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Vishay General Semiconductor - Diodes Division SMBJ51CAHM3_B/H
- Part No.:
- SMBJ51CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CAHM3_B/H.pdf
- Description:
- 600W,51V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,549
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Product details
Overview
SMBJ51CAHM3_B/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power 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 range - deployed in industrial sensor interface protection and automotive ECUs.
For engineers reviewing the SMBJ51CAHM3_B/H datasheet, SMBJ51CAHM3_B/H pinout, SMBJ51CAHM3_B/H application, or SMBJ51CAHM3_B/H equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ps) and low incremental surge resistance, enabling effective suppression of ESD, lightning-induced surges, and inductive switching transients. Its symmetrical breakdown characteristic ensures identical clamping in both polarities, with VBR min/max of 56.7 V / 62.7 V at 1 mA test current.
The device is rated for 600 W peak pulse power under 10/1000 μs waveform at 0.01% duty cycle, derated linearly above 25 °C ambient per Fig. 2, and supports repetitive surge events when thermally managed on ≥5.0 mm × 5.0 mm copper pads per JEDEC standard mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - Breakdown voltage range confirming bidirectional symmetry and process consistency. |
| VC @ IPPM | 82.4 V at 7.3 A - Clamping voltage during 600 W transient; determines protected circuit's maximum stress level. |
| PPPM | 600 W (10/1000 μs) - Peak surge energy handling capacity; validates suitability for IEC 61000-4-5 Level 3/4 compliance designs. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; requires ≥5.0 mm × 5.0 mm copper pad area for full power rating. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial environments. |
| Construction | Halogen-free, RoHS-compliant, AEC-Q101 qualified - Meets automotive reliability standards and environmental compliance mandates. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), matte tin-plated leads solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative polarity) | Accepts reverse surge current during negative half-cycle; forms symmetrical clamping path with cathode. |
| Cathode | Transient current entry point (positive polarity) | Accepts reverse surge current during positive half-cycle; completes bidirectional conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Supports high-energy transients per IEC 61000-4-5 without degradation; validated at 0.01% duty cycle. |
| Bidirectional clamping symmetry | VBR tolerance ±5.5% ensures matched positive/negative breakdown; eliminates need for polarity-aware layout. |
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and JESD201 Class 2 whisker resistance; suitable for green manufacturing. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus lines and analog sensor inputs (e.g., pressure, temperature) in engine control modules against load dump and ESD. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector or IC input pins to shunt surge energy to ground. Use Value: Limits transient voltage to ≤82.4 V, preserving integrity of 5 V or 3.3 V microcontrollers and transceivers per ISO 7637-2 Pulse 5a/b. |
Use Scenario: Safeguarding digital input/output channels in programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Parallel-connected TVS at terminal block or PCB edge to absorb 600 W inductive spikes before reaching FPGA or isolation barrier. Use Value: Maintains system uptime by preventing latch-up or gate oxide damage in 24 V DC I/O circuits during 100 ms surges. |
| Telecom Power Supply Input | Consumer Appliance Motor Control |
|
Use Scenario: Front-end protection of AC/DC and DC/DC converters in base station power supplies subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level clamping device placed after fuse and before bulk capacitor to limit differential-mode transients. Use Value: Withstands 7.3 A peak current at 82.4 V clamping, reducing downstream MOV stress and extending PSU lifetime. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role / Timing Role: Mounted across motor terminals or H-bridge outputs to clamp inductive kickback during PWM switching. Use Value: Prevents MOSFET avalanche failure by clamping <100 ns transients to 82.4 V, compatible with 100 V-rated power stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CAHE3_B/H | Same electrical specs and package, but RoHS-compliant without halogen-free certification; no JESD201 Class 2 whisker validation. | Approved for commercial-grade industrial equipment where halogen-free mandate does not apply. | Select when AEC-Q101 is unnecessary and cost optimization is prioritized over automotive or green manufacturing requirements. |
| SMAJ51CA-M3/A | Lower 400 W peak pulse power (10/1000 μs), SMA package (smaller footprint, higher RθJA = 140 °C/W), same VWM/VC. | Suitable for space-constrained consumer electronics with lower surge exposure (e.g., USB port protection). | Choose only if board area is critical and surge threat level is below IEC 61000-4-5 Level 2; verify thermal margin with reduced copper area. |
Compared with SMBJ51CAHE3_B/H and SMAJ51CA-M3/A, SMBJ51CAHM3_B/H uniquely combines AEC-Q101 qualification, halogen-free construction, and full 600 W capability in SMB package - making it the preferred choice for automotive and high-reliability industrial deployments requiring traceable green sourcing.
