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Vishay General Semiconductor - Diodes Division SMC3K12CAHM3_A/H
- Part No.:
- SMC3K12CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K12CAHM3_A/H.pdf
- Description:
- 3KW, 12V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:709
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Product details
Overview
SMC3K12CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 3000 W peak pulse power (10/1000 μs), 13.3–14.7 V breakdown voltage, and 19.9 V clamping voltage at 1245 A peak pulse current. It protects MOSFETs, ICs, and sensor signal lines in automotive power systems against ISO 7637-2 and ISO 16750-2 transients.
For engineers reviewing the SMC3K12CAHM3_A datasheet, SMC3K12CAHM3_A pinout, SMC3K12CAHM3_A application, or SMC3K12CAHM3_A equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, UL 497B safety recognition, ESD immunity up to 30 kV (IEC 61000-4-2), and thermal resistance data (RthJA = 90 °C/W) critical for layout and reliability validation.
Technical Context
This TVS diode operates bidirectionally with no polarity marking and features low incremental surge resistance and sub-nanosecond response time to clamp fast-rising transients. Its 175 °C maximum junction temperature and MSL Level 1 rating support reflow soldering at 260 °C peak.
The device meets stringent automotive standards including ISO 7637-2 Pulse 1, 2a, 3a, 3b and ISO 16750-2 Pulse b, and delivers 30 kV contact-mode ESD protection per IEC 61000-4-2 - validated under 150 pF / 330 Ω human body model conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 13.3–14.7 V at 1 mA test current - defines minimum voltage at which clamping initiates reliably |
| Stand-off Voltage (VWM) | 12 V - maximum continuous reverse operating voltage before leakage exceeds 5 μA |
| Clamping Voltage (VC) | 19.9 V at 1245 A (10/1000 μs) - peak voltage seen by protected circuit during worst-case surge |
| Peak Pulse Power (PPPM) | 3000 W (10/1000 μs) - energy-handling capability for automotive load dump and inductive switching events |
| ESD Withstand (IEC 61000-4-2) | 30 kV contact & air discharge - ensures robustness against assembly and field electrostatic events |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in under-hood automotive environments and industrial enclosures |
| Thermal Resistance (RthJA) | 90 °C/W - enables thermal design margin estimation on standard FR4 PCB with 2 oz copper |
Pinout & Package
Package: SMC (DO-214AB), halogen-free, RoHS-compliant, AEC-Q101 qualified; matte tin-plated leads, J-STD-002 solderable; MSL Level 1, 260 °C peak reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | Transient current sink (bidirectional) | No polarity marking on bidirectional types; both terminals function identically as clamping paths to ground or rail |
| Anode (unmarked side) | Transient current sink (bidirectional) | Identical clamping behavior to cathode; symmetric structure enables placement without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 30 kW surge handling (8/20 μs) | Supports high-current lightning-induced surges per IEC 61000-4-5 compliance requirements |
| AEC-Q101 qualification | Validated for automotive electronics use including engine control units, ADAS sensors, and body controllers |
| UL 497B recognition (E136766) | Confirms safety compliance for telecom and industrial interface protection applications |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage stress on downstream components during transient events |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients per ISO 16750-2 Pulse b. IC Role / Device Role / Timing Role: Primary clamping element placed between power rail and ground, absorbing >100 J pulses without failure. Use Value: Limits rail voltage to ≤19.9 V during 1245 A surge, preventing MOSFET gate oxide rupture and microcontroller brownout. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) shunt protector on 0–5 V or 4–20 mA output lines exposed to relay coil switching noise. Use Value: Clamps induced spikes to <20 V within nanoseconds, preserving ADC reference integrity and avoiding false trigger in monitoring circuits. |
| Automotive CAN Bus Interface | Consumer Power Adapter Input Stage |
Use Scenario: Safeguarding CAN transceivers (e.g., TJA1042) against ISO 7637-2 Pulse 2a (inductive switch-off) on vehicle wiring harnesses. IC Role / Device Role / Timing Role: Bidirectional TVS placed across CAN_H/CAN_L differential pair, referenced to chassis ground. Use Value: Maintains differential voltage below 35 V during 112 V/50 μs transients, ensuring bit error rate remains within CAN FD specification limits. |
Use Scenario: Input-stage surge suppression in universal AC/DC adapters for smartphones and IoT hubs subjected to mains-borne surges. IC Role / Device Role / Timing Role: First-line defense after bridge rectifier, clamping line-to-line and line-to-ground transients before primary-side controller. Use Value: Withstands 3000 W (10/1000 μs) surges while maintaining VWM = 12 V compatibility with 15 V-rated input capacitors and MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA | Lower PPPM (600 W), SMB package (smaller footprint), higher VC (21.2 V @ 30.2 A) | Not rated for AEC-Q101; suitable only for non-automotive consumer/industrial use | Select when space-constrained layouts require smaller SMT footprint and surge energy is ≤600 W |
| 1.5KE12CA | Through-hole DO-201 package, same VBR/VC, PPPM = 1500 W, no AEC-Q101 or UL recognition | Limited to prototyping or legacy through-hole designs; lacks automotive qualification and reflow compatibility | Choose only for manual assembly or cost-sensitive non-automotive replacements where board real estate is not constrained |
Compared with SMBJ12CA and 1.5KE12CA, SMC3K12CAHM3_A delivers 5× higher surge power handling, AEC-Q101 qualification, and UL safety certification - making it the sole option for production automotive ECUs requiring validated reliability and regulatory compliance.
