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Vishay General Semiconductor - Diodes Division SMCG51A-E3/9AT
- Part No.:
- SMCG51A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG51A-E3/9AT.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,817
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Product details
Overview
SMCG51A-E3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) surface-mount 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), 18.2 A peak pulse current (IPPM), and clamps to ≤82.4 V at rated surge. It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power systems.
For engineers reviewing the SMCG51A-E3/9AT datasheet, SMCG51A-E3/9AT pinout, SMCG51A-E3/9AT application, or SMCG51A-E3/9AT equivalent, this page delivers verified electrical parameters, polarity marking, thermal resistance (RθJA = 75 °C/W), RoHS-compliant matte tin plating, and MSL Level 1 reflow compatibility - all critical for automotive-grade ESD/surge design validation and BOM selection.
Technical Context
The SMCG51A-E3/9AT operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1 ns) to transients induced by inductive load switching or lightning surges. Its DO-215AB package supports automated placement and meets UL 94 V-0 flammability rating, with cathode band marking for polarity identification.
It delivers 1500 W peak pulse power under standardized 10/1000 µs waveform conditions, with clamping voltage ≤82.4 V at 18.2 A IPPM and low incremental surge resistance. Thermal performance is characterized by RθJA = 75 °C/W (on 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, supporting reliable operation up to TJ = +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin |
| VBR (min/max) | 56.7 V / 62.7 V at IT = 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on under surge |
| VC @ IPPM | ≤82.4 V at 18.2 A - clamping voltage during 10/1000 µs surge; determines protected circuit's maximum stress level |
| PPPM | 1500 W - peak transient energy handling capacity; enables protection against IEC 61000-4-5 Level 4 surges |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard 8 mm × 8 mm pads; informs heatsinking requirements |
| Polarity | Unidirectional - cathode marked by band; requires correct orientation in series with protected line |
| AEC-Q101 | Qualified - validated for automotive underhood and body electronics per stress test requirements |
Pinout & Package
Package: SMCG (DO-215AB) - low-profile, surface-mount plastic case with matte tin-plated leads, UL 94 V-0 rated molding compound, and MSL Level 1 moisture sensitivity (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected line ground or low-side reference | Must be tied to lower potential side of protected node; incorrect connection disables clamping |
| Cathode | Current exit terminal in forward bias; marked by band on package body | Connected to protected signal/power line; absorbs surge current into ground path during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress |
| AEC-Q101 qualification | Validates suitability for automotive applications including engine control, ADAS sensors, and infotainment power rails |
| MSL Level 1 rating | Permits unlimited floor life and standard reflow without baking; simplifies SMT manufacturing flow |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for downstream ICs |
| UL 94 V-0 molding compound | Meets flame-retardancy requirements for enclosed automotive and industrial enclosures |
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 chassis ground to clamp surges above 51 V. Use Value: Limits peak voltage to ≤82.4 V during 1500 W surges, preventing damage to 60 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: TVS mounted at connector interface to absorb ESD and inductive kickback from solenoid actuation. Use Value: Responds in <1 ns to 8 kV contact ESD (IEC 61000-4-2), maintaining signal integrity below 51 V stand-off threshold. |
| Telecom Power Input Stage | Consumer Device USB Power Rail |
|
Use Scenario: Safeguarding PoE-powered switch ports against lightning-induced surges on Ethernet lines. IC Role / Device Role / Timing Role: Primary clamping device on 48 V DC input, coordinated with upstream gas discharge tube (GDT). Use Value: Handles 10/1000 µs surges up to 18.2 A while maintaining clamping below 82.4 V, preserving IEEE 802.3af compliance. |
Use Scenario: Overvoltage protection on 5 V USB VBUS line in portable speakers and docking stations. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between VBUS and ground to block >51 V faults from adapters or hot-plug events. Use Value: Withstands 200 A IFSM (8.3 ms half-sine), surviving accidental 12 V adapter misconnection without failure. |
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) and smaller SMA package (DO-214AC) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 or automotive load dump | Select when board space is constrained and surge energy is ≤400 W; verify thermal derating on small pads |
| SMCJ51A-E3/9AT | Same VWM (51 V) and DO-215AB package, but higher PPPM (1500 W) and identical clamping (≤82.4 V); differs only in JEDEC prefix (SMCJ vs SMCG) | Functionally interchangeable in all circuits; both AEC-Q101 qualified and RoHS compliant | Preferred for new designs requiring full 1500 W capability with identical footprint and thermal behavior |
Compared with SMAJ51A-E3/57T, SMCG51A-E3/9AT delivers 3.75× higher surge power handling in the same mounting area, while SMCJ51A-E3/9AT offers identical electrical and mechanical performance - making it a direct functional match where legacy SMCJ sourcing is preferred.
Availability
SMCG51A-E3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom PoE inputs, and consumer USB power rail protection requiring stable component supply across high-volume production cycles.
Supply support for SMCG51A-E3/9AT 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, TVS devices, and optoelectronics with emphasis on reliability, AEC-Q qualification, and high-power handling.
The SMCG series was developed specifically for high-energy transient suppression in automotive and industrial environments, combining AEC-Q101 validation, DO-215AB ruggedness, and 1500 W surge capability in a surface-mount format.
FAQ
What is the clamping voltage of SMCG51A-E3/9AT at its rated peak pulse current?
The SMCG51A-E3/9AT clamps to a maximum of 82.4 V at its rated peak pulse current (IPPM) of 18.2 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping performance is guaranteed across the full operating temperature range and forms the basis for selecting downstream IC voltage ratings.
Is SMCG51A-E3/9AT suitable for automotive applications?
Yes, SMCG51A-E3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including underhood and body electronics subject to load dump, jump-start, and ISO 7637-2 transients. Its DO-215AB package, MSL Level 1 reflow compatibility, and guaranteed 1500 W surge handling make it appropriate for ECUs, ADAS camera modules, and infotainment power supplies where reliability under harsh conditions is mandatory.
What does the "E3/9AT" suffix indicate in SMCG51A-E3/9AT?
The "E3" suffix denotes RoHS-compliant, industrial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD 22-B102 whisker resistance Class 2. The "9AT" indicates packaging in 13-inch diameter plastic tape and reel, with a base quantity of 3500 units - optimized for high-volume SMT assembly lines requiring extended reel life and automated feeder compatibility.
How does SMCG51A-E3/9AT differ from bidirectional variants like SMCG51CA?
SMCG51A-E3/9AT is unidirectional with cathode band marking and conducts only in reverse breakdown, while SMCG51CA is bidirectional with symmetrical clamping in both polarities and no polarity marking. The unidirectional version provides lower leakage at VWM (1.0 µA vs. 1000 µA for CA types at 51 V), making it preferable for DC power rail protection where reverse leakage must be minimized.
What is the thermal resistance of SMCG51A-E3/9AT, and how does it affect layout?
SMCG51A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay spec; reducing pad size increases RθJA and risks thermal runaway during repetitive surges. Layout must allocate sufficient copper area and avoid thermal isolation to maintain safe TJ ≤ 150 °C.
SMCG51A-E3/9AT 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-E3/9AT FAQ
1.How can I place an order for SMCG51A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG51A-E3/9AT 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-E3/9AT reliable?
The price and inventory of SMCG51A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG51A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG51A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG51A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG51A-E3/9AT?
SMCG51A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG51A-E3/9AT 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-E3/9AT?
For technical support, including SMCG51A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG51A-E3/9AT requirements.
6.How does Aetrix verify that SMCG51A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG51A-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG51A-E3/9AT?
All SMCG51A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG51A-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG51A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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