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Vishay General Semiconductor - Diodes Division SMC3K40CAHM3/9A
- Part No.:
- SMC3K40CAHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K40CAHM3/9A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,610
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Product details
Overview
SMC3K40CAHM3/9A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in the SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), with a standoff voltage of 40 V, breakdown voltage range 44.4–49.1 V, and clamping voltage of 64.5 V at 46.5 A peak surge current. It is AEC-Q101 qualified and used to protect automotive sensor signal lines and MOSFET gate drivers against inductive switching transients.
For engineers reviewing the SMC3K40CAHM3/9A datasheet, SMC3K40CAHM3/9A pinout, SMC3K40CAHM3/9A application, or SMC3K40CAHM3/9A equivalent, key selection criteria include bidirectional clamping capability, 150 °C maximum junction temperature, MSL level 1 moisture sensitivity, halogen-free RoHS-compliant construction, and compatibility with wave soldering only on PCB top side.
Technical Context
The SMC3K40CAHM3/9A operates as a silicon avalanche diode-based TVS, leveraging controlled reverse-biased breakdown to clamp transient overvoltages before they damage downstream ICs. Its low incremental surge resistance and fast response time ensure effective suppression of sub-microsecond transients induced by inductive load switching.
Designed for automotive-grade reliability, it meets AEC-Q101 stress test requirements and UL 497B safety recognition (E136766). The HM3 suffix confirms halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance and qualification for harsh-environment applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 3000 W (10/1000 μs waveform) - sustains high-energy surges without failure in automotive load-dump or ISO 7637-2 scenarios |
| Standoff Voltage (VWM) | 40 V - ensures no conduction during normal 36 V automotive system operation |
| Breakdown Voltage (VBR) | 44.4–49.1 V at 1 mA - defines onset of clamping with tight tolerance for predictable protection threshold |
| Clamping Voltage (VC) | 64.5 V at 46.5 A - limits maximum voltage seen by protected circuit under full-rated surge |
| Junction Temperature Range | −55 °C to +150 °C - supports under-hood deployment in engine control units and body electronics |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad area for thermal dissipation |
| Polarity | Bidirectional - protects AC-coupled or differential signal paths without polarity constraints |
Pinout & Package
SMC3K40CAHM3/9A uses the standard SMC (DO-214AB) package: molded plastic case with two coplanar matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Anode/Cathode terminal pair | Identical electrical function in bidirectional mode; terminals interchangeable in layout |
| Anode (unmarked end) | Anode/Cathode terminal pair | No functional distinction from cathode; symmetric clamping behavior across both terminals |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements including HTGB, TCT, and H3TRB |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/85 % RH - no bake required prior to reflow |
| UL 497B recognition | E136766 file number - certified for use in safety-critical surge protection circuits |
| Halogen-free & RoHS | HM3 suffix denotes compliance with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU |
| Low incremental surge resistance | Enables tighter clamping voltage margin versus competing TVS devices at same power rating |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protects microcontroller GPIOs and LIN bus transceivers from load-dump and jump-start transients in BCMs. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed directly at connector interface before ESD diode array. Use Value: Clamps 3000 W surges to ≤64.5 V while maintaining 40 V standoff-prevents latch-up in 5 V/3.3 V logic interfaces. |
Use Scenario: Shields 24 V DC digital input channels in programmable logic controllers from relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Primary surge suppression device mounted at DIN-rail I/O terminal block entry point. Use Value: Withstands repeated 10/1000 μs surges up to 46.5 A without degradation-extends field service life beyond 10 years. |
| Automotive Sensor Signal Conditioning | Telecom Power Interface |
Use Scenario: Safeguards analog outputs of pressure and temperature sensors connected to engine control units. IC Role / Device Role / Timing Role: Low-capacitance TVS placed adjacent to op-amp output stage to avoid signal distortion. Use Value: Bidirectional clamping preserves signal integrity on differential sensor pairs without polarity-sensitive routing. |
Use Scenario: Protects 48 V DC power inputs of telecom remote radio units from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage transient suppressor upstream of DC-DC converter and hot-swap controller. Use Value: 150 °C max junction temperature enables operation inside sealed outdoor enclosures with passive cooling only. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K40CAHM3_A | Same electrical specs; updated revision with enhanced surge lifetime testing per AEC-Q101 rev G | Approved for new designs; replaces legacy SMC3K40CAHM3/9A in production ramp | Select for long-term supply continuity and latest qualification evidence |
| SMAJ40CA | Lower peak power (400 W), smaller SMA package, higher clamping ratio (VC/VWM = 1.75 vs. 1.61) | Suitable for space-constrained consumer electronics but not automotive or industrial surge classes | Use only where 3000 W rating is unnecessary and board area is critical |
Compared with SMC3K40CAHM3/9A, SMC3K40CAHM3_A offers identical performance with improved long-term reliability validation, while SMAJ40CA trades robustness for footprint reduction-making the former ideal for automotive upgrades and the latter acceptable only in non-critical, low-energy environments.
