Supertex, Inc. introduced FP0030, a 20-V current limiting protection device. The FP0030 can be considered as a normally closed switch with a typical resistance of 4.5 Ohms. The IC starts to turn off when the voltage drop across its two terminals exceeds a nominal value of +/-1.5V. In the off state, the switch can withstand up to +/-20 V across its terminals and allow typical current of 700 uA to flow through it. It may also be used as a resettable fuse to protect power lines against output short circuit conditions. Its fast switching speed protect the system against abrupt over current conditions. The FP0030 is available in a three lead SOT-23 package (FP0030K1-G).