Texas Instruments
Texas Instruments LM2901NSR quad differential comparator, 4 elements, 2V to 30V supply, 20mA output, -40°C to 125°C, 14-SOIC surface mount, active production.
MOQ 1 · Tape & Reel (TR); Cut Tape (CT) · RoHS · EIA-481 · DAP/DDP · T/T
| Parameter / Attribute | Specification / Value |
|---|---|
| Type | Differential |
| Output type | CMOS, MOS, Open-Collector, TTL |
| Mounting | Surface Mount |
| Voltage - input offset | 7mV @ 30V |
| Voltage - supply, single (Dual (±)) | 2V ~ 30V, ±1V ~ 15V |
| Output current | 20mA |
| Current - quiescent | 2.5mA |
| Current - input bias | 0.25µA @ 5V |
| Operating temperature | -40°C~125°C |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Case | 14-SOIC (0.209\", 5.30mm Width) |
| Number of elements | 4 |
Package: DIP-14 / SOIC-14 · Pin-compatible replacements with immediate Shenzhen spot stock
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 Wide-Temperature Grade of the Same Quad
Shenzhen Spot Stock (24-48h Dispatch)
The automotive/extended grade (-40 to +125C class) of the identical quad comparator: same channels, same open-collector outputs, same 14-pin map.
Wide single/dual supply (2V to 30V class); the grade moves temperature coverage, not function.
The Current-Generation Drop-In
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The B-generation: documented as a drop-in for the A and V versions with a higher supply ceiling (about 38V), better ESD structure, tighter offset (0.37mV class) and faster response (about 1us) on the same pinout.
38V-class maximum against the standard 30-36V window - margin added, nothing removed.
The Dual Sibling - Same Core, Half the Channels
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The dual (8-pin) member of the same comparator core: identical per-channel behavior, its own grade ladder (LM193/293/393/2903).
Same electrical envelope per channel.
The Lookalike That Is Not - Documented Here
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The quad OP-AMP in the same-size 14-pin family: linear push-pull output against the comparators open collector, and a different pin map (supply on pins 4 and 11 against the LM339s 3 and 12).
Same broad supply envelope, different roles.
Q: What is the difference between LM339 and LM2901?
A: Temperature grade only: LM339 is the commercial part, LM2901 covers the extended/automotive range. Same quad comparator, same 14-pin map, same open-collector outputs.
Q: Can I use an LM324 in place of an LM339?
A: No - and the failure is complete: different pinout (supply on 4/11 against 3/12), linear push-pull output against the comparators open collector, and internal compensation against none. The same-size body is the only shared property.
Q: Is LM339B a drop-in for LM339?
A: Yes - the B-generation is documented as a drop-in for the A and V versions, adding supply headroom (about 38V), better ESD and tighter offset on the same pinout. Re-check the pull-up and hysteresis network as with any comparator change.
Rated for a single supply from 2 V to 30 V, or dual supplies from ±1 V to ±15 V, the LM2901NSR operates on common supply rails.
Maximum input offset voltage is 7 mV at 30 V supply, and maximum input bias current is 0.25 µA at 5 V. The 2.5 mA max quiescent current across all four comparators keeps the power budget lean in always-on sensing blocks.
