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Vishay General Semiconductor - Diodes Division SMCG28A-M3/9AT
- Part No.:
- SMCG28A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG28A-M3/9AT.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,575
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Product details
Overview
SMCG28A-M3/9AT from Vishay General Semiconductor is a unidirectional 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), 33.0 A peak pulse current (IPPM), and clamps to 45.4 V at IPPM - ideal for protecting MOSFETs, ICs, and sensor signal lines in automotive and industrial power rails.
For engineers reviewing the SMCG28A-M3/9AT datasheet, SMCG28A-M3/9AT pinout, SMCG28A-M3/9AT application, or SMCG28A-M3/9AT equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and real-world use context for ESD/surge protection design validation.
Technical Context
The SMCG28A-M3/9AT operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast response (<1 ns) to transient surges per IEC 61000-4-5 and ISO 7637-2. Its low incremental surge resistance ensures stable clamping under repetitive 10/1000 µs waveform stress.
Designed for surface-mount automated placement, it meets MSL Level 1 (J-STD-020) with 260 °C lead-free reflow peak, and its DO-215AB package provides mechanical robustness with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - guaranteed avalanche initiation window for predictable turn-on |
| VC @ IPPM | 45.4 V - clamping voltage during 33.0 A 10/1000 µs surge, limiting downstream voltage stress |
| PPPM | 1500 W - peak transient power handling capability under standardized surge waveform |
| ID @ VWM | 1.0 µA - ultra-low leakage at rated stand-off, minimizing standby power loss |
| TJ max | +150 °C - extended junction temperature rating enabling operation in under-hood automotive environments |
| RθJA | 75 °C/W - thermal resistance defining derating behavior on standard 8 mm × 8 mm copper pads |
Pinout & Package
Package: SMCG (DO-215AB) - low-profile, surface-mount plastic case with cathode band marking; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to protected circuit ground or low-side return path during transient suppression |
| Cathode | Current exit terminal in forward bias; marked with band | Connected to power rail or signal line requiring overvoltage clamping; defines polarity-sensitive placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS compliant | M3 suffix confirms halogen-free molding compound and lead-free terminations meeting EU RoHS Directive 2011/65/EU |
| Low-profile DO-215AB package | Height ≤ 0.058" (1.47 mm) enables compact PCB layouts in space-constrained modules |
| Fast response time | Sub-nanosecond turn-on ensures clamping before transient energy damages downstream ICs or MOSFETs |
| MSL Level 1 rating | Unlimited floor life and compatibility with standard 260 °C Pb-free reflow profiles without baking |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
Use Scenario: Protecting 24 V CAN bus transceivers and microcontrollers against load-dump and jump-start transients in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VCC rail and chassis ground to clamp positive-going surges above 28 V. Use Value: Limits rail voltage to ≤45.4 V during 33 A surges, preventing latch-up or gate oxide damage in connected ICs. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: TVS mounted across sensor output and reference ground to absorb ESD and switching noise from nearby solenoids. Use Value: 1.0 µA leakage preserves signal integrity in high-impedance 4–20 mA loops; 1500 W PPPM withstands repeated 1 kV EFT bursts. |
| DC-DC Converter Input Stage | Motor Drive Gate Driver Protection |
Use Scenario: Input-side surge suppression for 24 V input buck converters powering infotainment systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed upstream of input filter capacitor to divert surge current away from controller IC and FETs. Use Value: Clamping at 45.4 V prevents overvoltage stress on 36 V-rated input capacitors and controller UVLO thresholds. | Use Scenario: Protection of high-side N-channel MOSFET gate drivers in BLDC motor inverters subjected to inductive kickback. IC Role / Device Role / Timing Role: TVS connected between gate driver output and source to clamp negative-going spikes during fast turn-off. Use Value: Fast avalanche response limits gate-source voltage excursion to safe levels, avoiding unintended turn-on or gate oxide rupture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-M3/57T | Same VWM (28 V), lower PPPM (400 W), SMA (DO-214AC) package, RθJA = 100 °C/W | Lower power handling and higher thermal resistance limit use to <500 W surge environments | Select when board space allows larger SMA footprint and surge energy is below 400 W |
| SMCJ28A-M3/9AT | Same VWM (28 V), higher PPPM (3000 W), SMC (DO-214AB) package, RθJA = 50 °C/W | Higher surge capacity and better thermal performance suit 12 V/24 V battery systems with severe load dump | Select when system-level surge tests require >1500 W immunity and PCB layout accommodates larger SMC outline |
Compared with SMCG28A-M3/9AT, SMAJ28A-M3/57T offers reduced cost and footprint but sacrifices 65% peak power handling and thermal margin; SMCJ28A-M3/9AT doubles PPPM and improves thermal dissipation but requires 30% more board area - choice depends on validated surge profile and layout constraints.
