JRC4558 from MSKSEMI, in a SOP-8. 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	OUT1	output	Amplifier A output. Op-amp output with short-circuit protection; can source/sink up to 5 mA at typical VOH=13.4 V (VCC+=15 V, Iout=-5 mA).
2	IN1-	input	Amplifier A inverting input. Typical input bias current 50 nA, offset current 10 nA. Common-mode range from VCC- to (VCC+ - 1.5 V).
3	IN1+	input	Amplifier A non-inverting input. Typical input bias current 50 nA. Common-mode range from VCC- to (VCC+ - 1.5 V).
4	VCC-	power_in	Negative supply / ground. Connect to GND for single-supply operation (VCC+ = 3 V to 30 V) or to -15 V for dual-supply operation (±15 V). Absolute maximum single-supply 36 V, dual-supply ±18 V.
5	IN2+	input	Amplifier B non-inverting input. Typical input bias current 50 nA. Common-mode range from VCC- to (VCC+ - 1.5 V).
6	IN2-	input	Amplifier B inverting input. Typical input bias current 50 nA, offset current 10 nA. Common-mode range from VCC- to (VCC+ - 1.5 V).
7	OUT2	output	Amplifier B output. Op-amp output with short-circuit protection; can source/sink up to 5 mA at typical VOH=13.4 V (VCC+=15 V, Iout=-5 mA).
8	VCC+	power_in	Positive supply. Single-supply range 3 V to 30 V (VCC- = GND) or dual-supply +15 V. Typical quiescent current 0.5 mA at VCC+=5 V, 0.8 mA at VCC+=30 V. Absolute maximum single-supply 36 V.

Key specifications

Parameter	Value
Manufacturer	MSKSEMI
Package	SOP-8
Category	Op-amp/Cmp
Pins	8

CAD (KiCad official)

Symbol: JRC4558
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`jrc4558.step`	122 KB	You want the bare part, or you mark your own boards.
`jrc4558-etched.step`	1.8 MB	You want the part with `JRC4558` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 446 faces against 147 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: MSKSEMI datasheet (7 pp, sha256 e3e4998fc56208de, 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