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Vishay General Semiconductor - Diodes Division SMC3K43CA-M3/9A
- Part No.:
- SMC3K43CA-M3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K43CA-M3/9A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,238
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Product details
Overview
SMC3K43CA-M3/9A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), with a breakdown voltage range of 47.8–52.8 V at 1 mA test current, stand-off voltage of 43 V, and clamping voltage of 69.4 V at 43.2 A peak pulse current. It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning surges in automotive and industrial systems.
For engineers reviewing the SMC3K43CA-M3/9A datasheet, SMC3K43CA-M3/9A pinout, SMC3K43CA-M3/9A application, or SMC3K43CA-M3/9A equivalent, key selection criteria include its bidirectional polarity, 43 V working voltage, 69.4 V clamping performance at 43.2 A, UL 497B safety recognition, and M3 halogen-free RoHS-compliant commercial-grade construction with J-STD-020 MSL Level 1 rating.
Technical Context
The SMC3K43CA-M3/9A operates as a silicon avalanche diode designed for unidirectional clamping in bidirectional configurations, leveraging controlled reverse avalanche breakdown to limit transient overvoltages. Its low incremental surge resistance and fast response time ensure effective suppression of sub-microsecond transients without latch-up or degradation under repetitive stress.
Thermal design is constrained by a maximum junction temperature of 150 °C and derating above 25 °C ambient, with mechanical mounting limited to top-side reflow only-bottom-side wave soldering is explicitly not recommended. The device meets JESD201 Class 2 whisker resistance and UL 497B safety requirements for use in protected circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 3000 W - sustains high-energy transients without failure in automotive load-dump or inductive switch-off events |
| Stand-off Voltage (VWM) | 43 V - maximum continuous reverse operating voltage before conduction begins; sets system operating margin |
| Breakdown Voltage (VBR) | 47.8–52.8 V at 1 mA - defines onset of avalanche clamping; tight tolerance enables predictable protection threshold |
| Clamping Voltage (VC) | 69.4 V at 43.2 A IPPM - limits downstream voltage stress during worst-case surge; critical for IC survival |
| Junction Temperature Range | −55 °C to +150 °C - supports operation in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - industry-standard 8.0 mm × 8.0 mm copper pad footprint with 0.260″ × 0.280″ body |
| Polarity | Bidirectional - protects both positive and negative transients without external circuitry or orientation dependency |
Pinout & Package
SMC3K43CA-M3/9A uses the standard SMC (DO-214AB) surface-mount package with two terminals: Cathode and Anode. No polarity marking is applied on bidirectional variants; orientation is non-critical in PCB layout. The molded case meets UL 94 V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during negative transient | Enables symmetrical clamping for bipolar surges; no external bias required |
| Cathode | Current entry point during positive transient | Completes bidirectional path; terminal assignment matches DO-214AB mechanical polarity convention |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per stress test plan |
| UL 497B recognition (E136766) | Confirms compliance with safety standards for telecom and industrial signal-line protection applications |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and single reflow without baking; simplifies SMT manufacturing flow |
| Halogen-free, RoHS-compliant (M3) | Meets environmental compliance mandates for commercial electronics without compromising surge capability |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving clamping fidelity |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 48 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role: Primary TVS clamp placed across power input rails upstream of DC/DC converters. Use Value: Withstands 3000 W pulses and clamps to 69.4 V, preventing damage to 75 V-rated power management ICs. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in PLC I/O modules from field-wiring ESD and inductive kickback. IC Role / Device Role: Bidirectional shunt protector on differential or single-ended signal traces. Use Value: 43 V stand-off allows full-scale 4–20 mA or 0–10 V operation while clamping ±1 kV ESD per IEC 61000-4-2. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Surge protection on Ethernet PHY or RS-485 bus lines exposed to lightning-induced surges in outdoor base stations. IC Role / Device Role: Secondary-level TVS placed after common-mode chokes to suppress differential-mode transients. Use Value: 69.4 V clamping ensures transceiver ICs (e.g., MAX14841) remain within absolute maximum ratings during 10/1000 μs surges. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in washing machine control boards. IC Role / Device Role: Across-motor terminals to divert inductive energy away from MCU GPIOs and driver FETs. Use Value: 3000 W rating handles repeated 100 ms motor stall surges; bidirectional nature eliminates need for dual-diode placement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K43CAHM3/9A | AEC-Q101 qualified variant with identical electrical specs; HM3 suffix denotes automotive qualification grade | Required for automotive OEM designs needing formal AEC-Q101 documentation and traceability | Select SMC3K43CAHM3/9A when automotive PPAP or long-term reliability validation is mandated |
| SMC3K45CA-M3/9A | Higher stand-off voltage (45 V) and clamping voltage (72.7 V); 2 V higher VWM shifts protection threshold upward | Suitable where system nominal voltage is 36–42 V and tighter margin above 43 V is needed | Choose SMC3K45CA-M3/9A if design requires higher DC operating headroom before clamping initiates |
Compared with SMC3K43CA-M3/9A, SMC3K43CAHM3/9A adds formal automotive qualification without altering electrical behavior, while SMC3K45CA-M3/9A raises the protection threshold by 2 V-offering greater immunity to normal operating overvoltage but slightly reduced clamping margin for fixed-rail ICs.
