its ±3.5 % VBR tolerance ensures precise triggering across production lots, while its 125 °C/W junction-to-ambient thermal resistance mandates careful thermal pad sizing for sustained surge duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 51 V - maximum continuous reverse operating voltage before leakage exceeds 0.5 μA; defines safe DC operating margin |
| VBR (Breakdown Voltage) | 57.6–61.8 V at 1 mA - tight ±3.5 % tolerance ensures consistent clamping onset across units |
| VC (Clamping Voltage) | 81.2 V at 7.4 A IPPM - limits transient voltage seen by protected ICs during 10/1000 μs surge events |
| PPPM (Peak Pulse Power) | 600 W - rated for non-repetitive 10/1000 μs surges at 0.01 % duty cycle; defines single-event energy handling |
| ID (Reverse Leakage) | ≤0.5 μA at 51 V - ensures minimal standby power loss and signal integrity on high-impedance lines |
| TJ max | 150 °C - maximum junction temperature limit; constrains thermal design for repeated surge exposure |
| RθJA | 125 °C/W - thermal resistance from junction to ambient on minimum recommended pad layout; guides PCB copper area sizing |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow), matte tin-plated leads. Cathode indicated by band at one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; forms clamping path during positive transients |
| Cathode (banded end) | High-side surge input terminal | Connected to protected line (e.g., 51 V rail or signal); conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise, repeatable clamping threshold without system-level calibration or margining overhead |
| 600 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity on 51 V supply rails with appropriate series impedance |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT manufacturing flow |
| UL 497B recognized (E136766) | Validates compliance for telecom and industrial equipment safety certification without additional testing |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response), improving protection fidelity |
Applications
| Industrial Sensor Interface Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop transmitters and RS-485 nodes against load-dump and inductive switching spikes in factory automation systems. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and ground, absorbing >600 W transient energy without latch-up. Use Value: Prevents damage to precision op-amps and ADC front-ends while maintaining <0.5 μA leakage at 51 V nominal rail. |
Use Scenario: Safeguarding 51 V auxiliary power domains in BCMs exposed to ISO 7637-2 Pulse 1/2/5a surges during vehicle ignition and alternator load dump. IC Role / Device Role / Timing Role: Standoff-rated TVS on switched 51 V supply, clamping transients within 1 ns to hold downstream LDOs and microcontrollers below absolute maximum ratings. Use Value: Delivers 81.2 V clamping at 7.4 A - sufficient to meet ISO 16750-2 Class IV surge requirements with minimal board space. |
| Telecom Base Station DC Power Input | Medical Imaging Equipment Signal Conditioning |
Use Scenario: Front-end protection of -48 V DC input stages in 5G remote radio units subject to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Unidirectional TVS mounted directly at connector entry point, shunting surge current to chassis ground before reaching DC/DC converters. Use Value: Withstands 600 W pulses and maintains ≤0.5 μA leakage at -48 V, ensuring no drift in bias networks of RF amplifiers. |
Use Scenario: Shielding analog front-end amplifiers and sigma-delta ADCs in MRI gradient coil control modules from ESD and switching noise on isolated sensor lines. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 100 pF at 0 V) placed adjacent to ADC inputs, clamping sub-100 ns transients without signal distortion. Use Value: Tight 57.6–61.8 V VBR ensures predictable turn-on during 8 kV HBM ESD events, preserving diagnostic accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CD-M3/H | Bidirectional variant; same VWM (51 V), symmetric clamping in both polarities; slightly higher VC (84.5 V at 7.2 A) | Required where AC-coupled or differential signal lines (e.g., RS-422, CAN FD) need symmetrical protection | Select SMBJ51CD-M3/H only if bidirectional clamping is mandated by signal polarity behavior; otherwise SMBJ51D-M3/H offers lower VC for unidirectional rails. |
| SMAJ51A-M3/H | Lower PPPM (400 W), same VWM/VBR range, SMA package (smaller footprint, higher RθJA = 150 °C/W) | Suitable for space-constrained designs with lower surge threat levels (e.g., IEC 61000-4-2 ESD only) | Choose SMAJ51A-M3/H only when board area is critical and surge energy does not exceed 400 W; SMBJ51D-M3/H provides 50 % higher energy margin. |
Compared with SMBJ51CD-M3/H and SMAJ51A-M3/H, the SMBJ51D-M3/H delivers optimal balance of 600 W surge capacity, 81.2 V clamping, and SMB package manufacturability - making it the preferred choice for industrial 51 V rail protection where unidirectional transients dominate.
