Specs side by side
2 parts compared · 3 differing specs across 5 total parameters.
| Parameter | ||
|---|---|---|
| Case | DIP-14 / SOIC-14 | DIP-8 / SOIC-8 |
| Component Category | Voltage Comparators (Quad) | Voltage Comparators |
| Market Reality | The LM339 is the quad comparator - four open-collector channels in a 14-pin body, ground-sensing inputs, single-supply operation, and window/threshold duty in everything from battery chargers to appliance boards. The family is a temperature ladder wearing different numbers: LM139 military, LM239 industrial, LM339 commercial, LM2901 automotive-extended, all electrically identical and pin-identical, with the newer B-generation documented as a drop-in across the row. And the constant companion of this page is the part it is NOT: the LM324 quad op-amp, whose same-size 14-pin body has a different pinout and a linear output - the pair that every electronics course warns about and every parts drawer still manages to mix. | The LM393 is the dual voltage comparator behind every threshold, window and alarm decision in instruments and industrial boards: 2V to 36V supply, ground-sensing inputs, open-collector outputs, and an 8-pin map that is identical to the LM358 op-amp pinout - the twin arrangement that makes socket-level swaps look possible and schematic-level swaps dangerous. Its family tree covers the whole repair shelf: temperature-grade siblings (LM193 / LM293 / LM2903 automotive) and the quad LM339 for four-channel boards. The two failure stories this page exists for: a comparator that stopped switching because the pull-up is missing, and an op-amp fitted into a comparator socket that saturates slowly and cannot wire-OR. |
| Role In Circuit | Original Reference Part | Original Reference Part |
| Sourcing Status | Active Shenzhen Spot Sourcing (24–48h) | Active Shenzhen Spot Sourcing (24–48h) |