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Vishay General Semiconductor - Diodes Division SMC3K40CAHM3_A/H
- Part No.:
- SMC3K40CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K40CAHM3_A/H.pdf
- Description:
- 3KW, 40V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:1,740
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Product details
Overview
SMC3K40CAHM3_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), 40 V stand-off voltage (VWM), and 64.5 V maximum clamping voltage at 46.5 A IPPM - deployed on automotive power lines and sensor interfaces to suppress ISO 7637-2 Pulse 1/2a/3a/3b transients.
For engineers reviewing the SMC3K40CAHM3_A datasheet, SMC3K40CAHM3_A pinout, SMC3K40CAHM3_A application, or SMC3K40CAHM3_A equivalent, this device serves as an AEC-Q101-qualified, UL 497B-recognized, halogen-free TVS for robust ESD (30 kV HBM) and load-dump transient suppression in 12 V battery systems.
Technical Context
This bidirectional TVS operates without polarity marking and delivers low incremental surge resistance for rapid clamping response under fast-rising transients (e.g., ISO 16750-2 Pulse b). Its junction-to-mount thermal resistance of 4.0 °C/W enables effective heat dissipation during repetitive surge events.
The device meets J-STD-020 MSL Level 1 (260 °C peak reflow), supports solderability per J-STD-002 and JESD 22-B102, and passes JESD 201 Class 2 whisker testing - confirming suitability for automated SMT assembly in automotive-grade production.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V automotive supply rails. |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - breakdown voltage range ensures reliable turn-on across process variation and temperature. |
| VC @ IPPM | 64.5 V at 46.5 A (10/1000 μs) - clamping voltage limits downstream IC stress during 3 kW surges. |
| PPPM | 3000 W (10/1000 μs) - peak pulse power rating validated per ANSI/IEEE C62.35, enabling protection against ISO 7637-2 Pulse 1 (−150 V). |
| ESD Rating | 30 kV contact/air (IEC 61000-4-2) - protects signal paths from human-body-model electrostatic discharge without external circuitry. |
| TJ max | 175 °C - extended junction temperature range supports under-hood automotive deployment with no derating up to +125 °C ambient. |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height for high-power density PCB layout. |
Pinout & Package
SMC3K40CAHM3_A uses a 2-terminal SMC (DO-214AB) package with unmarked, symmetrical leads - polarity is irrelevant due to bidirectional operation. Terminals are matte tin-plated for compatibility with lead-free reflow profiles and J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals conduct identically during positive/negative surges; no orientation required during placement. |
| Cathode Band (absent) | Polarity indicator | Not present - confirms bidirectional functionality; eliminates risk of incorrect orientation in layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress-test requirements including temperature cycling, HTRB, and ESD - enables use in engine control, ADAS, and body modules. |
| UL 497B recognition (E136766) | Confirms safety compliance for telecom and industrial signal-line protection without additional certification overhead. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC JS709E standards - supports green manufacturing and export compliance for global OEMs. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage exposure to protected ICs - critical for safeguarding 40 V-rated CAN transceivers and LIN controllers. |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak - simplifies SMT line integration without baking or dry-pack handling. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Installed across 12 V battery feed to ECUs to absorb load dump pulses per ISO 16750-2 Pulse b (101 V, 400 ms). IC Role / Device Role / Timing Role: Primary clamping element that diverts >95 % of surge current away from DC-DC converters and microcontrollers. Use Value: Limits peak rail voltage to ≤64.5 V during 46.5 A transients, preventing latch-up or gate oxide damage in downstream semiconductors. |
Use Scenario: Placed on analog output lines of pressure/temperature sensors in factory automation PLCs exposed to relay-switching noise. IC Role / Device Role / Timing Role: Fast-response shunt protector that clamps sub-100 ns spikes induced by inductive solenoid switching. Use Value: Maintains signal integrity below ±5 V error band during 3000 W transients, preserving 12-bit ADC accuracy without filtering delay. |
| Automotive CAN Bus Protection | Telecom Signal Line Protection |
Use Scenario: Mounted on CAN_H/CAN_L differential pair near connector entry in infotainment head units subjected to ISO 7637-2 Pulse 3b (150 V, 150 ns). IC Role / Device Role / Timing Role: Bidirectional clamp limiting common-mode surge energy before it couples into transceiver inputs. Use Value: Clamps to ≤64.5 V within <1 ns, preventing CAN controller reset while maintaining bus timing compliance (dominant/recessive edge integrity). |