Availability
SMBJ51D-M3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, telecom base station power inputs, and medical imaging signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ51D-M3/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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for industrial, automotive, and computing markets.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting applications demanding UL recognition, tight VBR tolerance, and proven surge survivability per IEC/ISO standards.
FAQ
What is the maximum clamping voltage of SMBJ51D-M3/H at its rated peak pulse current?
The SMBJ51D-M3/H has a maximum clamping voltage (VC) of 81.2 V at 7.4 A peak pulse current (IPPM), measured using the standard 10/1000 μs double-exponential surge waveform. This value defines the highest voltage that will appear across protected circuitry during a full-rated transient event, and is confirmed in the Vishay datasheet Document Number 87606, Table "ELECTRICAL CHARACTERISTICS" for SMBJ51D.
Is SMBJ51D-M3/H RoHS-compliant and halogen-free?
Yes, SMBJ51D-M3/H is halogen-free and RoHS-compliant, as indicated by the "-M3" suffix in the part number. Vishay specifies that the M3 suffix denotes industrial-grade construction meeting JESD 201 Class 2 whisker resistance, UL 94 V-0 flammability, and RoHS Directive 2011/65/EU requirements - verified in the "MECHANICAL DATA" section of the official datasheet.
What is the thermal resistance junction-to-ambient for SMBJ51D-M3/H?
The typical thermal resistance junction-to-ambient (RθJA) for SMBJ51D-M3/H is 125 °C/W when mounted on the minimum recommended PCB pad layout, per Vishay's Thermal Characteristics table. This value increases significantly with insufficient copper area and must be used alongside the derating curve (Fig. 5) to ensure TJ remains ≤150 °C under sustained power dissipation.
Does SMBJ51D-M3/H have UL recognition?
Yes, SMBJ51D-M3/H carries Underwriters Laboratory (UL) Recognition under standard UL 497B, file number E136766, covering both unidirectional and bidirectional variants in the SMBJ family. This certification applies to surge protective devices used in telecommunications and industrial equipment, and is explicitly cited in the "Notes" section of the Vishay datasheet.
What is the reverse leakage current specification for SMBJ51D-M3/H at its stand-off voltage?
The SMBJ51D-M3/H exhibits a maximum reverse leakage current (ID) of 0.5 μA at its 51 V stand-off voltage (VWM), tested at TA = 25 °C. This low leakage preserves signal integrity and minimizes power loss in high-impedance monitoring circuits - a key parameter validated in the "ELECTRICAL CHARACTERISTICS" table of the Vishay SMBJ5.0D–SMBJ188D datasheet.
SMBJ51D-M3/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 57.6V
- Voltage - Clamping (Max) @ Ipp:
- 81.2V
- Current - Peak Pulse (10/1000µs):
- 7.4A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ51D-M3/H FAQ
1.How can I place an order for SMBJ51D-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51D-M3/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 SMBJ51D-M3/H reliable?
The price and inventory of SMBJ51D-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51D-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ51D-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51D-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51D-M3/H?
SMBJ51D-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51D-M3/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 SMBJ51D-M3/H?
For technical support, including SMBJ51D-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51D-M3/H requirements.
6.How does Aetrix verify that SMBJ51D-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ51D-M3/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 SMBJ51D-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ51D-M3/H?
All SMBJ51D-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51D-M3/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 SMBJ51D-M3/H part is unused and in its original packaging.
Return procedure for SMBJ51D-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51D-M3/H Tags
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