Rail-to-rail op-amp whose input stage has no crossover region, so it keeps low distortion and a flat offset all the way across the common-mode range, unlike ordinary rail-to-rail parts that glitch mid-swing. A 50 MHz gain-bandwidth and 4.5 nV/rtHz noise suit it to driving precision ADCs and buffering single-supply sensor signals from 2.2 to 5.5 V. A 100 uV offset and 25 V/us slew round it out. The single of the OPA365/2365 family.

Pinout

Pin	Name	Type	Function
1	VOUT	output	Amplifier output. Rail-to-rail; typical swing within 10 mV of either supply rail with a 10 kΩ load. Short-circuit protected to ground (continuous).
2	V-	power_in	Negative (lowest) power supply. Typically GND in single-supply operation, or the negative rail in split-supply operation. Total supply range (V+) - (V-) = 2.2 V to 5.5 V.
3	+IN	input	Positive (noninverting) op-amp input. Rail-to-rail common-mode range extending 100 mV beyond each supply rail. Input bias current typ 0.2 pA; CMOS gate, high impedance.
4	-IN	input	Negative (inverting) op-amp input. Rail-to-rail common-mode range extending 100 mV beyond each supply rail. Input bias current typ 0.2 pA; CMOS gate, high impedance.
5	V+	power_in	Positive (highest) power supply. 2.2 V to 5.5 V referenced to V-. Bypass to V- with a 0.1 µF ceramic capacitor close to the pin.

Key specifications

Parameter	Value
Type	Zero-crossover rail-to-rail op-amp
Gain-bandwidth	50 MHz
Input voltage noise	4.5 nV/rtHz
Input offset	100 uV (typ)
Slew rate	25 V/us
Supply	2.2-5.5 V
Output	Rail-to-rail
Package	SOT-23-5

Ordering variants

Same part, different packaging or reel option.

OPA365AIDBVR (SOT-23-5)
OPA365AID (SO-8)
OPA2365AIDR (dual, SO-8)

CAD (KiCad official)

Symbol: Amplifier_Operational:OPA365xxDBV (KiCad official)
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Texas Instruments datasheet (36 pp, sha256 a241cc6985db2bc7, 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