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Vishay General Semiconductor - Diodes Division SMC3K120CAHM3_A/H
- Part No.:
- SMC3K120CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K120CAHM3_A/H.pdf
- Description:
- 3KW, 120V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:1,013
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Product details
Overview
SMC3K120CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for high-energy surge protection in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 193 V (max) under 15.5 A IPPM, and features a 120 V stand-off voltage with 1.0 μA leakage. It is AEC-Q101 qualified and used to protect 12 V/24 V battery systems against ISO 7637-2 Pulse 1, 2a, 3a/3b and ISO 16750-2 Pulse b transients.
For engineers reviewing the SMC3K120CAHM3_A datasheet, SMC3K120CAHM3_A pinout, SMC3K120CAHM3_A application, or SMC3K120CAHM3_A equivalent, this device is selected for robust ESD immunity (30 kV HBM), low clamping ratio (VC/VWM ≈ 1.61), MSL Level 1 reflow compatibility, and validated load-dump performance in automotive ECUs, sensor interfaces, and DC-DC converter inputs.
Technical Context
This TVS operates as a voltage-clamped shunt protector triggered by reverse-biased avalanche breakdown above its 133–147 V breakdown range. Its bidirectional symmetry enables protection of AC-coupled or floating signal lines without polarity concerns, and its low incremental surge resistance ensures minimal voltage overshoot during fast transients like ISO 7637-2 Pulse 3b (150 ns rise).
The device uses a planar junction structure in an SMC (DO-214AB) package with matte tin-plated leads, achieving thermal resistance RthJM = 4.0 °C/W and RthJA = 90 °C/W on FR4. It meets UL 497B recognition (E136766), JESD201 Class 2 whisker resistance, and halogen-free RoHS compliance - all verified per AEC-Q101 stress testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 120 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| Breakdown Voltage (VBR) | 133–147 V at 1 mA - Confirmed avalanche initiation range; ensures reliable triggering above system nominal voltage. |
| Max Clamping Voltage (VC) | 193 V at 15.5 A (10/1000 μs) - Actual worst-case voltage seen by protected circuit during 3000 W surge event. |
| Peak Pulse Power (PPPM) | 3000 W (10/1000 μs) - Sustained energy-handling capability for automotive load dump and switching transients. |
| ESD Rating | ±30 kV (IEC 61000-4-2 contact/air) - Full-system ESD hardening without external shielding or RC filtering. |
| Operating Temperature | −55 °C to +175 °C - Validated operation across engine bay, under-hood, and industrial ambient extremes. |
| Package | SMC (DO-214AB) - Industry-standard 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height. |
Pinout & Package
SMC3K120CAHM3_A uses a 2-terminal SMC (DO-214AB) package with no polarity marking due to bidirectional construction. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and compatible with standard reflow profiles up to 260 °C peak (MSL Level 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Common bidirectional terminal pair | Either lead serves as input or return path; symmetric conduction eliminates orientation dependency during PCB placement. |
| Cathode/Anode (unmarked) | Common bidirectional terminal pair | Enables clamping of both positive and negative transients without external diode pairing or layout constraints. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive electronics including temperature cycling, HTRB, and mechanical shock per Rev G requirements. |
| UL 497B recognition (E136766) | Meets safety standards for transient suppressors in telecom and industrial equipment requiring certified overvoltage protection. |
| Low clamping ratio (VC/VWM ≈ 1.61) | Minimizes voltage overshoot relative to working voltage - critical for protecting 120 V-rated downstream ICs and MOSFETs. |
| Junction capacitance < 100 pF at 0 V | Preserves signal integrity on data lines (e.g., CAN, LIN) without bandwidth degradation or timing skew. |
| Halogen-free & RoHS-compliant | Complies with environmental regulations for global OEM supply chains and end-of-life recycling requirements. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects microcontroller I/O and power supply inputs from load dump spikes (ISO 16750-2 Pulse b) and inductive kickback during relay coil de-energization. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at power entry point before LDO or DC-DC regulator. Use Value: Limits voltage to ≤193 V during 100 ms, 101 V load dump events, preventing latch-up or gate oxide rupture in 150 V-rated power FETs. |
Use Scenario: Shields 24 V digital input channels from field-wiring induced surges (e.g., motor cable coupling, lightning-induced ground potential rise). IC Role / Device Role / Timing Role: Primary front-end clamp on optocoupler input side, operating in parallel with series current-limiting resistor. Use Value: Withstands ≥5000 ISO 7637-2 Pulse 3b cycles (150 ns, ±150 V) while maintaining <1.0 μA leakage at 24 V nominal. |
| Automotive Sensor Hub (e.g., Radar/LiDAR) | Telecom Power Supply Interface |
Use Scenario: Safeguards low-noise analog front-ends and clock distribution networks from ESD and board-level EMI coupling in ADAS subsystems. IC Role / Device Role / Timing Role: Localized TVS at sensor module power inlet and high-speed interface connectors (e.g., FAKRA, HSD). Use Value: Delivers ±30 kV HBM ESD suppression without adding parasitic capacitance that would degrade 1–10 GHz RF signal fidelity. |
Use Scenario: Guards primary-side DC input of telecom rectifier modules against AC line surges and lightning-induced transients per IEC 61000-4-5. IC Role / Device Role / Timing Role: First-stage crowbar element upstream of bulk capacitor and active PFC stage. Use Value: Handles 30 kW (8/20 μs) surge events with <250 V clamping - enabling use of lower-voltage-rated electrolytic capacitors and reducing BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-E3/5A (Vishay) | Lower PPPM (400 W), SMA package (smaller footprint), unidirectional only | Limited to single-polarity rail protection; insufficient for ISO 16750-2 Pulse b load dump | Select only for space-constrained, low-energy signal-line protection where bidirectionality is not required. |
| 1.5KE120CA (ON Semiconductor) | Through-hole DO-201 package, same VWM/VC specs, but no AEC-Q101 or MSL Level 1 rating | Not suitable for automated SMT production or under-hood automotive environments | Use only in legacy through-hole designs or non-automotive industrial applications with manual assembly. |
Compared with SMAJ120A-E3/5A and 1.5KE120CA, SMC3K120CAHM3_A uniquely combines 3000 W surge capacity, AEC-Q101 qualification, SMT-ready SMC packaging, and bidirectional clamping - making it the only option qualified for modern automotive power rail protection without design compromise.
