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Vishay General Semiconductor - Diodes Division SMCG28CA-E3/9AT
- Part No.:
- SMCG28CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG28CA-E3/9AT.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,155
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Product details
Overview
SMCG28CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection on signal and power lines. 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), clamping voltage of 45.4 V at 33 A, and AEC-Q101 qualification for automotive reliability.
For engineers reviewing the SMCG28CA-E3/9AT datasheet, SMCG28CA-E3/9AT pinout, SMCG28CA-E3/9AT application, or SMCG28CA-E3/9AT equivalent, this device is selected for high-energy surge suppression in automotive sensor interfaces, industrial I/O ports, and telecom line protection where bidirectional clamping, low clamping ratio, and MSL Level 1 solderability are required.
Technical Context
The SMCG28CA-E3/9AT operates as a symmetrical avalanche diode with identical electrical characteristics in both directions, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability under repetitive surge stress.
Designed for 10/1000 µs waveform compliance, it delivers 33 A peak pulse current (IPPM) while maintaining a clamping voltage of 45.4 V - yielding a clamping ratio (VC/VWM) of 1.62 - and exhibits 75 °C/W junction-to-ambient thermal resistance on standard 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 31.1 V / 34.4 V at 1 mA - tight breakdown window ensures predictable turn-on and compatibility with 3.3 V/5 V/24 V system margins. |
| VC @ IPPM | 45.4 V at 33 A - clamping voltage during 10/1000 µs surge; limits downstream voltage stress to <1.62× VWM. |
| PPPM | 1500 W - peak surge power handling capability; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) compliance with margin. |
| ID @ VWM | 1.0 µA - ultra-low leakage at rated stand-off voltage; avoids signal distortion or bias shift in high-impedance sensor lines. |
| TJ max | +150 °C - extended junction temperature rating enables use in under-hood automotive and industrial environments. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards. |
Pinout & Package
Package: SMCG (DO-215AB) - surface-mount, low-profile gull-wing leaded package with matte tin-plated terminals, compliant with J-STD-002 and JESD22-B102 solderability requirements. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current from either direction; symmetric conduction path enables AC-line or differential-signal protection. |
| Cathode | Transient current exit (bidirectional) | Completes low-impedance path to ground or return rail; no cathode band marking distinguishes bidirectional construction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both polarities - eliminates need for polarity-aware layout in differential or AC-coupled interfaces. |
| Low clamping ratio (VC/VWM) | 1.62 - minimizes overvoltage exposure to downstream ICs such as CAN transceivers or ADC front-ends during surge events. |
| MSL Level 1 rating | Peak reflow temperature up to 260 °C - supports single-pass lead-free assembly without preconditioning or special handling. |
| Glass-passivated junction | Enhanced stability of VBR and leakage over temperature and lifetime - critical for automotive and industrial field-reliability requirements. |
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensor modules per stress test protocols. |
Applications
| Automotive Sensor Protection | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN/CAN bus nodes and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal pair or between signal and chassis ground to clamp ±100 V surges within nanoseconds. Use Value: Prevents latch-up or gate oxide damage in microcontrollers and transceivers by limiting transient voltage to ≤45.4 V while sustaining 1500 W surge energy. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring faults, lightning-induced surges, and relay contact bounce in factory automation systems. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input lines to shunt >1 kA surge currents away from optocoupler inputs and protection FETs. Use Value: Enables reliable operation at ambient temperatures up to +105 °C with <1 µA leakage, preserving signal integrity and reducing false-trigger risk. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Transient suppression on Ethernet PHY magnetics center-taps or RS-485 bus lines exposed to ESD and fast-rising EFT pulses. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp (typ. <100 pF) placed at connector interface to absorb 8 kV contact ESD per IEC 61000-4-2 without signal degradation. Use Value: Maintains signal rise time integrity due to sub-100 pF junction capacitance at 0 V bias, unlike higher-capacitance polymer-based protectors. |
Use Scenario: Secondary-side overvoltage protection on 5 V/9 V/12 V USB-C PD adapter outputs against output short-circuit recovery spikes and capacitor discharge transients. IC Role / Device Role / Timing Role: Fast-response TVS placed between VOUT and GND to clamp overshoots exceeding 28 V during dynamic load steps or fault clearing. Use Value: Limits output voltage excursion to 45.4 V during 10/1000 µs surges, protecting connected devices' USB power controllers and PMICs. |
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 - 30% smaller footprint but higher RθJA (110 °C/W). | Limited to lower-energy surges (IEC 61000-4-5 Level 2); unsuitable for under-hood automotive or high-power industrial I/O. | Select SMAJ28CA only when board space is constrained and surge threat level is ≤400 W. |
| SMBJ28CA | Same VWM (28 V), PPPM = 600 W, SMB (DO-214AA) package - intermediate power rating and thermal performance (RθJA = 85 °C/W). | Supports Level 3 surge immunity but lacks AEC-Q101 qualification; requires additional qualification for automotive use. | Choose SMBJ28CA for cost-sensitive industrial designs where AEC-Q101 is not mandated and 600 W surge capacity suffices. |
Compared with SMAJ28CA and SMBJ28CA, the SMCG28CA-E3/9AT provides 2.5× and 1.5× higher peak pulse power respectively, superior thermal dissipation via DO-215AB's larger copper pad area, and certified automotive reliability - making it the preferred choice for demanding AEC-Q101-compliant systems.
