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Vishay General Semiconductor - Diodes Division SMCJ12AHE3_A/I
- Part No.:
- SMCJ12AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12AHE3_A/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,480
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Product details
Overview
SMCJ12AHE3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 12 V standoff voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 19.9 V clamping voltage (VC) at 75.4 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with a 10/1000 µs waveform - deployed in automotive ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ12AHE3_A/I datasheet, SMCJ12AHE3_A/I pinout, SMCJ12AHE3_A/I application, or SMCJ12AHE3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, SMC (DO-214AB) package, low 0.083 %/°C VBR temperature coefficient, and verified 1500 W surge capability under standardized transients - critical for high-reliability 12 V system protection.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR to limit transient energy. Its glass-passivated junction ensures stable breakdown behavior and fast response (<1 ns), while the unidirectional polarity enables integration on positive-rail DC paths without forward-conduction interference.
Thermal design relies on its RθJA of 75 °C/W and RθJL of 15 °C/W, requiring minimum 8.0 mm × 8.0 mm copper pads per terminal for full 1500 W rating. The device is rated for TJ = –55 °C to +150 °C and meets J-STD-020 MSL Level 1 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal DC rail operation. |
| VBR min/max | 13.3 V / 14.7 V at IT = 1 mA - defines precise avalanche onset window; ensures consistent triggering across production lots. |
| VC @ IPPM | 19.9 V at 75.4 A - clamped voltage during 10/1000 µs surge; determines worst-case stress on downstream ICs. |
| PPPM | 1500 W - peak transient power it can absorb without failure; validates suitability for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4. |
| ID @ VWM | 5.0 µA - reverse leakage at 12 V; low enough to avoid measurable power loss or bias shift in high-impedance circuits. |
| TJ max | +150 °C - maximum junction temperature; supports under-hood automotive use with appropriate PCB thermal relief. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked by cathode band; anode and cathode terminals are non-reversible for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when V > VBR - must route with low-inductance path to GND plane. |
| Anode | Reference node | Typically tied to system ground or low-impedance return; forms complete clamping loop - requires direct connection to ground plane for effective energy dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors - supports PPAP and long-term reliability requirements. |
| 1500 W peak pulse power | Withstands severe transients like load dump (ISO 16750-2) and inductive switching spikes without degradation - eliminates need for cascaded protection stages. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage overshoot during clamping - protects 12 V-rated ICs such as CAN transceivers and microcontrollers without derating margins. |
| MSL Level 1, 260 °C peak | Compatible with standard lead-free reflow profiles - no moisture sensitivity handling required prior to assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs of engine control units (ECUs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Parallel-connected clamping TVS that diverts surge current away from LDO regulators and MCU power pins during transients. Use Value: Maintains <19.9 V rail voltage during 1500 W surges, preventing brownout resets and latch-up in AEC-Q100 Grade 2 components. | Use Scenario: Shielding analog input channels of PLC analog I/O modules from ESD and field-wiring induced transients. IC Role / Device Role / Timing Role: Front-end transient suppressor placed before precision op-amps and ADC drivers on 4–20 mA or 0–10 V sensor interfaces. Use Value: Limits transient voltage to ≤19.9 V within nanoseconds, preserving signal integrity and avoiding saturation or damage to 16-bit SAR ADC front-ends. |
| Telecom DC Power Input Protection | Consumer Device USB Power Line Protection |
Use Scenario: Safeguarding 12 V DC inputs of PoE-powered network switches and base station RF modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on bulk DC input, coordinated with upstream fuses and secondary filtering. Use Value: Absorbs up to 1500 W of lightning-induced surges (IEC 61000-4-5) without failure, enabling single-stage protection architecture. | Use Scenario: Adding surge immunity to 12 V auxiliary power inputs on smart home hubs and set-top boxes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between DC jack and internal DC-DC converter input. Use Value: Clamps fast EFT bursts (IEC 61000-4-4) to ≤19.9 V, preventing latch-up in buck controller ICs rated for 20 V max input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC12 | Lower PPPM (600 W), same VWM (12 V), DO-214AC (SMA) package - smaller footprint but reduced surge capacity. | Best suited for space-constrained consumer devices with lower-energy transients (e.g., IEC 61000-4-2 ESD only). | Select SAC12 only if board area is critical and surge threat level is limited to ±8 kV contact ESD - not for automotive or industrial surge standards. |
| 1.5KE12A | Same VWM (12 V), higher VC (20.1 V), axial DO-15 package - legacy through-hole form factor with identical electrical specs but no AEC-Q101 qualification. | Applicable where through-hole mounting is mandated or reflow compatibility is not required; lacks automotive qualification evidence. | Choose 1.5KE12A for cost-sensitive industrial controls where AEC-Q101 is unnecessary and manual assembly is acceptable. |
Compared with SAC12 and 1.5KE12A, the SMCJ12AHE3_A/I delivers superior surge robustness (1500 W vs. 600 W or 1500 W with no automotive validation), compact SMC packaging, and documented AEC-Q101 compliance - making it the preferred choice for automotive-grade and high-reliability 12 V DC protection.
