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Vishay General Semiconductor - Diodes Division SMCG40A-M3/9AT
- Part No.:
- SMCG40A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG40A-M3/9AT.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,225
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Product details
Overview
SMCG40A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, with 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) under 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines from inductive switching transients in automotive and industrial power electronics.
For engineers reviewing the SMCG40A-M3/9AT datasheet, SMCG40A-M3/9AT pinout, SMCG40A-M3/9AT application, or SMCG40A-M3/9AT equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and real-world clamping behavior (VC = 64.5 V at IPPM) for robust overvoltage protection design.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, optimized for fast response (<1 ns) to ESD and surge events. Its glass-passivated junction ensures stable breakdown characteristics, while the DO-215AB package supports automated placement and meets UL 94 V-0 flammability rating.
Designed for operation across -55 °C to +150 °C junction temperature range, it delivers 6.5 W power dissipation at TA = 50 °C on infinite heatsink and exhibits low incremental surge resistance - critical for maintaining low clamping voltage during high-energy transients like ISO 7637-2 Pulse 1/2a/5a in automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below system rail. |
| VBR min/max | 44.4 V / 49.1 V at IT = 1 mA - guaranteed breakdown threshold window; ensures consistent turn-on across production lots. |
| VC @ IPPM | 64.5 V at IPPM = 23.3 A (10/1000 µs) - clamping voltage during worst-case surge; determines protected circuit's maximum stress level. |
| PPPM | 1500 W - peak transient power handling capability; enables protection against high-energy surges per IEC 61000-4-5 Level 4. |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; informs board-level thermal design for reliability. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive environments without derating. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMCG (DO-215AB) - surface-mount gull-wing leaded package with matte tin-plated terminals, 0.220–0.245 inch body length, and MSL Level 1 moisture sensitivity rating (peak reflow ≤ 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to ground or lower-potential node in unidirectional TVS configuration. |
| Cathode | Current exit terminal in forward bias; marked with band | Connected to protected line (e.g., CAN_H, LIN, or 12 V rail); clamps to anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free & RoHS compliant | M3 suffix confirms full halogen-free material set and RoHS compliance per JEDEC J-STD-020, supporting green manufacturing requirements. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS sensors requiring long-term reliability under thermal and mechanical stress. |
| Low clamping ratio (VC/VBR ≈ 1.36) | Ensures minimal overvoltage overshoot during surge events - critical for safeguarding 3.3 V or 5 V logic interfaces downstream of protection. |
| Fast response time (<1 ns) | Enables suppression of ESD events (IEC 61000-4-2 ±8 kV contact) before sensitive gate oxides or data lines are damaged. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile usage without baking - reduces manufacturing complexity and cost. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in vehicle door modules, seat controllers, and lighting ECUs from load-dump transients (ISO 7637-2 Pulse 5a) and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and local regulator input to clamp surges above 40 V before they reach LDOs or microcontrollers. Use Value: Withstands 1500 W pulses and clamps to 64.5 V, preventing damage to downstream 42 V-rated regulators and ensuring ASIL-B functional safety compliance. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) and digital sensor interfaces (I²C, SPI) in factory automation PLCs and motor drives. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable here; SMCG40A-M3/9AT serves as unidirectional rail clamp on sensor VDD or signal return path. Use Value: Low leakage (<1 µA at 40 V) avoids measurement drift, while 75 °C/W RθJA allows thermal stability on compact PCBs without heatsinking. |
| Telecom DC Power Input | Consumer Device USB Port Protection |
Use Scenario: Securing 48 V DC input stages of PoE-powered switches, base stations, and remote radio units against lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Primary front-end TVS on DC input before DC-DC converter, configured anode-to-ground to shunt positive transients. Use Value: 23.3 A IPPM and 64.5 V VC ensure compliance with IEC 61000-4-5 (1.2/50 µs + 8/20 µs combo wave) up to 1 kV open-circuit test level. | Use Scenario: Adding secondary overvoltage protection on VBUS line of USB-C ports in laptops and docking stations where primary protection may be insufficient for sustained 20 V faults. IC Role / Device Role / Timing Role: Standby clamping device activated only during overvoltage events exceeding 40 V, complementing integrated USB switch OVP. Use Value: Halogen-free M3 construction meets consumer product environmental mandates, and DO-215AB footprint enables high-density layout near connector. |
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, E3 suffix (standard RoHS, not halogen-free) | Rated for commercial/industrial use only; unsuitable for automotive under-hood deployment due to lower power rating and qualification gap | Select when cost-sensitive, non-automotive designs require basic 40 V clamping with legacy SMA footprint compatibility. |
| SMCJ40A-M3 | Same VWM (40 V), higher PPPM (3000 W), SMC (DO-214AB) package, AEC-Q101 qualified, same M3 halogen-free compliance | Physically larger (7.11 mm × 6.22 mm vs. SMCG's 6.60 mm × 5.59 mm); requires more PCB area but handles double the surge energy | Choose when system-level surge immunity must exceed IEC 61000-4-5 Level 4 or when longer surge duration (e.g., 10/1000 µs > 100 A) is expected. |
Compared with SMAJ40A-E3/57T and SMCJ40A-M3, SMCG40A-M3/9AT delivers optimal balance of automotive qualification, halogen-free compliance, compact DO-215AB footprint, and 1500 W surge capacity - making it ideal for space-constrained, thermally demanding, and AEC-Q101–mandated applications where both size and reliability are critical.
