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Vishay General Semiconductor - Diodes Division SMCG85CA-M3/9AT
- Part No.:
- SMCG85CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG85CA-M3/9AT.pdf
- Description:
- TVS DIODE 85VWM 137VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,057
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Product details
Overview
SMCG85CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount TransZORB® transient voltage suppressor (TVS) in the SMCG (DO-215AB) package, rated for 85 V stand-off voltage (VWM), 1500 W peak pulse power (PPPM), and clamping voltage of 137 V at 10.9 A IPPM. It provides robust ESD and surge protection for automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMCG85CA-M3/9AT datasheet, SMCG85CA-M3/9AT pinout, SMCG85CA-M3/9AT application, or SMCG85CA-M3/9AT equivalent, this device is evaluated for bidirectional overvoltage protection in AEC-Q101-compliant automotive subsystems, high-reliability industrial controls, and low-capacitance signal-line safeguarding where MSL Level 1 assembly and halogen-free compliance are required.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities with identical breakdown voltage range (94.4–104 V at 1 mA IT), clamping behavior (VC = 137 V at IPPM), and thermal resistance (RθJA = 75 °C/W). Its glass-passivated junction ensures stable leakage performance (<1.0 μA at VWM) and fast response to transients under 1 ns.
The SMCG85CA-M3/9AT is designed for unclamped operation in circuits exposed to ISO 7637-2 pulse 1/2a/3a and IEC 61000-4-5 surge events. Its DO-215AB package supports automated placement and meets JESD 201 Class 2 whisker resistance, with matte tin-plated leads solderable per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 24 V/48 V automotive and industrial bus systems. |
| VBR min/max | 94.4 V / 104 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above nominal system voltage with margin against false clamping. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 µs waveform; sustains single-event surges up to 137 V clamping at 10.9 A without failure. |
| VC @ IPPM | 137 V - Clamping voltage measured at 10.9 A peak pulse current; limits downstream IC stress during surge events per IEC 61000-4-5 Level 4. |
| ID @ VWM | <1.0 µA - Reverse leakage at 85 V; minimizes standby power loss and avoids signal distortion in high-impedance sensor interfaces. |
| TJ max | +150 °C - Maximum junction temperature rating; enables deployment in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMCG (DO-215AB) - Surface-mount gull-wing package with 8.0 mm × 8.0 mm copper pad footprint; optimized for thermal dissipation and automated SMT assembly. |
Pinout & Package
SMCG85CA-M3/9AT uses the SMCG (DO-215AB) package: a bidirectional two-terminal device with no polarity marking. Terminals are symmetrical and interchangeable; neither anode nor cathode designation applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient Current Path (Bidirectional) | Carries surge current in either direction during clamping; connected to protected line (e.g., CAN_H or LIN bus). |
| Terminal 2 | Transient Current Path (Bidirectional) | Completes low-inductance return path to ground or reference rail; requires short, wide PCB traces for optimal surge suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - suitable for engine control, ADAS sensors, and body electronics. |
| Halogen-free & RoHS compliant (M3 suffix) | Meets IEC 61249-2-21 and JEDEC J-STD-20 requirements; eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating. |
| MSL Level 1 (260 °C peak) | Enables standard reflow profiles without moisture sensitivity concerns; no baking required prior to assembly. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., inductive switch-off), improving clamping precision and downstream component safety. |
| Glass-passivated junction | Provides stable electrical characteristics over lifetime and environmental stress, reducing parameter drift in humid or thermally cycled applications. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤137 V while maintaining <1.0 µA leakage, preserving signal integrity and preventing ADC saturation or latch-up. |
Use Scenario: Safeguarding RS-485 transceiver data lines in factory automation PLCs subjected to EFT and surge events. IC Role / Device Role / Timing Role: Line-side TVS connected across differential pair (A/B) to shunt common-mode surges. Use Value: Withstands 1500 W pulses without degradation, enabling compliance with IEC 61000-4-4/5 Level 4 while adding negligible capacitance to high-speed buses. |
| Automotive LIN Bus | Power Supply Rail Clamp |
Use Scenario: Overvoltage protection on LIN bus master/slave nodes in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Bidirectional TVS placed between LIN line and ground to clamp negative and positive transients equally. Use Value: Symmetric VBR (94.4–104 V) and VC (137 V) ensure balanced protection during battery reversal or load dump, meeting LIN physical layer robustness requirements. |
Use Scenario: Secondary clamping on 12 V/24 V supply rails feeding infotainment head units and telematics gateways. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing residual energy after primary DC-DC converter overvoltage protection. Use Value: 1500 W PPPM rating handles sustained surges exceeding primary protection capability, extending system-level surge immunity beyond ISO 16750-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CA | Same VWM (85 V) and PPPM (1500 W), but in SMA (DO-214AC) package; RθJA = 85 °C/W vs. 75 °C/W for SMCG85CA-M3/9AT. | Larger footprint (4.5 mm × 2.7 mm vs. 7.87 mm × 9.64 mm); lower thermal efficiency limits sustained surge duty cycle. | Select SMAJ85CA only when board space constraints prohibit DO-215AB; verify thermal derating per Fig. 2 in high-ambient environments. |
| SMCJ85CA | Higher PPPM (3000 W), same VWM (85 V), same DO-214AB package outline but larger body; RθJA = 60 °C/W. | Physically incompatible - requires revised pad layout and stencil; not drop-in replaceable due to dimensional mismatch. | Choose SMCJ85CA only when system-level surge testing exceeds 1500 W requirements; redesign PCB pads and verify mechanical clearance. |
Compared with SMAJ85CA and SMCJ85CA, the SMCG85CA-M3/9AT delivers superior thermal performance in its native DO-215AB footprint, making it optimal for space-constrained yet thermally demanding automotive and industrial applications where 1500 W surge handling must be sustained without layout change.
