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Vishay General Semiconductor - Diodes Division SMCG28A-E3/9AT
- Part No.:
- SMCG28A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG28A-E3/9AT.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,229
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Product details
Overview
SMCG28A-E3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) surface-mount 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, 45.4 V maximum clamping voltage (VC) at 33.0 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive power line and sensor interface protection.
For engineers reviewing the SMCG28A-E3/9AT datasheet, SMCG28A-E3/9AT pinout, SMCG28A-E3/9AT application, or SMCG28A-E3/9AT equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), RoHS-compliant industrial-grade construction, and real-world use context for ESD/surge hardening in 12 V/24 V systems.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert surge energy away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response (<1 ns), while low incremental surge resistance enables effective clamping under high-current transients like ISO 7637-2 pulse 1/2a/5a.
The SMCG28A-E3/9AT is rated for TJ = –55 °C to +150 °C, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and is qualified to AEC-Q101 - confirming suitability for under-hood automotive environments where thermal cycling and mechanical shock tolerance are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for 24 V nominal systems. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - Confirmed avalanche onset window; ensures reliable triggering without premature conduction. |
| VC @ IPPM | 45.4 V at 33.0 A (10/1000 µs) - Clamped voltage seen by protected circuit during worst-case surge; limits stress on 36 V-rated components. |
| PPPM | 1500 W - Peak transient power handling capability; supports protection against ISO 7637-2 Pulse 5a (500 W typical) with margin. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage at rated stand-off; prevents parasitic loading on high-impedance sensor lines or bias networks. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on 8.0 mm × 8.0 mm copper pads; informs derating above TA = 25 °C per Fig. 2. |
| AEC-Q101 | Qualified - Validated for automotive reliability including temperature cycling, humidity bias, and mechanical shock per AEC standard. |
Pinout & Package
Package: SMCG (DO-215AB) - low-profile, gull-wing surface-mount case with matte tin-plated leads solderable per J-STD-002/JESD 22-B102; meets UL 94 V-0 flammability rating; polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-impedance return plane; completes clamping loop during transient events. |
| Cathode | Protected line connection | Connected to line under protection (e.g., CAN_H, LIN, 24 V rail); conducts avalanche current when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low leakage across temperature and lifetime; eliminates risk of junction degradation from moisture or contamination. |
| AEC-Q101 qualification | Validates reliability for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| MSL Level 1 rating | Enables single-reflow assembly without baking; compatible with standard SMT processes up to 260 °C peak temperature. |
| Low incremental surge resistance | Minimizes VC rise under high di/dt surges - critical for protecting fast-switching MOSFET gates and microcontroller I/O pins. |
| 1500 W PPPM (10/1000 µs) | Provides design margin beyond ISO 7637-2 Pulse 5a (450–500 W) and IEC 61000-4-5 Line-to-Line (500 W) test requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in engine control modules against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Shunt clamping device placed between rail and ground; activates within <1 ns to clamp spikes up to 120 V. Use Value: Limits rail voltage to ≤45.4 V during 33 A surge, preventing damage to MCU power supplies and PMICs rated for 36 V max. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in pressure/temperature sensors exposed to field wiring surges. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; unidirectional SMCG28A-E3/9AT protects signal return path with minimal leakage (<1 µA). Use Value: Maintains signal integrity by avoiding DC offset from leakage while clamping EFT bursts (IEC 61000-4-4) up to ±4 kV. |
| Automotive LIN Bus Protection | DC-DC Converter Input Stage Protection |
Use Scenario: Securing LIN transceiver inputs against battery feed coupling and electrostatic discharge in door module ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS tied between LIN bus and chassis ground; cathode to bus, anode to ground. Use Value: Clamps ESD (IEC 61000-4-2 ±8 kV contact) to <45.4 V within nanoseconds, preserving transceiver functionality without latch-up. |
Use Scenario: Shielding buck converter input capacitors and high-side FETs from 12 V battery line transients in infotainment power supplies. IC Role / Device Role / Timing Role: Primary surge suppression device upstream of input filter; handles repetitive pulses per ISO 7637-2 Pulse 1 (inductive kick). Use Value: Absorbs 1500 W peak energy without degradation, enabling use of smaller input bulk capacitance and reducing board space. |
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-E3/57T | Same VWM (28 V), lower PPPM (400 W), SMA (DO-214AC) package, RθJA = 110 °C/W | Limited to lower-energy transients (e.g., IEC 61000-4-2 only); unsuitable for ISO 7637-2 Pulse 5a | Select when cost or footprint constraints outweigh surge margin needs; verify thermal derating on small pads. |
| SMCJ28A-E3/9AT | Same VWM (28 V), identical PPPM (1500 W), but larger SMC (DO-214AB) package and higher RθJA (85 °C/W) | Requires more PCB area; less suitable for dense automotive modules; same clamping performance | Choose if existing SMC footprint is standardized; otherwise SMCG offers superior thermal efficiency and density. |
Compared with SMAJ28A-E3/57T and SMCJ28A-E3/9AT, the SMCG28A-E3/9AT delivers identical 28 V/1500 W protection in a smaller DO-215AB package with lower thermal resistance (75 vs. 85–110 °C/W), enabling higher sustained surge duty cycles in space-constrained automotive modules.
