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Vishay General Semiconductor - Diodes Division SMCG8.5A-M3/9AT
- Part No.:
- SMCG8.5A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG8.5A-M3/9AT.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,052
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Product details
Overview
SMCG8.5A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor in the SMCG (DO-215AB) package, with 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V clamping voltage (VC) at 20 A peak pulse current, and 1500 W peak pulse power rating. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD in automotive and industrial power electronics.
For engineers reviewing the SMCG8.5A-M3/9AT datasheet, SMCG8.5A-M3/9AT pinout, SMCG8.5A-M3/9AT application, or SMCG8.5A-M3/9AT equivalent, key selection criteria include clamping performance under 10/1000 µs surge, AEC-Q101 qualification for automotive use, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on standard 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a unidirectional avalanche diode, leveraging glass-passivated silicon junction technology to achieve sub-nanosecond response time and low incremental surge resistance. Its clamping behavior is defined by a 10/1000 µs waveform test condition, with thermal derating above 25 °C per Fig. 2 and maximum junction temperature of 150 °C.
The SMCG8.5A-M3/9AT uses a DO-215AB gull-wing surface-mount package with matte tin-plated leads, rated MSL Level 1 (260 °C peak reflow), and meets JESD201 Class 2 whisker resistance. Polarity is marked by a cathode band; no marking applies to bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 9.44 V / 10.4 V at 1 mA - Ensures reliable avalanche initiation within tight tolerance |
| VC @ IPPM | 14.4 V at 20 A - Limits downstream voltage stress during 10/1000 µs surge events |
| PPPM | 1500 W - Sustains high-energy transients without failure under standardized waveform |
| ID @ VWM | 1.0 µA - Ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - Enables operation in under-hood automotive and industrial ambient environments |
| RθJA | 75 °C/W - Requires minimum 8.0 mm × 8.0 mm copper pad per terminal for thermal management |
Pinout & Package
Package: SMCG (DO-215AB), surface-mount gull-wing, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path (cathode-banded side) | Connected to ground or low-side reference in unidirectional TVS configuration |
| Cathode | Avalanche clamping node (marked with band) | Connected to protected line; conducts surge current to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass-passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress |
| Low profile DO-215AB | Enables high-density PCB layouts and compatibility with automated pick-and-place equipment |
| 1500 W peak pulse power | Provides robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges |
| Halogen-free (M3 suffix) | Meets environmental compliance requirements for industrial and automotive supply chains |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges above 14.4 V. Use Value: Prevents damage to MCU power inputs and CAN transceivers during ISO 16750-2 load-dump events up to 35 V. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in PLC modules. IC Role / Device Role / Timing Role: Clamping transient spikes on 4–20 mA or 0–10 V output lines induced by relay switching. Use Value: Maintains signal fidelity and prevents ADC saturation or op-amp latch-up during 1 kV/500 A surge events. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeds |
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters after rectification. IC Role / Device Role / Timing Role: Standoff-rated TVS across DC bus to absorb flyback spikes from synchronous rectifiers. Use Value: Limits voltage excursions to ≤14.4 V, protecting GaN FET gate drivers and secondary-side controllers. | Use Scenario: Surge protection on -48 V telecom power feeds entering base station control boards. IC Role / Device Role / Timing Role: Unidirectional clamping device referenced to system ground, absorbing positive-going transients. Use Value: Withstands repeated 10/1000 µs surges up to 1500 W while maintaining <1 µA leakage at -48 V bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A-M3/867 | Same VWM/VBR/VC specs but in SMA (DO-214AC) package; RθJA = 85 °C/W vs. 75 °C/W | Lower power density; less effective on high-repetition surges without enhanced heatsinking | Prefer SMCG8.5A-M3/9AT where board space allows DO-215AB and higher thermal performance is needed |
| SMCJ8.5A-M3/867 | Same package (DO-214AB), but 1500 W rating achieved at higher VC = 15.0 V; VBR tighter (9.44–10.0 V) | Higher clamping voltage increases stress on protected ICs; requires margin verification | Choose SMCG8.5A-M3/9AT when lower VC (14.4 V) is critical for sensitive 3.3 V or 5 V logic interfaces |
Compared with SMAJ8.5A-M3/867 and SMCJ8.5A-M3/867, the SMCG8.5A-M3/9AT delivers superior thermal resistance (75 vs. 85/78 °C/W) and lower clamping voltage (14.4 V), making it preferred for space-constrained automotive and industrial designs requiring tighter voltage limiting and repeatable surge endurance.