Availability
SMCG28A-M3/9AT is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor interfaces, and DC-DC converter input stages requiring stable component supply with AEC-Q101 qualification and halogen-free compliance.
Supply support for SMCG28A-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, TVS devices, and optoelectronics with emphasis on reliability and automotive-grade qualification.
The SMCG series is part of Vishay's TRANSZORB® TVS platform engineered specifically for high-power, low-clamping overvoltage protection in harsh environments - targeting automotive, industrial, and telecom infrastructure where AEC-Q101 compliance and 150 °C operation are mandatory.
FAQ
What is the clamping voltage of SMCG28A-M3/9AT at its rated peak pulse current?
The SMCG28A-M3/9AT clamps to 45.4 V at its specified peak pulse current (IPPM) of 33.0 A under the standard 10/1000 µs waveform. This value is measured with the device mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per JEDEC standards and defines the maximum voltage imposed on protected circuitry during worst-case surge events. The SMCG28A-M3/9AT maintains this clamping performance across its full operating temperature range.
Is SMCG28A-M3/9AT qualified for automotive applications?
Yes, SMCG28A-M3/9AT is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per the AEC-Q101-004 standard. Its M3 suffix denotes halogen-free, RoHS-compliant construction, and its +150 °C maximum junction temperature supports under-hood deployment. The SMCG28A-M3/9AT is explicitly listed in Vishay's AEC-Q101 qualified product matrix for transient suppression.
What does the "M3" suffix mean in SMCG28A-M3/9AT?
The "M3" suffix in SMCG28A-M3/9AT indicates halogen-free, RoHS-compliant construction with matte tin-plated leads meeting J-STD-002 solderability and JESD 22-B102 whisker resistance Class 2. It distinguishes this variant from "E3" (RoHS-compliant but not halogen-free) and "HM3" (AEC-Q101 qualified + halogen-free). The SMCG28A-M3/9AT carries full AEC-Q101 qualification despite the base M3 designation.
Can SMCG28A-M3/9AT be used in bidirectional configurations?
No, SMCG28A-M3/9AT is a unidirectional TVS diode, as indicated by the "A" suffix (vs. "CA" for bidirectional variants like SMCG28CA). Its cathode band marking defines polarity, and it conducts only in reverse breakdown - it cannot suppress negative transients on AC or symmetrical signal lines. For bidirectional protection, the SMCG28CA-M3/9AT must be selected instead, which has identical VWM but symmetrical clamping in both directions.
What is the thermal resistance of SMCG28A-M3/9AT, and how does it affect layout?
The SMCG28A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes standard JEDEC test conditions; reducing pad size or omitting thermal vias increases RθJA, accelerating thermal derating above 25 °C ambient. Layouts for high-reliability applications should maintain minimum pad dimensions and add ≥4 thermal vias per pad to sustain full 1500 W PPPM capability at elevated temperatures.
SMCG28A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCG28A-M3/9AT FAQ
1.How can I place an order for SMCG28A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG28A-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 SMCG28A-M3/9AT reliable?
The price and inventory of SMCG28A-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 SMCG28A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG28A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG28A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG28A-M3/9AT?
SMCG28A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG28A-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 SMCG28A-M3/9AT?
For technical support, including SMCG28A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG28A-M3/9AT requirements.
6.How does Aetrix verify that SMCG28A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG28A-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 SMCG28A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG28A-M3/9AT?
All SMCG28A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG28A-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 SMCG28A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG28A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG28A-M3/9AT Tags
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