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Vishay General Semiconductor - Diodes Division SMC3K45CAHM3/9A
- Part No.:
- SMC3K45CAHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K45CAHM3/9A.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,360
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Product details
Overview
SMC3K45CAHM3/9A from Vishay General Semiconductor is a bidirectional surface-mount TRANSZORB® transient voltage suppressor in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 45 V standoff voltage, 50.0–55.3 V breakdown voltage at 1 mA, and 72.7 V maximum clamping voltage at 41.3 A peak surge current. It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial electronics.
For engineers reviewing the SMC3K45CAHM3/9A datasheet, SMC3K45CAHM3/9A pinout, SMC3K45CAHM3/9A application, or SMC3K45CAHM3/9A equivalent, key selection criteria include bidirectional clamping capability, 150 °C max junction temperature, halogen-free RoHS-compliant construction with HM3 suffix, and compatibility with wave-soldering restrictions on PCB bottom side mounting.
Technical Context
The SMC3K45CAHM3/9A operates as a voltage-clamping TVS diode with symmetrical bidirectional avalanche breakdown behavior, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its low incremental surge resistance and fast response time ensure effective suppression of sub-microsecond transients induced by relay switching or motor commutation.
Designed for high-reliability environments, it meets J-STD-020 MSL Level 1 moisture sensitivity, withstands 260 °C lead-free reflow peak temperature, and passes JESD 201 Class 2 whisker testing - all verified under AEC-Q101 stress qualification for automotive-grade deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before leakage exceeds 2 μA; defines safe working range for protected circuitry. |
| VBR min/max | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown threshold window ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 72.7 V at 41.3 A - Clamping voltage under full 3000 W surge, limiting stress on downstream components. |
| PPPM | 3000 W (10/1000 μs) - Peak pulse power handling capacity validated per ANSI/IEEE C62.35 waveform standards. |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive or high-ambient industrial settings. |
| Polarity | Bidirectional - Enables single-device protection of AC signals, differential buses, or ungrounded lines without orientation constraints. |
| Qualification | AEC-Q101 qualified - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H). No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Transient conduction path (bidirectional) | Both terminals function identically as symmetrical avalanche junctions; no fixed cathode/anode designation in bidirectional mode. |
| Anode (Cathode) | Transient conduction path (bidirectional) | Identical electrical role to opposite terminal; device conducts equally in either direction above VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 3000 W peak pulse power | Enables robust protection against severe load dump or ESD-like surges without derating in compact SMC footprint. |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body control, and ADAS modules requiring long-term field stability. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking, simplifying manufacturing logistics. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental compliance mandates while maintaining thermal and mechanical performance equivalence to legacy M3 variants. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs and ICs. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients up to ±120 V during alternator regulation failure. IC Role / Device Role / Timing Role: Primary clamping element placed across power rail input prior to DC/DC converter stage. Use Value: Limits rail voltage to ≤72.7 V during 3000 W surge, preventing overvoltage shutdown or permanent damage to downstream regulators and microcontrollers. | Use Scenario: Safeguarding analog output lines of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional shunt protector on 4–20 mA current loop or 0–10 V analog output traces. Use Value: Clamps both positive and negative transients induced by nearby motor drives or solenoid switching, preserving signal integrity and ADC accuracy. |
| Consumer Appliance Motor Control | Telecom Line Interface Protection |
Use Scenario: Suppressing commutation spikes from universal motor drivers in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor winding terminals or H-bridge outputs. Use Value: Absorbs repetitive 3000 W pulses without degradation, extending MOSFET lifetime and eliminating false fault triggers in motor driver ICs. | Use Scenario: Shielding RS-485 transceiver I/O pins from lightning-induced surges on outdoor telecom backhaul links. IC Role / Device Role / Timing Role: First-stage transient clamp on differential bus lines before isolation or receiver input. Use Value: Maintains <72.7 V common-mode clamping level across full 41.3 A surge, preventing latch-up in isolated transceivers compliant with IEC 61000-4-5 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K45CAHM3_A | Same electrical specs and AEC-Q101 qualification; differs only in part numbering convention (underscore suffix denotes updated packaging documentation). | No functional difference; identical use in automotive and industrial designs requiring HM3-grade reliability. | Select SMC3K45CAHM3_A when sourcing from distributors listing underscored nomenclature; electrically interchangeable with SMC3K45CAHM3/9A. |
| SMBJ45CAHM3 | Lower 600 W peak pulse power (vs. 3000 W), SMB (DO-214AA) package (smaller footprint, lower thermal mass). | Suitable for lower-energy transients (e.g., ESD-only protection); not recommended for load dump or high-current inductive switching. | Choose SMBJ45CAHM3 only where surge energy is confirmed ≤600 W; verify thermal derating margins in high-ambient environments. |
Compared with SMC3K45CAHM3/9A, SMC3K45CAHM3_A offers identical performance with minor documentation alignment, while SMBJ45CAHM3 trades 80 % pulse power capacity for smaller board area - making the former ideal for AEC-Q101-compliant high-energy protection and the latter appropriate for space-constrained, lower-risk applications.
