Taiwan semiconductor ts431bcx smd adjustable precision shunt regulator sot 23 taiwan semiconductor ts431bcx rf this adjustable precision shunt regulator is packaged in a surface mounting sot 23 package this monolithic voltage reference operates as a low temperature coefficient zener programmable from v sub ref sub to 36v via 2x external resistors the characteristics of this device make it suitable replacements for zener diodes in many applications such as dvms power supplies and op amp c