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Vishay General Semiconductor - Diodes Division SMCG45A-E3/57T
- Part No.:
- SMCG45A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG45A-E3/57T.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,299
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Product details
Overview
SMCG45A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor (TVS) in the SMCG (DO-215AB) package, designed for clamping fast voltage transients on power and signal lines. It features a 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), 20.6 A peak pulse current (IPPM), and clamps to 72.7 V at rated surge - used in automotive power rail protection and industrial sensor interface circuits.
For engineers reviewing the SMCG45A-E3/57T datasheet, SMCG45A-E3/57T pinout, SMCG45A-E3/57T application, or SMCG45A-E3/57T equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, 75 °C/W junction-to-ambient thermal resistance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCG45A-E3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering sub-nanosecond response to ESD and lightning-induced surges. Its unidirectional configuration enables forward conduction only during reverse overvoltage events, with clamping action defined by its 72.7 V VC at 20.6 A IPPM under 10/1000 µs waveform.
Thermally, it sustains 150 °C maximum junction temperature and dissipates 6.5 W at TA = 50 °C on infinite heatsink. Its DO-215AB package supports reflow soldering per J-STD-020 (peak 260 °C), and meets UL 94 V-0 flammability rating with matte tin-plated leads compliant to JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for 48 V nominal systems. |
| VBR min/max | 50.0 V / 55.3 V at IT = 1 mA - Confirmed breakdown threshold ensures predictable turn-on across production lots. |
| VC @ IPPM | 72.7 V at 20.6 A - Clamping voltage under full-rated 1500 W surge; determines protected circuit's maximum transient exposure. |
| PPPM | 1500 W (10/1000 µs) - Peak surge energy handling capacity; validates suitability for ISO 7637-2 Pulse 5a/b and IEC 61000-4-5 Level 4. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and high-temperature industrial enclosures. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient on standard 8 mm × 8 mm pad layout; guides PCB copper area design. |
| AEC-Q101 | Qualified - Certified for automotive-grade reliability including HTOL, TC, and ESD testing per AEC specification. |
Pinout & Package
Package: SMCG (DO-215AB) - low-profile, surface-mount gull-wing package with cathode band marking; 0.220–0.245 inch body length, 0.115–0.125 inch width, 0.024–0.040 inch height; UL 94 V-0 molding compound; matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current terminal (cathode-banded end) | Connected to system ground or lower-potential rail; defines direction of clamping conduction path. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line (e.g., 48 V supply); initiates avalanche breakdown when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS power supplies. |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift. |
| MSL Level 1 rating | Allows unlimited floor life and single reflow without baking; simplifies SMT manufacturing flow. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for downstream ICs. |
| 1500 W peak pulse power | Supports robust protection against load dump and inductive switching events in 24–48 V systems. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump transients per ISO 7637-2 Pulse 5a (up to 60 V, 400 ms). IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48 V rail and chassis ground to clamp surges above 55 V. Use Value: Limits peak voltage to 72.7 V during 20.6 A surge, preventing damage to PMICs and microcontrollers rated for ≤ 80 V absolute max. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC inputs against ESD and cable discharge. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt transients before reaching op-amp front-end. Use Value: Sub-ns response and 72.7 V clamping preserve signal integrity while protecting 3.3 V/5 V ADC inputs from >1 kV HBM events. |
| Telecom DC Power Input | Computer Peripheral Port Protection |
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges on central office distribution lines. IC Role / Device Role / Timing Role: Unidirectional TVS oriented to clamp positive transients on return path relative to system ground. Use Value: 1500 W rating handles IEC 61000-4-5 Combination Wave (1.2/50 µs + 8/20 µs) up to Level 4 (4 kV/2 kA). |
Use Scenario: Hardening USB-C or PCIe auxiliary power pins (VCONN/VBUS) against hot-plug induced transients. IC Role / Device Role / Timing Role: TVS placed inline on 5 V or 3.3 V auxiliary rails to absorb coupling noise from adjacent high-speed lanes. Use Value: 45 V VWM allows safe operation across full USB PD voltage range while clamping spikes before they reach controller ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/57T | Same VWM (45 V) and VC (72.7 V), but lower PPPM (400 W) and smaller SMA (DO-214AC) package. | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5 or IEC 61000-4-5 Level 4. | Select when board space is constrained and surge requirements are ≤ 400 W. |
| SMCJ45A-E3/57T | Identical VWM, VBR, and VC, but rated for 3000 W PPPM and housed in larger SMC (DO-214AB) package. | Overqualified for 1500 W needs; requires larger PCB footprint and higher assembly cost. | Choose only if future design margin or legacy platform compatibility demands 3 kW capability. |
Compared with SMAJ45A-E3/57T, SMCG45A-E3/57T delivers 3.75× higher surge power handling in a compact DO-215AB outline; versus SMCJ45A-E3/57T, it achieves identical clamping performance at half the footprint and cost, making it optimal for space-constrained AEC-Q101-compliant designs.
