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Vishay General Semiconductor - Diodes Division SMBJ51CAHE3/5B
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- Part No.:
- SMBJ51CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CAHE3/5B.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,764
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Product details
Overview
SMBJ51CAHE3/5B 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 power and signal lines. It features a 51 V stand-off voltage (VWM), 600 W peak pulse power (10/1000 µs), clamping voltage of 82.4 V at 7.3 A peak pulse current, and operates across -55 °C to +150 °C junction temperature - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ51CAHE3/5B datasheet, SMBJ51CAHE3/5B pinout, SMBJ51CAHE3/5B application, or SMBJ51CAHE3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compliance with UL 497B surge protector classification.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ns), low incremental surge resistance, and stable breakdown behavior under repetitive 10/1000 µs transients. Its bidirectional architecture enables symmetrical clamping in AC-coupled or floating circuits without polarity constraints.
The device is rated for 600 W peak pulse power at TA = 25 °C, derated linearly above 25 °C per Fig. 2, and supports 100 A non-repetitive forward surge (IFSM) only in unidirectional variants - not applicable to SMBJ51CAHE3/5B due to its bidirectional configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min / max | 56.7 V / 62.7 V at 1 mA - verified breakdown threshold range ensuring reliable turn-on margin |
| VC @ IPPM | 82.4 V at 7.3 A - clamped voltage during full 600 W transient, defining protected circuit stress level |
| PPPM | 600 W - peak pulse power handling with 10/1000 µs waveform, duty cycle ≤ 0.01 % |
| TJ max | +150 °C - maximum junction temperature enabling operation in high-ambient industrial environments |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads |
| UL Recognition | QVGQ2 file E136766 - certified per UL 497B for telecom and data line surge protection |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, MSL Level 1 (JEDEC J-STD-020), 260 °C reflow peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 | One side of bidirectional junction - no polarity marking; symmetric conduction in either direction |
| Cathode | Terminal 2 | Terminal 2 - identical electrical role as Anode in bidirectional configuration; device has no functional polarity |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled, differential, or floating signal/power rails without polarity alignment |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| 600 W peak pulse rating | Withstands IEC 61000-4-5 surge events up to 4 kV (line-earth) when properly laid out |
| Low clamping ratio (VC/VBR) | 1.45 typical - minimizes overvoltage stress on downstream ICs during transient suppression |
| UL 497B recognition | Meets safety requirements for telecom/data line protectors, simplifying end-equipment certification |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting analog output (4–20 mA) and digital I/O lines of PLC modules from inductive switching transients and ESD. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector entry point to clamp ±1 kV EFT and ±4 kV contact ESD per IEC 61000-4-2/4. Use Value: Limits voltage excursion to ≤82.4 V, preventing damage to precision op-amps and ADC front-ends while maintaining signal integrity. |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level surge suppressor in hybrid protection circuits with GDTs and PTCs. Use Value: Responds in <1 ns to divert >7 A transient current, reducing let-through energy to safe levels for secondary protection stages. |
| Automotive Body Control Module | Consumer Power Adapter Input |
|
Use Scenario: Safeguarding LIN bus and switched 12 V supply lines in door modules and lighting controllers. IC Role / Device Role / Timing Role: AEC-Q101-qualified transient suppressor meeting ISO 7637-2 Pulse 1/2a/3a immunity requirements. Use Value: Sustains repeated load-dump transients up to 35 V/100 ms without degradation, preserving MCU and driver IC lifetime. |
Use Scenario: Input-stage overvoltage protection for universal-input AC/DC adapters used in smart home devices. IC Role / Device Role / Timing Role: Secondary clamping device after MOV-based primary surge suppression. Use Value: Provides precise 51 V clamping with low leakage (<1 µA), avoiding standby power loss while blocking 1.2/50 µs surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA-M3/5B | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification | No difference in circuit design or layout - direct material substitution for halogen-free BOMs | Select when compliance with JEDEC J-STD-201 Class 2 whisker resistance and halogen-free requirements is mandatory |
| SAC51CA | Same VWM/VC but lower PPPM (400 W); SOD-123FL package (smaller footprint, higher RθJA) | Not suitable for high-energy surges; limited to low-power signal lines with <400 W threat profile | Choose only for space-constrained consumer applications where 600 W rating is unnecessary and thermal budget allows higher RθJA |
Compared with SMBJ51CAHE3/5B, SMBJ51CA-M3/5B offers identical performance with halogen-free construction, while SAC51CA trades pulse power and thermal capability for reduced size - making the HE3/5B optimal for industrial and automotive designs requiring full 600 W surge margin and AEC-Q101 validation.
Availability
SMBJ51CAHE3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and automotive body control modules requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified surge suppression.
Supply support for SMBJ51CAHE3/5B 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 and application-specific optimization.
The SMBJ series targets board-level transient protection in harsh environments, combining high pulse power, automotive qualification, and standardized SMB packaging for automated assembly and thermal management.
FAQ
What is the clamping voltage of SMBJ51CAHE3/5B at its rated peak pulse current?
The SMBJ51CAHE3/5B 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 under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during a full-rated transient event. The SMBJ51CAHE3/5B maintains this clamping performance across its operational temperature range and is validated per IEC 61000-4-5 surge testing protocols.
Is SMBJ51CAHE3/5B suitable for automotive applications?
Yes, SMBJ51CAHE3/5B is AEC-Q101 qualified and explicitly listed in Vishay's automotive ordering codes (HE3 suffix). It meets stress tests including temperature cycling, highly accelerated life testing (HALT), and ESD per ISO 10605. The SMBJ51CAHE3/5B is deployed in body control modules, LIN bus nodes, and lighting drivers where sustained operation at 150 °C junction temperature and immunity to load-dump pulses are required.
Does SMBJ51CAHE3/5B have polarity markings on the package?
No, SMBJ51CAHE3/5B does not feature polarity markings because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SMBJ51A), the CA suffix indicates symmetrical breakdown behavior - both terminals function identically as anode/cathode depending on instantaneous voltage polarity. The SMBJ51CAHE3/5B may be mounted without orientation concern in AC or floating circuits.
What is the maximum reverse leakage current of SMBJ51CAHE3/5B at its stand-off voltage?
At its 51 V stand-off voltage (VWM) and TA = 25 °C, the SMBJ51CAHE3/5B exhibits a maximum reverse leakage current (ID) of 1.0 µA. This low leakage ensures minimal power loss in always-on systems and avoids false triggering in high-impedance sensing paths. The SMBJ51CAHE3/5B maintains leakage below 5 µA even at elevated temperatures up to 125 °C.
How does the thermal resistance of SMBJ51CAHE3/5B affect PCB layout?
The SMBJ51CAHE3/5B 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. To maintain safe junction temperatures during repetitive surges, PCB layout must provide adequate copper area and avoid thermal bottlenecks - the SMBJ51CAHE3/5B requires minimum pad dimensions matching the SMB outline and direct thermal vias to inner ground planes for high-duty-cycle applications.
SMBJ51CAHE3/5B 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:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ51CAHE3/5B FAQ
1.How can I place an order for SMBJ51CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CAHE3/5B 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 SMBJ51CAHE3/5B reliable?
The price and inventory of SMBJ51CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ51CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CAHE3/5B?
SMBJ51CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CAHE3/5B 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 SMBJ51CAHE3/5B?
For technical support, including SMBJ51CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CAHE3/5B requirements.
6.How does Aetrix verify that SMBJ51CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ51CAHE3/5B 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 SMBJ51CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ51CAHE3/5B?
All SMBJ51CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CAHE3/5B, 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 SMBJ51CAHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ51CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CAHE3/5B Tags
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