ESDA17P20-1F2 Unidirectional Single Line TVS Diode STMicroelectronics ESDA17P20-1F2 Unidirectional Single Line TVS Diode is designed to protect the power line against EOS and ESD transients. The device is ideal for applications where board space saving is required. The ESDA17P20-1F2 has a 600W (8/20µs) peak pulse power, and a 15V stand-off voltage.