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Vishay General Semiconductor - Diodes Division SMCG40AHE3/9AT
- Part No.:
- SMCG40AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG40AHE3/9AT.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,659
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Product details
Overview
SMCG40AHE3/9AT 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 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (PPPM), 23.3 A peak pulse current (IPPM), and clamps to ≤64.5 V at rated surge. It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power rails.
For engineers reviewing the SMCG40AHE3/9AT datasheet, SMCG40AHE3/9AT pinout, SMCG40AHE3/9AT application, or SMCG40AHE3/9AT equivalent, this page delivers verified electrical parameters, mechanical package details, real-world protection use cases, and validated alternative parts - all specific to the SMCG40AHE3/9AT variant with HE3 (AEC-Q101) and 9AT (3500-piece reel) suffixes.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, responding to transients within picoseconds via avalanche breakdown. Its glass-passivated junction ensures stable leakage and repeatable VBR, while its low incremental surge resistance enables effective energy diversion during 10/1000 µs surges.
The SMCG40AHE3/9AT is rated for -55 °C to +150 °C operation, meets MSL Level 1 per J-STD-020, and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. Its DO-215AB package provides 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 | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR min/max | 44.4 V / 49.1 V at IT = 1 mA - Confirmed breakdown range ensuring reliable turn-on without premature conduction. |
| VC @ IPPM | ≤64.5 V at 23.3 A - Clamping voltage under full 1500 W surge; determines maximum stress on downstream components. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 µs waveform; defines single-event surge capability. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at stand-off voltage; critical for low-power sensor and battery-backed circuits. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive and high-ambient industrial use. |
| Package | SMCG (DO-215AB) - Surface-mount gull-wing package with 0.31" × 0.31" pad layout; optimized for automated placement and reflow. |
Pinout & Package
SMCG40AHE3/9AT uses the SMCG (DO-215AB) package: a 2-terminal surface-mount gull-wing outline with cathode band marking. Terminals are matte tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point for unidirectional clamping | Connects to protected line; reverse-biased during normal operation; conducts during positive transients on anode side. |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage over lifetime, even under thermal stress and humidity exposure. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a), improving protection margin. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking - simplifies SMT manufacturing and reduces process risk. |
| UL 94 V-0 molding compound | Provides flame-retardant encapsulation essential for safety-critical applications in automotive and industrial enclosures. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp positive surges above 40 V. Use Value: Limits peak voltage to ≤64.5 V during 1500 W surges, preventing damage to 36 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS shunting induced EFT bursts on 0–10 V or 4–20 mA signal paths. Use Value: Maintains signal integrity with <1 µA leakage at 40 V, while clamping 1 kV/50 Ω EFT pulses to safe levels for precision ADC front-ends. |
| Motor Drive Gate Driver Protection | Telecom DC Power Input Protection |
Use Scenario: Shielding high-side N-channel MOSFET gate drivers from inductive kickback in BLDC motor controllers. IC Role / Device Role / Timing Role: Fast-response (ps-scale) TVS across gate-source to suppress >100 V spikes during switching transitions. Use Value: Responds within picoseconds and clamps to ≤64.5 V, preventing gate oxide rupture in 60 V-rated MOSFETs. |
Use Scenario: Guarding -48 V telecom rectifier outputs against lightning-induced surges on central office power distribution. IC Role / Device Role / Timing Role: High-power (1500 W) unidirectional TVS on input bus to absorb multi-kA surge currents. Use Value: Handles 23.3 A peak pulse current with 75 °C/W thermal resistance, enabling reliable operation on standard PCB copper pads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/57T | Same VWM (40 V), lower PPPM (400 W), SMA (DO-214AC) package, non-AEC-Q101. | Limited to consumer/industrial use; insufficient for automotive load dump where 1500 W is mandated. | Select when cost and board space are prioritized over automotive qualification and high-energy surge handling. |
| SMCJ40AHE3/9AT | Same VWM (40 V), same AEC-Q101 and HE3/9AT suffixes, but SMC (DO-214AB) package with higher thermal mass. | Offers better thermal dissipation (RθJA ≈ 35 °C/W vs. 75 °C/W) but requires larger footprint and different pad layout. | Choose for high-reliability industrial systems needing enhanced thermal performance and longer surge endurance. |
Compared with SMAJ40A-E3/57T, SMCG40AHE3/9AT delivers 3.75× higher surge power and automotive qualification; versus SMCJ40AHE3/9AT, it trades thermal margin for compact DO-215AB size - ideal where space-constrained automotive PCBs demand minimal footprint without sacrificing AEC-Q101 compliance.
