The LM199 series are precision, temperature-stabilized monolithic zeners offering temperature coefficients a factor of ten better than high quality reference zeners. Constructed on a single monolithic chip is a temperature stabilizer circuit and an active reference zener. The active circuitry reduces the dynamic impedance of the zener to about 0.5Ω and allows the zener to operate over 0.5 mA to 10 mA current range with essentially no change in voltage or temperature coefficient. Further, a new subsurface zener structure gives low noise and excellent long term stability compared to ordinary monolithic zeners. The package is supplied with a thermal shield to minimize heater power and improve temperature regulation.
Features
Guaranteed 0.0001%/˚C temperature coefficient
Low dynamic impedance — 0.5Ω
Initial tolerance on breakdown voltage — 2%
Sharp breakdown at 400 µA
Wide operating current — 500 µA to 10 mA
Wide supply range for temperature stabilizer
Guaranteed low noise
Low power for stabilization — 300 mW at 25˚C
Long term stability — 20 ppm
Proven reliability, low-stress packaging in TO-46 integrated-circuit hermetic package, for low hysteresis
after thermal cycling. 33 million hours MTBF at TA = +25˚C (TJ = +86˚C)
