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Vishay General Semiconductor - Diodes Division SMC3K28CA-M3/9A
- Part No.:
- SMC3K28CA-M3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K28CA-M3/9A.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,353
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Product details
Overview
SMC3K28CA-M3/9A 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), 31.1–34.4 V breakdown voltage, and 45.4 V maximum clamping voltage at 66.1 A surge current. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics against inductive switching transients.
For engineers reviewing the SMC3K28CA-M3/9A datasheet, SMC3K28CA-M3/9A pinout, SMC3K28CA-M3/9A application, or SMC3K28CA-M3/9A equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 28 V stand-off voltage, 150 °C max junction temperature, and halogen-free RoHS-compliant M3 termination.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector with fast response time and low incremental surge resistance, enabling effective suppression of transient overvoltages induced by inductive load switching or lightning surges. Its bidirectional polarity supports AC-coupled or differential signal line protection without polarity concerns.
The device features a silicon avalanche structure optimized for high-energy pulse handling, with thermal derating defined per JESD22-A104 and peak power derated above 25 °C ambient. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive under-hood applications.
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 ISO 7637-2 pulse 5a scenarios |
| Breakdown Voltage VBR | 31.1–34.4 V at 1.0 mA - defines reliable avalanche initiation threshold for precise overvoltage triggering |
| Stand-off Voltage VWM | 28 V - maximum continuous reverse operating voltage before leakage exceeds 2.0 μA |
| Clamping Voltage VC | 45.4 V at 66.1 A - limits downstream voltage stress during worst-case surge events |
| Junction Temperature Range | −55 °C to +150 °C - enables operation in under-hood automotive environments and industrial motor drives |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad area for thermal dissipation |
| Qualification | AEC-Q101 qualified - validated for automotive reliability including HTOL, TCT, and ESD testing |
Pinout & Package
SMC3K28CA-M3/9A uses the standard SMC (DO-214AB) package: molded plastic body with two coplanar matte tin-plated leads, compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Surge current return path | Both terminals are symmetrical; either lead conducts during positive or negative transients - no directional mounting required |
| Anode (Cathode) | Surge current entry point | Identical terminal function to cathode due to bidirectional construction; enables placement across AC or floating nodes |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled interfaces, differential buses, or ungrounded sensor outputs without polarity constraints |
| 3000 W peak pulse rating | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out with low-inductance PCB routing |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring long-term field reliability |
| Halogen-free, RoHS-compliant M3 termination | Meets environmental compliance mandates for global OEMs and industrial equipment without compromising solder joint integrity |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life at ≤30 °C/60% RH - eliminates bake requirements prior to reflow assembly |
Applications
| Automotive Power Distribution | Industrial Motor Drive Control |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O pins in 12 V/24 V vehicle power distribution modules subject to load dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt clamping element placed directly across protected node and ground, responding within <1 ns to limit voltage excursion. Use Value: Clamps to 45.4 V during 66.1 A surge, preventing damage to 3.3 V/5 V logic and 60 V-rated MOSFETs in BCM and junction box designs. |
Use Scenario: Safeguarding encoder feedback lines and analog sensor inputs in variable-frequency drives exposed to back-EMF spikes from inductive motor windings. IC Role / Device Role / Timing Role: Bidirectional transient suppressor installed at connector interface to absorb coupled noise and commutation spikes. Use Value: Maintains signal integrity by limiting transient overshoot to ≤45.4 V while exhibiting only 2.0 μA leakage at 28 V operating bias. |
| Telecom Power Supply Input | Consumer Appliance Mainboard |
|
Use Scenario: Input-stage surge protection for AC-DC adapters and PoE-powered devices subjected to lightning-induced surges on primary-side DC rails. IC Role / Device Role / Timing Role: Primary-line TVS placed after input fuse and before bulk capacitor to divert energy before it reaches downstream converters. Use Value: Withstands 3000 W pulses without degradation, enabling compliance with IEC 61000-4-5 and UL 60950-1 safety standards. |
Use Scenario: Overvoltage protection for microcontroller reset lines and communication buses (I²C, UART) in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Low-leakage (2.0 μA) bidirectional clamp ensuring stable logic levels during ESD events and relay coil flyback. Use Value: Prevents false resets and bus lockup by clamping transients to 45.4 V while adding negligible capacitance (<100 pF) to high-speed signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K28CAHM3/9A | AEC-Q101 qualified version with identical electrical specs; HM3 suffix denotes automotive qualification grade | Required for new automotive designs where AEC-Q101 compliance is mandatory; same footprint and layout | Select SMC3K28CAHM3/9A when automotive qualification documentation and traceability are contractually required |
| SMC3K28CA-M3/57 | Same electrical and mechanical specs; differs only in packaging - 7" tape reel (850 pcs) vs. 13" reel (3500 pcs) | Suitable for prototyping, low-volume production, or space-constrained SMT lines using smaller reels | Choose SMC3K28CA-M3/57 for evaluation, NPI builds, or facilities with limited tape-handling capacity |
Compared with SMC3K28CA-M3/9A, the HM3 variant adds formal AEC-Q101 certification for automotive deployment, while the /57 variant offers smaller reel logistics - neither changes circuit design, layout, or electrical behavior.
