BUY LM339D https://www.utsource.net/itm/p/495924.html
QUAD DIFFERENTIAL COMPARATORS
Description: The LM339D is a quad voltage comparator from Texas Instruments. Features: Low Supply Current: 0.8 mA Max Low Input Bias Current: 0.5 nA Max Low Input Offset Voltage: 2.0 mV Max Input Common-Mode Voltage Range Includes Ground Differential Input Voltage Range Equal to the Power Supply Voltage Output Voltage Compatible with TTL, DTL, ECL, MOS, and CMOS Outputs Source/Sink Current Up to 20 mA Low Output Saturation Voltage: 0.4 V Max Applications: Voltage Monitoring Temperature Monitoring Motor Speed Control Level Detection Time Delay Generation Pulse Generation Window Comparators (For reference only)