RS8751XF from Jiangsu RUNIC Tech, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	OUT	output	Amplifier output. Rail-to-rail output stage; swings to within ~23 mV of either supply rail with a 1 kΩ load. Output source ~85 mA, sink ~125 mA (typical).
2	V-	power_in	Negative supply rail. Tie to GND for single-supply operation (2.5 V to 5.5 V total) or to the negative rail for split-supply operation (±1.25 V to ±2.75 V). Total V+ to V- must not exceed 7.0 V absolute maximum. Bypass with 0.1 uF close to the pin.
3	+IN	input	Non-inverting input. Rail-to-rail input common-mode range extends from -0.2 V to +3.9 V with Vs = 5 V. Input bias current ~1 pA typical. Input signals swinging more than 0.5 V beyond either supply rail must be current-limited to ≤10 mA (internal ESD/clamp diodes to rails).
4	-IN	input	Inverting input. Same common-mode and bias-current specifications as the non-inverting input. Typical input offset voltage between the two inputs is 1.5 mV (max ±7.5 mV).
5	V+	power_in	Positive supply rail. Operating supply voltage 2.5 V to 5.5 V referenced to V- (absolute max V+ to V- = 7.0 V). Quiescent current ~2.9 mA typical per amplifier. Bypass with 0.1 uF close to the pin (10 uF bulk recommended).

Key specifications

Parameter	Value
Manufacturer	Jiangsu RUNIC Tech
Package	SOT-23-5
Category	Op-amp/Cmp
Pins	5

Ordering variants

Same part, different packaging or reel option.

RS8751XF
RS8751XFBXF
RS8751XFXK
RS8751XFXM

CAD (KiCad official)

Symbol: RS8751XF
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`rs8751xf.step`	85 KB	You want the bare part, or you mark your own boards.
`rs8751xf-etched.step`	1.6 MB	You want the part with `RS8751XF` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 404 faces against 102 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Jiangsu RUNIC Tech datasheet (14 pp, sha256 870e4fce48ef79ec, retrieved 2026-08-17, tier: lcsc)
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