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Vishay General Semiconductor - Diodes Division SMCG28CA-M3/9AT
- Part No.:
- SMCG28CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG28CA-M3/9AT.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,558
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Product details
Overview
SMCG28CA-M3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (PPPM), and clamps to ≤45.4 V at 33.0 A peak pulse current (IPPM) under 10/1000 µs waveform - deployed in automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMCG28CA-M3/9AT datasheet, SMCG28CA-M3/9AT pinout, SMCG28CA-M3/9AT application, or SMCG28CA-M3/9AT equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, halogen-free RoHS compliance, DO-215AB mechanical data, and real-world protection use cases - all confirmed from Vishay's official 88457 document (Rev. 09-Jan-2024).
Technical Context
This bidirectional TVS operates symmetrically in both polarities with identical VBR min/max (31.1 V / 34.4 V), ID ≤1.0 µA at VWM = 28 V, and clamping voltage VC = 45.4 V at IPPM = 33.0 A. Its glass-passivated junction ensures stable leakage and fast response (<1 ns), while MSL Level 1 rating supports lead-free reflow up to 260 °C peak.
The device is rated for TJ = –55 °C to +150 °C operation, exhibits RθJA = 75 °C/W and RθJL = 15 °C/W thermal resistance, and sustains 200 A non-repetitive forward surge (IFSM) - applicable only to unidirectional variants; SMCG28CA-M3/9AT is bidirectional and thus excludes IFSM usage per datasheet note (2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse stand-off voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - guaranteed breakdown range ensuring reliable triggering across temperature and unit variation. |
| VC @ IPPM | 45.4 V at 33.0 A (10/1000 µs) - clamping voltage limiting downstream voltage stress during surge events. |
| PPPM | 1500 W - peak pulse power handling capacity defining survivability against standardized lightning/surge transients. |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage preserving signal integrity and minimizing standby power loss in high-impedance circuits. |
| Package | SMCG (DO-215AB) - surface-mount gull-wing package with 8.0 mm × 8.0 mm copper pad requirement for thermal derating compliance. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards. |
Pinout & Package
SMCG28CA-M3/9AT uses the SMCG (DO-215AB) package: a compact, low-profile, gull-wing surface-mount outline with two terminals and no polarity marking (bidirectional configuration). Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per datasheet Fig. 2 and thermal notes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Conducts during positive voltage excursions above VBR; symmetrical with cathode due to bidirectional structure. |
| Cathode | Transient current entry (negative half-cycle) | Conducts during negative voltage excursions above VBR; functionally identical to anode in CA-suffix devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns - e.g., CAN bus, RS-485, sensor bridges. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules where field reliability and lifetime stress tolerance are mandatory. |
| Halogen-free & RoHS compliant (M3 suffix) | Meets global environmental regulations and JEDEC JESD201 Class 2 whisker resistance, supporting lead-free assembly and long-term solder joint integrity. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients by reducing dynamic impedance - critical for protecting sub-5 V logic and analog front-ends. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profiles up to 260 °C peak, eliminating bake requirements and streamlining SMT production. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive switching spikes in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector or IC pin to shunt surge energy before it reaches protected circuitry. Use Value: Limits transient voltage to ≤45.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V microcontrollers and signal conditioners. |
Use Scenario: Safeguarding PLC digital input modules and fieldbus nodes (e.g., Profibus, Modbus RTU) against ESD and surge coupling from long cable runs. IC Role / Device Role / Timing Role: Primary board-level TVS on signal line entry points, coordinated with series impedance and filtering for IEC 61000-4-2/4-4/4-5 compliance. Use Value: Absorbs 1500 W surges without degradation, maintaining signal fidelity and enabling >100,000 surge cycles per IEC 61000-4-5 Annex A. |
| Telecom Line Interface | Consumer Power Adapter Feedback Loop |
Use Scenario: Shielding Ethernet PHY magnetics secondary side and PoE-powered device DC bias lines from induced lightning surges and hot-swap transients. IC Role / Device Role / Timing Role: Secondary-side TVS between isolated DC output and ground, referenced to local secondary ground plane. Use Value: Clamps within <1 ns to protect 28 V-rated optocouplers and feedback resistors while sustaining 33 A peak current per IEEE C62.41 test waveforms. |
Use Scenario: Securing the voltage divider network feeding TL431 or optocoupler feedback pins in AC/DC adapters against mains-borne transients. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) clamp across feedback resistor string to prevent false regulation or shutdown during line surges. Use Value: Maintains <1 µA leakage at 28 V, avoiding regulation drift while clamping to 45.4 V - preserving ±1% output accuracy during transient events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CA | Same VWM (28 V), lower PPPM (400 W), SMA (DO-214AC) package - smaller footprint but higher thermal resistance (RθJA = 110 °C/W). | Preferred for space-constrained consumer PCBs where 400 W surge immunity suffices; not suitable for automotive under-hood environments. | Select SMAJ28CA when board area is critical and surge duty cycle is infrequent; verify thermal margin with reduced copper pad area. |
| SMBJ28CA | Same VWM (28 V), PPPM = 600 W, SMB (DO-214AA) package - intermediate power rating and thermal performance (RθJA = 85 °C/W). | Used in industrial motor drives and power supplies requiring moderate surge robustness with tighter layout than SMCG allows. | Choose SMBJ28CA for cost-sensitive industrial designs needing better-than-SMAJ but less than SMCG power handling and thermal capability. |
Compared with SMAJ28CA and SMBJ28CA, SMCG28CA-M3/9AT delivers 2.5× and 1.5× higher peak pulse power respectively, lower clamping voltage under full surge, and AEC-Q101 qualification - making it the only option qualified for automotive under-hood deployment and high-reliability industrial control systems.
