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Vishay General Semiconductor - Diodes Division SMCG51A-E3/57T
- Part No.:
- SMCG51A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG51A-E3/57T.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCG51A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for clamping voltage transients on power and signal lines. 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 for protecting automotive sensor interfaces and industrial I/O circuits.
For engineers reviewing the SMCG51A-E3/57T datasheet, SMCG51A-E3/57T pinout, SMCG51A-E3/57T application, or SMCG51A-E3/57T equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, surge current capability under 10/1000 µs waveform, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, and compatibility with automated SMT placement on standard 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCG51A-E3/57T operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown and low incremental surge resistance. Its clamping behavior follows IEEE C62.35 standards, with fast response time (<1 ns) and bidirectional-capable variants available via CA suffix - though this part is strictly unidirectional, marked with cathode band.
Thermal performance is defined by RθJA = 75 °C/W (on 8.0 mm × 8.0 mm pads) and RθJL = 15 °C/W, enabling reliable operation up to TJ = +150 °C. It meets J-STD-020 MSL Level 1 (260 °C peak reflow) and supports surge immunity per IEC 61000-4-5 (10/1000 µs waveform), with derating applied above TA = 25 °C per Fig. 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for safe DC bias on protected line. |
| VBR (min/max) | 56.7 V / 62.7 V at IT = 1 mA - ensures predictable avalanche onset across production lot; guarantees clamping starts no later than 62.7 V. |
| VC @ IPPM | 82.4 V at 18.2 A - clamped voltage during full-rated 1500 W transient; defines worst-case overvoltage seen by downstream IC. |
| PPPM | 1500 W (10/1000 µs) - peak surge energy handling capacity; validates robustness against lightning-induced or inductive-switching transients. |
| ID @ VWM | 1.0 µA - ultra-low leakage at stand-off voltage; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max. | +150 °C - maximum junction temperature rating; enables use in under-hood automotive and industrial environments without derating. |
| RθJA | 75 °C/W - thermal resistance from junction to ambient on standard 8.0 mm × 8.0 mm pads; determines required board copper area for thermal management. |
Pinout & Package
Package: SMCG (DO-215AB), surface-mount gull-wing lead frame with matte tin-plated terminals, compliant with J-STD-002 and JESD 22-B102 solderability. Cathode identified by molded band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction; connected to ground or low-side reference in unidirectional TVS configuration. | Must be routed to lowest-impedance ground plane to minimize clamping loop inductance and ensure sub-ns response. |
| Cathode | Current exit terminal during reverse-biased clamping; connected to protected line (e.g., CAN_H, LIN, sensor supply). | Marked with visible band; polarity must match PCB silkscreen to prevent catastrophic failure during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature; eliminates parameter drift due to moisture ingress or contamination in harsh environments. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a); improves clamping precision versus silicon carbide alternatives. |
| MSL Level 1 rating | Enables single-pass reflow at 260 °C peak without popcorn cracking or delamination - compatible with standard SMT assembly lines. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulant prevents flame propagation in fault conditions - mandated for safety-critical industrial and transportation systems. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor VOUT and chassis ground to clamp negative-going transients and suppress positive surges up to 1500 W. Use Value: Maintains signal integrity below 82.4 V clamping threshold while surviving repeated 10/1000 µs pulses per ISO 7637-2, extending sensor lifetime in 12 V/24 V vehicle architectures. |
Use Scenario: Safeguarding RS-485 transceiver data lines in programmable logic controllers subjected to EFT bursts and inductive switching noise from solenoid drivers. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted directly at connector entry point to shunt common-mode surges before reaching PHY layer. Use Value: Limits induced voltage to ≤82.4 V during 1 kV/5 kHz EFT events, preventing latch-up or permanent damage to MAX13487 or SN65HVD72 transceivers. |
| Power Supply Rail Clamping | Consumer Device USB Port Protection |
|
Use Scenario: Secondary overvoltage protection on 5 V or 12 V DC-DC converter outputs feeding microcontrollers and memory in factory automation HMIs. IC Role / Device Role / Timing Role: Fast-response TVS placed after bulk capacitance to absorb residual switching spikes and cross-regulation transients. Use Value: Clamps 1500 W surges within 1 ns while maintaining <1 µA leakage at 51 V, eliminating standby current penalty and ensuring clean reset signaling. |
Use Scenario: ESD and surge protection on VBUS and D+/D− lines of USB 2.0 ports in smart home hubs exposed to human-body-model (HBM) discharges and cable-induced transients. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS (cathode to VBUS, anode to GND) and bidirectional variants on data lines - this part used for VBUS only. Use Value: Withstands ±30 kV HBM ESD per IEC 61000-4-2 and clamps 10/1000 µs surges to 82.4 V, preserving USB enumeration and preventing port controller latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient 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 (DO-214AC) package; RθJA = 110 °C/W. | Limited to lower-energy transients (e.g., ESD-only); unsuitable for ISO 7637-2 Pulse 5a load dump. | Select when board space is constrained and surge requirements are ≤400 W; verify thermal margin with higher RθJA. |
| SMCJ51A-E3/57T | Same VWM (51 V) and PPPM (1500 W), but larger SMC (DO-214AB) package; RθJA = 50 °C/W; slightly higher VC (87.1 V). | Better thermal performance allows sustained surge duty cycles; higher VC reduces margin for 5 V-tolerant ICs. | Prefer for high-reliability industrial power rails where thermal headroom matters more than 4.7 V clamping margin. |
Compared with SMAJ51A-E3/57T and SMCJ51A-E3/57T, the SMCG51A-E3/57T delivers identical 1500 W surge rating in a lower-profile DO-215AB package with optimized RθJA (75 °C/W) - striking balance between board height, thermal capability, and clamping precision for automotive and dense industrial PCBs.
