The AMS9491 is a two-terminal micropower band-gap voltage reference diode. It feature a very low dynamic impedance and good temperature coefficient, operating over a 10A to 20mA current range. On-chip trimming is used to provide tight voltage tolerance. Since the AMS9491 is a band-gap reference, uses only transistors and resistors, low noise and good longterm stability result. Careful design of the AMS9491 has made the device exceptionally tolerant of capacitive loading, making it easy to use in almost any reference application. The wide dynamic operating range allows its use with widely varying supplies with excellent regulation. The extremely low power drain of the AMS9491 makes this reference diode useful for micropower circuitry.