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Vishay General Semiconductor - Diodes Division SMC3K40CAHM3/57
- Part No.:
- SMC3K40CAHM3/57
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K40CAHM3/57.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,279
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Product details
Overview
SMC3K40CAHM3/57 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 44.4–49.1 V breakdown voltage, and 40 V stand-off voltage. It provides clamping protection for automotive sensor signal lines, MOSFET gate drivers, and industrial I/O interfaces against ESD and load-switching transients.
For engineers reviewing the SMC3K40CAHM3/57 datasheet, SMC3K40CAHM3/57 pinout, SMC3K40CAHM3/57 application, or SMC3K40CAHM3/57 equivalent, key selection criteria include AEC-Q101 qualification, bidirectional polarity, 64.5 V max clamping voltage at 46.5 A surge current, MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector with fast response time (<1 ns) and low incremental surge resistance, enabling effective suppression of inductive switching spikes and lightning-induced surges on DC power rails and analog/sensor signal paths. Its bidirectional configuration supports AC-coupled or floating-line protection without polarity constraints.
The device is thermally rated for junction temperatures from –55 °C to +150 °C and derates linearly above 25 °C ambient per Figure 2 in the datasheet. It meets UL 497B safety recognition (E136766) and JESD201 Class 2 whisker resistance requirements, confirming suitability for high-reliability automotive and industrial deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 44.4 V / 49.1 V - Ensures reliable triggering above 40 V system operating voltage while avoiding false trips during normal transients. |
| VWM | 40 V - Maximum continuous reverse working voltage; defines safe DC bias margin before leakage rises significantly. |
| VC @ IPPM | 64.5 V - Clamped voltage at 46.5 A peak pulse current; determines maximum stress imposed on protected downstream ICs. |
| PPPM | 3000 W - Peak pulse power handling with 10/1000 μs waveform; supports robust protection against ISO 7637-2 Pulse 1/2a/5a events. |
| IPPM | 46.5 A - Peak surge current capability; sets minimum trace width and PCB layout clearance for transient energy dissipation. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and enclosed industrial enclosures without thermal shutdown. |
| Polarity | Bidirectional - Allows single-device protection of AC signals, differential buses (e.g., CAN, RS-485), or ungrounded sensor outputs. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H). MSL Level 1, reflow compatible up to 260 °C peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Common node for bidirectional clamping | Internally connected to both P-N junctions; functions as symmetric terminal-no functional distinction between anode/cathode in bidirectional mode. |
| Anode (unmarked end) | Common node for bidirectional clamping | Electrically identical to cathode terminal; polarity marking omitted per datasheet note for bidirectional types. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per JESD47. |
| 3000 W peak pulse power (10/1000 μs) | Supports compliance with ISO 16750-2 and ISO 7637-2 test pulses without degradation over lifetime. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., <100 ns edges), improving protection fidelity for high-speed interfaces. |
| UL 497B recognized (E136766) | Confirms safety compliance for telecom and industrial equipment requiring third-party certification for surge protection circuits. |
| Halogen-free, RoHS-compliant, HM3 suffix | Meets automotive OEM material restrictions (e.g., GMW3172, Ford WSS-M99P9999-A1) and EU environmental directives. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of engine coolant temperature (ECT) and manifold absolute pressure (MAP) sensors from load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor placed across sensor supply and ground, clamping surges before they reach precision ADC front-end. Use Value: Prevents sensor output corruption and microcontroller reset events by limiting transient voltage to ≤64.5 V during 46.5 A surges. | Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Bidirectional TVS mounted at connector entry point, absorbing both positive and negative polarity transients induced by inductive switching. Use Value: Eliminates need for separate unidirectional devices per line, reducing BOM count and PCB area while maintaining IEC 61000-4-5 Level 3 immunity. |
| Automotive CAN Bus Protection | Consumer Power Adapter Input Stage |
Use Scenario: Guarding CAN_H/CAN_L differential pair in body control modules against ESD (±15 kV contact) and ISO 10605 pulses. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed across bus lines to clamp common-mode surges without distorting signal integrity. Use Value: Maintains CAN bit timing accuracy (≤1 ns jitter impact) due to sub-100 pF junction capacitance at zero bias. | Use Scenario: Secondary-side overvoltage protection in USB-C PD adapters after synchronous rectification, preventing damage to USB-PD controller ICs. IC Role / Device Role / Timing Role: Standoff-rated TVS on 20 V output rail, triggered only during fault conditions (e.g., feedback loop failure or Zener open). Use Value: Limits output excursion to 64.5 V during sustained overvoltage, preserving downstream USB port electronics and meeting UL 62368-1 fault containment requirements. |
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/57 | Same electrical specs and AEC-Q101 qualification; updated revision with enhanced process control and tighter VBR distribution (±5 % vs. ±6.5 %). | No functional change; intended for new designs replacing legacy SMC3K40CAHM3/57 in automotive programs. | Select SMC3K40CAHM3_A/57 for new designs requiring latest qualification and statistical process control. |
| SMAJ40AHE3/57T | Lower peak power (400 W), smaller SMA package (DO-214AC), unidirectional only, no AEC-Q101 rating. | Suitable for cost-sensitive consumer electronics where automotive reliability and 3000 W surge handling are not required. | Choose SMAJ40AHE3/57T only for non-automotive, low-energy transient environments with space-constrained layouts. |
Compared with SMC3K40CAHM3/57, SMC3K40CAHM3_A/57 offers improved manufacturing consistency for high-volume automotive production, while SMAJ40AHE3/57T trades surge robustness and qualification for footprint reduction and lower unit cost in commercial applications.