Availability
SMCG51A-E3/57T is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and power supply rail clamping requiring stable component supply, AEC-Q101 compliance, and consistent 1500 W transient immunity.
Supply support for SMCG51A-E3/57T 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCG series targets high-energy transient suppression in space-constrained automotive and industrial designs, combining AEC-Q101 qualification, low-profile packaging, and precise clamping for next-generation ECUs and programmable controllers.
FAQ
What is the maximum clamping voltage of the SMCG51A-E3/57T under rated surge conditions?
The SMCG51A-E3/57T clamps to 82.4 V at its rated peak pulse current of 18.2 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and represents the worst-case overvoltage imposed on protected circuitry during full-power transient events. The clamping voltage remains stable across temperature and lifetime due to glass-passivated junction construction in the SMCG51A-E3/57T.
Is the SMCG51A-E3/57T suitable for bidirectional transient suppression?
No - the SMCG51A-E3/57T is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional operation, Vishay offers the SMCG51CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities. Using the SMCG51A-E3/57T in bidirectional applications risks failure during negative transients, as it conducts only in reverse bias.
Does the SMCG51A-E3/57T meet automotive qualification standards?
Yes - the SMCG51A-E3/57T carries AEC-Q101 qualification, verified through stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD. This makes it suitable for automotive applications such as engine control units, body electronics, and ADAS sensor interfaces where reliability under thermal and electrical stress is mandatory. The "HE3" variant adds explicit AEC-Q101 labeling, but SMCG51A-E3/57T is functionally identical and qualified.
What is the thermal resistance of the SMCG51A-E3/57T, and how does it affect layout?
The SMCG51A-E3/57T 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 optimal PCB copper area; reducing pad size increases RθJA and risks exceeding TJ max. of +150 °C during repeated surges. Layout must allocate full 8 mm² per pad and avoid thermal isolation to maintain SMCG51A-E3/57T reliability.
How does the SMCG51A-E3/57T compare to SMAJ51A-E3/57T in surge handling capability?
The SMCG51A-E3/57T delivers 1500 W peak pulse power (10/1000 µs), whereas the SMAJ51A-E3/57T is rated for only 400 W. Both share identical VWM (51 V) and VC (82.4 V), but the SMCG51A-E3/57T's larger DO-215AB package enables higher surge energy absorption and better thermal dissipation. Use SMCG51A-E3/57T for ISO 7637-2-compliant automotive load dump protection; SMAJ51A-E3/57T suffices for ESD-only scenarios.
SMCG51A-E3/57T 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:
- 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-E3/57T FAQ
1.How can I place an order for SMCG51A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG51A-E3/57T 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 SMCG51A-E3/57T reliable?
The price and inventory of SMCG51A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG51A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCG51A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG51A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG51A-E3/57T?
SMCG51A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG51A-E3/57T 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 SMCG51A-E3/57T?
For technical support, including SMCG51A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG51A-E3/57T requirements.
6.How does Aetrix verify that SMCG51A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG51A-E3/57T 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 SMCG51A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCG51A-E3/57T?
All SMCG51A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG51A-E3/57T, 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 SMCG51A-E3/57T part is unused and in its original packaging.
Return procedure for SMCG51A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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