TPSMP27HE3/85A

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TVS-Diodes are an important part of modern electronic circuitry. They protect vital components, such as microcontrollers and other sensitive devices, from transient voltage surges. The TPSMP27HE3/85A is a particular type of TVS diode specifically designed to function within the automotive industry.

The most important application of the TPSMP27HE3/85A is in preventing voltage surges generated by electromagnetic interference (EMI) from adversely affecting automotive circuitry. This is achieved by using a metal-oxide solid-state diode that can quickly detect EMI and then direct it away from sensitive components. To achieve this, the component is constructed with an anode, cathode – both separated by a dielectric layer – and an internal controlled avalanche breakdown voltage.

Whenever a voltage surge exceeds the breakdown voltage, the device reacts by instantly switching from its low-resistance, relaxed state to a high-resistance, forming a protective circuit against EMI that will in turn divert the voltage surge to ground. This diversion of energy is known as an electrostatic discharge (ESD).

The theory behind the operation of the TPSMP27HE3/85A is relatively simple but should still be treated with respect. Electromagnetic interference can occur in 3 ways i.e. common mode, normal mode and differential mode. Common mode is generated outside the device, normal mode is generated inside the device, while differential mode is generated between the anode-cathode pairs of the device.

The TPSMP27HE3/85A is designed to respond quickly when subjected to high ESD currents generated during common mode and normal mode. It provides good protection from surge voltages and offers no decrease in its functionality when subjected to transient temperatures up to +125°C.

It should be noted that electromagnetic interference generated during differential mode can cause damage to sensitive components in a circuit, if not properly suppressed. To address this issue, the TPSMP27HE3/85A has been designed with a programmable Zener diode to absorb such transient voltages. This means the device can suppress transient voltages up to 95V during both common mode and differential mode.

In addition to providing excellent protection from EMI, the TPSMP27HE3/85A also offers a low capacitance performance to ensure minimal losses across the circuit. This makes it ideal for applications such as power switching circuits, transceivers, and audio/video systems, as well as automotive systems.

To summarize, the TPSMP27HE3/85A is a TVS diode specifically designed for automotive circuits. It is capable of quickly detecting and diverting EMI away from sensitive components in order to prevent damage. It offers no decrease in functionality when subjected to high transient temperatures and has a programmable Zener diode for additional protection during common mode and differential mode conditions. The low capacitance performance of this TVS diode also makes it well-suited for many automotive and non-automotive applications.

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