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Vishay General Semiconductor - Diodes Division SMCJ12AHM3_A/H
- Part No.:
- SMCJ12AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12AHM3_A/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,302
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Product details
Overview
SMCJ12AHM3_A/H 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 voltage (VBR at 1 mA), 19.9 V maximum clamping voltage (VC) at 75.4 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive ECUs, industrial I/O modules, and sensor interface circuits.
For engineers reviewing the SMCJ12AHM3_A/H datasheet, SMCJ12AHM3_A/H pinout, SMCJ12AHM3_A/H application, or SMCJ12AHM3_A/H equivalent, key selection criteria include verified clamping performance under 10/1000 µs surge, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ12AHM3_A/H operates as a silicon avalanche diode that enters controlled breakdown when reverse voltage exceeds VBR, diverting transient energy to ground while clamping the protected line to ≤19.9 V. Its glass-passivated junction ensures stable leakage (<5 µA at 12 V) and fast response time (<1 ns), critical for safeguarding MOSFET gates and microcontroller I/O pins against ESD and inductive switching spikes.
Thermally, it sustains 150 °C maximum junction temperature with derated pulse capability above 25 °C ambient, per Fig. 2 in the datasheet. The SMC package provides low incremental surge resistance and meets MSL Level 1 (260 °C reflow peak), enabling reliable high-volume manufacturing without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 12 V systems. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during transients. |
| VC @ IPPM | 19.9 V at 75.4 A - Clamped voltage under 1500 W 10/1000 µs surge; determines maximum stress on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling capacity; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity designs. |
| ID @ VWM | ≤5 µA - Reverse leakage at 12 V; negligible loading on low-power sensor bias networks. |
| TJ max | 150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8.0 mm × 8.0 mm pads; informs board-level thermal design. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. 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 during overvoltage events. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors. |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 4 kV surge tests without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio TVS devices. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without preconditioning or baking. |
| Halogen-free & RoHS-compliant (HM3) | Fulfills strict environmental requirements for global automotive and industrial OEMs. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-supplied microcontrollers and CAN transceivers from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping surges before they reach LDO inputs or MCU VCC. Use Value: Limits transient voltage to ≤19.9 V during 1500 W pulses, preventing latch-up or gate oxide damage in downstream semiconductors. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: TVS connected across sensor output and ground, absorbing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Sub-1 ns response ensures clamping occurs before sensitive op-amp input stages are overstressed. |
| DC Motor Drive Gate Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Safeguarding N-channel MOSFET gate drivers in brushed DC motor controllers from inductive kickback. IC Role / Device Role / Timing Role: TVS placed between gate and source, limiting VGS to safe levels during flyback events. Use Value: 19.9 V clamping voltage stays well below typical MOSFET VGS(max) ratings (e.g., 20 V), avoiding gate rupture. |
Use Scenario: Front-end protection of Ethernet PHYs and PoE injectors against lightning-induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Unidirectional TVS used in conjunction with common-mode chokes to suppress differential-mode transients. Use Value: 1500 W rating supports GR-1089-CORE Level 3 (10/1000 µs, 1 kA) telecom surge standards. |
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 | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VBR range. | Suitable for space-constrained consumer electronics but not automotive-grade surge immunity. | Select when board area is limited and 400 W surge capability suffices. |
| SMCJ12AHE3_A/H | Same electrical specs and SMC package, but uses standard RoHS-compliant (E3) plating instead of halogen-free (HM3). | Acceptable for commercial/industrial use where halogen-free mandate does not apply. | Choose for cost-sensitive non-automotive designs requiring identical performance and footprint. |
Compared with SMCJ12AHE3_A/H, the SMCJ12AHM3_A/H adds halogen-free compliance without sacrificing surge rating or thermal performance; versus SMAJ12AHE3/A, it delivers 3.75× higher pulse power in a larger but thermally superior package - making SMCJ12AHM3_A/H the only option meeting AEC-Q101 + 1500 W + halogen-free requirements.
Availability
SMCJ12AHM3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and DC motor drive gate safeguarding requiring stable component supply across long production lifecycles.
Supply support for SMCJ12AHM3_A/H 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, automotive qualification, and high-power handling.
The SMCJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications demanding AEC-Q101 validation and 1500 W surge resilience.
FAQ
What is the clamping voltage of the SMCJ12AHM3_A/H under maximum rated surge current?
The SMCJ12AHM3_A/H clamps to a maximum of 19.9 V when subjected to its rated 75.4 A peak pulse current (10/1000 µs waveform). This value is measured per standardized test conditions in the Vishay datasheet (Document Number: 88394) and reflects worst-case VC across process variation and temperature extremes. Designers must verify that this clamping level remains within the absolute maximum ratings of the protected ICs in their specific SMCJ12AHM3_A/H implementation.
Is the SMCJ12AHM3_A/H qualified to AEC-Q101, and what does that entail for automotive use?
Yes, the SMCJ12AHM3_A/H carries AEC-Q101 qualification, confirmed by Vishay's ordering code suffix "HM3" and documentation in the SMCJ5.0A–SMCJ188CA datasheet (Rev. 09-Jan-2024). This means the device has passed stress tests including HTGB, HTRB, TCT, and ESD per AEC-Q101 Rev. E, validating its suitability for automotive powertrain, chassis, and body electronics. The SMCJ12AHM3_A/H is approved for under-hood and cabin applications where reliability under thermal cycling and vibration is mandatory.
How does the HM3 suffix differ from the HE3 suffix in the SMCJ12A family?
The HM3 suffix on SMCJ12AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification, whereas HE3 indicates RoHS-compliant and AEC-Q101 qualified but not halogen-free. Both share identical electrical parameters, SMC package, and thermal characteristics. The HM3 variant satisfies stricter environmental mandates (e.g., JIG-101, China RoHS II) required by Tier 1 automotive suppliers and green industrial OEMs - making SMCJ12AHM3_A/H the appropriate choice when halogen content must be zero.
What is the recommended PCB pad layout for optimal thermal and surge performance of the SMCJ12AHM3_A/H?
Vishay specifies mounting the SMCJ12AHM3_A/H on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated 1500 W pulse power and 75 °C/W thermal resistance. Smaller pads reduce surge capability and increase junction temperature during repeated transients. Thermal vias under pads are recommended for high-reliability automotive layouts. The SMCJ12AHM3_A/H datasheet Figure 2 provides derating curves confirming performance loss above 25 °C ambient if pad area is undersized.
Can the SMCJ12AHM3_A/H be used in bidirectional configurations?
No - the SMCJ12AHM3_A/H is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and cathode band marking. Bidirectional operation requires the CA variant (e.g., SMCJ12CAHM3_A/H), which lacks polarity marking and exhibits symmetric breakdown in both directions. Using SMCJ12AHM3_A/H in reverse-biased AC applications would result in forward conduction and failure. Always match the device type (A vs. CA) to the circuit's voltage polarity requirements.
SMCJ12AHM3_A/H 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/H FAQ
1.How can I place an order for SMCJ12AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12AHM3_A/H 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/H reliable?
The price and inventory of SMCJ12AHM3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMCJ12AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12AHM3_A/H?
SMCJ12AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12AHM3_A/H 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/H?
For technical support, including SMCJ12AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12AHM3_A/H requirements.
6.How does Aetrix verify that SMCJ12AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ12AHM3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMCJ12AHM3_A/H?
All SMCJ12AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12AHM3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMCJ12AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12AHM3_A/H Tags
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