Availability
SMC3K45CAHM3/9A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, consumer appliance motor control, and telecom line protection requiring stable component supply and long-term lifecycle support.
Supply support for SMC3K45CAHM3/9A 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 SMC3KxxCAHM3 series belongs to Vishay's automotive-qualified TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh-environment electronics where AEC-Q101 validation and 3000 W surge immunity are mandatory.
FAQ
What does the "HM3" suffix indicate in SMC3K45CAHM3/9A?
The HM3 suffix in SMC3K45CAHM3/9A specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. It distinguishes this grade from commercial M3 variants and confirms suitability for automotive and high-reliability industrial applications. The SMC3K45CAHM3/9A meets UL 497B safety recognition and MSL Level 1 handling requirements.
Is SMC3K45CAHM3/9A suitable for protecting CAN bus lines?
SMC3K45CAHM3/9A is not optimized for CAN FD or high-speed CAN bus protection due to its relatively high clamping voltage (72.7 V) and junction capacitance - which may distort signal edges above 1 Mbps. For CAN-specific protection, lower-capacitance, lower-VC TVS arrays such as Vishay's ESD9L5.0 or SMBJ5.0CAHM3 are recommended. The SMC3K45CAHM3/9A remains appropriate for power rail or chassis-ground surge suppression in CAN node subsystems.
What is the maximum allowable PCB temperature during reflow for SMC3K45CAHM3/9A?
The SMC3K45CAHM3/9A supports lead-free reflow with a maximum peak temperature of 260 °C per J-STD-020 MSL Level 1, and requires no pre-baking due to unlimited floor life. Its molding compound meets UL 94 V-0 flammability rating, and thermal performance is validated across -55 °C to +150 °C junction range. Always confirm profile compliance using actual board thermal mass and local process validation for the SMC3K45CAHM3/9A.
Does SMC3K45CAHM3/9A have polarity markings on the package?
No, SMC3K45CAHM3/9A has no polarity markings because it is a bidirectional TVS diode - both terminals perform identically during transient suppression. The device uses symmetrical avalanche junctions and functions identically regardless of orientation on the PCB. This eliminates assembly errors and simplifies layout for AC-coupled or floating signal paths where polarity assignment is undefined.
How does SMC3K45CAHM3/9A compare to older SMC3K45CA-M3/9A in terms of performance?
SMC3K45CAHM3/9A delivers identical electrical performance (VWM, VBR, VC, PPPM) and thermal ratings as SMC3K45CA-M3/9A but adds AEC-Q101 qualification, JESD 201 Class 2 whisker resistance, and enhanced process controls for automotive use. The HM3 variant replaces the M3 in new designs where qualification and long-term reliability are required. Both share the same SMC (DO-214AB) package and pinout, making SMC3K45CAHM3/9A a drop-in upgrade for legacy M3-based systems needing certification uplift.
SMC3K45CAHM3/9A 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 41.3A
- 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)
SMC3K45CAHM3/9A FAQ
1.How can I place an order for SMC3K45CAHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K45CAHM3/9A 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 SMC3K45CAHM3/9A reliable?
The price and inventory of SMC3K45CAHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K45CAHM3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K45CAHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K45CAHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K45CAHM3/9A?
SMC3K45CAHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K45CAHM3/9A 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 SMC3K45CAHM3/9A?
For technical support, including SMC3K45CAHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K45CAHM3/9A requirements.
6.How does Aetrix verify that SMC3K45CAHM3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K45CAHM3/9A 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 SMC3K45CAHM3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K45CAHM3/9A?
All SMC3K45CAHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K45CAHM3/9A, 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 SMC3K45CAHM3/9A part is unused and in its original packaging.
Return procedure for SMC3K45CAHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K45CAHM3/9A Tags
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