Overview
The TPSMC28A is a surface-mount TVS diode designed to protect sensitive electronic components from transient voltage events such as electrostatic discharge (ESD), lightning strikes, and inductive load switching. It is part of the TPSMC series, known for robust performance in harsh environments. The diode is widely used in telecommunications, automotive electronics, and industrial control systems due to its reliability and compact form factor. Manufactured using advanced semiconductor technology, the TPSMC28A offers a balance of high surge capability and low clamping voltage, ensuring minimal stress on protected circuits. Its surface-mount design (SMC package) facilitates easy integration into modern PCB layouts, making it a preferred choice for high-density applications.
Structure and Working Principle
The TPSMC28A consists of a silicon avalanche diode structure optimized for fast response to voltage transients. When the voltage across the diode exceeds its breakdown voltage (28V for the TPSMC28A), it rapidly conducts current to divert the excess energy away from the protected circuit. This action clamps the voltage to a safe level, typically within nanoseconds. The diode's construction includes a robust junction design to handle high peak pulse currents (up to 30A for an 8/20µs waveform). Its bidirectional variant protects against both positive and negative voltage spikes, while the unidirectional version is optimized for DC circuits. The SMC package features a low-inductance path to enhance performance during high-speed transients.
Key Features
The TPSMC28A stands out for its high surge capability, with a peak pulse power rating of 1500W (10/1000µs waveform). Its low clamping voltage (typically 45V at 10A) ensures minimal residual voltage reaches sensitive components. The diode responds to transients in less than 1 picosecond, making it effective against fast-rising ESD events. Other notable features include a wide operating temperature range (-55°C to +150°C), making it suitable for automotive and industrial applications. The RoHS-compliant construction eliminates hazardous materials, aligning with global environmental standards. Its compact SMC package (7.1mm x 6.2mm) saves board space without compromising performance.
Application Areas
The TPSMC28A is extensively used in telecommunications equipment to protect data lines (e.g., Ethernet, DSL) from lightning-induced surges. In automotive systems, it safeguards infotainment modules, CAN buses, and onboard sensors. Industrial applications include motor drives, PLCs, and power supplies where voltage spikes are common. Consumer electronics such as smartphones and tablets utilize the TPSMC28A for ESD protection on USB and HDMI interfaces. Its reliability also makes it suitable for medical devices and aerospace systems, where failure due to transients is unacceptable. The diode is often deployed in combination with other protection devices (e.g., fuses, varistors) for layered defense against electrical threats.
Maintenance and Precautions
While the TPSMC28A requires no routine maintenance, proper installation is critical to ensure optimal performance. Avoid mechanical stress on the SMC package during PCB assembly, as cracks may compromise the diode's surge-handling capability. Ensure the PCB layout minimizes trace inductance between the TVS diode and the protected circuit. Do not exceed the diode's maximum ratings (e.g., reverse standoff voltage, peak pulse current) to prevent permanent damage. For bidirectional variants, polarity is not a concern, but unidirectional types must be oriented correctly. Store components in anti-static packaging to prevent ESD damage before installation. Regularly inspect protected systems after severe transient events to confirm continued functionality.
B2B Procurement Guide
When sourcing the TPSMC28A, verify the manufacturer's certifications (e.g., ISO 9001, AEC-Q101 for automotive grades). Request detailed datasheets specifying electrical characteristics under your application conditions. Bulk purchases (reels of 1,500–3,000 units) typically reduce per-unit costs by 20–40%. Evaluate suppliers based on lead times (commonly 8–12 weeks for custom orders), minimum order quantities (MOQs), and testing reports. Consider alternative part numbers (e.g., SMAJ28A for lower power) if cost or size constraints exist. For high-reliability applications, opt for extended temperature range variants or those with additional surge-test certifications (e.g., IEC 61000-4-5).
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