Availability
SMCG85CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and LIN bus safeguarding requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for SMCG85CA-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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, power handling, and automotive qualification.
The SMCG series targets high-energy transient suppression in harsh environments; engineered specifically for AEC-Q101 compliance, low-profile SMT assembly, and consistent clamping performance across temperature and lifetime.
FAQ
What is the clamping voltage of SMCG85CA-M3/9AT and how is it measured?
The SMCG85CA-M3/9AT has a maximum clamping voltage (VC) of 137 V, measured at a peak pulse current (IPPM) of 10.9 A using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed per the Vishay datasheet (Document Number: 88457, Rev. 09-Jan-2024) and reflects worst-case voltage seen by downstream circuitry during surge events. The SMCG85CA-M3/9AT maintains this clamping performance across its full operating temperature range.
Is SMCG85CA-M3/9AT suitable for automotive applications?
Yes - the SMCG85CA-M3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and sensor modules. Its halogen-free (M3) construction, MSL Level 1 rating, and guaranteed performance from –55 °C to +150 °C junction temperature make it appropriate for under-hood and cabin-mounted systems. The SMCG85CA-M3/9AT meets ISO 7637-2 and IEC 61000-4-5 surge immunity requirements when applied per recommended layout guidelines.
Does SMCG85CA-M3/9AT have polarity markings?
No - the SMCG85CA-M3/9AT is a bidirectional TVS diode and carries no polarity marking on the package. Its DO-215AB case is symmetrical, with identical electrical behavior in both directions. Unlike unidirectional variants (e.g., SMCG85A), the "CA" suffix denotes bidirectional functionality, and the device may be mounted in either orientation without affecting performance. This simplifies layout and reduces assembly errors in SMCG85CA-M3/9AT implementations.
What is the thermal resistance of SMCG85CA-M3/9AT and why does it matter?
The SMCG85CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per the datasheet. This value directly impacts how much surge energy the device can absorb repeatedly without exceeding its 150 °C maximum junction temperature. Lower RθJA enables higher duty-cycle surge handling - critical in automotive and industrial applications where multiple transients may occur in rapid succession. Proper pad design is essential to achieve the SMCG85CA-M3/9AT's rated thermal performance.
How does the M3 suffix affect SMCG85CA-M3/9AT compliance and processing?
The "M3" suffix on SMCG85CA-M3/9AT indicates halogen-free, RoHS-compliant construction meeting JEDEC J-STD-20 and IEC 61249-2-21 standards, with matte tin-plated leads qualified per JESD 201 Class 2 for whisker resistance. It also specifies compatibility with standard Pb-free reflow profiles (peak 260 °C, MSL Level 1), eliminating pre-bake requirements. These attributes make the SMCG85CA-M3/9AT suitable for global automotive and industrial manufacturing without process modification.
SMCG85CA-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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 10.9A
- 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)
SMCG85CA-M3/9AT FAQ
1.How can I place an order for SMCG85CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG85CA-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 SMCG85CA-M3/9AT reliable?
The price and inventory of SMCG85CA-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 SMCG85CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG85CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG85CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG85CA-M3/9AT?
SMCG85CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG85CA-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 SMCG85CA-M3/9AT?
For technical support, including SMCG85CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG85CA-M3/9AT requirements.
6.How does Aetrix verify that SMCG85CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG85CA-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 SMCG85CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG85CA-M3/9AT?
All SMCG85CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG85CA-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 SMCG85CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG85CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG85CA-M3/9AT Tags
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