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Vishay General Semiconductor - Diodes Division SMCG45A-E3/9AT
- Part No.:
- SMCG45A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG45A-E3/9AT.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,728
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Product details
Overview
SMCG45A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor (TVS) in DO-215AB (SMCG) package, with 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR), 72.7 V clamping voltage (VC) at 20.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial power electronics.
For engineers reviewing the SMCG45A-E3/9AT datasheet, SMCG45A-E3/9AT pinout, SMCG45A-E3/9AT application, or SMCG45A-E3/9AT equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 1500 W surge capability with 10/1000 µs waveform, low clamping ratio (VC/VBR ≈ 1.38), 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 sensitive circuit nodes, triggering when reverse voltage exceeds VBR to divert surge current away from downstream components. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM).
Designed for high-reliability environments, it meets MSL Level 1 per J-STD-020, supports peak surge currents up to 200 A (IFSM, 8.3 ms half-sine), and maintains operation across –55 °C to +150 °C junction temperature range with RθJA = 75 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 50.0 V / 55.3 V at 1.0 mA - Confirmed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 72.7 V at 20.6 A - Clamped voltage during 10/1000 µs surge, limiting stress on protected ICs |
| PPPM | 1500 W - Peak transient energy handling capacity under standardized surge waveform |
| IR @ VWM | <1.0 µA - Ultra-low leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - Enables use in under-hood automotive and high-temperature industrial enclosures |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: DO-215AB (SMCG) - Low-profile, gull-wing surface-mount case with matte tin-plated leads solderable per J-STD-002; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 45 V supply rail or sensor output); band-marked end |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking preconditioning |
| Low incremental surge resistance | Minimizes VC rise under high di/dt surges, improving clamping precision |
| AEC-Q101 qualification | Validates robustness for automotive powertrain and body electronics applications |
| RoHS-compliant E3 suffix | Meets industrial-grade environmental compliance with no halogen restrictions |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: Protecting 48 V battery-supplied ECUs from load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 45 V rail and chassis ground to clamp positive-going spikes above VBR. Use Value: Limits transient voltage to ≤72.7 V, preventing damage to 50 V-rated CAN transceivers and microcontrollers. | Use Scenario: Shielding analog outputs of pressure sensors in motor control cabinets from EMI coupling. IC Role / Device Role / Timing Role: Parallel-connected clamping device on 0–5 V sensor output line referenced to system ground. Use Value: Sub-µA leakage avoids DC offset error; fast response (<1 ns) suppresses nanosecond-scale ESD events. |
| DC-DC Converter Input Stage | Telecom Power Interface Surge Guard |
Use Scenario: Safeguarding input stage of isolated 45 V input buck converters used in PoE-powered equipment. IC Role / Device Role / Timing Role: Primary overvoltage protection element upstream of input filter capacitor and controller IC. Use Value: 1500 W PPPM rating handles repetitive 10/1000 µs surges per IEC 61000-4-5 Level 4 without degradation. | Use Scenario: Front-end protection for 48 V telecom rectifier modules exposed to lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: First-line defense in series with fuse and common-mode choke on DC input bus. Use Value: AEC-Q101 qualification ensures long-term stability in continuous outdoor deployment with thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/57T | Same VWM/VBR/VC specs but SMA (DO-214AC) package; 600 W PPPM vs. 1500 W | Limited to lower-energy transients; unsuitable for automotive load-dump or industrial 4 kV surges | Select only if board space constraints prohibit SMCG footprint and surge requirements are ≤600 W |
| SMCJ45A-E3/9AT | Same DO-215AB package and 1500 W rating, but higher VBR (50.0–58.3 V) and VC (73.0 V) | Nearly identical clamping performance; minor VBR spread may affect turn-on timing margin | Drop-in alternative with same reel packaging (3500 pcs/13″ reel) and AEC-Q101 qualification |
Compared with SMAJ45A-E3/57T, SMCG45A-E3/9AT delivers 2.5× higher surge power handling in identical mounting area; versus SMCJ45A-E3/9AT, it offers tighter VBR tolerance (±5.5% vs. ±8.3%) and lower clamping voltage, improving protection margin for 45 V systems.
Availability
SMCG45A-E3/9AT is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface, and telecom DC input protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMCG45A-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 for high-reliability applications.
The SMCG series targets automotive and industrial transient suppression, emphasizing AEC-Q101 qualification, high-power clamping, and robust SMT packaging for automated manufacturing.
FAQ
What is the maximum clamping voltage of the SMCG45A-E3/9AT under standard test conditions?
The SMCG45A-E3/9AT has a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current (IPPM) of 20.6 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCG45A-E3/9AT maintains this clamping performance across its full operating temperature range.
Is the SMCG45A-E3/9AT suitable for automotive applications?
Yes, the SMCG45A-E3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its –55 °C to +150 °C operating junction temperature range, MSL Level 1 moisture sensitivity, and validation against temperature cycling, HTRB, and surge endurance make it appropriate for engine control units, body electronics, and ADAS power supplies. The SMCG45A-E3/9AT meets these requirements without derating.
What does the "E3/9AT" suffix indicate in SMCG45A-E3/9AT?
The "E3" suffix denotes RoHS-compliant, industrial-grade construction with matte tin-plated leads; "9AT" specifies packaging in 13-inch diameter plastic tape and reel containing 3500 units. This differs from "57T" (7-inch reel, 850 units) and confirms compatibility with high-volume SMT assembly lines. The SMCG45A-E3/9AT uses the same die and electrical specs regardless of reel size.
How does the SMCG45A-E3/9AT compare to bidirectional TVS diodes like SMCG45CA?
The SMCG45A-E3/9AT is unidirectional and intended for DC line protection where polarity is fixed, offering lower leakage (<1.0 µA) and forward voltage drop (VF = 3.5 V at 100 A). In contrast, SMCG45CA is bidirectional, suited for AC or floating signal lines but exhibits higher ID at VWM. The SMCG45A-E3/9AT cannot replace SMCG45CA in AC-coupled applications due to polarity asymmetry.
What PCB pad layout is recommended for optimal thermal and surge performance of the SMCG45A-E3/9AT?
Vishay specifies a minimum 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pad area per terminal to achieve rated PPPM and thermal resistance (RθJA = 75 °C/W). Using smaller pads reduces surge current handling and increases junction temperature during repeated transients. The SMCG45A-E3/9AT must be mounted per the DO-215AB outline drawing with controlled solder paste volume to avoid tombstoning or voiding.
SMCG45A-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):
- 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-E3/9AT FAQ
1.How can I place an order for SMCG45A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG45A-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 SMCG45A-E3/9AT reliable?
The price and inventory of SMCG45A-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 SMCG45A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG45A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG45A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG45A-E3/9AT?
SMCG45A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG45A-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 SMCG45A-E3/9AT?
For technical support, including SMCG45A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG45A-E3/9AT requirements.
6.How does Aetrix verify that SMCG45A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG45A-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 SMCG45A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG45A-E3/9AT?
All SMCG45A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG45A-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 SMCG45A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG45A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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