OPA1611AIDR 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	NC	unconnected	No internal connection. Pin may be left floating or connected to any voltage between V- and V+.
2	-IN	input	Inverting input of the op-amp. Common-mode range is (V-)+2 V to (V+)-2 V; input bias current typically ±60 nA (max ±250 nA at VCM=0).
3	+IN	input	Noninverting input of the op-amp. Common-mode range is (V-)+2 V to (V+)-2 V; differential input impedance 20 kΩ ∥ 8 pF.
4	V-	power_in	Negative (lowest) power supply. Total supply (V+)-(V-) is 4.5 V min to 36 V max (±2.25 V to ±18 V dual-supply). Quiescent current is 3.6 mA per channel.
5	NC	unconnected	No internal connection. Pin may be left floating or connected to any voltage between V- and V+.
6	OUT	output	Op-amp output. Rail-to-rail output can swing to within 600 mV of the rails driving a 2 kΩ load, with ±30 mA output drive capability.
7	V+	power_in	Positive (highest) power supply. Total supply (V+)-(V-) is 4.5 V min to 36 V max (±2.25 V to ±18 V dual-supply). Quiescent current is 3.6 mA per channel.
8	NC	unconnected	No internal connection. Pin may be left floating or connected to any voltage between V- and 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.

OPA1611AIDR
OPA1611AIDRG
OPA1611AIDRGR
OPA1611AIDRGT

CAD (KiCad official)

Symbol: OPA1611AIDR
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
`opa1611aidr.step`	122 KB	You want the bare part, or you mark your own boards.
`opa1611aidr-etched.step`	1.9 MB	You want the part with `OPA1611AIDR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 493 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 (31 pp, sha256 2ca72d8fc7b9ac8d, 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