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Vishay General Semiconductor - Diodes Division SMCG85CA-M3/57T
- Part No.:
- SMCG85CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG85CA-M3/57T.pdf
- Description:
- TVS DIODE 85VWM 137VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,356
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Product details
Overview
SMCG85CA-M3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection of signal and power lines. It features a 85 V stand-off voltage (VWM), 137 V maximum clamping voltage (VC) at 10.9 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (PPPM) under 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMCG85CA-M3/57T datasheet, SMCG85CA-M3/57T pinout, SMCG85CA-M3/57T application, or SMCG85CA-M3/57T equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), and DO-215AB thermal performance with RθJA = 75 °C/W on standard 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a bidirectional avalanche diode, leveraging glass-passivated junction technology to deliver symmetrical breakdown behavior in both polarities - critical for AC-coupled or floating signal paths. Its clamping response is optimized for fast transients (sub-nanosecond intrinsic response), with low incremental surge resistance ensuring minimal voltage overshoot during 10/1000 µs surges.
The SMCG85CA-M3/57T is rated for TJ = –55 °C to +150 °C operation and meets JESD201 Class 2 whisker resistance. Its M3 suffix confirms halogen-free, RoHS-compliant construction and industrial-grade reliability - distinct from HE3/HM3 variants qualified to AEC-Q101 (which this part is not, per document 88457 Table "Mechanical Data" base P/N mapping).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping initiates; defines safe working range for protected circuitry. |
| VBR (min/max) | 94.4 V / 104 V - breakdown voltage range at 1 mA test current; ensures predictable turn-on across production lot. |
| VC @ IPPM | 137 V at 10.9 A - clamped voltage during 10/1000 µs surge; directly limits stress on downstream ICs like CAN transceivers or ADC front-ends. |
| PPPM | 1500 W - peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly mounted. |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on 8.0 mm × 8.0 mm copper pads; enables thermal design margin estimation for sustained surge duty cycles. |
| TJ max | +150 °C - maximum junction temperature; allows operation in under-hood automotive environments without derating below 125 °C ambient. |
Pinout & Package
Package: SMCG (DO-215AB) - surface-mount, low-profile gull-wing leaded case with matte tin-plated terminals solderable per J-STD-002 and JESD22-B102. Bidirectional polarity: no marking on device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | One terminal of symmetrical avalanche junction; conducts during positive overvoltage events relative to cathode reference. |
| Cathode | Transient current entry (negative half-cycle) | Second terminal of symmetrical junction; conducts during negative overvoltage events - functionally identical to anode in bidirectional mode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification status | Not applicable - SMCG85CA-M3/57T uses M3 suffix (halogen-free, RoHS, industrial grade); AEC-Q101 applies only to HM3/HE3 variants per mechanical data table. |
| Clamping symmetry | Bidirectional VBR matching (±5% tolerance) ensures equal protection for AC signals and differential buses without polarity biasing. |
| Surge robustness | 1500 W PPPM rating supports repeated 10/1000 µs surges up to 10.9 A without degradation when mounted per recommended 8.0 mm × 8.0 mm pad layout. |
| Process reliability | Glass passivated chip junction prevents moisture ingress and electromigration, enabling >1000 hours HAST reliability at 130 °C/85% RH. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN/CAN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between connector and transceiver input pins to shunt surge energy before it reaches sensitive silicon. Use Value: Limits transient voltage to ≤137 V during 10/1000 µs surges, preventing latch-up or gate oxide damage in 5 V or 12 V interface ICs. | Use Scenario: Safeguarding PLC digital input channels against field-wiring induced transients from relay coils or motor drives. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input lines, positioned upstream of optocoupler or Schmitt-trigger input stages. Use Value: Withstands 1500 W surges while maintaining <1 µA leakage at 85 V, preserving input threshold accuracy and reducing false triggering. |
| Telecom Line Interface | Consumer USB/Display Port ESD Guard |
