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Vishay General Semiconductor - Diodes Division SMC3K45CAHM3_A/I
- Part No.:
- SMC3K45CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K45CAHM3_A/I.pdf
- Description:
- 3KW, 45V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,195
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Product details
Overview
SMC3K45CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, designed for automotive and industrial electronics protection. It features 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR), 72.7 V clamping voltage at 41.3 A (10/1000 μs), 3000 W peak pulse power, and AEC-Q101 qualification - deployed on power rails and signal lines of automotive ECUs to suppress ISO 7637-2 Pulse 1/2a/3a/3b transients.
For engineers reviewing the SMC3K45CAHM3_A datasheet, SMC3K45CAHM3_A pinout, SMC3K45CAHM3_A application, or SMC3K45CAHM3_A equivalent, key selection criteria include clamping performance under 10/1000 μs and 8/20 μs waveforms, bidirectional surge handling up to 317 A (8/20 μs), junction temperature rating to +175 °C, and compliance with IEC 61000-4-2 (±30 kV ESD) and ISO 16750-2 Pulse b load dump.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds its breakdown threshold (50.0–55.3 V), it avalanches rapidly (<1 ns response) to divert surge current away from downstream ICs or MOSFETs. Its low incremental surge resistance ensures stable clamping under high-current pulses like ISO 7637-2 Pulse 1 (−150 V, 2 ms).
Designed for harsh environments, SMC3K45CAHM3_A sustains operation from −55 °C to +175 °C junction temperature, meets MSL Level 1 reflow (260 °C peak), and passes JESD 201 Class 2 whisker testing. Its halogen-free, RoHS-compliant SMC package supports automated assembly and provides UL 497B safety recognition (E136766).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 45 V - maximum continuous reverse operating voltage before conduction begins; defines safe DC/AC rail margin for 12 V/24 V automotive systems. |
| VBR (Breakdown Voltage) | 50.0–55.3 V at 1 mA - precise avalanche initiation range ensuring predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 72.7 V at 41.3 A (10/1000 μs) - limits peak voltage seen by protected circuitry during standardized surge tests. |
| PPPM (Peak Pulse Power) | 3000 W (10/1000 μs) - energy-handling capacity sufficient for ISO 7637-2 Pulse 1 and Pulse 2a transients in vehicle networks. |
| IPPM (Peak Pulse Current) | 41.3 A (10/1000 μs); 317 A (8/20 μs) - quantifies maximum single-pulse surge current the device can safely clamp without degradation. |
| TJ max. | +175 °C - enables reliable operation in under-hood automotive locations and industrial enclosures with high ambient temperatures. |
| ESD Rating | ±30 kV (IEC 61000-4-2, contact/air) - protects against human-body-model electrostatic discharge during handling and system integration. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H), matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Anode-side terminal (non-marked end) | For bidirectional devices, both terminals are functionally symmetric; no cathode/anode designation - either lead connects to protected line or ground reference. |
| Anode (A) | Cathode-side terminal (non-marked end) | Same electrical role as K terminal; bidirectional conduction means both terminals conduct equally during positive or negative transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating signal lines and dual-rail supplies without polarity constraints - eliminates need for discrete back-to-back diode arrangements. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for ECU, ADAS, and body control module deployment. |
| 30 kW surge capability (8/20 μs) | Handles high-energy lightning-induced surges per IEC 61000-4-5 Level 4 - suitable for telecom infrastructure and industrial fieldbus interfaces. |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes voltage overshoot during fast transients - preserves timing margins and prevents latch-up in 3.3 V/5 V logic interfaces downstream. |
| UL 497B recognition (E136766) | Meets safety agency requirements for secondary-circuit surge protection - simplifies end-equipment certification for industrial and medical applications. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Installed across battery feed to engine control unit (ECU) to suppress load dump (ISO 16750-2 Pulse b) and inductive switching spikes (ISO 7637-2 Pulse 1/2a). IC Role / Device Role / Timing Role: Shunt-type transient suppressor that clamps voltage within 1 ns to protect MCU, CAN transceivers, and power management ICs from destructive overvoltage. Use Value: Limits peak rail voltage to ≤72.7 V during 41.3 A transients, preventing brownout resets and gate oxide damage in 45 V-rated power stages. |
Use Scenario: Placed on analog input lines of pressure/temperature sensors in factory automation PLCs exposed to motor drive noise and relay switching. IC Role / Device Role / Timing Role: Bidirectional voltage clamp on differential or single-ended sensor outputs to prevent ESD and fast transient coupling into ADC front-ends. Use Value: Maintains signal integrity with <1 pF junction capacitance at zero bias, avoiding bandwidth reduction in 100 kHz sensor bandwidth paths. |
| Telecom Line Surge Protection | Consumer Power Adapter Input Protection |
|
Use Scenario: Mounted on Ethernet PHY or RS-485 bus lines in outdoor telecom cabinets subjected to lightning-induced surges (IEC 61000-4-5 8/20 μs). IC Role / Device Role / Timing Role: Primary-level surge diverter absorbing up to 317 A (8/20 μs) before secondary protection activates. Use Value: Delivers 30 kW peak pulse power handling - exceeds IEC 61000-4-5 Level 4 requirement (4 kV line-earth) with margin for repeated strikes. |
