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Vishay General Semiconductor - Diodes Division SMBJ12CAHE3_A/H
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- Part No.:
- SMBJ12CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CAHE3_A/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,700
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Product details
Overview
SMBJ12CAHE3_A/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 or power lines. It features 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 rating - deployed in industrial sensor interfaces and automotive ECUs to protect MOSFETs and ICs from ESD and inductive switching surges.
For engineers reviewing the SMBJ12CAHE3_A/H datasheet, SMBJ12CAHE3_A/H pinout, SMBJ12CAHE3_A/H application, or SMBJ12CAHE3_A/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance data, clamping behavior under surge conditions, and direct alternative part comparisons for robust overvoltage protection design-in.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) of 13.3–14.7 V at 1 mA test current and reverse leakage ≤5.0 μA at 12 V stand-off. Its low clamping ratio (VC/VWM ≈ 1.66) and fast response time (<1 ns) enable effective suppression of fast-rising transients such as ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4).
Thermally, it exhibits RθJA = 100 °C/W and RθJL = 20 °C/W, supporting operation up to TJ = +150 °C. The device is AEC-Q101 qualified (suffix HE3), RoHS-compliant, and rated for MSL Level 1 reflow (260 °C peak), making it suitable for automotive front-end and industrial control board deployments requiring long-term reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - Maximum continuous reverse working voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 13.3–14.7 V at IT = 1 mA - Confirmed bidirectional avalanche onset range; ensures symmetrical protection behavior. |
| VC (Clamping Voltage) | 19.9 V at IPPM = 30.2 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; determines safe voltage headroom for downstream ICs. |
| PPPM (Peak Pulse Power) | 600 W - Sustained transient energy absorption capability under standardized 10/1000 μs waveform; validates robustness against lightning-induced surges. |
| ID (Reverse Leakage) | ≤5.0 μA at VWM = 12 V - Minimal standby power loss and signal integrity impact in high-impedance sensing paths. |
| TJ max. | +150 °C - Enables use in under-hood automotive modules and industrial enclosures without derating at ambient ≤125 °C. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per AEC-Q101 Rev D. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case with matte tin-plated leads; dimensions 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (Bidirectional) | Non-polarized terminals | No polarity marking; symmetric conduction in both directions - simplifies PCB layout and eliminates orientation errors during automated placement. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 3 (1 kV line-to-line, 2 kV line-to-earth) surge immunity without external series impedance. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive powertrain and body electronics where field failure risk must be minimized over 15-year service life. |
| Low clamping voltage (19.9 V @ 30.2 A) | Provides ≥2.1 V margin below typical 24 V rail overvoltage limits, protecting 20 V-rated gate drivers and microcontrollers. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Ensures stable VBR and low leakage over temperature and lifetime, critical for precision analog sensor front-ends. |
Applications
| Automotive Body Control Module (BCM) | Industrial CAN Bus Interface |
|---|---|
|
Use Scenario: Protecting LIN and CANH/CANL lines from load dump and alternator ripple in vehicle door modules and seat controllers. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point, shunting transients before reaching transceiver ICs. Use Value: Prevents latch-up and permanent damage to NXP TJA1042 or ST TSN8251 transceivers during ISO 7637-2 Pulse 5a (load dump) events. |
Use Scenario: Shielding RS-485 and CAN FD physical layer circuits in programmable logic controllers (PLCs) exposed to motor drive noise. IC Role / Device Role / Timing Role: Low-capacitance TVS placed differential across bus lines to suppress common-mode surges without distorting signal edges. Use Value: Maintains signal integrity up to 5 Mbps CAN FD rates while limiting bus voltage to <20 V during 4 kV EFT bursts per IEC 61000-4-4. |
| Consumer Appliance Motor Drive Board | Telecom Power Supply Input Stage |
|
Use Scenario: Safeguarding gate drivers and MCU I/O pins in washing machine inverter boards subject to brush-commutator arcing. IC Role / Device Role / Timing Role: Parallel-connected TVS across half-bridge FET source-drain nodes to clamp inductive kickback during PWM switching. Use Value: Limits drain-source voltage spikes to <20 V, preventing avalanche overstress on 30 V-rated STP30NF20 MOSFETs during 100 kHz PWM transitions. |
Use Scenario: Front-end transient suppression on 48 V telecom rectifier outputs feeding PoE injectors and baseband processors. IC Role / Device Role / Timing Role: Primary-level TVS mounted at DC input connector to absorb lightning-induced surges before bulk capacitors and DC-DC controllers. Use Value: Withstands 600 W surge energy without degradation, enabling compliance with GR-1089-CORE Section 4.5.2.2 (lightning surge) requirements. |
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-M3/52 | Same electrical specs and SMB package; halogen-free, RoHS-compliant, commercial grade (non-AEC-Q101). | Lacks automotive qualification; suitable for industrial and consumer designs not requiring AEC-Q101 traceability. | Select when cost sensitivity outweighs automotive reliability requirements and no temperature cycling validation is mandated. |
| SMCJ12CAHE3_A/H | Same VWM/VC/PPPM specs but in larger SMC (DO-214AB) package; higher thermal mass (RθJA = 60 °C/W vs. 100 °C/W). | Better sustained surge handling in high-temperature environments (>85 °C ambient); requires larger PCB footprint. | Choose when system-level thermal management is constrained and peak pulse repetition rate exceeds SMBJ's derating curve limits. |
Compared with SMBJ12CAHE3_A/H, SMBJ12CA-M3/52 offers identical protection performance without automotive qualification, while SMCJ12CAHE3_A/H trades smaller footprint for superior thermal dissipation - guiding selection based on qualification needs and thermal budget rather than electrical equivalence alone.
