Tol is the maximum voltage that can be supplied (10%).Working test voltage should be set to 85mA for this device to operate.When the voltage (Temp Coeff) reaches its maximum, it reaches 25.5mV/°C.
1N2989A Features
the working test voltage to 85mA minimal dynamic impedance is 85mA
1N2989A Applications
There are a lot of Microsemi Corporation 1N2989A applications of zener single diodes.