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Vishay General Semiconductor - Diodes Division SMB8J12CAHE3_A/H
- Part No.:
- SMB8J12CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J12CAHE3_A/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,093
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Product details
Overview
SMB8J12CAHE3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage (VC) at 40.2 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J12CAHE3_A/H datasheet, SMB8J12CAHE3_A/H pinout, SMB8J12CAHE3_A/H application, or SMB8J12CAHE3_A/H equivalent, key selection criteria include AEC-Q101 qualification, bidirectional polarity, low clamping ratio (VC/VWM = 1.66), and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ps to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior, while the bidirectional configuration enables symmetric suppression of positive and negative surges without polarity sensitivity.
Designed for automotive-grade reliability, SMB8J12CAHE3_A/H meets AEC-Q101 stress tests including temperature cycling, humidity bias, and mechanical shock. Its MSL Level 1 rating (260 °C peak reflow) and matte tin-plated leads support lead-free soldering per J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min / max | 13.3 V / 14.7 V at 1 mA - Confirmed breakdown threshold range under standardized test conditions |
| VC @ IPPM | 19.9 V at 40.2 A - Clamping voltage during 10/1000 µs surge, limiting downstream voltage stress |
| PPPM | 800 W - Peak transient energy absorption capability per single event |
| ID @ VWM | 5 µA - Reverse leakage current at rated stand-off voltage, minimizing standby power loss |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 3.94 mm footprint and 2.20 mm height |
Pinout & Package
Two-terminal device in SMB (DO-214AA) package; no polarity marking for bidirectional types. Terminals are matte tin-plated leads compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Surge current path | Bidirectional conduction allows identical clamping for ± transients; no orientation required during placement |
| Case (cathode band absent) | Thermal and mechanical interface | Exposed metal slug provides thermal path to PCB copper; no cathode marking confirms bidirectional identity |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes overvoltage exposure to protected ICs such as CAN transceivers or ADC front-ends |
| MSL Level 1, 260 °C peak | Enables single-pass lead-free reflow without moisture-induced damage |
| Glass-passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift |
| UL 94 V-0 molding compound | Meets flammability requirements for enclosed industrial and automotive enclosures |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus and analog sensor inputs (e.g., pressure, temperature) in engine control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point to clamp surges before reaching MCU or signal conditioner. Use Value: Limits voltage to ≤19.9 V during 40.2 A transients, preserving integrity of 12 V rail-connected sensors and avoiding latch-up in 3.3 V/5 V interface ICs. | Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Bidirectional clamping element across 24 V DC input terminals to absorb both positive and negative switching spikes. Use Value: Withstands repetitive 800 W surges while maintaining <5 µA leakage at 12 V nominal, ensuring reliable state detection without false triggering. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Surge protection on RS-485 differential pairs in base station remote units subjected to lightning-induced common-mode transients. IC Role / Device Role / Timing Role: Paired SMB8J12CAHE3_A/H devices (one per line) referenced to ground to clamp mode-specific overvoltages. Use Value: Achieves sub-20 V clamping at 40 A, meeting ITU-T K.21 basic protection level for outdoor telecom equipment. | Use Scenario: Input protection for microcontroller-based washing machine control boards handling triac-triggered motor drivers and door switch bounce. IC Role / Device Role / Timing Role: Front-end TVS on 12 V supply rail feeding MCU and optocouplers, absorbing commutation spikes from universal motors. Use Value: AEC-Q101 qualification ensures long-term reliability under thermal cycling and vibration, critical for white goods field life. |
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 | Same VWM (12 V), VC (23.2 V), but lower PPPM (600 W); commercial-grade, non-AEC-Q101 | Lacks automotive qualification; suitable for industrial/commercial designs without automotive lifecycle requirements | Select when AEC-Q101 is not mandated and cost optimization is prioritized |
| SMCJ12CAHE3_A/H | Same VWM and polarity, but larger SMC (DO-214AB) package; higher PPPM (1500 W), higher IPPM (123 A) | Requires larger PCB area; used where higher surge margin is needed beyond 800 W | Select when system-level surge testing exceeds IEC 61000-4-5 Level 4 and board space permits |
Compared with SMBJ12CA-E3/52, SMB8J12CAHE3_A/H delivers AEC-Q101 assurance and tighter clamping (19.9 V vs. 23.2 V); versus SMCJ12CAHE3_A/H, it trades 700 W surge headroom for 30% smaller footprint - ideal for space-constrained automotive ECUs.
Availability
SMB8J12CAHE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMB8J12CAHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMB8J series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of SMB8J12CAHE3_A/H at its rated peak pulse current?
The SMB8J12CAHE3_A/H has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current (IPPM) of 40.2 A using a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures predictable overvoltage limiting for protected circuitry. The SMB8J12CAHE3_A/H maintains this clamping performance across its qualified operating temperature range.
Is SMB8J12CAHE3_A/H suitable for automotive applications?
Yes, SMB8J12CAHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix. It undergoes stress testing for temperature cycling, humidity bias, and mechanical shock per AEC-Q101 Rev D. The SMB8J12CAHE3_A/H is commonly deployed in engine control units, body control modules, and ADAS sensor interfaces where robust transient immunity is mandatory.
What does the "CA" suffix indicate in SMB8J12CAHE3_A/H?
The "CA" suffix in SMB8J12CAHE3_A/H denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMB8J12A), SMB8J12CAHE3_A/H has no cathode marking and functions identically regardless of terminal orientation, simplifying layout and assembly.
What is the thermal resistance of SMB8J12CAHE3_A/H from junction to ambient?
The typical thermal resistance from junction to ambient (RθJA) for SMB8J12CAHE3_A/H is 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard JEDEC test conditions and guides thermal design for sustained surge duty cycles. For improved heat dissipation, designers may increase pad area or add thermal vias - the SMB8J12CAHE3_A/H's RθJL of 20 °C/W supports efficient conduction to the PCB.
How does SMB8J12CAHE3_A/H differ from SMBJ12CAHE3_A/H?
SMB8J12CAHE3_A/H and SMBJ12CAHE3_A/H share identical electrical specifications (VWM = 12 V, VC = 19.9 V, PPPM = 800 W), but differ in surge current rating: SMB8J12CAHE3_A/H specifies IPPM = 40.2 A, while SMBJ12CAHE3_A/H specifies IPPM = 32.9 A. This reflects distinct test condition interpretations in Vishay's documentation - SMB8J12CAHE3_A/H uses the 800 W rating directly to derive IPPM, confirming its suitability for higher-current transient events.
SMB8J12CAHE3_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):
- 40.2A
- Power - Peak Pulse:
- 800W
- 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 (SMB)
SMB8J12CAHE3_A/H FAQ
1.How can I place an order for SMB8J12CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J12CAHE3_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 SMB8J12CAHE3_A/H reliable?
The price and inventory of SMB8J12CAHE3_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 SMB8J12CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J12CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J12CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J12CAHE3_A/H?
SMB8J12CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J12CAHE3_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 SMB8J12CAHE3_A/H?
For technical support, including SMB8J12CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J12CAHE3_A/H requirements.
6.How does Aetrix verify that SMB8J12CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J12CAHE3_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 SMB8J12CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J12CAHE3_A/H?
All SMB8J12CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J12CAHE3_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 SMB8J12CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMB8J12CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J12CAHE3_A/H Tags
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