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Vishay General Semiconductor - Diodes Division SMBJ12CAHE3_B/I
- Part No.:
- SMBJ12CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CAHE3_B/I.pdf
- Description:
- 600W,12V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,096
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Product details
Overview
SMBJ12CAHE3_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 or power lines. It features a 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage at 30.2 A peak pulse current (10/1000 µs), and 600 W peak pulse power dissipation - deployed to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ12CAHE3_B/I datasheet, SMBJ12CAHE3_B/I pinout, SMBJ12CAHE3_B/I application, or SMBJ12CAHE3_B/I equivalent, this device is evaluated for ESD and surge protection in bidirectional AC-coupled interfaces, low-capacitance signal line guarding, automotive-grade transient suppression per AEC-Q101, and high-reliability board-level protection where UL 497B recognition and MSL Level 1 assembly compatibility are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified between 13.3 V and 14.7 V at 1.0 mA test current. Its clamping behavior is defined under standardized 10/1000 µs surge waveform conditions, delivering consistent 19.9 V VC at IPPM = 30.2 A while maintaining low incremental surge resistance and sub-nanosecond response time.
The device is AEC-Q101 qualified (HE3 suffix), RoHS-compliant, and rated for -55 °C to +150 °C junction temperature. Its SMB package supports automated placement, meets UL 94 V-0 flammability, and uses matte tin-plated leads solderable per J-STD-002 - enabling robust reflow compatibility without whisker risk (JESD 201 Class 2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 13.3–14.7 V at 1.0 mA - Confirmed bidirectional avalanche onset range; ensures symmetrical protection in AC or floating circuits. |
| VC (Clamping Voltage) | 19.9 V at 30.2 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; enables safe interface with 24 V logic or 15 V supply rails. |
| PPPM (Peak Pulse Power) | 600 W - Sustained transient energy handling capability under standard IEC 61000-4-5 surge profile; validates robustness against lightning-induced surges. |
| ID (Max Reverse Leakage) | 5.0 µA at VWM - Ultra-low DC leakage preserves signal integrity and battery life in always-on sensor interfaces. |
| TJ max. | +150 °C - Enables operation in under-hood automotive or high-ambient industrial environments without thermal derating penalties. |
| Package | SMB (DO-214AA) - Industry-standard 2-pin surface-mount outline (5.21 mm × 4.06 mm × 2.20 mm); compatible with standard pick-and-place and reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminal function.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve identical bidirectional avalanche paths; no cathode band marking - eliminates orientation errors during placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional 600 W surge rating | Enables single-device protection of AC-coupled lines (e.g., RS-485, CAN, audio) without external polarity management. |
| AEC-Q101 qualification (HE3 suffix) | Validates reliability for automotive infotainment, body control modules, and ADAS sensor interfaces requiring extended temperature and lifetime validation. |
| UL 497B recognized (QVGQ2) | Meets safety agency requirements for telecom and industrial communication ports - reduces certification burden for end-equipment. |
| MSL Level 1, 260 °C peak reflow | Supports lead-free reflow without moisture sensitivity concerns - eliminates bake-out steps and improves manufacturing yield. |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes overvoltage stress on downstream components - critical for protecting 12 V-rated microcontrollers and analog front-ends. |
Applications
| Industrial Sensor Interface Protection | Automotive CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop sensors and analog voltage outputs from switching transients in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and return lines to clamp ±1 kV EFT bursts per IEC 61000-4-4. Use Value: Maintains signal accuracy with <5 µA leakage at 12 V, while limiting transient overshoot to ≤19.9 V - preserving ADC input range and isolation barrier integrity. |
Use Scenario: Guarding high-speed CAN FD physical layer transceivers against load-dump and jump-start induced surges in vehicle ECUs. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp on CANH/CANL differential pair, compliant with ISO 16750-2 pulse 5a/b. Use Value: AEC-Q101 qualification and 150 °C TJ max ensure uninterrupted bus operation during under-hood thermal cycling and repeated 40 V/100 ms load-dump events. |
| Telecom Line Card Surge Protection | Consumer USB Port ESD Guarding |
|
Use Scenario: Front-end protection of Ethernet PHYs and PoE injectors against lightning-induced surges on RJ-45 interfaces. IC Role / Device Role / Timing Role: Primary TVS stage on data pairs, coordinated with GDT secondary protection per ITU-T K.21/K.45. Use Value: UL 497B recognition and 600 W PPPM enable compliance with GR-1089-CORE Level 4 telecom surge immunity without additional crowbar circuitry. |
Use Scenario: Board-level ESD safeguard for USB 2.0 D+/D− lines in smart home hubs and portable media devices. IC Role / Device Role / Timing Role: Fast-response (<1 ns) bidirectional clamp absorbing ±15 kV contact discharge per IEC 61000-4-2. Use Value: SMB footprint minimizes PCB area vs. SO-8 alternatives; low clamping voltage prevents USB transceiver latch-up during repeated ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA-E3/52 | Commercial-grade (non-AEC-Q101), same electrical specs and SMB package. | Lacks automotive qualification; suitable for industrial/commercial designs without automotive lifecycle or reliability mandates. | Select when AEC-Q101 is not required and cost optimization is prioritized. |
| SMCJ12CAHE3_A/H | Higher-power 1500 W version in larger SMC (DO-214AB) package; identical VWM/VC but 72.4 A IPPM. | Used where higher surge margin is needed (e.g., outdoor telecom cabinets), but requires larger PCB footprint and layout revision. | Choose only if system-level testing confirms need for >600 W rating - avoid overdesign in space-constrained consumer applications. |
Compared with SMBJ12CA-E3/52, SMBJ12CAHE3_B/I adds AEC-Q101 qualification and UL 497B recognition without altering clamping performance; versus SMCJ12CAHE3_A/H, it trades 2.5× surge capacity for 40% smaller PCB area and full drop-in compatibility with existing SMB layouts.
