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Vishay General Semiconductor - Diodes Division SMBJ51CAHE3_B/H
- Part No.:
- SMBJ51CAHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CAHE3_B/H.pdf
- Description:
- 600W,51V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,341
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Product details
Overview
SMBJ51CAHE3_B/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff voltage (VWM), 600 W peak pulse power (10/1000 µs), clamping voltage of 82.4 V at 7.3 A peak surge current, and operates across -55 °C to +150 °C junction temperature - deployed on signal lines of industrial sensor units and automotive ECUs.
For engineers reviewing the SMBJ51CAHE3_B/H datasheet, SMBJ51CAHE3_B/H pinout, SMBJ51CAHE3_B/H application, or SMBJ51CAHE3_B/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance data (RθJA = 100 °C/W), clamping performance under standardized transients, and real-world deployment context for ESD/lightning/surge protection design.
Technical Context
This bidirectional TVS diode operates symmetrically in both polarities, with breakdown voltage (VBR) specified at 56.7–62.7 V (min/max) at 1 mA test current and maximum reverse leakage of 1.0 µA at 51 V standoff. Its low clamping ratio (VC/VWM ≈ 1.62) ensures effective voltage limiting during fast transients.
The device uses a glass-passivated silicon junction, supports automated SMT placement, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and is qualified to AEC-Q101 for automotive use - confirmed by HE3 suffix and ordering code "SMBJ51CAHE3_B/H".
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 51 V - Maximum continuous reverse operating voltage before significant conduction begins. |
| VBR (Breakdown Voltage) | 56.7–62.7 V at 1 mA - Voltage at which device enters avalanche breakdown; defines minimum clamping threshold. |
| VC (Clamping Voltage) | 82.4 V at IPPM = 7.3 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case transient. |
| PPPM (Peak Pulse Power) | 600 W - Maximum transient energy absorption capability under standard 10/1000 µs waveform. |
| IPPM (Peak Pulse Current) | 7.3 A - Surge current corresponding to VC; determines minimum PCB trace width and fuse coordination. |
| TJmax | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient; informs heatsinking requirements on standard 0.2" × 0.2" copper pads. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts surge current during negative-going transients; connects to protected line or ground return path. |
| Cathode | Transient current entry (positive polarity) | Accepts surge current during positive-going transients; forms bidirectional clamping path with anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| AEC-Q101 qualification | Validated reliability for automotive applications including engine control, body electronics, and ADAS sensors. |
| 600 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) when properly laid out on PCB. |
| Low clamping voltage (82.4 V) | Provides 1.6× margin below typical 100 V automotive load-dump thresholds, protecting downstream ICs. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - reduces manufacturing overhead. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) in engine compartments exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and chassis ground to shunt transients before reaching interface ICs. Use Value: Maintains signal integrity during 100 V/50 ms load dump events while surviving repeated 600 W surges per IEC 61000-4-5. |
Use Scenario: Shielding 24 V DC digital input modules in programmable logic controllers from inductive kickback and lightning-induced surges on factory floor wiring. IC Role / Device Role / Timing Role: Primary overvoltage suppression element at terminal block entry point, coordinated with upstream fuses. Use Value: Limits transient voltage to ≤82.4 V within 1 ns response time, preventing latch-up in microcontroller GPIOs. |
| Telecom Line Interface | Consumer Appliance Motor Control |
|
Use Scenario: Safeguarding Ethernet PHYs and RS-485 transceivers in outdoor telecom cabinets subjected to induced lightning surges on long cable runs. IC Role / Device Role / Timing Role: First-stage TVS in multi-stage protection scheme, absorbing bulk energy before secondary MOV/GDT stages. Use Value: Delivers 600 W pulse handling with <1 ns response, reducing let-through energy to downstream protection components. |
Use Scenario: Protecting gate drivers and MCU pins in smart washing machine motor inverters from commutation spikes generated by BLDC motors. IC Role / Device Role / Timing Role: Localized clamping device mounted directly at motor driver IC supply pins and feedback signal nodes. Use Value: Clamps 51 V standby rail to 82.4 V during 7.3 A transients, preventing overvoltage damage to 5 V logic interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CAHM3_B/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU WEEE, specific OEM specs). | Choose SMBJ51CAHM3_B/H when halogen-free construction is required; otherwise SMBJ51CAHE3_B/H suffices. |
| SMAJ51CAHE3/A | Lower 400 W PPPM, SMA (DO-214AC) package, same VWM/VC but higher RθJA (140 °C/W). | Reduced surge handling; suitable only for lower-energy threats or space-constrained layouts where SMB footprint is unavailable. | Select SMAJ51CAHE3/A only if board area is critical and transient threat level is ≤400 W; SMBJ51CAHE3_B/H provides superior robustness. |
Compared with SMBJ51CAHM3_B/H, the original SMBJ51CAHE3_B/H offers identical protection performance with standard RoHS compliance; versus SMAJ51CAHE3/A, it delivers 50 % higher surge power rating and better thermal dissipation - critical for automotive and industrial deployments.
