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Vishay General Semiconductor - Diodes Division SMB8J12C-E3/5B
- Part No.:
- SMB8J12C-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J12C-E3/5B.pdf
- Description:
- TVS DIODE 12VWM 22VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,221
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Product details
Overview
SMB8J12C-E3/5B from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for robust overvoltage protection on signal and power lines. It features 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 SMB8J12C-E3/5B datasheet, SMB8J12C-E3/5B pinout, SMB8J12C-E3/5B application, or SMB8J12C-E3/5B equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bi-directional TVS diode operates symmetrically across both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown behavior under repetitive surge stress, and its low incremental surge resistance minimizes voltage overshoot during fast transients.
The device meets J-STD-020 MSL Level 1 (260 °C peak reflow), supports 150 °C maximum junction temperature, and delivers consistent clamping performance across -55 °C to +150 °C operating range - validated per ANSI/IEEE C62.35 standards for surge immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 13.3 V min / 14.7 V max at 1 mA - Ensures reliable triggering within tight tolerance band for predictable surge response |
| VC (Clamping Voltage) | 19.9 V at 40.2 A IPPM - Limits downstream voltage stress during 10/1000 μs surge, protecting 15–20 V-rated ICs |
| PPPM (Peak Pulse Power) | 800 W - Sustains high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without failure |
| ID (Reverse Leakage) | 5 μA max at VWM - Minimizes standby power loss and signal distortion in high-impedance circuits |
| TJ max | 150 °C - Enables deployment in under-hood automotive environments and thermally constrained PCB layouts |
| RθJA | 72 °C/W - Requires minimum 0.2" × 0.2" copper pad per terminal for rated power dissipation |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with no polarity marking - cathode band absent per bi-directional design convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge conduction path | Either terminal serves as anode or cathode depending on transient polarity; no DC bias dependency |
| Case (body) | Non-electrical mechanical interface | Plastic molding provides UL 94 V-0 flammability rating and thermal isolation from adjacent components |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | 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 (260 °C) | Compatible with standard lead-free reflow profiles without preconditioning or baking |
| Matte tin plated leads | Meets J-STD-002 solderability and JESD22-B102 intermetallic growth requirements for long-term joint integrity |
| Low clamping ratio (VC/VWM = 1.66) | Delivers tighter voltage limiting than typical TVS devices, reducing margin needed for protected IC VDD ratings |
Applications
| Automotive Sensor Interface Protection | Industrial RS-485 Transceiver Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus nodes and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional TVS placed directly at connector entry point to clamp ±20 V surges before reaching signal conditioning amplifier or microcontroller input. Use Value: Prevents latch-up or permanent damage to 12 V rail-connected sensors while maintaining signal fidelity due to sub-5 μA leakage at 12 V. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., SN65HVD230) against EFT bursts and lightning-induced surges on field wiring in factory automation systems. IC Role / Device Role / Timing Role: Paired TVS on A/B differential lines to suppress common-mode transients up to ±1 kV (IEC 61000-4-4) without disrupting DC bias or data integrity. Use Value: Maintains <15 ns response time and clamps to ≤20 V, ensuring transceiver remains within absolute maximum ratings during 800 W surge events. |
| Consumer USB Port ESD Protection | Power Supply Input Surge Suppression |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines after primary polymer-based TVS, targeting system-level IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Fast-response bi-directional clamp absorbing residual energy post-primary suppression, placed adjacent to USB controller PHY. Use Value: Achieves <1 ns response with 19.9 V clamping, preventing gate oxide rupture in 3.3 V USB PHYs while adding <0.5 pF capacitance per line. |
Use Scenario: Input-stage transient suppression on 12 V DC power rails feeding motor drivers or LED drivers in smart lighting and HVAC control modules. IC Role / Device Role / Timing Role: Parallel-mounted TVS across bulk capacitor to divert ISO 7637-2 Pulse 5a (500 V/10 Ω) energy away from upstream regulators and downstream loads. Use Value: Handles 40.2 A peak current without degradation, sustaining 800 W surge for 1 ms and preserving 12 V rail stability during load-switching 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-E3/5B | Same DO-214AA package and 12 V VWM, but rated for 1000 W PPPM (uni-directional only); not bi-directional | Requires polarity-aware layout; unsuitable for AC or differential signal lines without external diode pairing | Select only when unidirectional protection suffices and higher 1000 W rating is required |
| SMCJ12CA | DO-214AB (SMC) package, same 12 V VWM and bi-directionality, but 1500 W PPPM and 125 A IPPM | Larger footprint (7.11 × 6.22 mm vs. 4.57 × 3.94 mm); higher thermal mass enables longer surge duration handling | Choose when board space allows and >800 W surge energy must be absorbed without derating |
Compared with SMBJ12CA-E3/5B and SMCJ12CA, SMB8J12C-E3/5B uniquely balances bi-directional operation, compact SMB footprint, AEC-Q101 qualification, and optimized 800 W rating - making it the preferred choice for space-constrained automotive and industrial signal-line protection where polarity independence is mandatory.
Availability
SMB8J12C-E3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, and consumer USB port protection requiring stable component supply and full traceability.
Supply support for SMB8J12C-E3/5B 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMB8J series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for AEC-Q101-compliant, high-power-density surge suppression in harsh-environment electronics with stringent space and thermal constraints.
FAQ
What is the polarity configuration of SMB8J12C-E3/5B?
SMB8J12C-E3/5B is a bi-directional TVS diode with symmetrical breakdown characteristics - neither terminal is designated anode or cathode. It clamps voltage transients of either polarity equally, and no color band or marking is present on the DO-214AA package to indicate polarity.
Does SMB8J12C-E3/5B meet automotive qualification standards?
Yes, SMB8J12C-E3/5B is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per the AEC-Q101-004 standard - confirming suitability for under-hood and body-control module applications.
What is the maximum clamping voltage of SMB8J12C-E3/5B at rated surge current?
The maximum clamping voltage (VC) of SMB8J12C-E3/5B is 19.9 V at 40.2 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is guaranteed per the Vishay datasheet and defines the upper voltage limit imposed on protected circuitry during surge events.
Can SMB8J12C-E3/5B be used in place of a uni-directional TVS like SMBJ12A?
No - SMB8J12C-E3/5B is bi-directional and lacks polarity marking, whereas SMBJ12A is uni-directional with a cathode band. Substituting them requires verifying circuit topology: SMB8J12C-E3/5B suits AC/differential lines; SMBJ12A is for DC-biased single-ended paths where polarity is fixed.
What PCB layout guidance applies to SMB8J12C-E3/5B for optimal thermal and electrical performance?
For rated 800 W surge handling, Vishay specifies mounting SMB8J12C-E3/5B on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Avoid narrow traces between the device and protected node; minimize loop area to reduce inductive voltage overshoot during fast transients.
SMB8J12C-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 22V
- Current - Peak Pulse (10/1000µs):
- 36.4A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J12C-E3/5B FAQ
1.How can I place an order for SMB8J12C-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J12C-E3/5B 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 SMB8J12C-E3/5B reliable?
The price and inventory of SMB8J12C-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J12C-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J12C-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J12C-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J12C-E3/5B?
SMB8J12C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J12C-E3/5B 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 SMB8J12C-E3/5B?
For technical support, including SMB8J12C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J12C-E3/5B requirements.
6.How does Aetrix verify that SMB8J12C-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J12C-E3/5B 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 SMB8J12C-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J12C-E3/5B?
All SMB8J12C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J12C-E3/5B, 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 SMB8J12C-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J12C-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J12C-E3/5B Tags
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