Availability
SMCG40A-M3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power inputs requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMCG40A-M3/9AT 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMCG series is designed specifically for high-power, surface-mount transient suppression in automotive and industrial systems - prioritizing AEC-Q101 qualification, low-profile packaging, and precise clamping performance under repetitive surge stress.
FAQ
What is the clamping voltage of SMCG40A-M3/9AT at its rated peak pulse current?
The SMCG40A-M3/9AT has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current (IPPM) of 23.3 A under the standard 10/1000 µs waveform. This value is measured per test condition specified in Vishay document 88457 and defines the upper voltage limit imposed on protected circuits during surge events - a key parameter for ensuring downstream ICs remain within absolute maximum ratings.
Is SMCG40A-M3/9AT suitable for automotive applications?
Yes, SMCG40A-M3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its construction features glass-passivated junction, halogen-free materials (M3 suffix), and thermal performance (TJ max = +150 °C) validated per AEC stress tests. The SMCG40A-M3/9AT is deployed in engine control modules, body electronics, and ADAS sensor interfaces where reliability under thermal cycling and surge stress is mandatory.
What does the "M3" suffix mean in SMCG40A-M3/9AT?
The "M3" suffix in SMCG40A-M3/9AT indicates halogen-free, RoHS-compliant construction meeting JEDEC J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance requirements. Unlike E3 (RoHS only), M3 ensures full elimination of brominated flame retardants and chlorine-based compounds - satisfying strict environmental mandates for automotive and consumer electronics without compromising electrical or thermal performance of the SMCG40A-M3/9AT.
How does SMCG40A-M3/9AT differ from bidirectional variants like SMCG40CA?
SMCG40A-M3/9AT is unidirectional with cathode-band marking and conducts only in reverse breakdown; SMCG40CA is bidirectional with symmetrical breakdown in both polarities and no polarity marking. The SMCG40A-M3/9AT offers lower leakage (<1 µA at 40 V) and is preferred for DC rail protection, whereas SMCG40CA suits AC-coupled or differential signal lines like RS-485. Their VBR and VC values differ slightly due to internal structure - SMCG40A-M3/9AT VBR is 44.4–49.1 V, while SMCG40CA is 45.6–50.4 V.
What is the thermal resistance of SMCG40A-M3/9AT, and how does it affect PCB layout?
The SMCG40A-M3/9AT 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. This value assumes minimum recommended pad layout per Vishay spec; reducing pad area increases RθJA and risks thermal runaway during repeated surges. For reliable operation in high-duty-cycle applications, maintain full copper pour under both terminals and avoid narrow traces - critical for sustaining the SMCG40A-M3/9AT's 6.5 W power dissipation rating at TA = 50 °C.
SMCG40A-M3/9AT 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-M3/9AT FAQ
1.How can I place an order for SMCG40A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG40A-M3/9AT 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-M3/9AT reliable?
The price and inventory of SMCG40A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG40A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG40A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG40A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG40A-M3/9AT?
SMCG40A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG40A-M3/9AT 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-M3/9AT?
For technical support, including SMCG40A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG40A-M3/9AT requirements.
6.How does Aetrix verify that SMCG40A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG40A-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG40A-M3/9AT?
All SMCG40A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG40A-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG40A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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