LM111J

The LM111J from Texas Instruments is a high-performance voltage comparator. It is designed to operate over a wide range of supply voltages, from standard ±15V op amp supplies down to a single 5V supply used for IC logic. This device offers significantly lower input currents compared to older comparator designs.

Key electrical characteristics include a maximum input current of 150 nA over temperature and a maximum offset current of 20 nA over temperature. The differential input voltage range is ±30V, and power consumption is 135 mW at ±15V. The output is compatible with RTL, DTL, and TTL logic families, as well as MOS circuits. It can also drive lamps or relays, switching voltages up to 50V at currents as high as 50 mA.

The LM111J is housed in a CDIP (NAB) 8-pin package and operates across a wide temperature range of -55°C to 125°C. Both inputs and outputs can be isolated from system ground, providing design flexibility. Offset balancing and strobe capability are included, and outputs can be wire OR'ed. While slower than some other comparators with a response time of 200 ns, the LM111J is less prone to spurious oscillations.