Availability
SMC3K28CA-M3/9A is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive control, and telecom power supply input applications requiring stable component supply and long-term manufacturing continuity.
Supply support for SMC3K28CA-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-grade performance.
The SMC3KxxCA series was designed specifically for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where robustness against ISO 7637-2 and IEC 61000-4-5 surges is critical.
FAQ
What is the maximum clamping voltage of the SMC3K28CA-M3/9A at its rated surge current?
The SMC3K28CA-M3/9A has a maximum clamping voltage (VC) of 45.4 V at its peak pulse current (IPPM) of 66.1 A, measured under the standardized 10/1000 μs waveform. This value ensures downstream components see limited overvoltage stress during transient events. The SMC3K28CA-M3/9A maintains this clamping performance across its full operating temperature range of −55 °C to +150 °C.
Is the SMC3K28CA-M3/9A suitable for new automotive designs?
No - the SMC3K28CA-M3/9A is marked "Not for New Designs" in Vishay's official documentation. For new automotive projects, engineers should use the AEC-Q101-qualified SMC3K28CAHM3/9A instead. The SMC3K28CA-M3/9A remains available for legacy production and industrial applications but lacks formal automotive qualification documentation required by most OEMs.
What does the "M3" suffix indicate in SMC3K28CA-M3/9A?
The "M3" suffix in SMC3K28CA-M3/9A denotes halogen-free, RoHS-compliant construction with matte tin-plated leads that meet JESD201 Class 2 whisker resistance and J-STD-002 solderability standards. It also indicates commercial-grade qualification - distinct from the "HM3" suffix used for AEC-Q101-qualified versions. The SMC3K28CA-M3/9A is not automotive-qualified.
Can the SMC3K28CA-M3/9A be used in bidirectional signal line protection?
Yes - the SMC3K28CA-M3/9A is inherently bidirectional and requires no polarity marking or orientation during placement. It provides symmetrical clamping for both positive- and negative-going transients, making it ideal for protecting differential interfaces like RS-485, CAN, or analog sensor pairs. Its 2.0 μA leakage at 28 V ensures minimal impact on signal fidelity in SMC3K28CA-M3/9A-based designs.
What is the thermal derating behavior of the SMC3K28CA-M3/9A above 25 °C ambient?
The SMC3K28CA-M3/9A follows Vishay's standard derating curve: peak pulse power decreases linearly from 100% at 25 °C to approximately 50% at 125 °C junction temperature. Derating is defined per Figure 2 in datasheet 89433 and must be applied based on actual thermal design - including PCB copper area, airflow, and adjacent heat sources - to ensure safe operation of the SMC3K28CA-M3/9A in elevated ambient conditions.
SMC3K28CA-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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 66.1A
- 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)
SMC3K28CA-M3/9A FAQ
1.How can I place an order for SMC3K28CA-M3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K28CA-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 SMC3K28CA-M3/9A reliable?
The price and inventory of SMC3K28CA-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 SMC3K28CA-M3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K28CA-M3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K28CA-M3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K28CA-M3/9A?
SMC3K28CA-M3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K28CA-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 SMC3K28CA-M3/9A?
For technical support, including SMC3K28CA-M3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K28CA-M3/9A requirements.
6.How does Aetrix verify that SMC3K28CA-M3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K28CA-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 SMC3K28CA-M3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K28CA-M3/9A?
All SMC3K28CA-M3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K28CA-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 SMC3K28CA-M3/9A part is unused and in its original packaging.
Return procedure for SMC3K28CA-M3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K28CA-M3/9A Tags
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