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Vishay General Semiconductor - Diodes Division SMCG40A-E3/9AT
- Part No.:
- SMCG40A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG40A-E3/9AT.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,558
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Product details
Overview
SMCG40A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor (TVS) in DO-215AB (SMCG) package, featuring 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 1500 W peak pulse power (PPPM), and 23.3 A peak pulse current (IPPM) at 10/1000 µs waveform - deployed for clamping inductive switching transients on automotive power rails and industrial sensor interfaces.
For engineers reviewing the SMCG40A-E3/9AT datasheet, SMCG40A-E3/9AT pinout, SMCG40A-E3/9AT application, or SMCG40A-E3/9AT equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), clamping behavior (VC = 64.5 V at IPPM), and RoHS-compliant industrial-grade packaging with matte tin terminals.
Technical Context
The SMCG40A-E3/9AT uses a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance, enabling effective suppression of ESD and lightning-induced surges per IEC 61000-4-2/4-5. Its unidirectional polarity (cathode-banded) supports DC-biased protection paths without reverse conduction.
Rated for TJ = –55 °C to +150 °C and qualified to AEC-Q101, it operates with 1000 µA maximum reverse leakage at VWM = 40 V and delivers 64.5 V clamping voltage under full 1500 W surge - validated on 8.0 mm × 8.0 mm copper pads per JEDEC standard mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates; sets upper limit for protected circuit DC bias. |
| VBR min/max | 44.4 V / 49.1 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM with <12% tolerance. |
| PPPM | 1500 W (10/1000 µs) - Sustains high-energy transients common in automotive load-dump and industrial motor switching events. |
| VC @ IPPM | 64.5 V - Clamped voltage during full-rated surge; defines maximum stress imposed on downstream ICs or MOSFETs. |
| ID @ VWM | 1.0 µA - Ultra-low leakage preserves battery life and signal integrity in always-on sensor nodes and low-power ECUs. |
| RθJA | 75 °C/W - Thermal resistance enables 6.5 W steady-state dissipation at TA = 50 °C with standard PCB copper pad layout. |
| AEC-Q101 | Qualified - Validated for automotive under-hood and chassis applications requiring reliability across temperature cycling, humidity, and mechanical shock. |
Pinout & Package
Package: DO-215AB (SMCG) - Low-profile, surface-mount gull-wing package with 3.17 mm lead pitch, 7.87 mm body length, and 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 system ground or low-side reference in unidirectional TVS configuration. | Provides return path during clamping; must be routed with low-inductance trace to minimize voltage overshoot during fast transients. |
| Cathode | Current exit terminal in forward bias; marked by band on package; connects to protected line (e.g., 40 V supply rail). | Defines polarity-sensitive placement - reversal causes open-circuit failure under overvoltage; critical for correct protection orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR over lifetime and immunity to moisture-induced parameter drift in humid environments (e.g., engine control units). |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without popcorn effect or delamination - eliminates pre-bake requirement for SMT assembly. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving protection margin for sensitive 3.3 V or 5 V logic interfaces. |
| RoHS-compliant, industrial grade (E3 suffix) | Meets EU RoHS Directive 2011/65/EU and JESD201 Class 2 whisker resistance - suitable for long-lifecycle industrial automation systems. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V power distribution networks in engine control modules against ISO 7637-2 load dump pulses and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and point-of-load regulator input to clamp surges up to 1500 W without conduction in normal operation. Use Value: Limits transient voltage to ≤64.5 V, preventing damage to downstream PMICs and microcontrollers rated for 40 V absolute maximum input. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) of pressure/temperature sensors from ESD and cable discharge events in factory-floor PLC cabinets. IC Role / Device Role / Timing Role: Standoff-mode protector mounted directly at connector entry, absorbing ±8 kV contact ESD per IEC 61000-4-2 with <1 ns response. Use Value: Maintains signal fidelity via 1.0 µA leakage at 40 V, avoiding offset errors in precision current-loop receivers while surviving repeated surges. |
| DC Motor Drive Gate Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Safeguarding high-side N-channel MOSFET gate drivers in brushed DC motor controllers subjected to back-EMF spikes during commutation. IC Role / Device Role / Timing Role: Clamp diode tied between gate and source, limiting VGS excursion to 64.5 V during 100 ns–1 µs inductive kick events. Use Value: Prevents gate oxide rupture in 60 V-rated MOSFETs by holding VGS below 70% of rated maximum, extending FET lifetime in cyclic duty applications. |
Use Scenario: Front-end protection of Ethernet PHY power supplies and data lines in outdoor telecom base station line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC feed, coordinated with secondary GDTs and polymer PTCs to meet ITU-T K.20/21 immunity requirements. Use Value: Delivers 1500 W surge handling with 75 °C/W RθJA, enabling thermal stability during multi-pulse surge testing without derating at 70 °C ambient. |
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 package (DO-214AC), RθJA = 110 °C/W. | Limited to lower-energy transients; unsuitable for automotive load dump or industrial motor drive surges. | Select when cost or board space is prioritized over surge robustness and thermal performance. |
| SMCJ40A-E3/9AT | Same VWM (40 V), higher PPPM (3000 W), larger SMC package (DO-214AB), RθJA = 40 °C/W. | Requires more PCB area but supports dual-pulse surge testing and extended thermal margin in high-ambient environments. | Choose for mission-critical automotive ADAS modules where 2× energy margin and lower thermal resistance are mandatory. |
Compared with SMAJ40A-E3/57T, SMCG40A-E3/9AT offers 275% higher surge power and 32% better thermal resistance in a compact DO-215AB footprint; versus SMCJ40A-E3/9AT, it trades 50% surge capacity for 40% smaller board area and identical AEC-Q101 qualification.
