MC4558CDT from STMicroelectronics, in a SO-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	Output 1	output	Op-amp A output. Class-AB push-pull output stage with short-circuit protection; typical output resistance 75 Ω, output short-circuit current 20 mA typ.
2	Inverting input 1	input	Op-amp A inverting input (IN-). High-impedance bipolar input; typical input bias current 50 nA, input resistance 2 MΩ typ.
3	Non-inverting input 1	input	Op-amp A non-inverting input (IN+). Common-mode input range ±12 V typical at Vcc = ±15 V.
4	VCC-	power_in	Negative supply rail. Supply voltage range ±2 V to ±20 V (absolute maximum ±22 V). Shared between both op-amps.
5	Non-inverting input 2	input	Op-amp B non-inverting input (IN+). Common-mode input range ±12 V typical at Vcc = ±15 V.
6	Inverting input 2	input	Op-amp B inverting input (IN-). High-impedance bipolar input; typical input bias current 50 nA, input resistance 2 MΩ typ.
7	Output 2	output	Op-amp B output. Class-AB push-pull output stage with short-circuit protection; typical output resistance 75 Ω.
8	VCC+	power_in	Positive supply rail. Supply voltage range ±2 V to ±20 V (absolute maximum ±22 V). Typical total supply current 2.3 mA (both amplifiers, no load).

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	SO-8
Category	Op-amp/Cmp
Pins	8

Ordering variants

Same part, different packaging or reel option.

MC4558CDT
MC4558CDTID
MC4558CDTIDT
MC4558CDTCN
MC4558CDTCPT

CAD (KiCad official)

Symbol: MC4558CDT
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SO-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`mc4558cdt.step`	122 KB	You want the bare part, or you mark your own boards.
`mc4558cdt-etched.step`	2.0 MB	You want the part with `MC4558CDT` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 484 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: STMicroelectronics datasheet (11 pp, sha256 396f57a6f635dcdb, 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