Availability
SMC3K40CAHM3/9A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input stages, and telecom power interface protection requiring stable component supply and traceable sourcing.
Supply support for SMC3K40CAHM3/9A 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, efficiency, and application-specific optimization.
The SMC3KxxCA series was engineered for high-power transient suppression in automotive and industrial systems, delivering 3000 W surge handling in compact SMC packages with AEC-Q101 and UL safety certifications.
FAQ
What does the 'HM3' suffix mean in SMC3K40CAHM3/9A?
The HM3 suffix in SMC3K40CAHM3/9A indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. It distinguishes this automotive-grade variant from commercial-grade M3 versions and confirms compliance with stringent environmental and reliability standards required for under-hood applications.
Is SMC3K40CAHM3/9A suitable for bottom-side wave soldering?
No, SMC3K40CAHM3/9A is explicitly not recommended for PCB bottom-side wave mounting per Vishay documentation. Its thermal mass and package geometry require top-side placement to ensure reliable solder joint formation and avoid delamination or voiding during wave soldering processes.
What is the maximum clamping voltage for SMC3K40CAHM3/9A at rated surge current?
The maximum clamping voltage for SMC3K40CAHM3/9A is 64.5 V at 46.5 A peak pulse current (10/1000 μs waveform). This value is measured under standardized test conditions and represents the upper limit of voltage imposed on protected circuitry during full-rated transient events.
Does SMC3K40CAHM3/9A have polarity markings on the package?
No, SMC3K40CAHM3/9A does not have polarity markings because it is a bidirectional TVS device. Both terminals are functionally identical, and the device provides symmetrical clamping in either direction-eliminating the need for orientation-specific placement on the PCB.
How does SMC3K40CAHM3/9A differ from SMC3K40CA-M3/9A?
SMC3K40CAHM3/9A is AEC-Q101 qualified and intended for automotive applications, whereas SMC3K40CA-M3/9A is commercial grade without automotive qualification. Both share identical electrical parameters and SMC packaging, but only SMC3K40CAHM3/9A meets the extended temperature, humidity, and lifetime stress tests required for automotive deployment.
SMC3K40CAHM3/9A 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMC3K40CAHM3/9A FAQ
1.How can I place an order for SMC3K40CAHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K40CAHM3/9A 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 SMC3K40CAHM3/9A reliable?
The price and inventory of SMC3K40CAHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K40CAHM3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K40CAHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K40CAHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K40CAHM3/9A?
SMC3K40CAHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K40CAHM3/9A 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 SMC3K40CAHM3/9A?
For technical support, including SMC3K40CAHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K40CAHM3/9A requirements.
6.How does Aetrix verify that SMC3K40CAHM3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K40CAHM3/9A 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 SMC3K40CAHM3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K40CAHM3/9A?
All SMC3K40CAHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K40CAHM3/9A, 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 SMC3K40CAHM3/9A part is unused and in its original packaging.
Return procedure for SMC3K40CAHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K40CAHM3/9A Tags
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