Availability
SMCG40A-E3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, DC motor gate driver safeguarding, and telecom line card surge suppression requiring stable component supply across production lifecycles.
Supply support for SMCG40A-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, with emphasis on reliability, power handling, and automotive-grade qualification.
The SMCG series targets high-energy transient suppression in space-constrained automotive and industrial applications, combining AEC-Q101 compliance, low-profile packaging, and precise clamping performance for next-generation ECUs and smart sensors.
FAQ
What is the clamping voltage of the SMCG40A-E3/9AT under full-rated surge conditions?
The SMCG40A-E3/9AT clamps to 64.5 V when subjected to its maximum rated peak pulse current (IPPM = 23.3 A) using the standardized 10/1000 µs waveform. This value is measured under JEDEC-defined test conditions with 8.0 mm × 8.0 mm copper pads per terminal and represents the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMCG40A-E3/9AT maintains this clamping performance consistently across its qualified temperature range.
Is the SMCG40A-E3/9AT suitable for automotive applications?
Yes, the SMCG40A-E3/9AT carries AEC-Q101 qualification, confirming its suitability for automotive use cases including engine control units, body electronics, and ADAS subsystems. It operates reliably from –55 °C to +150 °C, withstands thermal cycling and mechanical shock per AEC requirements, and features RoHS-compliant matte tin plating compatible with automotive assembly processes. The SMCG40A-E3/9AT meets these criteria without derating in under-hood environments.
What does the "E3/9AT" suffix indicate in SMCG40A-E3/9AT?
The "E3" suffix denotes RoHS-compliant, industrial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD201 Class 2 whisker resistance. The "9AT" indicates packaging in 13-inch diameter plastic tape and reel, with a base quantity of 3500 units per reel - optimized for high-volume SMT production lines. This configuration applies specifically to the SMCG40A-E3/9AT and is distinct from smaller 7-inch reels (e.g., /57T).
How does the SMCG40A-E3/9AT compare to bidirectional TVS diodes like SMCG40CA?
The SMCG40A-E3/9AT is unidirectional and intended for DC-biased lines where polarity is fixed (e.g., positive supply rails); SMCG40CA is bidirectional and used in AC or floating signal paths (e.g., data lines). Both share identical VWM (40 V), PPPM (1500 W), and package (DO-215AB), but the SMCG40A-E3/9AT exhibits 1000 µA reverse leakage at VWM, whereas SMCG40CA doubles that limit to 2000 µA per specification note (3). The SMCG40A-E3/9AT requires cathode-band orientation during placement.
What is the thermal resistance of the SMCG40A-E3/9AT, and how does it affect power handling?
The SMCG40A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pads. At TA = 50 °C, this allows continuous power dissipation up to 6.5 W - sufficient for managing residual leakage and minor repetitive transients. For sustained surge duty, the device relies on short-duration pulse ratings (e.g., 1500 W at 10/1000 µs), not steady-state thermal limits. The SMCG40A-E3/9AT's RθJA enables predictable thermal design without heatsinking in most automotive and industrial layouts.
SMCG40A-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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCG)
SMCG40A-E3/9AT FAQ
1.How can I place an order for SMCG40A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG40A-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 SMCG40A-E3/9AT reliable?
The price and inventory of SMCG40A-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 SMCG40A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG40A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG40A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG40A-E3/9AT?
SMCG40A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG40A-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 SMCG40A-E3/9AT?
For technical support, including SMCG40A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG40A-E3/9AT requirements.
6.How does Aetrix verify that SMCG40A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG40A-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 SMCG40A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG40A-E3/9AT?
All SMCG40A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG40A-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 SMCG40A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG40A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG40A-E3/9AT Tags
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