The Texas Instruments LM139J is a high-performance, quad differential comparator product designed and manufactured by Texas Instruments, a global semiconductor company that designs, manufactures, tests and sells analog and embedded processing chips.

• Features: consists of four independent precision voltage comparators with an offset voltage specification as low as 2.0 mV max for all four comparators.
• Power Supply: designed to operate from a single power supply over a wide range of voltages.
• Power Drain: low power drain.
• Operating Conditions: wide range of operating conditions, including a range of supply voltages from 2V to 36V, and temperature ranges from -55°C to 125°C.
• Output: open collector output which allows wired OR outputs.
• Response Time: specified for a 100 mV input step with a 5.0 mV overdrive.
• Packaging: available in a 14-pin CDIP package.