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Vishay General Semiconductor - Diodes Division SMCG85A-E3/57T
- Part No.:
- SMCG85A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG85A-E3/57T.pdf
- Description:
- TVS DIODE 85VWM 137VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,440
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Product details
Overview
SMCG85A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for clamping voltage transients on power and signal lines. It features a 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), 10.9 A peak pulse current (IPPM), and clamps to 137 V at rated surge. It is widely used in automotive power supply rail protection.
For engineers reviewing the SMCG85A-E3/57T datasheet, SMCG85A-E3/57T pinout, SMCG85A-E3/57T application, or SMCG85A-E3/57T equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 1500 W surge capability, DO-215AB thermal performance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, activating when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR and low leakage (<1.0 µA at VWM), while the low incremental surge resistance enables effective energy diversion during fast transients (e.g., ISO 7637-2 pulse 1/2a/5a).
The SMCG85A-E3/57T is rated for TJ = −55 °C to +150 °C, supports 200 A non-repetitive forward surge (8.3 ms half-sine), and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its unidirectional configuration requires cathode-band orientation toward the protected line's positive side for correct biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR (min/max) | 94.4 V / 104 V at IT = 1 mA - Confirmed breakdown window ensures reliable turn-on without premature conduction. |
| VC @ IPPM | 137 V - Clamped voltage under 10.9 A 10/1000 µs surge; determines maximum stress on downstream ICs. |
| PPPM | 1500 W - Peak transient power handling capacity; validates robustness against automotive load-dump events. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage preserves system efficiency and minimizes standby power loss. |
| TJ max. | +150 °C - Enables operation in under-hood automotive environments without derating. |
| RθJA | 75 °C/W - Thermal resistance measured on 0.31″ × 0.31″ copper pads; guides PCB thermal layout design. |
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 JESD 22-B102 solderability standards. Meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or lower-potential node. | Defines reference point for unidirectional clamping; must be tied to system GND or return path. |
| Cathode | Current exit terminal in forward bias; marked with band; connected to protected line. | Band identifies polarity; connects to line requiring overvoltage protection (e.g., 12 V battery rail). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| Glass passivated junction | Ensures long-term VBR stability and low parameter drift across temperature and lifetime. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow without moisture-related delamination or popcorn failure. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast transients, improving protection margin for sensitive ICs. |
| 1500 W 10/1000 µs rating | Meets ISO 7637-2 Pulse 5a (load dump) requirements for 12 V systems with external suppression. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump transients (ISO 7637-2 Pulse 5a) and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ground, clamping surges within nanoseconds. Use Value: Limits voltage seen by downstream PMICs and microcontrollers to ≤137 V, preventing latch-up or gate oxide damage. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Parallel-connected TVS on 0–10 V or 4–20 mA signal lines, absorbing ESD and cable discharge events. Use Value: Maintains signal integrity with <1.0 µA leakage at 85 V, avoiding offset errors or false triggering in precision measurement circuits. |
| Telecom DC Power Input Protection | Computer Peripheral USB VBUS Line Protection |
Use Scenario: Securing −48 V telecom rectifier outputs against lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Reverse-biased TVS (cathode to −48 V, anode to ground) clamping negative-going transients. Use Value: Withstands 200 A 8.3 ms surge (IFSM), enabling robust front-end protection without fuse coordination issues. |
Use Scenario: Adding secondary overvoltage protection on USB 2.0/3.0 VBUS lines beyond built-in port controller limits. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 85 V) avoids interference with 5 V nominal operation while suppressing >20 V faults. Use Value: 137 V clamping voltage provides ample margin above USB PD 20 V profiles, ensuring host/device IC survival during adapter faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A-E3/57T | Same VWM (85 V), lower PPPM (400 W), SMA (DO-214AC) package, RθJA = 100 °C/W. | Limited to lower-energy transients; unsuitable for automotive load-dump without derating. | Select if space-constrained layout favors smaller SMA footprint and surge demands are ≤400 W. |
| SMCJ85A-E3/57T | Same VWM (85 V), higher PPPM (1500 W), SMC (DO-214AB) package, RθJA = 50 °C/W, larger body. | Better thermal dissipation but requires more PCB area; not AEC-Q101 qualified. | Choose for industrial power supplies needing higher thermal margin where automotive qualification is not required. |
Compared with SMAJ85A-E3/57T and SMCJ85A-E3/57T, the SMCG85A-E3/57T uniquely combines AEC-Q101 qualification, 1500 W capability, and DO-215AB's optimized thermal-mechanical profile-making it the preferred choice for space-constrained, thermally demanding automotive modules where reliability certification is mandatory.
Availability
SMCG85A-E3/57T is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power input stages requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMCG85A-E3/57T 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, automotive-qualified components.
The SMCG series was developed specifically for high-power, surface-mount transient suppression in harsh environments-targeting AEC-Q101-compliant automotive, industrial, and telecom applications where compact size and thermal robustness are critical.
FAQ
What is the polarity configuration of SMCG85A-E3/57T?
The SMCG85A-E3/57T is a unidirectional TVS diode: its cathode is marked with a band and must be connected to the line being protected, while the anode connects to ground. This configuration allows it to clamp only negative-going transients relative to ground and conduct forward current during overvoltage events. Bidirectional variants use the "CA" suffix (e.g., SMCG85CA); SMCG85A-E3/57T is strictly unidirectional.
Is SMCG85A-E3/57T qualified for automotive applications?
Yes, SMCG85A-E3/57T is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per the AEC-Q101 standard. The "HE3" variant (e.g., SMCG85AHE3/57T) explicitly denotes AEC-Q101 qualification, but the base SMCG85A-E3/57T is also covered under the same qualification per Vishay's documentation and ordering matrix.
What is the maximum clamping voltage of SMCG85A-E3/57T under surge conditions?
The SMCG85A-E3/57T clamps to a maximum of 137 V when subjected to its rated 10.9 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is guaranteed across temperature and represents the highest voltage downstream components will experience during a full-rated transient event-critical for validating IC survivability margins.
Can SMCG85A-E3/57T be used in bidirectional protection circuits?
No, SMCG85A-E3/57T is unidirectional only and cannot provide symmetrical clamping for AC or bipolar transients. For bidirectional protection, Vishay specifies the SMCG85CA variant (with "CA" suffix), which exhibits matched breakdown characteristics in both directions. Using SMCG85A-E3/57T in a bidirectional configuration risks failure during positive transients due to lack of reverse conduction capability.
What PCB pad layout is recommended for optimal thermal performance of SMCG85A-E3/57T?
Vishay specifies a minimum 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pad for each terminal to achieve the published RθJA of 75 °C/W. Reducing pad size increases thermal resistance and reduces surge capability; using internal copper planes or thermal vias beneath pads further improves heat dissipation. The SMCG85A-E3/57T datasheet Figure 2 provides derating curves based on initial junction temperature.
SMCG85A-E3/57T 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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 10.9A
- 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)
SMCG85A-E3/57T FAQ
1.How can I place an order for SMCG85A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG85A-E3/57T 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 SMCG85A-E3/57T reliable?
The price and inventory of SMCG85A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG85A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCG85A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG85A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG85A-E3/57T?
SMCG85A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG85A-E3/57T 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 SMCG85A-E3/57T?
For technical support, including SMCG85A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG85A-E3/57T requirements.
6.How does Aetrix verify that SMCG85A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG85A-E3/57T 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 SMCG85A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCG85A-E3/57T?
All SMCG85A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG85A-E3/57T, 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 SMCG85A-E3/57T part is unused and in its original packaging.
Return procedure for SMCG85A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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