Overview
The 1.5SMC68A-E3/57T is a surface-mount TVS diode designed to protect electronic circuits from voltage transients. Part of Vishay's SMC series, it offers robust protection with a 68V standoff voltage and 93.6V breakdown voltage. Its compact SMC (DO-214AB) package suits high-density PCB designs. This diode is widely used in telecommunications, industrial controls, and automotive systems where voltage spikes from ESD, lightning, or inductive load switching pose risks. It meets industry standards for reliability and performance, making it a preferred choice for B2B buyers seeking cost-effective overvoltage protection.
Structure and Working Principle
The 1.5SMC68A-E3/57T consists of a silicon avalanche breakdown junction housed in an SMC package. Under normal conditions, it presents high impedance, allowing system operation. When voltage exceeds the breakdown threshold, it clamps the voltage to a safe level by diverting excess current to ground. Its bidirectional design protects against both positive and negative voltage spikes. The diode's fast response time (picosecond range) ensures immediate reaction to transients. The 1.5kW peak pulse power rating (10/1000µs waveform) enables handling of high-energy surges, making it suitable for harsh electrical environments.
Key Features
The 1.5SMC68A-E3/57T offers a 68V standoff voltage with a tight tolerance (±5%) breakdown voltage of 93.6V. Its peak pulse current reaches 16.1A (8/20µs waveform), providing robust transient suppression. The diode operates across a -55°C to +150°C temperature range. Notably, its low leakage current (<1µA at standoff voltage) minimizes power loss during normal operation. The SMC package's compact dimensions (7.1mm x 6.2mm) save board space while allowing efficient heat dissipation. These features combine to deliver reliable protection without compromising system performance or footprint.
Application Areas
Primary applications include protection for data lines, power supplies, and I/O ports in telecom equipment such as routers and base stations. Industrial uses encompass PLCs, motor drives, and control systems vulnerable to voltage spikes. In automotive electronics, it safeguards CAN bus networks, infotainment systems, and ECU interfaces. The diode also sees use in consumer electronics like smart home devices and USB ports. Its versatility makes it suitable for any application requiring robust overvoltage protection in a compact form factor.
Maintenance and Precautions
No routine maintenance is required for TVS diodes, but periodic inspection for physical damage is recommended. Ensure the diode's polarity aligns with circuit design during installation to prevent malfunction. Avoid exposing the component to voltages exceeding its maximum ratings, as this may cause permanent damage. When designing PCB layouts, place the diode close to protected components and use short trace lengths to minimize inductance. For high-frequency applications, consider parasitic capacitance effects (typically 500pF for this model).
B2B Procurement Guide
When procuring 1.5SMC68A-E3/57T diodes, verify manufacturer authenticity to avoid counterfeit components. Vishay Semiconductor is the OEM for this part. Check for RoHS compliance certificates if environmental regulations apply. Bulk purchases (reels of 2,000 units) typically offer 20-30% cost reductions. Lead times vary from 4-12 weeks; plan inventory accordingly. For alternative options, compare specifications with SMAJ68A (smaller package) or SMBJ68A (similar characteristics). Always request recent manufacturing date codes to ensure maximum shelf life (5 years when stored properly).
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