Availability
SMCG8.5A-M3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, and telecom DC feed applications requiring stable component supply, AEC-Q101 qualification, and halogen-free compliance.
Supply support for SMCG8.5A-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, and transient protection devices with emphasis on reliability, automotive qualification, and industrial robustness.
The SMCG series was designed specifically for high-power, surface-mount transient suppression in harsh environments-targeting automotive subsystems, industrial controls, and infrastructure power systems where AEC-Q101 compliance and 1500 W surge handling are mandatory.
FAQ
What is the clamping voltage of SMCG8.5A-M3/9AT and how is it measured?
The SMCG8.5A-M3/9AT has a maximum clamping voltage (VC) of 14.4 V, measured at 20 A peak pulse current using a standardized 10/1000 µs waveform per IEC 61000-4-5. This value reflects the actual voltage seen by downstream circuitry during surge events and is guaranteed across temperature and production lot. The SMCG8.5A-M3/9AT maintains this clamping performance with minimal variation due to its glass-passivated junction and controlled avalanche characteristics.
Is SMCG8.5A-M3/9AT qualified for automotive applications?
Yes, the SMCG8.5A-M3/9AT is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias, temperature cycling, and ESD per JESD22-A114. Its M3 suffix confirms halogen-free, RoHS-compliant construction meeting automotive supply chain requirements. The SMCG8.5A-M3/9AT is routinely deployed in engine control units, body electronics, and ADAS power domains where transient immunity and long-term reliability are critical.
What does the "M3" suffix mean in SMCG8.5A-M3/9AT?
The "M3" suffix in SMCG8.5A-M3/9AT indicates halogen-free, RoHS-compliant construction with matte tin-plated leads that meet JESD201 Class 2 whisker resistance. It also signifies industrial-grade qualification and compliance with Vishay's material categorization standard (doc# 99912). Unlike "E3", M3 ensures full halogen-free content without compromising solderability or thermal cycling performance. The SMCG8.5A-M3/9AT is certified for lead-free reflow up to 260 °C peak per J-STD-020.
How does SMCG8.5A-M3/9AT differ from bidirectional versions like SMCG8.5CA?
The SMCG8.5A-M3/9AT is unidirectional, with polarity marked by a cathode band and intended for DC line-to-ground protection. In contrast, SMCG8.5CA is bidirectional, lacks polarity marking, and clamps symmetrically in both directions-suitable for AC lines or differential data buses. The SMCG8.5A-M3/9AT offers lower leakage (<1 µA at 8.5 V) and supports forward surge current (IFSM = 200 A), which SMCG8.5CA does not specify. Their VBR and VC values differ slightly due to internal structure asymmetry.
What PCB layout guidance applies to SMCG8.5A-M3/9AT for optimal thermal performance?
For optimal thermal performance, SMCG8.5A-M3/9AT must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in the datasheet. Thermal vias under pads are recommended to enhance heat transfer to inner layers. Trace width should exceed 1.5 mm to minimize inductance during surge conduction. The SMCG8.5A-M3/9AT achieves RθJA = 75 °C/W only with this layout; reduced copper area raises junction temperature and de-rates PPPM significantly.
SMCG8.5A-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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 104.2A
- 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)
SMCG8.5A-M3/9AT FAQ
1.How can I place an order for SMCG8.5A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG8.5A-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 SMCG8.5A-M3/9AT reliable?
The price and inventory of SMCG8.5A-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 SMCG8.5A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG8.5A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG8.5A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG8.5A-M3/9AT?
SMCG8.5A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG8.5A-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 SMCG8.5A-M3/9AT?
For technical support, including SMCG8.5A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG8.5A-M3/9AT requirements.
6.How does Aetrix verify that SMCG8.5A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG8.5A-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 SMCG8.5A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG8.5A-M3/9AT?
All SMCG8.5A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG8.5A-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 SMCG8.5A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG8.5A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG8.5A-M3/9AT Tags
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