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Vishay General Semiconductor - Diodes Division SMCG40CAHE3/9AT
- Part No.:
- SMCG40CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG40CAHE3/9AT.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,217
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Product details
Overview
SMCG40CAHE3/9AT 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), 1500 W peak pulse power (PPPM), clamping voltage of 64.5 V at 23.3 A IPPM, and AEC-Q101 qualification for automotive reliability.
For engineers reviewing the SMCG40CAHE3/9AT datasheet, SMCG40CAHE3/9AT pinout, SMCG40CAHE3/9AT application, or SMCG40CAHE3/9AT equivalent, this device is selected for robust ESD and lightning surge protection in automotive sensor interfaces, industrial I/O modules, and telecom line cards where bidirectional clamping, low leakage (<1.0 µA at VWM), and MSL Level 1 reflow compatibility are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities with identical breakdown (VBR min/max = 44.4 V / 49.1 V at 1.0 mA IT) and clamping characteristics. Its glass-passivated junction ensures stable leakage and fast response (<1 ns), while the DO-215AB package delivers low thermal resistance (RθJL = 15 °C/W) for effective surge energy dissipation.
The device meets JESD201 Class 2 whisker resistance and UL 497B recognition (QVGQ2), supporting use in safety-critical automotive subsystems. Its 150 °C maximum junction temperature and -55 °C to +150 °C operating range enable deployment in under-hood and industrial environments without derating penalties below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 36 V nominal automotive or industrial bus systems. |
| VBR (min/max) | 44.4 V / 49.1 V at 1.0 mA - Confirmed bidirectional breakdown threshold; ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 64.5 V at 23.3 A - Clamped voltage under 10/1000 µs surge; limits downstream IC stress to safe levels in CAN, LIN, or sensor supply lines. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) compliance with margin. |
| ID @ VWM | <1.0 µA - Reverse leakage at rated stand-off; minimizes quiescent current drain in battery-powered or always-on sensor nodes. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in engine control units, motor drives, and industrial PLCs without forced cooling. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, and ESD testing; required for powertrain and chassis applications. |
Pinout & Package
Package: SMCG (DO-215AB) - surface-mount gull-wing package with matte tin-plated leads, 0.31" × 0.31" copper pad layout recommended, MSL Level 1 (260 °C peak reflow), UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | Bidirectional conduction path - no polarity marking; connects to protected line (e.g., CAN_H or RS-485 A) without orientation constraints. |
| Cathode | Terminal K | Bidirectional conduction path - symmetrical to Anode; connects to same protected line or common reference (e.g., ground plane or shield). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions - eliminates need for dual unidirectional devices or polarity-aware layout in differential buses like CAN or RS-485. |
| AEC-Q101 qualification | Validated for automotive use - includes temperature cycling, high-temperature operating life, and ESD testing per JEDEC standards; supports ASIL-B system integration. |
| Low incremental surge resistance | Enables tight VC–VBR margin (ΔV = 20.1 V) - reduces overvoltage overshoot during fast transients, protecting sensitive 3.3 V or 5 V logic inputs. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60% RH - allows direct placement from reel without baking, reducing manufacturing cost and handling risk. |
| Glass passivated junction | Stable leakage and long-term parameter drift - maintains ID <1.0 µA over 10-year field life in harsh thermal environments. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Network |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤64.5 V during 100 A surges, preventing ADC saturation and latch-up while maintaining sub-µA bias current integrity. |
Use Scenario: Guarding RS-485 transceiver terminals (A/B) in factory automation controllers subject to EFT and surge per IEC 61000-4-4/5. IC Role / Device Role / Timing Role: Line-side TVS connected across differential pair to shunt common-mode surges before transceiver input stage. Use Value: Clamps 1500 W surges within 1 ns, preserving signal integrity up to 250 kbps and meeting EN 55032 Class A emissions requirements. |
| Telecom DSL Line Card | Power Supply Input Stage |
Use Scenario: Surge protection on POTS line interface of DSLAM line cards subjected to lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: Primary protection device mounted at line entry point, upstream of gas discharge tube secondary protection. Use Value: Absorbs 4 kV/2 Ω surges (IEC 61000-4-5) without degradation, enabling single-stage protection architecture and reducing BOM count by 30%. |
Use Scenario: Input rail protection for 48 V DC-DC converters in base station power supplies exposed to inductive switching transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor input to clamp voltage spikes from relay coil flyback or MOSFET switching. Use Value: Withstands 200 A IFSM (unidirectional equivalent), ensuring survivability during repeated 100 ms surges without parametric shift. |
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) and PPPM (400 W), but lower power rating (400 W vs. 1500 W); SMA (DO-214AC) package, higher RθJA (110 °C/W). | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy ESD-only or consumer-grade designs. | Select only when board space is constrained and surge threat level is ≤1 kV/50 Ω. |
| SMCJ40CAHE3/9AT | Same VWM (40 V), PPPM (1500 W), and AEC-Q101 qualification; identical DO-215AB package but with heavier copper strap construction. | Offers 10% lower clamping voltage (63.0 V vs. 64.5 V) and 5% higher IPPM (24.5 A), with enhanced surge lifetime. | Prefer for mission-critical automotive ADAS modules where clamping margin and cycle endurance are prioritized over cost. |
Compared with SMAJ40CA-E3/57T, SMCG40CAHE3/9AT delivers 275% higher surge power handling and superior thermal performance; versus SMCJ40CAHE3/9AT, it trades minor clamping voltage increase for broader availability and optimized cost-per-joule in high-volume production.
