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Vishay General Semiconductor - Diodes Division SMCG51A-M3/9AT
- Part No.:
- SMCG51A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG51A-M3/9AT.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,703
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Product details
Overview
SMCG51A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V stand-off voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), 82.4 V clamping voltage at 18.2 A IPPM, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMCG51A-M3/9AT datasheet, SMCG51A-M3/9AT pinout, SMCG51A-M3/9AT application, or SMCG51A-M3/9AT equivalent, this device is selected for high-energy transient suppression in automotive power rails, industrial sensor interfaces, and DC-DC converter input stages where low clamping voltage, fast response (<1 ns), and halogen-free RoHS compliance are critical.
Technical Context
The SMCG51A-M3/9AT operates as a unidirectional avalanche diode with glass-passivated junction, delivering precise voltage clamping during ESD, lightning-induced surges, or inductive switching transients. Its 1500 W PPPM rating is validated on 8.0 mm × 8.0 mm copper pads per terminal, and thermal resistance is characterized at RθJA = 75 °C/W and RθJL = 15 °C/W.
It supports surge currents up to 200 A (8.3 ms half-sine, IFSM), maintains ≤1.0 µA reverse leakage at VWM, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Polarity is marked by a cathode band; no marking applies to bidirectional variants - this part is unidirectional only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 48 V nominal systems. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - Tight breakdown tolerance ensures predictable turn-on across temperature and production lot. |
| VC @ IPPM | 82.4 V at 18.2 A - Clamping voltage under 10/1000 µs surge; determines maximum stress imposed on protected downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling capability; enables protection against high-energy transients per ISO 7637-2 Pulse 5a. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| Package | SMCG (DO-215AB) - Low-profile SMD outline with gull-wing leads; optimized for automated placement and high thermal dissipation via PCB copper pads. |
| Compliance | AEC-Q101 qualified, halogen-free, RoHS compliant - Meets automotive reliability and environmental requirements without trade-offs in surge performance. |
Pinout & Package
SMCG51A-M3/9AT uses the SMCG (DO-215AB) surface-mount package: gull-wing leaded, 2-terminal configuration with cathode band marking. The case is molded compound rated UL 94 V-0; terminals are matte tin plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; connected to system ground or low-side reference in unidirectional TVS configuration. | Provides return path for surge current; must be routed to low-impedance ground plane to minimize clamping overshoot. |
| Cathode | Marked terminal (band); reverse-biased connection point to protected line (e.g., 48 V rail, CAN-H, sensor supply). | Defines polarity-sensitive placement - incorrect orientation disables protection and may cause catastrophic failure under surge. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature; eliminates risk of junction degradation under repeated surge stress. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD >15 kV), improving protection margin for sub-100 V logic and analog ICs. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS power domains requiring zero field failures. |
| Halogen-free & RoHS-compliant (M3 suffix) | Meets global environmental regulations without compromising thermal or electrical performance; compatible with lead-free reflow profiles. |
| MSL Level 1 rating | Enables unlimited floor life and standard 260 °C reflow without baking; reduces manufacturing overhead and moisture-related defects. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground, clamping surges within nanoseconds. Use Value: Limits voltage seen by downstream DC-DC converters and microcontrollers to ≤82.4 V, preventing latch-up or gate oxide damage. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules. IC Role / Device Role / Timing Role: Point-of-entry protection on signal lines exposed to relay coil switching noise and cable discharge events. Use Value: Maintains signal integrity by suppressing transients up to 1500 W while adding <0.5 pF capacitance at 0 V bias - no bandwidth degradation. |
| DC-DC Converter Input Stage | Telecom Power Supply Surge Protection |
Use Scenario: Input protection for isolated 48 V-to-12 V buck converters in telecom base station power supplies. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input filter and controller IC. Use Value: Absorbs repetitive 10/1000 µs surges without derating, enabling reliable operation in harsh electromagnetic environments. |
Use Scenario: Secondary-side protection on -48 V telecom distribution boards subject to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; this unidirectional part used on negative rail with cathode grounded. Use Value: Provides 1500 W surge immunity with 1.0 µA leakage at -48 V, minimizing standby power loss in always-on infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-E3/57T | Same VWM (51 V) and VC (82.4 V), but lower PPPM (400 W); SMA (DO-214AC) package with higher RθJA (100 °C/W). | Not suitable for automotive load dump; limited to low-energy ESD and inductive spikes in consumer-grade designs. | Select when cost sensitivity outweighs surge energy requirements and board space allows larger footprint. |
| SMCJ51A-M3/9AT | Identical VWM, VBR, VC, and PPPM (1500 W), but in SMC (DO-214AB) package - 2.5× larger footprint and 20% higher RθJA (90 °C/W). | Compatible for same surge levels but requires more PCB area and exhibits higher thermal rise under sustained pulse trains. | Choose only if legacy SMC layout exists; SMCG offers superior power density and thermal performance for new designs. |
Compared with SMAJ51A-E3/57T and SMCJ51A-M3/9AT, the SMCG51A-M3/9AT delivers identical electrical protection with 30% lower thermal resistance and 40% smaller footprint - making it optimal for space-constrained, thermally demanding automotive and industrial applications.
