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Vishay General Semiconductor - Diodes Division SMCJ12AHM3_A/I
- Part No.:
- SMCJ12AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12AHM3_A/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,447
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Product details
Overview
SMCJ12AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. 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 (10/1000 µs), and 1500 W peak pulse power rating - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ12AHM3_A/I datasheet, SMCJ12AHM3_A/I pinout, SMCJ12AHM3_A/I application, or SMCJ12AHM3_A/I equivalent, key selection criteria include clamping performance under 10/1000 µs surge, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ12AHM3_A/I operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR threshold to shunt transient energy to ground. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<5 µA at 12 V), while the SMC package supports high surge current handling without thermal runaway under repetitive transients.
Designed for primary-side protection in 12 V automotive systems, it meets JESD22-B102 solderability standards and MSL Level 1 per J-STD-020 (260 °C peak reflow). The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - critical for under-hood and ADAS power rail applications requiring long-term reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT = 1 mA | 13.3–14.7 V - guaranteed avalanche breakdown range, defining precise turn-on threshold |
| VC @ IPPM = 75.4 A | 19.9 V - clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPPM | 1500 W - peak pulse power dissipation capability, enabling protection against ISO 7637-2 Pulse 1/2a/5a |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard PCB pad layout, guiding heatsinking needs |
| TJ max | +150 °C - maximum junction temperature, supporting operation in under-hood environments |
| Leakage ID @ VWM | ≤5 µA - minimal standby power loss and signal integrity impact in always-on circuits |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VREV > VBR |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential rail; completes conduction path during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance requirements for modern automotive and industrial manufacturing |
| Low incremental surge resistance | Enables tighter clamping (19.9 V at 75.4 A) versus competing 12 V TVS devices |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, simplifying SMT production |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term parameter stability across temperature and lifetime |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and LDOs. Use Value: Limits transient voltage to ≤19.9 V, preventing damage to 24 V-tolerant input stages and ensuring system reset immunity. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional-capable protection (via adjacent bidirectional variant) or unidirectional rail clamp on sensor supply line. Use Value: Sub-20 V clamping preserves ADC reference integrity and avoids latch-up in op-amp front-ends during ESD or cable discharge events. |
| Telecom DC Power Feeds | Consumer Device USB Power Inputs |
Use Scenario: Shielding PoE-powered network switches and base stations from induced surges on 48 V DC distribution lines. IC Role / Device Role / Timing Role: Secondary-stage TVS on DC input after primary MOV or gas discharge tube. Use Value: Fast response (<1 ns) and low clamping enable coordination with upstream protectors to meet ITU-T K.20/21 immunity levels. | Use Scenario: Hardening USB-C PD input circuits in portable speakers and smart displays against hot-plug and adapter transients. IC Role / Device Role / Timing Role: Unidirectional clamp between VBUS and GND, rated for 12 V nominal bus with 20 V max tolerance. Use Value: 1500 W surge rating withstands repeated 10/1000 µs pulses without degradation, extending product field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12AHE3_A/I | Lower PPPM (400 W), smaller SMA package, same VWM/VC specs | Suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD), not ISO 7637-2 load dump | Select when board space is constrained and surge threat level is limited to human-body-model ESD. |
| SMCJ12AHE3_A/I | Same electrical specs and SMC package, but commercial-grade (non-AEC-Q101), RoHS-compliant E3 suffix | Lacks automotive qualification; not approved for under-hood or safety-critical vehicle subsystems | Choose for cost-sensitive industrial or consumer designs where AEC-Q101 is not mandated. |
Compared with SMCJ12AHM3_A/I, SMAJ12AHE3_A/I trades surge capacity for footprint reduction, while SMCJ12AHE3_A/I retains identical protection performance but omits automotive qualification - making the HM3 variant the sole choice for AEC-Q101-compliant 12 V rail protection.
Availability
SMCJ12AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom DC power feeds requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCJ12AHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability 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 where robustness and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of the SMCJ12AHM3_A/I under a 10/1000 µs surge?
The SMCJ12AHM3_A/I clamps to a maximum of 19.9 V when subjected to its rated peak pulse current of 75.4 A with a 10/1000 µs waveform. This value is measured per standard test conditions defined in ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024. The clamping performance ensures downstream 24 V-tolerant ICs remain within safe operating limits during automotive load dump events. SMCJ12AHM3_A/I maintains this specification across its full operating temperature range.
Is the SMCJ12AHM3_A/I qualified for automotive use?
Yes, the SMCJ12AHM3_A/I is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet under "Mechanical Data" and "Ordering Information." The HM3 suffix denotes halogen-free, RoHS-compliant construction combined with full automotive qualification - including stress testing for temperature cycling, mechanical shock, and humidity bias. This makes SMCJ12AHM3_A/I suitable for under-hood and ADAS applications where reliability under harsh environmental conditions is required.
What does the 'HM3' suffix mean in SMCJ12AHM3_A/I?
The 'HM3' suffix in SMCJ12AHM3_A/I indicates halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. Per Vishay's ordering nomenclature, HM3 distinguishes this variant from commercial-grade E3/M3 versions and non-automotive HE3 variants. The 'A/I' further specifies packaging: 13-inch tape-and-reel (I) with 3500 units per reel. This full designation ensures material compliance, qualification status, and logistics compatibility are unambiguously encoded in SMCJ12AHM3_A/I.
How does the SMCJ12AHM3_A/I compare to the SMAJ12AHE3_A/I in terms of surge handling?
The SMCJ12AHM3_A/I delivers 1500 W peak pulse power (PPPM), whereas the SMAJ12AHE3_A/I is rated for only 400 W - a 275 % higher surge capacity. This difference stems from the larger SMC (DO-214AB) package of SMCJ12AHM3_A/I versus the smaller SMA (DO-214AC) of SMAJ12AHE3_A/I. Consequently, SMCJ12AHM3_A/I sustains higher IPPM (75.4 A vs. 32.9 A) and is suitable for ISO 7637-2 load dump protection, while SMAJ12AHE3_A/I targets lower-energy threats like IEC 61000-4-2 ESD. Both share identical VWM and VC, but SMCJ12AHM3_A/I offers superior ruggedness.
What is the thermal resistance of the SMCJ12AHM3_A/I, and how does it affect PCB layout?
The SMCJ12AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended pad layout: 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes no additional copper pour or thermal vias. To maintain TJ ≤ 150 °C during repetitive surges, designers must ensure adequate copper area and consider thermal relief design. The datasheet specifies derating above TA = 25 °C per Figure 2 - a critical factor when placing SMCJ12AHM3_A/I near heat sources in dense automotive PCBs.
SMCJ12AHM3_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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ12AHM3_A/I FAQ
1.How can I place an order for SMCJ12AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12AHM3_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 SMCJ12AHM3_A/I reliable?
The price and inventory of SMCJ12AHM3_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 SMCJ12AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ12AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12AHM3_A/I?
SMCJ12AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12AHM3_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 SMCJ12AHM3_A/I?
For technical support, including SMCJ12AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12AHM3_A/I requirements.
6.How does Aetrix verify that SMCJ12AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ12AHM3_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 SMCJ12AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ12AHM3_A/I?
All SMCJ12AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12AHM3_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 SMCJ12AHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ12AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12AHM3_A/I Tags
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