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Vishay General Semiconductor - Diodes Division SMBJ51CAHE3_B/I
- Part No.:
- SMBJ51CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CAHE3_B/I.pdf
- Description:
- 600W,51V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,883
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Product details
Overview
SMBJ51CAHE3_B/I 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 standoff voltage (VWM), 600 W peak pulse power (10/1000 µs), clamping voltage of 82.4 V at 7.3 A, and operates across -55 °C to +150 °C junction temperature - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ51CAHE3_B/I datasheet, SMBJ51CAHE3_B/I pinout, SMBJ51CAHE3_B/I application, or SMBJ51CAHE3_B/I equivalent, this device serves as a robust, AEC-Q101-qualified transient suppressor for bidirectional DC rails, I/O ports, and low-capacitance signal paths where fast response (<1 ns), low clamping ratio, and MSL Level 1 reflow compatibility are critical.
Technical Context
This bidirectional TVS operates symmetrically in both polarities with identical breakdown (VBR min/max = 56.7 V / 62.7 V at 1 mA) and clamping behavior. Its glass-passivated junction ensures stable leakage (<1 µA at 51 V) and repeatable surge performance under repetitive 0.01% duty cycle conditions.
The device delivers 600 W peak pulse power per 10/1000 µs waveform with low incremental surge resistance, enabling effective suppression of ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and lightning-induced surges (IEC 61000-4-5). Thermal resistance (RθJA = 100 °C/W) supports operation on standard 0.2" × 0.2" copper pads without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on within spec across temperature and lot. |
| VC @ IPPM | 82.4 V at 7.3 A - Clamped voltage during 600 W transient; defines worst-case overvoltage seen by downstream ICs. |
| PPPM | 600 W - Peak pulse power handling per 10/1000 µs waveform; validates protection against common surge standards. |
| IPPM | 7.3 A - Peak surge current supported at rated clamping voltage; determines minimum trace width and PCB layout robustness. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| MSL Level | Level 1 (J-STD-020) - Supports lead-free reflow up to 260 °C peak without preconditioning; simplifies SMT assembly. |
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 compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative transients; symmetrical with cathode for bidirectional clamping. |
| Cathode | Transient current entry (positive polarity) | Accepts forward surge current during positive transients; forms low-impedance path to ground/rail during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates compliance with IEC 61000-4-5 Level 3 (1 kV/2 Ω) and automotive load dump immunity requirements. |
| AEC-Q101 qualified (HE3 suffix) | Confirms reliability for automotive electronics including body control modules, ADAS sensors, and infotainment power rails. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V/5 V logic and precision analog front-ends. |
| MSL Level 1, 260 °C peak reflow | Enables direct placement into high-volume lead-free SMT lines without baking or special handling. |
| Glass passivated junction | Ensures long-term stability of leakage current and breakdown voltage under thermal cycling and humidity exposure. |
Applications
| Industrial Sensor Interface | Telecom Data Line Protection |
|---|---|
|
Use Scenario: Protecting RS-485 transceivers and analog sensor outputs (e.g., 4–20 mA loops) from induced switching transients in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential pair or supply rail to limit fault voltage to <83 V. Use Value: Prevents latch-up or permanent damage to transceivers during 1 kV EFT bursts while maintaining signal integrity via low capacitance (<100 pF). |
Use Scenario: Safeguarding Ethernet PHY interfaces and DSL line drivers against lightning-induced surges on outdoor-facing telecom equipment. IC Role / Device Role / Timing Role: Primary-level TVS mounted at connector entry point to shunt >500 W transients before reaching isolation transformers or PHY ICs. Use Value: Achieves IEC 61000-4-5 Level 4 (4 kV) protection when combined with series impedance, with sub-nanosecond response preserving data rate integrity. |
| Automotive Body Control Module | Consumer Power Adapter Input Stage |
|
Use Scenario: Suppressing load dump and jump-start transients on 12 V power inputs of BCMs, lighting controllers, and window lift ECUs. IC Role / Device Role / Timing Role: Secondary-stage TVS after primary fuse and LC filter, clamping residual spikes to protect LDOs and microcontrollers. Use Value: AEC-Q101 qualification guarantees operation at 150 °C ambient and withstands 1000+ thermal cycles - essential for under-dash mounting. |
Use Scenario: Guarding AC-DC adapter primary-side rectifier outputs and secondary-side 5 V/12 V rails against mains-borne surges and ESD coupling. IC Role / Device Role / Timing Role: Bidirectional clamp across DC output terminals to prevent overvoltage damage to USB-PD controllers and charging ICs. Use Value: 51 V VWM provides 20% margin above nominal 42 V peak (12 V × √3 rectified), avoiding false triggering during normal ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CAHM3_B/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free material compliance is mandated by OEM or regional regulations. | Choose SMBJ51CAHM3_B/I if halogen-free construction is required; otherwise SMBJ51CAHE3_B/I offers standard RoHS compliance at lower cost. |
| SMAJ51CAHE3/A | Same VWM/VC but lower PPPM (400 W), smaller SMA (DO-214AC) package, higher RθJA (140 °C/W). | Reduced surge margin; suitable only for non-automotive, low-energy transients where board space is constrained. | Select SMAJ51CAHE3/A only when footprint reduction outweighs need for full 600 W rating - not recommended for automotive or industrial surge-critical designs. |
Compared with SMBJ51CAHE3_B/I, the HM3 variant adds halogen-free chemistry without electrical trade-offs, while the SMAJ51CAHE3/A sacrifices 33% pulse power and thermal performance for smaller size - making SMBJ51CAHE3_B/I the optimal balance of robustness, qualification, and manufacturability for demanding applications.