Availability
SMBJ12CAHE3_A/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial CAN networks, appliance motor drives, and telecom power supply inputs requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMBJ12CAHE3_A/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 high-reliability, high-efficiency solutions.
The SMBJ series targets board-level transient protection in automotive, industrial, and telecom systems - engineered for fast response, repeatable clamping, and seamless integration into automated SMT assembly lines.
FAQ
What does the "CA" suffix indicate in SMBJ12CAHE3_A/H?
The "CA" suffix denotes a bidirectional configuration: SMBJ12CAHE3_A/H conducts identically in both forward and reverse directions, providing symmetrical clamping for AC-coupled lines or differential buses like CAN or RS-485. This differs from unidirectional "A" variants that require correct polarity orientation and only clamp in reverse bias.
Is SMBJ12CAHE3_A/H suitable for protecting a 12 V automotive power rail?
Yes - SMBJ12CAHE3_A/H has a 12 V stand-off voltage (VWM) and clamps at 19.9 V under 30.2 A surge, delivering 7.9 V of headroom above nominal 12 V. It meets ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 3b (capacitive coupling) requirements when used with appropriate series impedance, and its AEC-Q101 qualification confirms suitability for automotive 12 V systems.
How does the HE3 suffix affect SMBJ12CAHE3_A/H's compliance and reliability?
The HE3 suffix indicates RoHS-compliant construction with AEC-Q101 qualification - validated across temperature cycling, highly accelerated life testing (HALT), and ESD robustness (HBM ≥8 kV). This distinguishes SMBJ12CAHE3_A/H from commercial-grade E3/M3 variants and ensures compliance with automotive OEM reliability mandates for body electronics and ADAS subsystems.
What is the maximum allowable PCB pad size for SMBJ12CAHE3_A/H to achieve rated PPPM?
To achieve the full 600 W peak pulse power rating, SMBJ12CAHE3_A/H must be mounted on minimum recommended copper pads: 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal, per Vishay Document 88392 Figure 2 derating curves. Smaller pads reduce thermal dissipation and require current derating - e.g., 0.1" × 0.1" pads limit IPPM to ~22 A at 25 °C ambient.
Can SMBJ12CAHE3_A/H replace SMBJ12AHE3_A/H in an existing design?
No - SMBJ12CAHE3_A/H is bidirectional, while SMBJ12AHE3_A/H is unidirectional with cathode marking. Substituting them without circuit review risks improper clamping during positive transients on unidirectional rails. If bidirectional protection is required, verify that downstream components tolerate symmetrical conduction; otherwise, retain the unidirectional variant for DC-biased lines.
SMBJ12CAHE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ12CAHE3_A/H FAQ
1.How can I place an order for SMBJ12CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CAHE3_A/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 SMBJ12CAHE3_A/H reliable?
The price and inventory of SMBJ12CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ12CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CAHE3_A/H?
SMBJ12CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CAHE3_A/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 SMBJ12CAHE3_A/H?
For technical support, including SMBJ12CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CAHE3_A/H requirements.
6.How does Aetrix verify that SMBJ12CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ12CAHE3_A/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 SMBJ12CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ12CAHE3_A/H?
All SMBJ12CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CAHE3_A/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 SMBJ12CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMBJ12CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CAHE3_A/H Tags
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