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Vishay General Semiconductor - Diodes Division SMB8J12CAHE3/52
- Part No.:
- SMB8J12CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J12CAHE3/52.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,823
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Product details
Overview
SMB8J12CAHE3/52 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, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMB8J12CAHE3/52 datasheet, SMB8J12CAHE3/52 pinout, SMB8J12CAHE3/52 application, or SMB8J12CAHE3/52 equivalent, this AEC-Q101 qualified TVS offers validated bidirectional clamping performance, low leakage (<5 μA at VWM), and MSL Level 1 moisture sensitivity - critical for under-hood automotive designs, CAN bus transceiver protection, and high-reliability industrial control systems.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection against ESD, lightning-induced surges, and inductive switching transients without polarity constraints. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, while the 72 °C/W junction-to-ambient thermal resistance supports sustained operation up to +150 °C junction temperature.
The device complies with ANSI/IEEE C62.35 standards for transient suppression and meets JESD201 Class 2 whisker resistance. Its 1.0 mm minimum pad layout and matte tin-plated leads ensure compatibility with automated SMT assembly and IPC-A-610 Class 2/3 soldering requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - reverse stand-off voltage; defines maximum continuous operating voltage before clamping begins |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - guaranteed breakdown voltage window ensuring consistent turn-on threshold |
| VC @ IPPM | 19.9 V at 40.2 A - clamping voltage during 10/1000 μs surge; limits downstream voltage stress to safe levels |
| PPPM | 800 W - peak pulse power handling capability; determines survivability against IEC 61000-4-5 Level 4 surges |
| ID @ VWM | <5 μA - ultra-low reverse leakage; preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - maximum junction temperature; enables deployment in under-hood automotive environments |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm × 3.94 mm footprint and 2.20 mm height |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical terminals suitable for AC-coupled or floating signal lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts surge current in either direction when voltage exceeds ±13.3 V |
| Case (exposed cathode band area) | Thermal and mechanical interface | No electrical connection; provides mechanical anchoring and contributes to thermal dissipation via PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking - simplifies high-volume SMT manufacturing |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation material required for safety-critical automotive and industrial enclosures |
| Matte tin plating | RoHS-compliant, whisker-resistant terminations meeting J-STD-002 and JESD22-B102 solderability standards |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load-dump and jump-start transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching ASIC or microcontroller pins. Use Value: Limits voltage excursion to ≤19.9 V during 40.2 A surge, preventing latch-up or gate oxide damage in 5 V/12 V automotive ICs. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field wiring exposed to relay coil flyback and EMI coupling. IC Role / Device Role / Timing Role: Primary transient suppressor mounted adjacent to terminal block to clamp induced spikes before optocoupler or level-shifter inputs. Use Value: Withstands repetitive 800 W surges while maintaining <5 μA leakage - avoids false triggering and preserves input logic thresholds. |
| Telecom Line Interface | Consumer Power Adapter Output |
|
Use Scenario: Shielding Ethernet PHY magnetics secondary side and RS-485 transceiver lines from ESD and lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Symmetrical bidirectional TVS bridging differential pair to ground, leveraging matched VBR for balanced clamping. Use Value: Delivers 19.9 V clamping at 40.2 A with sub-1 ns response - meets IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) requirements. |
Use Scenario: Secondary-side overvoltage suppression on 12 V USB-C PD adapter outputs to protect connected devices during regulation fault conditions. IC Role / Device Role / Timing Role: Final-stage crowbar-style protector placed after DC-DC post-regulator to clamp output excursions beyond 12 V nominal. Use Value: 12 V VWM aligns precisely with adapter output tolerance; 19.9 V VC ensures connected devices remain within absolute maximum ratings. |
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 | Unqualified for automotive use; no AEC-Q101 certification; same VWM/VC but lower PPPM (600 W vs. 800 W) | Limited to commercial-grade consumer or industrial equipment without automotive qualification requirements | Select when cost sensitivity outweighs automotive reliability needs and surge energy remains below 600 W |
| SMCJ12CAHE3/52 | Same AEC-Q101 qualification but larger SMC (DO-214AB) package; higher PPPM (1500 W) and IPPM (123 A) | Used where higher surge margin is required, but board space and thermal mass allow larger footprint | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and PCB layout permits 7.11 mm × 6.22 mm footprint |
Compared with SMBJ12CA-E3/52 and SMCJ12CAHE3/52, SMB8J12CAHE3/52 delivers optimal balance of automotive qualification, 800 W surge capacity, and compact SMB footprint - making it the preferred choice for space-constrained, AEC-Q101–mandated applications where 600 W is insufficient but SMC size is prohibitive.