Availability
SMBJ51CAHE3_B/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and consumer power adapter input stages requiring stable component supply, AEC-Q101 validation, and consistent MSL Level 1 reflow compatibility.
Supply support for SMBJ51CAHE3_B/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMBJ series targets high-reliability transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where surge immunity, thermal stability, and long-term parametric consistency are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ51CAHE3_B/I at its rated peak pulse current?
The SMBJ51CAHE3_B/I clamps to a maximum of 82.4 V at its specified peak pulse current of 7.3 A (10/1000 µs waveform). This value is measured and guaranteed per Vishay's datasheet (Document Number: 88392, Rev. 09-Jan-2024), ensuring downstream circuitry remains within safe overvoltage limits during transient events. The clamping voltage directly defines protection margin for ICs connected to the same rail.
Is SMBJ51CAHE3_B/I suitable for automotive applications?
Yes, SMBJ51CAHE3_B/I is AEC-Q101 qualified, as confirmed by the "HE3" suffix and documentation in Vishay's official datasheet. It operates from -55 °C to +150 °C, meets MSL Level 1 reflow requirements (260 °C peak), and is rated for 600 W surge handling - making it appropriate for automotive body control modules, sensor interfaces, and infotainment power rails where reliability under thermal and electrical stress is critical.
What does the "CA" suffix indicate in SMBJ51CAHE3_B/I?
The "CA" suffix in SMBJ51CAHE3_B/I denotes a bidirectional configuration, meaning the device functions identically in both polarities - unlike unidirectional variants (e.g., SMBJ51A) that conduct only in reverse bias. This enables symmetric transient suppression on AC-coupled lines, floating buses, or differential pairs without polarity concerns, and eliminates the need for orientation-aware placement during SMT assembly.
How does the SMBJ51CAHE3_B/I package compare to SMAJ or SMCJ equivalents?
SMBJ51CAHE3_B/I uses the SMB (DO-214AA) package - larger than SMAJ's SMA (DO-214AC) but smaller than SMCJ's SMC (DO-214AB). Its 4.57 mm × 3.94 mm footprint offers better thermal dissipation (RθJA = 100 °C/W) than SMAJ (140 °C/W) while maintaining compatibility with standard pick-and-place equipment. Unlike SMCJ, it avoids oversized land patterns, balancing surge capability and board space efficiency for mid-power protection.
What is the reverse leakage current specification for SMBJ51CAHE3_B/I at its working voltage?
At its maximum standoff voltage (VWM = 51 V) and TA = 25 °C, SMBJ51CAHE3_B/I exhibits a maximum reverse leakage current (ID) of 1.0 µA, as specified in Vishay's datasheet Table "ELECTRICAL CHARACTERISTICS". This low leakage ensures minimal standby power loss and prevents false triggering in high-impedance circuits such as sensor bias networks or battery-powered monitoring nodes.
SMBJ51CAHE3_B/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:
- 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/I FAQ
1.How can I place an order for SMBJ51CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CAHE3_B/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 SMBJ51CAHE3_B/I reliable?
The price and inventory of SMBJ51CAHE3_B/I 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/I is usually 5 days.
3.What payment methods are accepted for SMBJ51CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CAHE3_B/I?
SMBJ51CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CAHE3_B/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 SMBJ51CAHE3_B/I?
For technical support, including SMBJ51CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CAHE3_B/I requirements.
6.How does Aetrix verify that SMBJ51CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ51CAHE3_B/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 SMBJ51CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ51CAHE3_B/I?
All SMBJ51CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CAHE3_B/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 SMBJ51CAHE3_B/I part is unused and in its original packaging.
Return procedure for SMBJ51CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CAHE3_B/I Tags
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