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Vishay General Semiconductor - Diodes Division SMCG51CA-E3/57T
- Part No.:
- SMCG51CA-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG51CA-E3/57T.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,255
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Product details
Overview
SMCG51CA-E3/57T from Vishay General Semiconductor is a bidirectional Transient Voltage Suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection on signal and power lines. It features a 51 V standoff voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (PPPM), clamping voltage of 82.4 V at 18.2 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMCG51CA-E3/57T datasheet, SMCG51CA-E3/57T pinout, SMCG51CA-E3/57T application, or SMCG51CA-E3/57T equivalent, this device is selected for high-energy transient suppression in automotive sensor interfaces, industrial I/O ports, and telecom line protection where bidirectional clamping, low clamping ratio, and MSL Level 1 reflow compatibility are critical.
Technical Context
The SMCG51CA-E3/57T operates as a silicon avalanche diode with symmetrical bidirectional conduction, enabling clamping in both polarities without polarity marking. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while its low incremental surge resistance supports fast response to 10/1000 µs transients.
Thermally, it delivers 6.5 W power dissipation at TA = 50 °C with RθJA = 75 °C/W and RθJL = 15 °C/W, and is rated for TJ = –55 °C to +150 °C operation. The device meets UL 497B recognition (QVGQ2) and is qualified per AEC-Q101 for automotive under-hood and chassis applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 56.7 V / 62.7 V at IT = 1 mA - Ensures reliable, repeatable breakdown within tight tolerance band |
| VC @ IPPM | 82.4 V at 18.2 A - Clamping voltage during 10/1000 µs surge; defines maximum protected-line voltage excursion |
| PPPM | 1500 W - Peak transient energy handling capability under standardized waveform |
| ID @ VWM | ≤1.0 µA - Ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments and industrial enclosures |
| AEC-Q101 | Qualified - Validated for automotive reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMCG (DO-215AB) - surface-mount, low-profile gull-wing leaded package with matte tin-plated terminals; meets UL 94 V-0, J-STD-002 solderability, and JESD 201 Class 2 whisker resistance. Bidirectional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | One terminal of symmetrical avalanche junction; conducts during negative surges |
| Cathode | Transient current entry (positive half-cycle) | Other terminal of symmetrical junction; conducts during positive surges; no band marking |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating lines without polarity concerns |
| 1500 W PPPM rating | Withstands high-energy transients such as ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surges |
| AEC-Q101 qualification | Validates reliability for automotive ECUs, ADAS sensors, and body control modules |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without preconditioning or special handling |
| Glass-passivated junction | Ensures long-term parameter stability and low leakage drift over temperature and life |
Applications
| Automotive Sensor Protection | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential or single-ended signal lines upstream of interface ICs. Use Value: Limits transient voltage to ≤82.4 V, preventing damage to downstream 5 V or 3.3 V interface receivers while maintaining signal fidelity. |
Use Scenario: Shielding PLC digital input channels from field-induced surges caused by relay coil switching or lightning-induced coupling. IC Role / Device Role / Timing Role: Primary front-end clamp on 24 V DC input lines, working in concert with series impedance and filtering. Use Value: Absorbs up to 1500 W of transient energy without degradation, ensuring system uptime and reducing field failure rates. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Safeguarding Ethernet PHY or RS-485 transceivers connected to unshielded outdoor cabling exposed to EFT and surge events. IC Role / Device Role / Timing Role: Secondary-level protection device located after gas discharge tube (GDT) primary stage. Use Value: Provides sub-100 ns clamping response and low clamping voltage to prevent latch-up or permanent damage to sensitive transceiver ICs. |
Use Scenario: Protecting USB-C or barrel jack input stages in smart home adapters against user-handling ESD and AC line transients. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp on DC input rail prior to primary regulator. Use Value: Delivers certified AEC-Q101 reliability and UL 497B recognition-critical for safety-certified consumer power designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51CA | Same VWM/VBR/PPPM specs but SMA (DO-214AC) package; higher RθJA (110 °C/W) and lower surge current rating (17.1 A) | Limited to lower-power or less thermally constrained layouts; not AEC-Q101 qualified | Select when board space allows larger footprint and automotive qualification is not required |
| 1.5KE51CA | Higher PPPM (1500 W same), but axial DO-201 package; 3× larger volume, manual assembly only, no MSL rating | Suitable for prototyping or non-SMT legacy systems; incompatible with automated SMT lines | Choose only for through-hole retrofit or low-volume repair scenarios where reflow compatibility is irrelevant |
Compared with SMAJ51CA and 1.5KE51CA, the SMCG51CA-E3/57T offers superior thermal performance (RθJL = 15 °C/W), AEC-Q101 validation, and full MSL Level 1 compliance-making it the preferred choice for production automotive and industrial SMT designs requiring zero rework risk and long-term reliability.