Availability
SMBJ51CAHM3_B/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O protection, and telecom power supply front-end surge suppression requiring stable component supply, long-term lifecycle support, and halogen-free compliance.
Supply support for SMBJ51CAHM3_B/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMBJ series targets robust transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where surge immunity, thermal stability, and regulatory compliance are non-negotiable.
FAQ
What is the clamping voltage of SMBJ51CAHM3_B/H at its rated peak pulse current?
The SMBJ51CAHM3_B/H has a maximum clamping voltage (VC) of 82.4 V at its rated peak pulse current (IPPM) of 7.3 A 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 SMBJ51CAHM3_B/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) when mounted per recommended pad layout.
Is SMBJ51CAHM3_B/H suitable for automotive applications?
Yes, SMBJ51CAHM3_B/H is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials per JESD201 Class 2 whisker testing. Its 150 °C maximum junction temperature, 600 W surge rating, and bidirectional symmetry make it appropriate for engine control units, body control modules, and ADAS sensor interfaces. The HM3 suffix explicitly denotes automotive-grade construction, distinguishing it from commercial variants like SMBJ51CA-E3.
How does the SMBJ51CAHM3_B/H differ from unidirectional SMBJ51A variants?
The SMBJ51CAHM3_B/H is bidirectional, meaning it clamps transients of either polarity symmetrically, with no cathode band marking. In contrast, unidirectional SMBJ51A types feature a cathode band and conduct only in reverse bias - they cannot suppress positive-going transients on grounded lines. The "CA" suffix confirms bidirectionality, and SMBJ51CAHM3_B/H shares identical VWM, VBR, and PPPM ratings with its unidirectional counterpart but serves dual-polarity protection needs without external polarity management.
What is the thermal resistance and recommended PCB layout for SMBJ51CAHM3_B/H?
SMBJ51CAHM3_B/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, as specified in the Vishay datasheet. To sustain full 600 W pulse rating, designers must implement minimum pad dimensions and consider thermal vias beneath the device. Reduced copper area increases RθJA, lowering allowable surge repetition rate and requiring derating per Figure 2 in the SMBJ5.0A–SMBJ188A datasheet.
Does SMBJ51CAHM3_B/H meet UL recognition requirements?
Yes, SMBJ51CAHM3_B/H carries Underwriters Laboratories recognition under UL 497B (QVGQ2) and file number E136766 for both unidirectional and bidirectional transient protectors. This certification validates its safety performance in telecommunications and industrial equipment. The UL listing applies specifically to the SMBJ51CAHM3_B/H construction - including its halogen-free molding compound and matte tin-plated leads - and supports compliance with end-equipment safety standards requiring recognized protection components.
SMBJ51CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ51CAHM3_B/H FAQ
1.How can I place an order for SMBJ51CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CAHM3_B/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 SMBJ51CAHM3_B/H reliable?
The price and inventory of SMBJ51CAHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ51CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CAHM3_B/H?
SMBJ51CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CAHM3_B/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 SMBJ51CAHM3_B/H?
For technical support, including SMBJ51CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ51CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ51CAHM3_B/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 SMBJ51CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ51CAHM3_B/H?
All SMBJ51CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CAHM3_B/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 SMBJ51CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ51CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CAHM3_B/H Tags
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