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Vishay General Semiconductor - Diodes Division SMCJ12CAHM3_A/I
- Part No.:
- SMCJ12CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12CAHM3_A/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,219
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Product details
Overview
SMCJ12CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 12 V standoff voltage (VWM), 19.9 V maximum clamping voltage (VC) at 75.4 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMCJ12CAHM3_A/I datasheet, SMCJ12CAHM3_A/I pinout, SMCJ12CAHM3_A/I application, or SMCJ12CAHM3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with symmetrical bidirectional behavior validated across both polarities. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, while the SMC package supports high thermal dissipation under repetitive surge conditions.
Designed for transient suppression per IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive load dump), it delivers sub-nanosecond response time and meets MSL level 1 per J-STD-020 at 260 °C peak reflow temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 13.3 V / 14.7 V - Breakdown voltage range at 1.0 mA test current, defining turn-on threshold |
| VC @ IPPM | 19.9 V - Clamped voltage during 75.4 A 10/1000 μs surge, limiting stress on downstream ICs |
| PPPM | 1500 W - Peak pulse power handling capability under standardized surge waveform |
| ID @ VWM | 5.0 μA - Reverse leakage current at standoff voltage, critical for low-power sensor line integrity |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient, guiding PCB copper pad sizing for thermal management |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. No polarity marking for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Transient conduction path (bidirectional) | Both terminals function identically - conducts surge current in either direction when V > VBR |
| Anode (Cathode) | Transient conduction path (bidirectional) | Identical terminal role; no functional distinction between pins due to symmetric construction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern automotive and industrial manufacturing |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 6.6 V) and lower let-through energy during transients |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without dry-pack or baking preconditioning |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage drift over temperature and lifetime |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs against load dump and jump-start surges in body control modules. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at power entry point to shunt transient energy before LDO or DC-DC regulator. Use Value: Limits peak rail voltage to ≤19.9 V during 75.4 A surge, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) from ESD and inductive switching noise in factory automation sensors. IC Role / Device Role / Timing Role: Bidirectional clamp across differential signal pair to absorb ±15 kV contact ESD per IEC 61000-4-2 without signal distortion. Use Value: Maintains signal fidelity with <5.0 μA leakage at 12 V, avoiding offset errors in precision current-loop receivers. |
| Telecom Interface Surge Suppression | Consumer Device USB Port Protection |
Use Scenario: Shielding RS-485 transceiver I/O pins from lightning-induced surges in outdoor telecom base station backhaul links. IC Role / Device Role / Timing Role: Primary-level TVS mounted at connector interface to divert >1 kV surge energy before reaching PHY layer. Use Value: Withstands 1500 W peak pulse power and clamps within 1 ns, preserving data integrity during multi-kV transients. | Use Scenario: Adding secondary-level overvoltage protection to USB 2.0 D+/D− lines in portable medical monitors exposed to hospital-grade ESD events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp minimizing signal rise-time degradation on high-speed data lines. Use Value: Enables full USB 2.0 compliance (480 Mbps) while providing ±15 kV air/±8 kV contact ESD immunity per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12CAHE3_A/H | Lower PPPM (400 W), smaller SMA package, same VWM/VC specs | Not rated for AEC-Q101; limited to commercial-grade consumer/industrial use | Select when board space is constrained and surge energy is ≤400 W |
| SMCJ12CAHE3_A/I | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant (non-halogen-free) version | Acceptable where halogen-free mandate does not apply (e.g., non-automotive industrial) | Select when halogen-free requirement is waived and cost optimization is prioritized |
Compared with SMCJ12CAHM3_A/I, SMAJ12CAHE3_A/H offers reduced surge capacity in a smaller footprint, while SMCJ12CAHE3_A/I provides identical performance without halogen-free compliance - enabling trade-offs between environmental mandates, mechanical robustness, and layout constraints.
Availability
SMCJ12CAHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom infrastructure equipment requiring stable component supply with AEC-Q101 assurance and halogen-free compliance.
Supply support for SMCJ12CAHM3_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 and application-specific performance.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ISO 7637-2, IEC 61000-4-4, and ESD threats is mandatory.
FAQ
What is the clamping voltage of SMCJ12CAHM3_A/I at its rated peak pulse current?
The SMCJ12CAHM3_A/I has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current (IPPM) of 75.4 A under 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 surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMCJ12CAHM3_A/I achieves this with low incremental surge resistance and symmetrical bidirectional conduction.
Is SMCJ12CAHM3_A/I qualified for automotive applications?
Yes, SMCJ12CAHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88394. This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD, making the SMCJ12CAHM3_A/I suitable for under-hood and chassis-mounted automotive modules. Its +150 °C maximum junction temperature and MSL Level 1 rating further support reflow compatibility and long-term reliability in automotive production.
What does the 'CA' suffix indicate in SMCJ12CAHM3_A/I?
The 'CA' suffix in SMCJ12CAHM3_A/I denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both forward and reverse directions, with identical VBR, VC, and IPPM characteristics across polarity. Unlike unidirectional variants (e.g., SMCJ12A), the SMCJ12CAHM3_A/I has no cathode band marking and is used where AC-coupled or differential signal lines require equal protection regardless of voltage polarity - such as RS-485 buses or transformer-isolated power inputs.
How does the halogen-free designation affect SMCJ12CAHM3_A/I's performance or assembly?
The halogen-free designation in SMCJ12CAHM3_A/I refers solely to the molding compound composition - compliant with IEC 61249-2-21 - and does not alter electrical parameters, thermal performance, or solderability. It maintains full compatibility with standard lead-free reflow profiles (peak 260 °C, MSL Level 1), matte tin plating per J-STD-002, and JESD 22-B102 solderability. The SMCJ12CAHM3_A/I delivers identical VWM, VC, and PPPM as non-halogen-free variants while meeting stricter environmental regulations in automotive and EU industrial markets.
What PCB layout guidance applies to SMCJ12CAHM3_A/I for optimal thermal and surge performance?
For optimal performance, SMCJ12CAHM3_A/I should be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in Vishay's datasheet 88394. These pads reduce thermal resistance (RθJA = 75 °C/W) and improve surge current handling by lowering inductance and enhancing heat spreading. Avoid narrow traces between the SMCJ12CAHM3_A/I and protected node; place it as close as possible to the connector or IC input to minimize parasitic inductance that could elevate clamping voltage during fast transients.
SMCJ12CAHM3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ12CAHM3_A/I FAQ
1.How can I place an order for SMCJ12CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12CAHM3_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 SMCJ12CAHM3_A/I reliable?
The price and inventory of SMCJ12CAHM3_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 SMCJ12CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ12CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12CAHM3_A/I?
SMCJ12CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12CAHM3_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 SMCJ12CAHM3_A/I?
For technical support, including SMCJ12CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ12CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ12CAHM3_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 SMCJ12CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ12CAHM3_A/I?
All SMCJ12CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12CAHM3_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 SMCJ12CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ12CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12CAHM3_A/I Tags
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