Availability
SMCG51CA-E3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMCG51CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCG series was developed to deliver high-power, AEC-Q101-qualified TVS protection in compact surface-mount packages for next-generation automotive and industrial electronics demanding robust transient immunity and automated manufacturability.
FAQ
What is the clamping voltage of SMCG51CA-E3/57T and how is it measured?
The SMCG51CA-E3/57T has a maximum clamping voltage (VC) of 82.4 V, measured at a peak pulse current (IPPM) of 18.2 A under the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed per datasheet test conditions using 0.31" × 0.31" copper pads per terminal and represents the upper limit of voltage seen by protected circuitry during worst-case transient events. The SMCG51CA-E3/57T maintains this clamping performance across its full operating temperature range.
Is SMCG51CA-E3/57T suitable for automotive applications?
Yes, SMCG51CA-E3/57T is explicitly AEC-Q101 qualified and rated for operation from –55 °C to +150 °C, making it suitable for under-hood, chassis, and infotainment applications. Its UL 497B recognition (QVGQ2), MSL Level 1 reflow compatibility, and glass-passivated junction ensure reliability in harsh automotive environments. The SMCG51CA-E3/57T is commonly deployed in ADAS camera modules and body control units where transient immunity is mission-critical.
Does SMCG51CA-E3/57T have polarity markings?
No, SMCG51CA-E3/57T is a bidirectional TVS diode and carries no polarity marking-its symmetrical construction enables identical clamping behavior for both positive and negative transients. Unlike unidirectional variants (e.g., SMCG51A), the SMCG51CA-E3/57T lacks a cathode band. This simplifies layout and eliminates orientation errors during automated placement, a key advantage confirmed in Vishay's mechanical drawings and ordering documentation for the SMCG51CA-E3/57T.
What is the thermal resistance of SMCG51CA-E3/57T and how does it affect PCB layout?
The SMCG51CA-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To achieve rated 6.5 W power dissipation at TA = 50 °C, PCB layout must replicate this pad area and ensure adequate copper pour and via stitching. Deviations reduce safe operating current and increase junction temperature-directly impacting SMCG51CA-E3/57T lifetime and clamping consistency.
How does SMCG51CA-E3/57T compare to unidirectional SMCG51A in terms of electrical performance?
SMCG51CA-E3/57T and SMCG51A share identical VWM (51 V), VBR (56.7–62.7 V), PPPM (1500 W), and VC (82.4 V) ratings-but differ fundamentally in conduction directionality. The SMCG51CA-E3/57T clamps symmetrically in both polarities, while SMCG51A clamps only in reverse bias and conducts forward current like a rectifier. This makes SMCG51CA-E3/57T mandatory for AC, floating, or bidirectional signal lines; SMCG51A is reserved for DC rails with defined polarity. Both use the same SMCG (DO-215AB) package and thermal specs.
SMCG51CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCG51CA-E3/57T FAQ
1.How can I place an order for SMCG51CA-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG51CA-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 SMCG51CA-E3/57T reliable?
The price and inventory of SMCG51CA-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 SMCG51CA-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCG51CA-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG51CA-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG51CA-E3/57T?
SMCG51CA-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG51CA-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 SMCG51CA-E3/57T?
For technical support, including SMCG51CA-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG51CA-E3/57T requirements.
6.How does Aetrix verify that SMCG51CA-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG51CA-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 SMCG51CA-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCG51CA-E3/57T?
All SMCG51CA-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG51CA-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 SMCG51CA-E3/57T part is unused and in its original packaging.
Return procedure for SMCG51CA-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG51CA-E3/57T Tags
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