Availability
SMCG51A-M3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, and telecom power supplies requiring stable component supply, AEC-Q101 compliance, and high-reliability transient suppression.
Supply support for SMCG51A-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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMCG series was engineered specifically for high-energy, space-constrained transient suppression in next-generation automotive and industrial power systems - prioritizing low clamping, AEC-Q101 validation, and halogen-free manufacturability.
FAQ
What is the clamping voltage of the SMCG51A-M3/9AT under a 10/1000 µs surge?
The SMCG51A-M3/9AT has a maximum clamping voltage (VC) of 82.4 V at 18.2 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCG51A-M3/9AT maintains this clamping performance across its full operating temperature range.
Is the SMCG51A-M3/9AT suitable for automotive applications?
Yes, the SMCG51A-M3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments with junction temperatures up to +150 °C. Its glass-passivated junction, MSL Level 1 rating, and halogen-free (M3) construction meet stringent automotive reliability and process requirements. The SMCG51A-M3/9AT is commonly deployed in 48 V battery systems, ADAS power domains, and body control modules.
What does the "M3" suffix indicate in SMCG51A-M3/9AT?
The "M3" suffix denotes halogen-free, RoHS-compliant construction with industrial-grade reliability and JESD 201 Class 2 whisker resistance. It distinguishes the SMCG51A-M3/9AT from the "E3" (RoHS-compliant, non-halogen-free) and "HM3" (AEC-Q101 qualified + halogen-free) variants. All M3 parts meet UL 94 V-0 flammability standards and support lead-free reflow up to 260 °C. The SMCG51A-M3/9AT carries this suffix and is fully traceable to Vishay's certified manufacturing lines.
How does the SMCG51A-M3/9AT compare to the SMAJ51A in terms of surge handling?
The SMCG51A-M3/9AT delivers 1500 W peak pulse power (PPPM), whereas the SMAJ51A is rated for only 400 W - a 275% increase in surge energy absorption. Both share identical VWM (51 V) and VC (82.4 V), but the SMCG51A-M3/9AT achieves this in a smaller DO-215AB package with lower thermal resistance (75 °C/W vs. 100 °C/W). The SMCG51A-M3/9AT is therefore preferred for high-stress applications where the SMAJ51A would fail or degrade prematurely.
What is the reverse leakage current specification for the SMCG51A-M3/9AT at its stand-off voltage?
The SMCG51A-M3/9AT specifies a maximum reverse leakage current (ID) of 1.0 µA at its 51 V stand-off voltage (VWM), measured at TA = 25 °C. This ultra-low leakage ensures minimal power loss in always-on systems such as automotive telematics or industrial IoT sensors. Leakage remains below 5 µA up to +125 °C, preserving battery life and thermal stability. The SMCG51A-M3/9AT maintains this performance across its full qualified temperature range.
SMCG51A-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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 18.2A
- 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)
SMCG51A-M3/9AT FAQ
1.How can I place an order for SMCG51A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG51A-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 SMCG51A-M3/9AT reliable?
The price and inventory of SMCG51A-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 SMCG51A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG51A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG51A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG51A-M3/9AT?
SMCG51A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG51A-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 SMCG51A-M3/9AT?
For technical support, including SMCG51A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG51A-M3/9AT requirements.
6.How does Aetrix verify that SMCG51A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG51A-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 SMCG51A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG51A-M3/9AT?
All SMCG51A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG51A-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 SMCG51A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG51A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG51A-M3/9AT Tags
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