Availability
SMC3K40CAHM3/57 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and CAN bus interface designs requiring stable component supply, AEC-Q101 qualification, and 3000 W transient immunity.
Supply support for SMC3K40CAHM3/57 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 family targets high-energy transient suppression in harsh environments, designed specifically for automotive powertrain and chassis systems, industrial automation, and telecom infrastructure where AEC-Q101 compliance and 3000 W surge capability are mandatory.
FAQ
What is the clamping voltage of the SMC3K40CAHM3/57 at its rated peak pulse current?
The SMC3K40CAHM3/57 has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current (IPPM) of 46.5 A using a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components experience controlled overvoltage stress during surge events. The SMC3K40CAHM3/57 maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C), with minor derating above 25 °C ambient.
Is the SMC3K40CAHM3/57 suitable for new automotive designs?
No-the SMC3K40CAHM3/57 is marked "Not for New Designs" in the Vishay datasheet (Rev. 13-Sep-2022), with SMC3K40CAHM3_A/57 designated as the recommended replacement. While SMC3K40CAHM3/57 remains available for legacy production and repair, new automotive programs should use SMC3K40CAHM3_A/57 to ensure access to updated process controls, tighter parameter distributions, and continued long-term support. The SMC3K40CAHM3/57 retains full AEC-Q101 qualification and identical electrical specs.
What does the "HM3" suffix indicate in SMC3K40CAHM3/57?
"HM3" denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD201 Class 2 whisker resistance. It distinguishes the automotive-grade version from the commercial "M3" variant (e.g., SMC3K40CA-M3/57), which lacks AEC-Q101 validation and is intended for non-automotive applications. Both share the same SMC (DO-214AB) package, 3000 W rating, and electrical characteristics, but only HM3 meets automotive OEM material and reliability requirements.
Can the SMC3K40CAHM3/57 be used in bidirectional AC signal protection?
Yes-the SMC3K40CAHM3/57 is specified for bidirectional polarity only and is explicitly designed for AC-coupled or floating-line protection, including differential buses like CAN, RS-485, and audio lines. Its symmetrical VBR and VC characteristics ensure equal clamping performance for positive and negative transients. No polarity marking is applied to the device, and both terminals function identically, making it ideal for protecting balanced signal paths without external circuitry.
What is the maximum printed circuit board temperature rise allowed during reflow soldering of SMC3K40CAHM3/57?
The SMC3K40CAHM3/57 is rated for MSL Level 1 per J-STD-020 and supports lead-free reflow profiles with a maximum peak temperature of 260 °C. Its molding compound meets UL 94 V-0 flammability rating, and thermal performance is validated for standard 60-second exposure above liquidus (217–220 °C). Board-level thermal design must maintain local copper pad temperature below 260 °C at the device terminations; the SMC3K40CAHM3/57 itself exhibits no degradation when processed within these limits.
SMC3K40CAHM3/57 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)
SMC3K40CAHM3/57 FAQ
1.How can I place an order for SMC3K40CAHM3/57 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K40CAHM3/57 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 SMC3K40CAHM3/57 reliable?
The price and inventory of SMC3K40CAHM3/57 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K40CAHM3/57 is usually 5 days.
3.What payment methods are accepted for SMC3K40CAHM3/57?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K40CAHM3/57 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K40CAHM3/57?
SMC3K40CAHM3/57 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K40CAHM3/57 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 SMC3K40CAHM3/57?
For technical support, including SMC3K40CAHM3/57 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K40CAHM3/57 requirements.
6.How does Aetrix verify that SMC3K40CAHM3/57 is sourced from the original manufacturer or authorized distributors?
All SMC3K40CAHM3/57 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 SMC3K40CAHM3/57 meets industry standards.
7.What is the process for return or replacement of SMC3K40CAHM3/57?
All SMC3K40CAHM3/57 units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K40CAHM3/57, 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 SMC3K40CAHM3/57 part is unused and in its original packaging.
Return procedure for SMC3K40CAHM3/57:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K40CAHM3/57 Tags
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