LMH6643MAX from Texas Instruments, in a SOIC-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	OUT A	output	Channel A op-amp output. Rail-to-rail output stage swings to within ~40 mV of either supply rail, sources/sinks up to ~75 mA linearly (short-circuit current +115 mA to +145 mA).
2	-IN A	input	Channel A inverting input. High-impedance voltage-feedback input; input voltage must remain within V- - 0.8 V to V+ + 0.8 V (absolute max).
3	+IN A	input	Channel A non-inverting input. Input common-mode range extends 0.5 V below V- and to within 1 V of V+.
4	V-	power_in	Negative supply rail. Total supply (V+ - V-) 2.7 V to 12.8 V recommended (13.5 V absolute max). Tie to GND for single-supply operation.
5	+IN B	input	Channel B non-inverting input. Input common-mode range extends 0.5 V below V- and to within 1 V of V+.
6	-IN B	input	Channel B inverting input. High-impedance voltage-feedback input; input voltage must remain within V- - 0.8 V to V+ + 0.8 V (absolute max).
7	OUT B	output	Channel B op-amp output. Rail-to-rail output stage swings to within ~40 mV of either supply rail, sources/sinks up to ~75 mA linearly.
8	V+	power_in	Positive supply rail. Total supply (V+ - V-) 2.7 V to 12.8 V recommended (13.5 V absolute max). Bypass with local 0.1 uF ceramic to V-.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-8
Category	Op-amp/Cmp
Pins	8

Ordering variants

Same part, different packaging or reel option.

LMH6643MAX
LMH6643MAXMM
LMH6643MAXMME

CAD (KiCad official)

Symbol: LMH6643MAX
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lmh6643max.step`	122 KB	You want the bare part, or you mark your own boards.
`lmh6643max-etched.step`	1.9 MB	You want the part with `LMH6643MAX` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 485 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: Texas Instruments datasheet (38 pp, sha256 80237cedc72b63d0, 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