Availability
SMB8J12CAHE3/52 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface boards requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J12CAHE3/52 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 reliability, efficiency, and application-specific optimization.
The SMB8J series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, AEC-Q101–compliant transient suppression in automotive and industrial environments where compact size and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMB8J12CAHE3/52 at its rated peak pulse current?
The SMB8J12CAHE3/52 has a maximum clamping voltage (VC) of 19.9 V when subjected to its specified peak pulse current (IPPM) of 40.2 A using the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry sees no more than 19.9 V during surge events - a critical parameter for protecting 12 V-rated ICs and interfaces. The SMB8J12CAHE3/52 maintains this clamping performance across its full operating temperature range.
Is SMB8J12CAHE3/52 suitable for automotive applications?
Yes, SMB8J12CAHE3/52 is explicitly AEC-Q101 qualified, with test documentation covering HTGB, H3TRB, TC, and ESD per the standard's stress test plan. Its RoHS-compliant HE3 suffix and MSL Level 1 rating further validate its suitability for automotive under-hood and cabin applications. The SMB8J12CAHE3/52 is commonly used in body control modules, ADAS sensor interfaces, and infotainment power rails where certified reliability is mandatory.
How does SMB8J12CAHE3/52 differ from unidirectional variants like SMB10J12AHE3/52?
The SMB8J12CAHE3/52 is bidirectional with symmetrical clamping in both polarities (±13.3 V to ±14.7 V breakdown), whereas SMB10J12AHE3/52 is unidirectional and only clamps in reverse bias. SMB8J12CAHE3/52 supports AC-coupled or floating signal lines such as RS-485 or Ethernet pairs, while SMB10J12AHE3/52 is intended for DC-biased rails like 12 V power supplies. Additionally, SMB8J12CAHE3/52 delivers 800 W PPPM versus 1000 W for the unidirectional SMB10J12AHE3/52.
What is the thermal resistance of SMB8J12CAHE3/52, and how does it affect layout design?
The SMB8J12CAHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value informs PCB copper pour sizing: reducing RθJA requires increasing pad area or adding thermal vias. For continuous surge duty, designers must ensure the SMB8J12CAHE3/52's junction temperature stays below +150 °C - achievable with ≥5 mm² copper per pad and minimal trace length between device and ground plane.
Does SMB8J12CAHE3/52 require special handling or baking prior to reflow?
No, SMB8J12CAHE3/52 is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and may be reflowed at a peak temperature of 260 °C without pre-baking. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the UL 94 V-0 molding compound withstands standard lead-free reflow profiles. This eliminates process steps and reduces risk of moisture-related defects - a key advantage for high-throughput automotive electronics manufacturing where SMB8J12CAHE3/52 is frequently deployed.
SMB8J12CAHE3/52 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):
- 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)
SMB8J12CAHE3/52 FAQ
1.How can I place an order for SMB8J12CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J12CAHE3/52 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 SMB8J12CAHE3/52 reliable?
The price and inventory of SMB8J12CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J12CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J12CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J12CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J12CAHE3/52?
SMB8J12CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J12CAHE3/52 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 SMB8J12CAHE3/52?
For technical support, including SMB8J12CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J12CAHE3/52 requirements.
6.How does Aetrix verify that SMB8J12CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J12CAHE3/52 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 SMB8J12CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J12CAHE3/52?
All SMB8J12CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J12CAHE3/52, 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 SMB8J12CAHE3/52 part is unused and in its original packaging.
Return procedure for SMB8J12CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J12CAHE3/52 Tags
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