The TL331, LM339, LM393, and the next generation B-versions (TL331B, LM339B, LM2901B, LM393B, and LM2903B) are a popular and long-lived family of standard comparators due to the flexibility, availability, and cost-effectiveness. Understanding how these comparators are different than most other comparators before using them in your design helps to promote first time design successes. The front page of the B data sheets contains a table showing the differences in specifications between the various classic devices and the new B device.
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This application note includes all comparators devices listed in Table 1-1 including the next generation B-versions which have improved specifications. All of these comparators contain a unique input stage that was revolutionary when released in the early 1970's. Unlike other comparators of that time, the family supported ground level input voltages useful for single supply designs.