Availability
SMCG45A-E3/57T is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, telecom DC distribution, and computer peripheral protection requiring stable component supply and AEC-Q101 compliance.
Supply support for SMCG45A-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 reliability, efficiency, and automotive-grade qualification.
The SMCG series targets high-energy transient suppression in space-sensitive applications, combining AEC-Q101 qualification, low-profile packaging, and precise clamping for next-generation 48 V architectures and industrial IoT edge nodes.
FAQ
What is the polarity configuration of the SMCG45A-E3/57T?
The SMCG45A-E3/57T is a unidirectional transient voltage suppressor, with the cathode identified by a visible band on the DO-215AB package. It conducts only when the cathode is biased positively relative to the anode, making it suitable for DC rail protection where polarity is fixed. This differs from bidirectional variants like SMCG45CA, which lack polarity marking and suppress surges in both directions.
Does the SMCG45A-E3/57T meet automotive qualification standards?
Yes, the SMCG45A-E3/57T is AEC-Q101 qualified, having passed stress tests including high-temperature operating life, temperature cycling, and ESD per the AEC specification. This qualification confirms its suitability for under-hood and cabin-mounted automotive electronics, such as body control modules and ADAS power supplies, where long-term reliability under thermal and electrical stress is mandatory.
What is the maximum clamping voltage of the SMCG45A-E3/57T under rated surge conditions?
The SMCG45A-E3/57T clamps to 72.7 V when subjected to its rated 20.6 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during a full 1500 W transient event, ensuring downstream components remain within their absolute maximum ratings.
Can the SMCG45A-E3/57T be used in bidirectional signal line protection?
No - the SMCG45A-E3/57T is strictly unidirectional and must not be used on AC-coupled or bidirectional signal lines without external biasing. For such applications, Vishay specifies bidirectional variants like SMCG45CA, which have symmetrical breakdown characteristics and no polarity marking. Using SMCG45A-E3/57T in bidirectional roles risks forward conduction during normal signal swings and failure to suppress negative transients.
What is the thermal resistance and recommended pad layout for the SMCG45A-E3/57T?
The SMCG45A-E3/57T 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, as specified in the Vishay datasheet. Deviation from this pad size increases thermal impedance and reduces safe operating area; designers must replicate this layout to achieve rated 6.5 W power dissipation at TA = 50 °C.
SMCG45A-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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- 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)
SMCG45A-E3/57T FAQ
1.How can I place an order for SMCG45A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG45A-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 SMCG45A-E3/57T reliable?
The price and inventory of SMCG45A-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 SMCG45A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCG45A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG45A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG45A-E3/57T?
SMCG45A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG45A-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 SMCG45A-E3/57T?
For technical support, including SMCG45A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG45A-E3/57T requirements.
6.How does Aetrix verify that SMCG45A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG45A-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 SMCG45A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCG45A-E3/57T?
All SMCG45A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG45A-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 SMCG45A-E3/57T part is unused and in its original packaging.
Return procedure for SMCG45A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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