A single low-voltage operational amplifier in the tiny SOT-23-5, the go-to when you need one op-amp in the smallest space on a 3.3 V or 5 V board. Its output swings rail to rail, it works from a single 2.7 to 5.5 V supply, and its 1 MHz gain-bandwidth and 1 V/us slew rate cover sensor buffering, filtering, and level scaling. Because it comes one-per-package it fits a single gain stage without wasting half of a dual op-amp. Pinout is IN+, GND (V-), IN-, OUT, VCC+ (V+).

Pinout

Pin	Name	Type	Function
1	1IN+	input	Noninverting input of the op-amp. Input voltage range −0.2 V to 5.7 V (absolute max); common-mode range specified from V− to (V+ − 1 V). High input impedance analog input.
2	GND	power_in	Negative supply / ground. Connects to 0 V for single-supply operation (VCC+ from 2.7 V to 5.5 V) or to V− for split-supply operation.
3	1IN−	input	Inverting input of the op-amp. Differential input voltage rating ±5.5 V with respect to IN+. High input impedance analog input.
4	OUT	output	Rail-to-rail op-amp output. Short-circuit current typically 40 mA sourcing/sinking. Can swing to within a few mV of both supply rails under light load.
5	VCC+	power_in	Positive supply pin. Recommended operating range 2.7 V to 5.5 V (5.5 V absolute maximum). Decouple with a 0.1 µF ceramic capacitor close to the pin.

Key specifications

Parameter	Value
Type	Single low-voltage op-amp
Output	rail-to-rail
Gain-bandwidth	1 MHz
Slew rate	1 V/µs
Supply voltage	2.7-5.5 V
Input range	includes ground
Quiescent current	~130 µA
Package	SOT-23-5

Ordering variants

Same part, different packaging or reel option.

LMV321IDBVR (SOT-23-5)
LMV321IDCKR (SC-70-5)

CAD (KiCad official)

Symbol: Amplifier_Operational:LMV321
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (53 pp, sha256 05e7739c25379268, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF