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Vishay General Semiconductor - Diodes Division SMCG40CA-M3/9AT
- Part No.:
- SMCG40CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG40CA-M3/9AT.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,239
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Product details
Overview
SMCG40CA-M3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for high-energy surge protection on signal and power lines. It features a 40 V stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 23.3 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMCG40CA-M3/9AT datasheet, SMCG40CA-M3/9AT pinout, SMCG40CA-M3/9AT application, or SMCG40CA-M3/9AT equivalent, this device is evaluated for bidirectional ESD/surge immunity in AEC-Q101-compliant systems requiring low incremental surge resistance, fast response time (<1 ns), and halogen-free RoHS compliance under JEDEC J-STD-020 MSL level 1.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) of 44.4–49.1 V at 1 mA test current and reverse leakage (ID) ≤1.0 µA at VWM = 40 V. Its clamping behavior is characterized under standardized 10/1000 µs surge waveforms, delivering consistent VC ≤64.5 V up to IPPM = 23.3 A when mounted on 8.0 mm × 8.0 mm copper pads.
Thermally, it exhibits RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable operation up to TJ = +150 °C. The glass-passivated junction and matte tin-plated leads meet JESD 22-B102 solderability and JESD 201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 44.4 V / 49.1 V at IT = 1 mA - Ensures tight breakdown tolerance for predictable turn-on |
| VC @ IPPM | 64.5 V at 23.3 A (10/1000 µs) - Limits downstream voltage stress during surge events |
| PPPM | 1500 W - Sustains high-energy transients common in automotive load-dump or inductive switching |
| ID @ VWM | ≤1.0 µA - Minimizes standby power loss and avoids false triggering in low-current circuits |
| TJ max | +150 °C - Supports under-hood automotive and industrial ambient temperature requirements |
| Package | SMCG (DO-215AB) - Surface-mount gull-wing leadform optimized for automated placement and thermal relief |
Pinout & Package
SMCG40CA-M3/9AT uses the SMCG (DO-215AB) surface-mount package: gull-wing leads, no polarity marking (bidirectional), matte tin-plated terminals, and UL 94 V-0 molding compound. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per Vishay's recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge path | No polarity marking; identical clamping in both directions - simplifies PCB layout and eliminates orientation errors |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance |
| Halogen-free & RoHS compliant (M3 suffix) | Meets environmental compliance mandates without compromising surge robustness or thermal performance |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio ≈ 1.45) versus standard TVS diodes - reduces protected IC voltage overshoot |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning or special handling |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog front-ends from ISO 7637-2 pulse 1, 2a, and 5a transients in engine control modules. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: With VC = 64.5 V and IPPM = 23.3 A, SMCG40CA-M3/9AT limits voltage seen by downstream 5 V or 12 V rail components below absolute maximum ratings during 10/1000 µs surges. |
Use Scenario: Guarding 4–20 mA current-loop inputs in programmable logic controllers against field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: Primary transient suppression device across input terminals, coordinated with series current-limiting resistors and filtering capacitors. Use Value: Low ID (≤1.0 µA) prevents loading of high-impedance current-sense paths, while 1500 W PPPM handles repetitive lightning-induced surges per IEC 61000-4-5. |
| Telecom Line Card Protection | Consumer Power Adapter Feedback Path |
Use Scenario: Safeguarding Ethernet PHY interface pins and PoE detection circuitry from induced transients on RJ45 ports. IC Role / Device Role / Timing Role: Secondary-level protection aligned with primary gas discharge tube (GDT) or polymer PTC, providing fast-response clamping after GDT fires. Use Value: Sub-nanosecond response ensures clamping occurs before GDT ionization completes, reducing let-through voltage to <65 V - within Ethernet IC safe operating area. |
Use Scenario: Shielding optocoupler feedback signals in AC/DC adapters from switching noise and output overvoltage transients. IC Role / Device Role / Timing Role: Bidirectional clamp across isolated feedback path (e.g., COMP/INV pins of PWM controller) to prevent latch-up or false regulation. Use Value: Symmetric VBR (44.4–49.1 V) and VC (64.5 V) ensure equal protection during positive/negative excursions, maintaining stable closed-loop regulation under surge conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CA-E3/57T | Same VWM (40 V), lower PPPM (400 W), SMA (DO-214AC) package, non-AEC-Q101 | Lower surge rating and no automotive qualification - suitable only for consumer/industrial non-critical lines | Select when cost sensitivity outweighs surge margin and automotive compliance is not required |
| SMCJ40CAHM3/9AT | Same VWM (40 V), higher PPPM (1500 W), identical AEC-Q101/halogen-free spec, but SMC (DO-214AB) package with higher RθJA (90 °C/W) | Less efficient thermal dissipation - requires larger copper area or derating above 75 °C ambient | Choose only if legacy SMC footprint compatibility is mandatory; otherwise SMCG offers superior thermal performance |
Compared with SMAJ40CA-E3/57T and SMCJ40CAHM3/9AT, SMCG40CA-M3/9AT delivers identical surge capability in a thermally superior DO-215AB package with AEC-Q101 validation - making it the optimal choice for space-constrained, high-reliability automotive and industrial designs where junction temperature management and qualification rigor are critical.
Availability
SMCG40CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and telecom line-card surge immunity requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMCG40CA-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCG series was developed specifically for high-power, surface-mount transient suppression in automotive and industrial environments - prioritizing AEC-Q101 compliance, low clamping ratio, and robust thermal performance in compact gull-wing packages.
FAQ
What is the clamping voltage of SMCG40CA-M3/9AT at its rated peak pulse current?
The SMCG40CA-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 with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal, as specified in Vishay's datasheet document 88457. The clamping performance ensures downstream ICs remain within safe operating voltage limits during surge events.
Is SMCG40CA-M3/9AT suitable for automotive applications?
Yes, SMCG40CA-M3/9AT is AEC-Q101 qualified and explicitly rated for automotive use. Its construction - including glass-passivated junction, halogen-free molding compound (M3 suffix), and MSL Level 1 reflow compatibility - meets stringent automotive reliability requirements. The device is deployed in engine control units, body electronics, and ADAS sensor interfaces where transient immunity to ISO 7637-2 pulses is mandatory.
How does the bidirectional nature of SMCG40CA-M3/9AT affect PCB layout?
The bidirectional design of SMCG40CA-M3/9AT eliminates polarity marking and allows placement in either orientation across differential or single-ended lines. Unlike unidirectional TVS diodes, no cathode band alignment is needed - reducing assembly errors and enabling simplified routing in space-constrained layouts such as automotive camera modules or CAN FD transceiver interfaces.
What is the thermal resistance of SMCG40CA-M3/9AT, and how does it impact power derating?
SMCG40CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. At ambient temperatures above 25 °C, its peak pulse power must be derated per Figure 2 in Vishay's datasheet 88457 - for example, at TA = 85 °C, usable PPPM drops to ~1050 W. Proper copper pad sizing (8.0 mm × 8.0 mm minimum) is essential to maintain this RθJA value.
Does SMCG40CA-M3/9AT require external current limiting in series?
No, SMCG40CA-M3/9AT does not require external current limiting for transient suppression, as it self-limits conduction once triggered. However, for sustained overvoltage conditions (e.g., DC fault), a series fuse or PTC is recommended to prevent thermal runaway. In normal operation, its low leakage (≤1.0 µA at 40 V) ensures negligible loading of sensitive analog or digital signal paths upstream of the SMCG40CA-M3/9AT.
SMCG40CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCG40CA-M3/9AT FAQ
1.How can I place an order for SMCG40CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG40CA-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 SMCG40CA-M3/9AT reliable?
The price and inventory of SMCG40CA-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 SMCG40CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG40CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG40CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG40CA-M3/9AT?
SMCG40CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG40CA-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 SMCG40CA-M3/9AT?
For technical support, including SMCG40CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG40CA-M3/9AT requirements.
6.How does Aetrix verify that SMCG40CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG40CA-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 SMCG40CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG40CA-M3/9AT?
All SMCG40CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG40CA-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 SMCG40CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG40CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG40CA-M3/9AT Tags
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