Availability
SMC3K120CAHM3_A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power interface modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SMC3K120CAHM3_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, and passive components for automotive, industrial, and computing markets.
The SMC3KxxCAHM3_A series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for AEC-Q101-compliant surge protection in harsh automotive environments - emphasizing low clamping, high surge endurance, and zero orientation sensitivity.
FAQ
What is the maximum clamping voltage of SMC3K120CAHM3_A under a 10/1000 μs surge?
The maximum clamping voltage of SMC3K120CAHM3_A is 193 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 15.5 A. This value is measured and guaranteed per Vishay Document Number 98241, ensuring predictable overvoltage limiting for downstream 200 V-rated components. The SMC3K120CAHM3_A maintains this clamping performance across its full operating temperature range (−55 °C to +175 °C).
Is SMC3K120CAHM3_A suitable for automotive applications requiring AEC-Q101 qualification?
Yes, SMC3K120CAHM3_A is fully AEC-Q101 qualified per Rev G test conditions, including temperature cycling, high-temperature reverse bias (HTRB), and mechanical shock. It is explicitly listed in Vishay's AEC-Q101 qualified products table and used in production automotive ECUs for ISO 7637-2 and ISO 16750-2 compliance. The SMC3K120CAHM3_A also carries UL 497B recognition (file E136766), supporting dual-certification requirements.
What is the standoff voltage and leakage current specification for SMC3K120CAHM3_A at 25 °C?
The standoff voltage (VWM) of SMC3K120CAHM3_A is 120 V, and its maximum reverse leakage current (ID) at this voltage and 25 °C is 1.0 μA. This tight leakage spec ensures minimal power loss in always-on automotive modules and prevents false triggering in high-impedance sensor circuits. The SMC3K120CAHM3_A maintains ≤1.0 μA leakage up to +125 °C, as confirmed in the Electrical Characteristics table of the official datasheet.
Does SMC3K120CAHM3_A have polarity markings on the package?
No, SMC3K120CAHM3_A has no polarity markings because it is a bidirectional TVS diode. Both terminals are functionally identical, allowing unrestricted orientation during automated pick-and-place assembly. This eliminates risk of misplacement and simplifies PCB layout - a key advantage over unidirectional alternatives like SMAJ120A-E3/5A. The SMC3K120CAHM3_A achieves symmetrical clamping in both directions without internal series diode configuration.
What package type and moisture sensitivity level does SMC3K120CAHM3_A use?
SMC3K120CAHM3_A uses the SMC (DO-214AB) surface-mount package with dimensions 7.75 mm × 6.22 mm × 2.62 mm and matte tin-plated leads. It meets MSL Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30 °C/85 % RH and withstand reflow peak temperatures up to 260 °C without baking. The SMC3K120CAHM3_A is supplied in 7″ tape-and-reel (850 units/reel) with code "/H" per Vishay's ordering nomenclature.
SMC3K120CAHM3_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):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- 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)
SMC3K120CAHM3_A/H FAQ
1.How can I place an order for SMC3K120CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K120CAHM3_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 SMC3K120CAHM3_A/H reliable?
The price and inventory of SMC3K120CAHM3_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 SMC3K120CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMC3K120CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K120CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K120CAHM3_A/H?
SMC3K120CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K120CAHM3_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 SMC3K120CAHM3_A/H?
For technical support, including SMC3K120CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K120CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K120CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K120CAHM3_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 SMC3K120CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMC3K120CAHM3_A/H?
All SMC3K120CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K120CAHM3_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 SMC3K120CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMC3K120CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K120CAHM3_A/H Tags
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