Availability
SMC3K12CAHM3_A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, CAN bus protection, and consumer adapter input stages requiring stable component supply across multi-year production cycles.
Supply support for SMC3K12CAHM3_A 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The SMC3KxxCAHM3_A series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for AEC-Q101-compliant automotive electronics needing robust, standardized surge immunity against ISO 7637-2 and ISO 16750-2 threats.
FAQ
What is the maximum clamping voltage of SMC3K12CAHM3_A under a 10/1000 μs surge?
The SMC3K12CAHM3_A clamps to a maximum of 19.9 V when subjected to its rated peak pulse current of 1245 A with a 10/1000 μs waveform. This value is measured at the device terminals under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during such transients. The SMC3K12CAHM3_A maintains this clamping performance across its full operating temperature range.
Is SMC3K12CAHM3_A qualified for automotive applications?
Yes, SMC3K12CAHM3_A is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO 7637-2 Pulse 1, 2a, 3a, 3b and ISO 16750-2 Pulse b requirements, and is rated for operation from −55 °C to +175 °C. Its halogen-free, RoHS-compliant construction and MSL Level 1 reflow profile further support automotive manufacturing processes. The SMC3K12CAHM3_A carries UL 497B recognition (file E136766) for safety-critical implementations.
What does the "HM3_A" suffix indicate in SMC3K12CAHM3_A?
The "HM3_A" suffix denotes Vishay's high-reliability, halogen-free, RoHS-compliant variant with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. The "HM3" portion confirms qualification to JESD 201 Class 2 whisker resistance, and the "_A" indicates tape-and-reel packaging per JEDEC standards. This suffix identifies the SMC3K12CAHM3_A as the preferred industrial and automotive-grade version versus legacy variants.
How does SMC3K12CAHM3_A compare to SMC3K10CAHM3_A in terms of voltage ratings?
The SMC3K12CAHM3_A has a higher breakdown voltage range (13.3–14.7 V) and stand-off voltage (12 V) than SMC3K10CAHM3_A (11.1–12.3 V VBR, 10 V VWM). Its clamping voltage is also elevated (19.9 V vs. 17.0 V), reflecting tighter voltage tolerance and optimized doping for 12 V system protection. Both share identical package, surge ratings, and qualifications - the SMC3K12CAHM3_A is selected specifically for nominal 12 V rails where margin above VWM must exceed 2 V.
Can SMC3K12CAHM3_A be used in bidirectional signal line protection?
Yes, SMC3K12CAHM3_A is inherently bidirectional and requires no polarity marking, making it ideal for protecting AC-coupled or floating differential pairs such as CAN_H/CAN_L, RS-485, or audio lines. Its symmetrical IV characteristic ensures identical clamping behavior regardless of transient polarity. The SMC3K12CAHM3_A achieves this without external circuitry, simplifying layout and reducing BOM count in noise-sensitive signal chains.
SMC3K12CAHM3_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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 151A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC3K12CAHM3_A/H FAQ
1.How can I place an order for SMC3K12CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K12CAHM3_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 SMC3K12CAHM3_A/H reliable?
The price and inventory of SMC3K12CAHM3_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 SMC3K12CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMC3K12CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K12CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K12CAHM3_A/H?
SMC3K12CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K12CAHM3_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 SMC3K12CAHM3_A/H?
For technical support, including SMC3K12CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K12CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K12CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K12CAHM3_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 SMC3K12CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMC3K12CAHM3_A/H?
All SMC3K12CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K12CAHM3_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 SMC3K12CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMC3K12CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K12CAHM3_A/H Tags
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