Use Scenario: Shielding RS-485/RS-422 differential pairs in base station backhaul equipment from lightning-induced surges. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground, providing balanced clamping without skewing differential signaling. Use Value: Symmetrical 94.4–104 V VBR ensures matched turn-on timing on both lines, minimizing common-mode to differential-mode conversion during transients. | Use Scenario: Secondary-level ESD protection on HDMI or USB 3.x high-speed lanes in set-top boxes and monitors. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical at 0 V) bidirectional clamp placed after primary ESD array to handle residual surges. Use Value: Clamps 8 kV contact ESD events to <137 V within <1 ns, preventing bit errors or link resets without degrading 5 Gbps signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CA | Same VWM (85 V) and VC (137 V), but SMA (DO-214AC) package; RθJA = 85 °C/W vs. 75 °C/W; lower PPPM (400 W). | Lower power handling limits use to sub-400 W surge environments; less suitable for IEC 61000-4-5 Level 4. | Select SMAJ85CA only if board space constraints favor SMA footprint and surge requirements are ≤400 W. |
| SMCJ85CA | Same DO-214AB package family but larger body; higher PPPM (1500 W), identical VWM/VC, but RθJA = 60 °C/W and heavier thermal mass. | Better thermal performance allows longer surge duration tolerance; requires larger PCB pad area (10.0 mm × 10.0 mm vs. 8.0 mm × 8.0 mm). | Choose SMCJ85CA when extended surge duty cycle or tighter thermal margins are required, accepting larger footprint. |
Compared with SMAJ85CA and SMCJ85CA, the SMCG85CA-M3/57T delivers identical 1500 W surge capability in a smaller DO-215AB outline with optimized 75 °C/W thermal resistance - making it ideal for space-constrained automotive and industrial modules where 8.0 mm × 8.0 mm mounting is standardized.
Availability
SMCG85CA-M3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, and telecom line protection requiring stable component supply and halogen-free RoHS compliance.
Supply support for SMCG85CA-M3/57T 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, thermal performance, and automotive-grade qualification.
The SMCG series targets high-power transient suppression in compact surface-mount formats, specifically engineered for AEC-Q101-qualified and industrial-grade applications where DO-215AB's thermal efficiency and gull-wing manufacturability are critical.
FAQ
What is the clamping voltage of SMCG85CA-M3/57T under a 10/1000 µs surge?
The SMCG85CA-M3/57T clamps to a maximum of 137 V at 10.9 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per Figure 3 in Vishay document 88457 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMCG85CA-M3/57T AEC-Q101 qualified?
No, SMCG85CA-M3/57T is not AEC-Q101 qualified. Per Vishay's mechanical data table in document 88457, only base P/Ns with HE3 or HM3 suffixes (e.g., SMCG85CAHE3/57T) carry AEC-Q101 qualification. The M3 suffix denotes halogen-free, RoHS-compliant, industrial-grade construction - suitable for non-automotive or non-safety-critical automotive subsystems.
What does the "M3" suffix mean in SMCG85CA-M3/57T?
The "M3" suffix in SMCG85CA-M3/57T indicates halogen-free, RoHS-compliant, industrial-grade construction per Vishay's ordering nomenclature. It specifies matte tin-plated leads, JESD201 Class 2 whisker resistance, and compliance with UL 94 V-0 molding compound - distinct from HE3/HM3 (AEC-Q101) or E3 (standard RoHS) variants.
What is the thermal resistance of SMCG85CA-M3/57T, and how is it measured?
The SMCG85CA-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W, measured on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal as specified in Vishay document 88457. This value enables accurate junction temperature estimation during surge events and informs PCB layout decisions for thermal management.
Can SMCG85CA-M3/57T be used in bidirectional signal lines such as RS-485?
Yes, SMCG85CA-M3/57T is explicitly designed for bidirectional applications, as indicated by the "CA" suffix. Its symmetrical breakdown (VBR min/max = 94.4 V / 104 V in both directions) and matched clamping ensure balanced protection on differential or AC-coupled lines like RS-485, preventing signal distortion or common-mode noise injection during transients.
SMCG85CA-M3/57T 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-M3/57T FAQ
1.How can I place an order for SMCG85CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG85CA-M3/57T 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-M3/57T reliable?
The price and inventory of SMCG85CA-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG85CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCG85CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG85CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG85CA-M3/57T?
SMCG85CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG85CA-M3/57T 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-M3/57T?
For technical support, including SMCG85CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG85CA-M3/57T requirements.
6.How does Aetrix verify that SMCG85CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG85CA-M3/57T 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-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCG85CA-M3/57T?
All SMCG85CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG85CA-M3/57T, 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-M3/57T part is unused and in its original packaging.
Return procedure for SMCG85CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG85CA-M3/57T Tags
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