Availability
SMC3K43CA-M3/9A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom line protection, and consumer appliance motor control requiring stable component supply and consistent M3-grade RoHS compliance.
Supply support for SMC3K43CA-M3/9A 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 high-reliability, high-power, and automotive-qualified components.
The SMC3KxxCA series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for robust, high-energy transient suppression in harsh environments-including under-hood automotive, factory automation, and infrastructure equipment.
FAQ
What is the maximum clamping voltage of the SMC3K43CA-M3/9A at its rated peak pulse current?
The SMC3K43CA-M3/9A has a maximum clamping voltage (VC) of 69.4 V at its rated peak pulse current (IPPM) of 43.2 A, measured using the standardized 10/1000 μs waveform. This value is guaranteed per the Vishay datasheet revision dated 13-Sep-2022 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SMC3K43CA-M3/9A maintains this clamping performance across its specified operating temperature range.
Is the SMC3K43CA-M3/9A suitable for automotive applications?
The SMC3K43CA-M3/9A is not AEC-Q101 qualified; it carries the M3 suffix indicating halogen-free, RoHS-compliant commercial-grade construction. For automotive use, Vishay specifies the HM3-suffix variant (e.g., SMC3K43CAHM3/9A) as the AEC-Q101-qualified alternative. The SMC3K43CA-M3/9A may be used in non-safety-critical automotive subsystems where formal qualification is not mandated, but designers must validate reliability independently. The SMC3K43CA-M3/9A remains fully compatible in footprint and electrical behavior with its HM3 counterpart.
What does the "-M3/9A" suffix indicate in SMC3K43CA-M3/9A?
The "-M3/9A" suffix in SMC3K43CA-M3/9A denotes two attributes: "M3" specifies halogen-free, RoHS-compliant, commercial-grade construction meeting JESD201 Class 2 whisker resistance, while "/9A" indicates packaging in a 13-inch diameter plastic tape and reel containing 3500 units. This differs from the "/57" option (7-inch reel, 850 units). The SMC3K43CA-M3/9A shares identical electrical and thermal specifications with other M3-packaged variants in the SMC3KxxCA family.
Can the SMC3K43CA-M3/9A be used in bidirectional signal line protection?
Yes-the SMC3K43CA-M3/9A is explicitly designed for bidirectional polarity and requires no external circuitry to protect AC-coupled or differential signal lines from both positive and negative transients. Its symmetrical avalanche characteristics ensure matched clamping in either direction, making it suitable for RS-485, CAN, or sensor analog outputs. Polarity is unmarked on the device, confirming its bidirectional implementation. The SMC3K43CA-M3/9A delivers consistent 69.4 V clamping regardless of surge polarity.
What is the thermal derating behavior of the SMC3K43CA-M3/9A above 25 °C ambient?
The SMC3K43CA-M3/9A follows standard TVS derating: peak pulse power decreases linearly above 25 °C ambient, reaching ~50% of rated 3000 W at 125 °C junction temperature, per Figure 2 in the Vishay datasheet (Doc. #89433). Derating is based on initial junction temperature, not case or ambient alone. Layout practices-such as using 8.0 mm × 8.0 mm copper pads-must be followed to maintain thermal performance. The SMC3K43CA-M3/9A maximum junction temperature remains 150 °C regardless of ambient conditions.
SMC3K43CA-M3/9A 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):
- 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-M3/9A FAQ
1.How can I place an order for SMC3K43CA-M3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K43CA-M3/9A 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 SMC3K43CA-M3/9A reliable?
The price and inventory of SMC3K43CA-M3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K43CA-M3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K43CA-M3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K43CA-M3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K43CA-M3/9A?
SMC3K43CA-M3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K43CA-M3/9A 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 SMC3K43CA-M3/9A?
For technical support, including SMC3K43CA-M3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K43CA-M3/9A requirements.
6.How does Aetrix verify that SMC3K43CA-M3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K43CA-M3/9A 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 SMC3K43CA-M3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K43CA-M3/9A?
All SMC3K43CA-M3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K43CA-M3/9A, 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 SMC3K43CA-M3/9A part is unused and in its original packaging.
Return procedure for SMC3K43CA-M3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K43CA-M3/9A Tags
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