# OPA365

**Texas Instruments** · Operational amplifier · SOT-23-5

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)
- 3D model files: `opa365-etched.step` / `opa365-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `opa365.step` / `opa365.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/opa365.pdf) (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](docs/opa365-datasheet.pdf)