Availability
SMBJ51CAHE3_B/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O protection, and telecom line interface circuits requiring stable component supply, AEC-Q101 validation, and consistent 600 W transient immunity.
Supply support for SMBJ51CAHE3_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, automotive qualification, and high-volume manufacturability.
The SMBJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom applications where failure tolerance and long-term stability are non-negotiable.
FAQ
What is the clamping voltage of SMBJ51CAHE3_B/H at its rated peak pulse current?
The SMBJ51CAHE3_B/H has a maximum clamping voltage (VC) of 82.4 V at 7.3 A peak pulse current (IPPM) under the standard 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. The SMBJ51CAHE3_B/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMBJ51CAHE3_B/H qualified for automotive applications?
Yes, SMBJ51CAHE3_B/H is AEC-Q101 qualified, as confirmed by the "HE3" suffix and Vishay's official ordering documentation. It is rated for operation from -55 °C to +150 °C junction temperature and meets MSL Level 1 for lead-free reflow. The SMBJ51CAHE3_B/H is approved for use in engine control units, body electronics, and ADAS sensor interfaces where automotive-grade reliability is mandatory.
How does the bidirectional configuration of SMBJ51CAHE3_B/H affect its PCB layout?
The SMBJ51CAHE3_B/H has no polarity marking and functions identically in both directions, simplifying PCB layout for AC-coupled or floating signal paths. Unlike unidirectional TVS diodes, it requires no orientation verification during placement - reducing assembly errors and enabling direct replacement in differential or transformer-isolated interfaces. Its SMB (DO-214AA) footprint remains unchanged regardless of signal polarity.
What is the thermal resistance of SMBJ51CAHE3_B/H, and how does it impact board design?
The SMBJ51CAHE3_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. This value assumes standard FR-4 PCB with no internal copper planes. To maintain safe junction temperatures during repetitive surges, designers must ensure adequate copper area and avoid excessive ambient temperature buildup - especially in sealed enclosures or under-hood automotive locations.
Can SMBJ51CAHE3_B/H replace unidirectional TVS diodes like SMBJ51AHE3_B/H in existing designs?
No - SMBJ51CAHE3_B/H is bidirectional and cannot directly replace unidirectional variants such as SMBJ51AHE3_B/H in DC-biased circuits where polarity-specific clamping is required. In a unidirectional application (e.g., 51 V supply rail protection), using SMBJ51CAHE3_B/H would allow conduction during normal forward bias, causing leakage or failure. Always match device polarity to circuit topology: SMBJ51CAHE3_B/H for AC/floating lines, SMBJ51AHE3_B/H for DC rails.
SMBJ51CAHE3_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)
SMBJ51CAHE3_B/H FAQ
1.How can I place an order for SMBJ51CAHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CAHE3_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 SMBJ51CAHE3_B/H reliable?
The price and inventory of SMBJ51CAHE3_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 SMBJ51CAHE3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ51CAHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CAHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CAHE3_B/H?
SMBJ51CAHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CAHE3_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 SMBJ51CAHE3_B/H?
For technical support, including SMBJ51CAHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CAHE3_B/H requirements.
6.How does Aetrix verify that SMBJ51CAHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ51CAHE3_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 SMBJ51CAHE3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ51CAHE3_B/H?
All SMBJ51CAHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CAHE3_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 SMBJ51CAHE3_B/H part is unused and in its original packaging.
Return procedure for SMBJ51CAHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CAHE3_B/H Tags
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