View 18tq datasheet:

Bulletin PD-20178 rev. B 12/01 18TQ... 18TQ...S SCHOTTKY RECTIFIER 18 Amp IF(AV) = 18Amp VR = 35 to 45V Major Ratings and Characteristics Description/Features The 18TQ Schottky rectifier series has been optimized for Characteristics 18TQ Units low reverse leakage at high temperature. The proprietary barrier technology allows for reliable operation up to 175°C IF(AV) Rectangular 18 A junction temperature. Typical applications are in switching power supplies, converters, free-wheeling diodes, and re- waveform verse battery protection. VRRM range 35 to 45 V 175° C TJ operation High purity, high temperature epoxy encapsulation for IFSM @ tp = 5 µs sine 1800 A enhanced mechanical strength and moisture resistance Low forward voltage drop VF @ 18 Apk, TJ = 125°C 0.53 V High