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Vishay General Semiconductor - Diodes Division SMC3K43CA-M3/57
- Part No.:
- SMC3K43CA-M3/57
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K43CA-M3/57.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,039
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Product details
Overview
SMC3K43CA-M3/57 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR), and 69.4 V maximum clamping voltage (VC) at 43.2 A peak surge current. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMC3K43CA-M3/57 datasheet, SMC3K43CA-M3/57 pinout, SMC3K43CA-M3/57 application, or SMC3K43CA-M3/57 equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, halogen-free RoHS-compliant M3 termination, and compatibility with wave-soldering restrictions on PCB bottom side.
Technical Context
This TVS diode operates as a voltage-clamping protection device triggered by transient overvoltage events such as inductive load switching or ESD. Its low incremental surge resistance and fast response time ensure effective suppression of sub-microsecond transients while maintaining stable clamping performance across -55 °C to +150 °C operating range.
The device uses an avalanche breakdown mechanism with tightly controlled VBR tolerance (±5 % typical), exhibits <2.0 μA reverse leakage at VWM, and meets J-STD-020 MSL Level 1 moisture sensitivity with 260 °C lead-free reflow peak temperature capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse working voltage before clamping activation |
| VBR min/max | 47.8 V / 52.8 V - Breakdown voltage range at 1 mA test current; defines turn-on threshold consistency |
| VC @ IPPM | 69.4 V - Clamped voltage at 43.2 A surge current; determines protected circuit's maximum transient exposure |
| PPPM | 3000 W - Peak pulse power handling per 10/1000 μs waveform; supports high-energy transient immunity |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial environments |
| Polarity | Bidirectional - Symmetrical clamping for AC or dual-polarity DC signal line protection |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad area for thermal dissipation |
Pinout & Package
SMC3K43CA-M3/57 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 requirements. Polarity is unmarked for bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Transient conduction path | Both terminals function identically in bidirectional mode; no functional distinction between pins |
| Anode (Cathode) | Transient conduction path | Identical electrical role to opposite terminal; symmetric clamping behavior ensures AC-compatible protection |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing |
| UL 497B recognized | Safety certification with file E136766 confirms compliance for use in primary/secondary circuit protection |
| MSL Level 1 | Unlimited floor life at ≤30 °C/85 % RH; no bake requirement prior to reflow assembly |
| Halogen-free & RoHS | M3 suffix denotes compliance with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU |
| Low clamping ratio | VC/VWM = 1.61 - Enables tighter margin between clamping voltage and system operating voltage |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 12 V/24 V power rails against load dump and alternator transients in body control modules. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed upstream of DC-DC converters and microcontrollers. Use Value: Withstands 3000 W surges and maintains clamping below 70 V, preventing latch-up or damage to downstream 5 V/3.3 V logic. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional shunt protector located at connector interface before signal conditioning circuitry. Use Value: Sub-100 ns response time and <2.0 μA leakage at 43 V ensure minimal signal distortion and zero impact on precision measurement accuracy. |
| Consumer Appliance Motor Drives | Telecom Power Interface |
Use Scenario: Guarding H-bridge gate drivers and freewheeling diodes in washing machine or HVAC blower motor controllers. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing inductive kickback energy during MOSFET switching transitions. Use Value: 43.2 A peak surge current rating and 150 °C junction rating support repeated high-current transients without thermal runaway. |
Use Scenario: Safeguarding PoE (Power over Ethernet) midspan injectors and PSE controllers from lightning-induced surges on data pairs. IC Role / Device Role / Timing Role: Primary-level transient suppressor on Ethernet PHY power and data lines per IEEE 802.3af/at standards. Use Value: UL 497B recognition and bidirectional symmetry allow integration into both power and differential signal paths without polarity concerns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K43CAHM3/57 | AEC-Q101 qualified version with identical electrical specs; HM3 suffix indicates automotive qualification grade | Required for new automotive designs where AEC-Q101 compliance is mandatory; same footprint and soldering profile | Select when automotive qualification is required; otherwise SMC3K43CA-M3/57 suffices for commercial/industrial use |
| SMC3K40CA-M3/57 | Lower VWM (40 V) and VBR (44.4–49.1 V); clamps at 64.5 V with 46.5 A IPPM | Better suited for 36 V nominal systems; tighter clamping margin but reduced surge headroom vs. SMC3K43CA-M3/57 | Choose for 36 V rail protection where lower clamping voltage outweighs 300 W peak power reduction |
Compared with SMC3K43CAHM3/57, the SMC3K43CA-M3/57 offers identical protection performance without automotive qualification overhead-ideal for cost-sensitive industrial designs. Against SMC3K40CA-M3/57, it provides higher stand-off and clamping margins critical for 42 V automotive subsystems and 48 V industrial buses.