Availability
SMCJ12AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ12AHE3_A/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and communications infrastructure - prioritizing low clamping voltage, tight VBR tolerance, and AEC-Q101 qualification.
FAQ
What is the clamping voltage of the SMCJ12AHE3_A/I under a 10/1000 µs surge?
The SMCJ12AHE3_A/I clamps to a maximum of 19.9 V when subjected to its rated peak pulse current of 75.4 A using a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for 12 V systems. The SMCJ12AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is the SMCJ12AHE3_A/I qualified for automotive applications?
Yes, the SMCJ12AHE3_A/I carries AEC-Q101 qualification, verified per the "HE3" suffix designation in Vishay's ordering nomenclature. It is rated for operation from –55 °C to +150 °C and meets J-STD-020 MSL Level 1, supporting under-hood and chassis-mounted automotive use. The SMCJ12AHE3_A/I is explicitly listed in Vishay's qualified automotive product list for ECUs, body control modules, and ADAS subsystems.
What is the standoff voltage (VWM) and why does it matter for SMCJ12AHE3_A/I placement?
The SMCJ12AHE3_A/I has a standoff voltage (VWM) of 12 V, meaning it remains non-conductive below this reverse voltage - essential for reliable operation on nominal 12 V rails. This allows the SMCJ12AHE3_A/I to be placed directly across the power input without leakage or power loss, while still responding instantly to transients exceeding ~13.3 V. Proper placement requires short, low-inductance traces to ground to preserve clamping speed.
How does the SMCJ12AHE3_A/I compare to bidirectional TVS diodes like SMCJ12CA?
The SMCJ12AHE3_A/I is unidirectional and intended for DC line protection where polarity is fixed, offering lower leakage and tighter VBR tolerance than its bidirectional counterpart SMCJ12CA. Unlike SMCJ12CA, the SMCJ12AHE3_A/I cannot protect AC or floating signals - but provides superior performance in 12 V automotive and industrial DC applications due to its AEC-Q101 qualification and optimized clamping behavior. Both share the same SMC package and 1500 W rating.
What PCB layout guidelines apply to maximize SMCJ12AHE3_A/I surge performance?
To achieve full 1500 W rating, the SMCJ12AHE3_A/I must be mounted on minimum 8.0 mm × 8.0 mm copper pads per terminal, per Vishay's thermal test condition. Keep cathode-to-ground and anode-to-ground traces as short and wide as possible to minimize inductance; avoid vias in the main surge path. Use solid inner-layer ground planes beneath the device, and ensure thermal relief connects adequately to internal ground planes. The SMCJ12AHE3_A/I's RθJL of 15 °C/W depends on this layout fidelity.
SMCJ12AHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 75.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SMCJ12AHE3_A/I FAQ
1.How can I place an order for SMCJ12AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12AHE3_A/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 SMCJ12AHE3_A/I reliable?
The price and inventory of SMCJ12AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ12AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12AHE3_A/I?
SMCJ12AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12AHE3_A/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 SMCJ12AHE3_A/I?
For technical support, including SMCJ12AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12AHE3_A/I requirements.
6.How does Aetrix verify that SMCJ12AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ12AHE3_A/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 SMCJ12AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ12AHE3_A/I?
All SMCJ12AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12AHE3_A/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 SMCJ12AHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ12AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12AHE3_A/I Tags
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