CSA220NASOT235 from analogysemi, in a SOT23-5. 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	GND	power_in	Device ground reference.
2	OUT	output	Amplifier analog output. Output = Gain (50V/V for CSA220-50) × (V(RS+) - V(RS-)). Rail-to-rail; drive an ADC or comparator; use 250Ω isolation resistor for CLOAD > 500pF.
3	VDD	power_in	Supply voltage, 2.7V to 5.5V (3.3V nom). Connect at least a 100nF decoupling capacitor to GND. Independent of the input common-mode voltage range.
4	RS-	input	Load-side connection of the external current-sense resistor (Rsense). Differential input; common-mode range 0V to 76V independent of VDD.
5	RS+	input	Power-side (bus) connection of the external current-sense resistor (Rsense). Differential input; common-mode range 0V to 76V independent of VDD.

Key specifications

Parameter	Value
Manufacturer	analogysemi
Package	SOT23-5
Category	Op-amp/Cmp
Pins	5

Ordering variants

Same part, different packaging or reel option.

CSA220LASOT235
CSA220MASOT235
CSA220NASOT235
CSA220PASOT235

CAD (KiCad official)

Symbol: CSA220NASOT235
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`csa220nasot235.step`	85 KB	You want the bare part, or you mark your own boards.
`csa220nasot235-etched.step`	2.7 MB	You want the part with `CSA220NASOT235` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 651 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: analogysemi datasheet (14 pp, sha256 2d652f91e1250e0a, 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