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Vishay General Semiconductor - Diodes Division SMCJ12HE3/9AT
- Part No.:
- SMCJ12HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12HE3/9AT.pdf
- Description:
- TVS DIODE 12VWM 22VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,769
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Product details
Overview
SMCJ12HE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 12 V standoff voltage (VWM), 13.3–14.7 V breakdown range at 1 mA, 19.9 V clamping voltage at 75.4 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial motor drives.
For engineers reviewing the SMCJ12HE3/9AT datasheet, SMCJ12HE3/9AT pinout, SMCJ12HE3/9AT application, or SMCJ12HE3/9AT equivalent, key selection criteria include its AEC-Q101 qualification, 150 °C maximum junction temperature, low incremental surge resistance, and RoHS-compliant matte tin-plated leads meeting J-STD-002 solderability standards.
Technical Context
The SMCJ12HE3/9AT operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown threshold. Its glass-passivated junction ensures stable leakage performance and fast response (<1 ns), while thermal resistance values (RθJA = 75 °C/W, RθJL = 15 °C/W) support reliable operation under repetitive surge conditions on standard 8.0 mm × 8.0 mm copper pads.
Designed for transient suppression per ANSI/IEEE C62.35, it delivers precise clamping behavior with 19.9 V max VC at IPPM = 75.4 A (10/1000 µs), and maintains ≤5.0 µA reverse leakage at 12 V standoff - enabling use in low-power sensor interfaces and high-reliability automotive subsystems without compromising signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before conduction begins; sets safe margin below system rail voltage. |
| VBR min/max | 13.3 V / 14.7 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on during transients. |
| VC @ IPPM | 19.9 V at 75.4 A - Clamping voltage limits downstream IC stress during 10/1000 µs surges. |
| PPPM | 1500 W - Peak pulse power handling capacity supports IEC 61000-4-5 Level 4 surge immunity compliance. |
| IFSM | 200 A - Surge current rating for 8.3 ms half-sine wave enables protection against inductive switch-off events. |
| TJ max | +150 °C - Junction temperature limit allows deployment in under-hood automotive environments. |
| Leakage ID | ≤5.0 µA at VWM - Low standby current preserves battery life in always-on circuits. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with cathode band marking on unidirectional variant. Matte tin-plated leads meet J-STD-002 solderability and JESD 22-B102 mechanical reliability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration. |
| Cathode | Reverse-biased clamping terminal | Marked end; connects to protected line (e.g., 12 V supply or CAN-H); conducts during overvoltage events. |
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 electrical parameters over time and humidity exposure, critical for long-life industrial deployments. |
| MSL Level 1 (260 °C) | Enables compatibility with standard lead-free reflow profiles without moisture sensitivity concerns. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision for MOSFET gate protection. |
| RoHS-compliant HE3 suffix | Indicates AEC-Q101 qualification and JESD 201 Class 2 whisker resistance for high-reliability solder joints. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V power distribution networks in engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and local regulator input. Use Value: Limits transient excursions to ≤19.9 V, preventing damage to downstream LDOs and microcontrollers rated for 16 V absolute max. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and inductive coupling in factory automation sensors. IC Role / Device Role / Timing Role: Standoff-connected TVS on signal line with grounded cathode, absorbing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Sub-20 V clamping preserves op-amp input stage integrity and avoids latch-up in precision signal conditioning circuits. |
| Telecom DC Power Input Protection | MOSFET Gate Driver Protection |
Use Scenario: Safeguarding -48 V telecom rectifier outputs from lightning-induced surges on outdoor cabinet feeds. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; this unidirectional part applied with polarity-aligned orientation on negative rail. Use Value: Withstands 1500 W pulses while maintaining <5 µA leakage, ensuring minimal standby power loss across thousands of deployed units. | Use Scenario: Preventing gate oxide rupture in high-side N-channel MOSFETs driven by PWM controllers in motor inverters. IC Role / Device Role / Timing Role: Cathode tied to gate, anode to source; clamps Miller-induced voltage spikes during switching transitions. Use Value: 19.9 V clamping headroom aligns with typical 20 V gate-source rating, eliminating need for external Zener clamps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12AHE3/A | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC specs. | Suitable for space-constrained consumer electronics; insufficient for automotive load dump per ISO 7637-2. | Select SMCJ12HE3/9AT when 1500 W surge capability and AEC-Q101 validation are required. |
| 1.5KE12A | Through-hole TO-218 package, identical electrical specs but no AEC-Q101 qualification or MSL-1 rating. | Applicable in legacy industrial power supplies where automated SMT assembly is not needed. | Choose SMCJ12HE3/9AT for new SMT designs requiring automotive qualification and RoHS-compliant lead finish. |
Compared with SMAJ12AHE3/A and 1.5KE12A, the SMCJ12HE3/9AT uniquely combines 1500 W surge rating, AEC-Q101 qualification, and DO-214AB packaging optimized for high-volume automotive PCB assembly - making it the preferred choice for next-generation ECU and ADAS power protection.