Availability
SMC3K43CA-M3/57 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, consumer appliance motor drives, and telecom power interface applications requiring stable component supply and long-term sourcing continuity.
Supply support for SMC3K43CA-M3/57 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 series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power transient suppression in harsh environments-including under-hood automotive, factory automation, and outdoor telecom infrastructure.
FAQ
What is the maximum clamping voltage of the SMC3K43CA-M3/57 under full-rated surge current?
The SMC3K43CA-M3/57 has a maximum clamping voltage (VC) of 69.4 V when subjected to its rated peak pulse current of 43.2 A (10/1000 μs waveform). This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components experience no more than 69.4 V during worst-case transient events. The SMC3K43CA-M3/57 maintains this clamping performance across its full operating temperature range.
Is the SMC3K43CA-M3/57 suitable for automotive applications?
The SMC3K43CA-M3/57 is not AEC-Q101 qualified, though it shares identical electrical characteristics with the AEC-Q101-certified SMC3K43CAHM3/57 variant. It is rated for operation from -55 °C to +150 °C and meets MSL Level 1, making it usable in non-safety-critical automotive subsystems where qualification is not mandated. For new automotive designs, SMC3K43CAHM3/57 is the recommended replacement for SMC3K43CA-M3/57.
Does the SMC3K43CA-M3/57 have polarity marking on the package?
No, the SMC3K43CA-M3/57 does not feature polarity marking because it is a bidirectional TVS diode. Both terminals are functionally identical, enabling symmetrical clamping for AC signals or dual-rail DC protection without orientation constraints during placement. This eliminates risk of incorrect orientation during automated assembly and simplifies layout for differential or floating signal lines.
What is the surge current rating of the SMC3K43CA-M3/57 at elevated ambient temperatures?
The SMC3K43CA-M3/57's peak pulse current (IPPM) of 43.2 A is specified at TA = 25 °C and must be derated linearly above that temperature per Figure 2 in Vishay document 89433. At 85 °C ambient, IPPM reduces to approximately 31.5 A; at 125 °C, it falls to ~22.5 A. Derating ensures safe operation within the 150 °C maximum junction temperature limit and preserves long-term reliability under sustained thermal stress.
Can the SMC3K43CA-M3/57 be used in bottom-side wave soldering processes?
No, the SMC3K43CA-M3/57 is explicitly not recommended for PCB bottom-side wave mounting per Vishay's datasheet. Its SMC (DO-214AB) package construction and thermal mass distribution may cause insufficient wetting or tombstoning when exposed to wave solder profiles from the board underside. Reflow soldering or top-side selective wave is preferred to ensure reliable interconnect integrity and avoid mechanical stress on the molded case.
SMC3K43CA-M3/57 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 43.2A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMC3K43CA-M3/57 FAQ
1.How can I place an order for SMC3K43CA-M3/57 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K43CA-M3/57 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 SMC3K43CA-M3/57 reliable?
The price and inventory of SMC3K43CA-M3/57 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K43CA-M3/57 is usually 5 days.
3.What payment methods are accepted for SMC3K43CA-M3/57?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K43CA-M3/57 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K43CA-M3/57?
SMC3K43CA-M3/57 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K43CA-M3/57 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 SMC3K43CA-M3/57?
For technical support, including SMC3K43CA-M3/57 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K43CA-M3/57 requirements.
6.How does Aetrix verify that SMC3K43CA-M3/57 is sourced from the original manufacturer or authorized distributors?
All SMC3K43CA-M3/57 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 SMC3K43CA-M3/57 meets industry standards.
7.What is the process for return or replacement of SMC3K43CA-M3/57?
All SMC3K43CA-M3/57 units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K43CA-M3/57, 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 SMC3K43CA-M3/57 part is unused and in its original packaging.
Return procedure for SMC3K43CA-M3/57:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K43CA-M3/57 Tags
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