Availability
SMCG28CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter secondary-side protection requiring stable component supply and full traceability.
Supply support for SMCG28CA-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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on high-reliability, high-efficiency, and automotive-qualified solutions.
The SMCG series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure applications demanding AEC-Q101 validation and robust surge immunity.
FAQ
What does the "CA" suffix indicate in SMCG28CA-E3/9AT?
The "CA" suffix denotes a bidirectional configuration: the SMCG28CA-E3/9AT provides symmetrical clamping in both forward and reverse directions, with identical breakdown and clamping characteristics. This enables protection of AC signals, differential buses, or floating nodes without polarity constraints - unlike unidirectional variants (e.g., SMCG28A) that require correct cathode orientation.
Is SMCG28CA-E3/9AT suitable for automotive applications?
Yes, the SMCG28CA-E3/9AT is AEC-Q101 qualified and explicitly rated for automotive use. It undergoes stress testing including temperature cycling, high-temperature reverse bias, and ESD per JESD22 standards. Its +150 °C maximum junction temperature and MSL Level 1 reflow compatibility make it appropriate for engine control units, body electronics, and ADAS sensor modules.
What is the clamping voltage of SMCG28CA-E3/9AT and why does it matter?
The SMCG28CA-E3/9AT has a maximum clamping voltage (VC) of 45.4 V at 33 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value determines the highest voltage imposed on protected circuitry during a surge; a lower VC relative to VWM (28 V) - here 1.62× - ensures sensitive downstream components like microcontrollers or transceivers remain within safe operating limits.
How does the SMCG (DO-215AB) package compare to SMA or SMB packages?
The SMCG (DO-215AB) package offers larger copper pad area (0.31″ × 0.31″) than SMA (DO-214AC) or SMB (DO-214AA), resulting in lower thermal resistance (RθJA = 75 °C/W vs. 110 °C/W and 85 °C/W). This enables higher sustained power dissipation and improved surge survivability - critical for 1500 W PPPM handling in the SMCG28CA-E3/9AT.
Does SMCG28CA-E3/9AT have polarity markings on the device body?
No, the SMCG28CA-E3/9AT has no polarity markings - consistent with its bidirectional design. Unlike unidirectional TVS diodes (e.g., SMCG28A), which feature a cathode band, the CA variant uses symmetrical internal structure and is marked only with its device code (e.g., BFG per datasheet table). PCB layout must treat both terminals as functionally identical.
SMCG28CA-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:
- -
- 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-E3/9AT FAQ
1.How can I place an order for SMCG28CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG28CA-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 SMCG28CA-E3/9AT reliable?
The price and inventory of SMCG28CA-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 SMCG28CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG28CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG28CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG28CA-E3/9AT?
SMCG28CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG28CA-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 SMCG28CA-E3/9AT?
For technical support, including SMCG28CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG28CA-E3/9AT requirements.
6.How does Aetrix verify that SMCG28CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG28CA-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 SMCG28CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG28CA-E3/9AT?
All SMCG28CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG28CA-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 SMCG28CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG28CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG28CA-E3/9AT Tags
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