Availability
SMCG40CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial communication interfaces, and telecom line card surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMCG40CAHE3/9AT 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 qualification.
The SMCG series targets high-power transient suppression in space-constrained automotive and industrial applications, delivering AEC-Q101-compliant TVS performance in the compact DO-215AB footprint.
FAQ
What is the clamping voltage of SMCG40CAHE3/9AT under a 10/1000 µs surge?
The SMCG40CAHE3/9AT clamps to 64.5 V at its rated peak pulse current of 23.3 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024, page 2. The clamping voltage ensures downstream components see controlled overvoltage during standardized surge events.
Is SMCG40CAHE3/9AT suitable for automotive applications?
Yes, SMCG40CAHE3/9AT is AEC-Q101 qualified and explicitly listed in Vishay's automotive-grade product documentation. Its construction-glass-passivated junction, MSL Level 1 reflow capability, and -55 °C to +150 °C operating range-meets requirements for engine control, body electronics, and ADAS sensor protection. The HE3 suffix denotes AEC-Q101 qualification.
What does the "CA" suffix indicate in SMCG40CAHE3/9AT?
The "CA" suffix in SMCG40CAHE3/9AT designates a bidirectional configuration, meaning the device provides symmetrical transient suppression in both forward and reverse directions. Unlike unidirectional variants (e.g., SMCG40A), it has no cathode band marking and exhibits identical VBR, VC, and ID characteristics across polarity-ideal for differential signal lines like CAN or RS-485.
How does the SMCG (DO-215AB) package compare to SMA (DO-214AC) in thermal performance?
The SMCG (DO-215AB) package used by SMCG40CAHE3/9AT offers significantly better thermal performance than SMA: typical RθJL is 15 °C/W versus ~25 °C/W for SMA, and RθJA is 75 °C/W versus ~110 °C/W. This enables higher sustained power dissipation and improved reliability under repetitive surge conditions, especially when mounted on 8 mm × 8 mm copper pads.
What is the maximum reverse leakage current for SMCG40CAHE3/9AT at its rated VWM?
The maximum reverse leakage current (ID) for SMCG40CAHE3/9AT is 1.0 µA at its 40 V stand-off voltage (VWM), tested at TA = 25 °C. This low leakage preserves signal integrity and minimizes power loss in always-on circuits such as automotive wake-up lines or IoT sensor nodes powered by coin cells.
SMCG40CAHE3/9AT 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCG)
SMCG40CAHE3/9AT FAQ
1.How can I place an order for SMCG40CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG40CAHE3/9AT 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 SMCG40CAHE3/9AT reliable?
The price and inventory of SMCG40CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG40CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG40CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG40CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG40CAHE3/9AT?
SMCG40CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG40CAHE3/9AT 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 SMCG40CAHE3/9AT?
For technical support, including SMCG40CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG40CAHE3/9AT requirements.
6.How does Aetrix verify that SMCG40CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG40CAHE3/9AT 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 SMCG40CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG40CAHE3/9AT?
All SMCG40CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG40CAHE3/9AT, 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 SMCG40CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCG40CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG40CAHE3/9AT Tags
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