Availability
SMCJ12HE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial motor drives, and telecom power systems requiring stable component supply and full traceability.
Supply support for SMCJ12HE3/9AT 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series targets high-energy transient suppression in harsh environments; engineered for automotive, industrial, and telecom applications demanding AEC-Q101 validation and robust surge immunity.
FAQ
What is the clamping voltage of the SMCJ12HE3/9AT under maximum surge conditions?
The SMCJ12HE3/9AT has a maximum clamping voltage (VC) of 19.9 V at 75.4 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for ensuring downstream components like 16 V-rated regulators remain within safe operating area.
Is the SMCJ12HE3/9AT qualified for automotive applications?
Yes, the SMCJ12HE3/9AT carries the HE3 suffix indicating AEC-Q101 qualification. It has undergone stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD per the AEC-Q101 standard, confirming suitability for under-hood and chassis-mounted automotive modules such as body control units and powertrain sensors.
What does the "9AT" in SMCJ12HE3/9AT indicate?
The "9AT" denotes the preferred package code for 13-inch diameter plastic tape-and-reel delivery, containing 3500 units per reel. This format supports high-speed pick-and-place assembly and is compatible with standard SMT line feeders - distinct from the "57T" code used for 7-inch reels with 850 units.
How does the SMCJ12HE3/9AT differ from the bi-directional SMCJ12CA variant?
The SMCJ12HE3/9AT is unidirectional with cathode band marking and conducts only in reverse bias, whereas SMCJ12CA is bi-directional with no polarity marking and clamps in both directions. Their VWM, VBR, and VC values differ slightly due to internal structure - SMCJ12HE3/9AT has VWM = 12 V and VC = 19.9 V, while SMCJ12CA has VWM = 12 V but higher VC = 21.2 V at same IPPM.
What thermal derating applies to the SMCJ12HE3/9AT above 25 °C ambient?
The SMCJ12HE3/9AT must be derated linearly above 25 °C ambient per Figure 2 in Vishay document 88394: peak pulse power decreases by approximately 1.2% per °C rise, reaching ~75% of 1500 W at 100 °C ambient. This reflects its RθJA = 75 °C/W and requires thermal pad design per recommended 8.0 mm × 8.0 mm copper layout for full rating.
SMCJ12HE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 22V
- Current - Peak Pulse (10/1000µs):
- 68.2A
- 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)
SMCJ12HE3/9AT FAQ
1.How can I place an order for SMCJ12HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12HE3/9AT 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 SMCJ12HE3/9AT reliable?
The price and inventory of SMCJ12HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12HE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ12HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12HE3/9AT?
SMCJ12HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12HE3/9AT 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 SMCJ12HE3/9AT?
For technical support, including SMCJ12HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12HE3/9AT requirements.
6.How does Aetrix verify that SMCJ12HE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ12HE3/9AT 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 SMCJ12HE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ12HE3/9AT?
All SMCJ12HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12HE3/9AT, 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 SMCJ12HE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ12HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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