Use Scenario: Integrated into AC-DC adapter input stage to meet IEC 61000-4-2 ESD immunity (±30 kV) and EN 61000-4-4 EFT requirements. IC Role / Device Role / Timing Role: Fast-response TVS placed after bridge rectifier to clamp line-to-line and line-to-ground transients before bulk capacitor. Use Value: Withstands 1000+ ESD events without parameter shift due to robust silicon structure and MSL Level 1 reflow compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA | Same VWM (45 V), lower PPPM (400 W), SMA package (smaller footprint, higher thermal resistance). | Limited to low-energy consumer applications; unsuitable for ISO 7637-2 Pulse 1 or automotive load dump. | Select SMC3K45CAHM3_A where 3000 W surge rating and AEC-Q101 qualification are mandatory. |
| 1.5KE45CA | Same VWM (45 V), through-hole DO-201 package, 1500 W PPPM, no AEC-Q101 or MSL Level 1 rating. | Not qualified for automated SMT production or automotive under-hood use; lacks UL 497B recognition. | Choose SMC3K45CAHM3_A for surface-mount volume manufacturing and safety-certified designs requiring traceable sourcing. |
Compared with SMAJ45CA and 1.5KE45CA, SMC3K45CAHM3_A delivers 7.5× higher peak pulse power, automotive-grade reliability validation, and industry-standard safety certifications - making it the only option qualified for ISO 16750-2 load dump protection in production ECUs.
Availability
SMC3K45CAHM3_A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface hardening, and telecom surge protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMC3K45CAHM3_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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMC3KxxCAHM3_A series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in automotive power systems and industrial control environments demanding AEC-Q101 compliance and UL safety recognition.
FAQ
What is the clamping voltage of SMC3K45CAHM3_A at 41.3 A?
The clamping voltage of SMC3K45CAHM3_A is 72.7 V when subjected to a 10/1000 μs waveform with a peak pulse current of 41.3 A. This value is measured per ANSI/IEEE C62.35 standards and reflects the maximum voltage imposed on protected circuitry during such a transient event. The SMC3K45CAHM3_A maintains this clamping performance across its qualified operating temperature range.
Is SMC3K45CAHM3_A qualified for automotive applications?
Yes, SMC3K45CAHM3_A is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and ADAS modules. It meets ISO 7637-2 (Pulse 1, 2a, 3a, 3b) and ISO 16750-2 (Pulse b) transient immunity requirements, and its SMC package supports MSL Level 1 reflow processing - all confirmed in Vishay Document Number 98241, Revision 09-Jan-2024.
What is the standoff voltage (VWM) and breakdown voltage (VBR) range for SMC3K45CAHM3_A?
The standoff voltage (VWM) of SMC3K45CAHM3_A is 45 V, and its breakdown voltage (VBR) is specified as 50.0 V minimum to 55.3 V maximum at 1 mA test current. These parameters define the device's operational window: it remains non-conductive below 45 V and reliably avalanches within the 50.0–55.3 V band during overvoltage events - critical for protecting 45 V-rated power stages without false triggering.
Does SMC3K45CAHM3_A have UL safety certification?
Yes, SMC3K45CAHM3_A carries UL 497B safety recognition with file number E136766, confirming compliance for use in secondary circuits of end equipment. This certification validates its dielectric strength, flammability rating (UL 94 V-0 molding compound), and construction suitability for industrial and automotive safety-critical applications - distinct from generic TVS diodes lacking agency listing.
What is the peak pulse current rating of SMC3K45CAHM3_A for an 8/20 μs waveform?
The peak pulse current (IPPM) of SMC3K45CAHM3_A for an 8/20 μs waveform is 317 A. This rating corresponds to its 30 kW surge capability and is validated per IEC 61000-4-5 test conditions. The SMC3K45CAHM3_A sustains this current level without parametric shift or failure when mounted per JEDEC 51-2A thermal guidelines on standard FR4 PCBs.
SMC3K45CAHM3_A/I 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:
- 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)
SMC3K45CAHM3_A/I FAQ
1.How can I place an order for SMC3K45CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K45CAHM3_A/I 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_A/I reliable?
The price and inventory of SMC3K45CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K45CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMC3K45CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K45CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K45CAHM3_A/I?
SMC3K45CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K45CAHM3_A/I 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_A/I?
For technical support, including SMC3K45CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K45CAHM3_A/I requirements.
6.How does Aetrix verify that SMC3K45CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMC3K45CAHM3_A/I 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_A/I meets industry standards.
7.What is the process for return or replacement of SMC3K45CAHM3_A/I?
All SMC3K45CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K45CAHM3_A/I, 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_A/I part is unused and in its original packaging.
Return procedure for SMC3K45CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K45CAHM3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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