Availability
SMBJ12CAHE3_B/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive CAN bus nodes, telecom line cards, and consumer USB port protection requiring stable component supply across multi-year production cycles.
Supply support for SMBJ12CAHE3_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, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets board-level transient protection across automotive, industrial, and telecom markets - engineered for high surge robustness, low clamping, and seamless integration into automated SMT assembly lines.
FAQ
What is the clamping voltage of SMBJ12CAHE3_B/I at its rated peak pulse current?
The SMBJ12CAHE3_B/I has a maximum clamping voltage (VC) of 19.9 V at 30.2 A peak pulse current under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - ensuring compatibility with 12 V nominal systems and preventing damage to downstream ICs or MOSFETs. The SMBJ12CAHE3_B/I maintains this clamping performance across its full operating temperature range.
Is SMBJ12CAHE3_B/I suitable for automotive applications?
Yes, SMBJ12CAHE3_B/I is AEC-Q101 qualified (indicated by the HE3 suffix) and rated for junction temperatures from -55 °C to +150 °C - making it suitable for under-hood and cabin ECU applications including CAN bus protection, sensor interface guarding, and infotainment power rail clamping. Its UL 497B recognition further supports use in automotive telecom and telematics modules requiring safety agency approval. The SMBJ12CAHE3_B/I meets all stress-test requirements defined in the AEC-Q101 standard for transient suppressors.
How does the bidirectional design of SMBJ12CAHE3_B/I affect its circuit implementation?
The bidirectional design of SMBJ12CAHE3_B/I means it provides symmetrical clamping in both polarities - eliminating the need for polarity awareness during placement and enabling direct use across AC-coupled or floating signal lines such as RS-485, CAN, or audio interfaces. Unlike unidirectional TVS diodes, SMBJ12CAHE3_B/I has no cathode marking and functions identically regardless of voltage polarity, simplifying schematic symbol usage and reducing BOM complexity. This symmetry is confirmed by identical VBR min/max values in both directions per the Vishay datasheet.
What is the maximum reverse leakage current for SMBJ12CAHE3_B/I at its stand-off voltage?
The SMBJ12CAHE3_B/I exhibits a maximum reverse leakage current (ID) of 5.0 µA at its 12 V stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and extends battery life in always-on IoT endpoints. The specification remains valid across the full -55 °C to +125 °C ambient operating range, with leakage increasing predictably per the device's temperature coefficient - a key advantage over higher-leakage alternatives in precision analog applications.
Does SMBJ12CAHE3_B/I require special PCB layout considerations?
Yes - to achieve rated 600 W surge performance, SMBJ12CAHE3_B/I must be mounted on minimum recommended copper pad areas: 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal, per Vishay's datasheet Figure 2 derating curve. Smaller pads reduce thermal mass and increase junction temperature during surge events, degrading clamping consistency and shortening device life. The SMBJ12CAHE3_B/I also benefits from short, wide traces to minimize inductance between the TVS and protected node - especially critical for high-frequency ESD transients.
SMBJ12CAHE3_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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 30.2A
- 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)
SMBJ12CAHE3_B/I FAQ
1.How can I place an order for SMBJ12CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CAHE3_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 SMBJ12CAHE3_B/I reliable?
The price and inventory of SMBJ12CAHE3_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 SMBJ12CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ12CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CAHE3_B/I?
SMBJ12CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CAHE3_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 SMBJ12CAHE3_B/I?
For technical support, including SMBJ12CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CAHE3_B/I requirements.
6.How does Aetrix verify that SMBJ12CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ12CAHE3_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 SMBJ12CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ12CAHE3_B/I?
All SMBJ12CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CAHE3_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 SMBJ12CAHE3_B/I part is unused and in its original packaging.
Return procedure for SMBJ12CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CAHE3_B/I Tags
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