Availability
SMCG28A-E3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, LIN bus safeguarding, and DC-DC converter input stage protection requiring stable component supply and AEC-Q101 compliance.
Supply support for SMCG28A-E3/9AT 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, precision, and application-specific qualification.
The SMCG series targets automotive and industrial transient suppression, delivering AEC-Q101-qualified, high-power-density TVS diodes optimized for space-constrained, thermally demanding environments.
FAQ
What is the clamping voltage of the SMCG28A-E3/9AT at its rated peak pulse current?
The SMCG28A-E3/9AT has a maximum clamping voltage (VC) of 45.4 V at 33.0 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuits during surge events. The SMCG28A-E3/9AT maintains this clamping performance across its qualified temperature range and after repeated surge exposures per AEC-Q101 stress testing.
Is the SMCG28A-E3/9AT suitable for automotive applications?
Yes, the SMCG28A-E3/9AT is AEC-Q101 qualified and rated for operating junction temperatures from –55 °C to +150 °C, making it suitable for under-hood and cabin automotive applications. Its construction - including glass-passivated junction, MSL Level 1 reflow compatibility, and halogen-free RoHS compliance (E3 suffix) - aligns with automotive manufacturing and reliability requirements. The SMCG28A-E3/9AT is commonly deployed in engine control units, body control modules, and ADAS sensor interfaces.
What does the "E3/9AT" suffix indicate in SMCG28A-E3/9AT?
The "E3" suffix denotes RoHS-compliant, industrial-grade construction with matte tin-plated leads, while "9AT" specifies packaging in 13-inch diameter plastic tape and reel with a base quantity of 3500 units. This format supports high-volume automated assembly. The SMCG28A-E3/9AT is distinct from HE3-suffixed variants, which carry AEC-Q101 qualification - though the SMCG28A-E3/9AT itself is AEC-Q101 qualified per Vishay documentation, confirming its automotive suitability despite the E3 base code.
How does the SMCG28A-E3/9AT compare to bidirectional TVS diodes in the same family?
The SMCG28A-E3/9AT is unidirectional, meaning it protects against reverse-polarity surges only - ideal for DC rails where polarity is fixed. Bidirectional variants (e.g., SMCG28CA) provide symmetrical clamping for AC-coupled or floating lines but exhibit higher leakage at low voltages. For 24 V automotive systems, the SMCG28A-E3/9AT offers lower ID (<1.0 µA) and tighter VBR tolerance than equivalent CA parts, improving noise immunity and predictability in power rail protection.
What is the thermal resistance of the SMCG28A-E3/9AT, and how does it affect layout?
The SMCG28A-E3/9AT 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 minimum recommended pad layout; reducing pad size increases RθJA and requires derating per Figure 2 in the datasheet. To maintain reliability under repetitive surges, designers must allocate sufficient copper area and consider thermal vias - especially in sealed automotive enclosures where ambient temperature may exceed 85 °C. The SMCG28A-E3/9AT's low RθJA relative to SMAJ/SMCJ alternatives directly improves power dissipation headroom.
SMCG28A-E3/9AT 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-E3/9AT FAQ
1.How can I place an order for SMCG28A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG28A-E3/9AT 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-E3/9AT reliable?
The price and inventory of SMCG28A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG28A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG28A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG28A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG28A-E3/9AT?
SMCG28A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG28A-E3/9AT 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-E3/9AT?
For technical support, including SMCG28A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG28A-E3/9AT requirements.
6.How does Aetrix verify that SMCG28A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG28A-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG28A-E3/9AT?
All SMCG28A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG28A-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG28A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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