Use Scenario: Applied to RS-485 data lines in base station remote radio units facing lightning-induced surges per IEC 61000-4-5 (8/20 μs). IC Role / Device Role / Timing Role: High-power front-end suppressor absorbing up to 30 kW (8/20 μs) before secondary protection stages. Use Value: Enables 84.0 V clamping at 357 A, reducing secondary TVS stress and extending system-level surge survivability beyond 10,000 cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CA | Lower PPPM (400 W), SMA package (smaller thermal mass), higher RthJA (150 °C/W). | Limited to low-energy transients (e.g., IEC 61000-4-2 only); unsuitable for ISO 16750-2 load dump. | Select when board space is constrained and surge energy does not exceed 400 W. |
| SMCJ40CA | Same SMC package but non-AEC-Q101, no UL 497B recognition, and lower ESD rating (25 kV). | Acceptable for industrial/commercial use but fails automotive qualification requirements. | Choose only for cost-sensitive non-automotive designs where AEC-Q101 and UL are not mandated. |
Compared with SMC3K40CAHM3_A, SMAJ40CA offers smaller footprint but sacrifices 87 % peak power handling and thermal robustness, while SMCJ40CA matches mechanical fit but lacks automotive qualification and safety certification - making SMC3K40CAHM3_A the sole option meeting full AEC-Q101 + UL + 3000 W requirements.
Availability
SMC3K40CAHM3_A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface hardening, and telecom infrastructure surge protection requiring stable component supply across multi-year production cycles.
Supply support for SMC3K40CAHM3_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 was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing high clamping efficiency, low thermal resistance, and zero-defect SMT manufacturability.
FAQ
What is the maximum clamping voltage of SMC3K40CAHM3_A at its rated peak pulse current?
The SMC3K40CAHM3_A clamps to a maximum of 64.5 V at its specified peak pulse current of 46.5 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for protected circuits during standardized surge events.
Is SMC3K40CAHM3_A qualified for automotive applications?
Yes, SMC3K40CAHM3_A is fully AEC-Q101 qualified and explicitly listed as such in the Vishay document 98241. It has passed stress tests including high-temperature reverse bias, temperature cycling, and ESD per JESD22-A114 - making it suitable for under-hood and chassis-mounted automotive electronics where reliability is mission-critical.
Does SMC3K40CAHM3_A have polarity markings on the package?
No, SMC3K40CAHM3_A has no polarity markings because it is a bidirectional TVS diode. The SMC (DO-214AB) package features symmetrical terminals with identical electrical behavior for both positive and negative transients - eliminating orientation concerns during PCB layout and automated placement.
What is the thermal resistance from junction to mount for SMC3K40CAHM3_A?
The junction-to-mount thermal resistance (RthJM) of SMC3K40CAHM3_A is 4.0 °C/W, measured using the Transient Dual Interface Method (TDIM) per JEDEC 51-14. This low value enables efficient heat transfer to the PCB copper pour or heatsink, supporting sustained surge duty cycles in thermally demanding automotive applications.
Which industry standards does SMC3K40CAHM3_A meet for surge immunity?
SMC3K40CAHM3_A meets ISO 7637-2 (Pulse 1, 2a, 3a, 3b), ISO 16750-2 (Pulse b), and IEC 61000-4-2 (30 kV HBM/contact and air discharge). These certifications are documented in the Vishay datasheet and verified through third-party lab testing, confirming suitability for automotive and industrial EMC compliance programs.
SMC3K40CAHM3_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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 46.5A
- Power - Peak Pulse:
- 3000W (3kW)
- 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)
SMC3K40CAHM3_A/H FAQ
1.How can I place an order for SMC3K40CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K40CAHM3_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 SMC3K40CAHM3_A/H reliable?
The price and inventory of SMC3K40CAHM3_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 SMC3K40CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMC3K40CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K40CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K40CAHM3_A/H?
SMC3K40CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K40CAHM3_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 SMC3K40CAHM3_A/H?
For technical support, including SMC3K40CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K40CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K40CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K40CAHM3_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 SMC3K40CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMC3K40CAHM3_A/H?
All SMC3K40CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K40CAHM3_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 SMC3K40CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMC3K40CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K40CAHM3_A/H Tags
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