Availability
SMCG40AHE3/9AT is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power input protection requiring stable component supply across long production lifecycles.
Supply support for SMCG40AHE3/9AT 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, and protection devices with emphasis on reliability, efficiency, and automotive-grade validation.
The SMCG series was engineered specifically for space-constrained, high-surge automotive and industrial applications - delivering AEC-Q101-compliant transient protection in the smallest possible DO-215AB footprint.
FAQ
What is the clamping voltage of SMCG40AHE3/9AT at its rated peak pulse current?
The SMCG40AHE3/9AT has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current (IPPM) of 23.3 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SMCG40AHE3/9AT maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMCG40AHE3/9AT suitable for bidirectional transient protection?
No, SMCG40AHE3/9AT is a unidirectional TVS diode, indicated by the "A" suffix (vs. "CA" for bidirectional variants like SMCG40CA). Its cathode band marks the polarity-sensitive terminal, and it only clamps positive transients on the anode side relative to cathode. For bidirectional protection - such as AC line or data bus applications - a part with the CA suffix must be selected. The SMCG40AHE3/9AT is not rated for reverse conduction beyond its specified leakage.
What does the "HE3" suffix mean in SMCG40AHE3/9AT?
The "HE3" suffix in SMCG40AHE3/9AT denotes RoHS-compliant construction with AEC-Q101 qualification - confirming that the device meets rigorous automotive reliability standards including temperature cycling, highly accelerated life testing (HALT), and electrostatic discharge (ESD) immunity. It also specifies matte tin plating per J-STD-002 and JESD 22-B102, and compliance with JESD 201 Class 2 whisker resistance. This distinguishes it from industrial-grade "E3" variants lacking automotive qualification.
What is the thermal resistance of SMCG40AHE3/9AT, and how does it affect layout?
The SMCG40AHE3/9AT 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 - as defined in the Vishay datasheet. This value assumes no additional thermal vias or internal planes. To maintain safe operation under repeated surges, PCB layout must replicate this minimum pad area; reducing pad size increases junction temperature and risks thermal runaway during sustained or repetitive transients.
How does SMCG40AHE3/9AT compare to SMAJ40A in terms of surge capability?
SMCG40AHE3/9AT delivers 1500 W peak pulse power (PPPM) under a 10/1000 µs waveform, whereas SMAJ40A is rated for only 400 W. This 3.75× higher surge capacity enables the SMCG40AHE3/9AT to withstand automotive load dump events (ISO 7637-2 Test 5a) and industrial lightning surges that would exceed the energy-handling limit of SMAJ40A. Both share 40 V VWM, but SMCG40AHE3/9AT's DO-215AB package and AEC-Q101 qualification further differentiate its application scope.
SMCG40AHE3/9AT 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 23.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCG)
SMCG40AHE3/9AT FAQ
1.How can I place an order for SMCG40AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG40AHE3/9AT 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 SMCG40AHE3/9AT reliable?
The price and inventory of SMCG40AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG40AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG40AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG40AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG40AHE3/9AT?
SMCG40AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG40AHE3/9AT 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 SMCG40AHE3/9AT?
For technical support, including SMCG40AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG40AHE3/9AT requirements.
6.How does Aetrix verify that SMCG40AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG40AHE3/9AT 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 SMCG40AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG40AHE3/9AT?
All SMCG40AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG40AHE3/9AT, 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 SMCG40AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCG40AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG40AHE3/9AT Tags
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