Availability
SMCG28CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line interface surge suppression requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMCG28CA-M3/9AT 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 SMCG series targets high-power transient suppression in harsh environments - engineered for automotive, industrial, and telecom applications demanding AEC-Q101 qualification, low clamping, and robust thermal performance in surface-mount form.
FAQ
What is the clamping voltage of SMCG28CA-M3/9AT at its rated peak pulse current?
The SMCG28CA-M3/9AT clamps to a maximum of 45.4 V when subjected to its specified peak pulse current of 33.0 A under the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's Document Number 88457, ensuring predictable voltage limiting during surge events. The clamping behavior is symmetrical for both polarities due to its bidirectional design.
Is SMCG28CA-M3/9AT suitable for automotive applications?
Yes, SMCG28CA-M3/9AT is AEC-Q101 qualified per Vishay's documentation, confirming its reliability for automotive use including engine control units, body electronics, and ADAS sensor interfaces. The M3 suffix denotes halogen-free, RoHS-compliant construction, and the DO-215AB package meets MSL Level 1 for lead-free reflow - all essential for Tier 1 automotive supply chain compliance.
Does SMCG28CA-M3/9AT have polarity markings on the package?
No, SMCG28CA-M3/9AT has no polarity markings because it is a bidirectional TVS diode (indicated by the "CA" suffix). Unlike unidirectional variants that feature a cathode band, bidirectional types such as SMCG28CA-M3/9AT are symmetrical and function identically regardless of orientation - simplifying placement and eliminating risk of reverse installation.
What is the maximum operating junction temperature for SMCG28CA-M3/9AT?
The maximum operating junction temperature (TJ max.) for SMCG28CA-M3/9AT is +150 °C, as specified in the Absolute Maximum Ratings table of Vishay's 88457 datasheet. This rating enables reliable operation in under-hood automotive environments and industrial enclosures where ambient temperatures exceed 105 °C, provided thermal design adheres to the recommended 8.0 mm × 8.0 mm copper pad layout.
How does the M3 suffix affect the environmental compliance of SMCG28CA-M3/9AT?
The M3 suffix on SMCG28CA-M3/9AT indicates halogen-free, RoHS-compliant construction meeting JEDEC JESD201 Class 2 whisker resistance requirements. It confirms absence of brominated flame retardants and chlorine-based compounds, supporting environmentally regulated markets and ensuring long-term solder joint reliability in high-vibration or thermally cycled applications.
SMCG28CA-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AB, SMC Gull Wing
- 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):
- 33A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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 (SMCG)
SMCG28CA-M3/9AT FAQ
1.How can I place an order for SMCG28CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG28CA-M3/9AT 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 SMCG28CA-M3/9AT reliable?
The price and inventory of SMCG28CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG28CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG28CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG28CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG28CA-M3/9AT?
SMCG28CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG28CA-M3/9AT 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 SMCG28CA-M3/9AT?
For technical support, including SMCG28CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG28CA-M3/9AT requirements.
6.How does Aetrix verify that SMCG28CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG28CA-M3/9AT 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 SMCG28CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG28CA-M3/9AT?
All SMCG28CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG28CA-M3/9AT, 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 SMCG28CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG28CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG28CA-M3/9AT Tags
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