ISO1211DR 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	VCC1	power_in	Power supply, side 1 (logic/controller side). Recommended operating range 2.25V to 5.5V; absolute maximum 6V.
2	EN	input	Output enable (side 1). OUT is enabled when EN is high or open; OUT enters high-impedance state when EN is low. In noisy applications tie EN to VCC1.
3	OUT	output	Channel output (side 1). Push-pull digital output referenced to VCC1/GND1. Recommended IOH = -4/-3/-2 mA and IOL = 4/3/2 mA at VCC1 = 5V/3.3V/2.5V.
4	GND1	power_in	Ground connection for VCC1 (logic/controller side).
5	SUB	passive	Internal connection to the input-chip substrate (field side). For good thermal performance connect to a small 2mm x 2mm floating copper plane. Do NOT connect to FGND or any other signal or plane.
6	FGND	power_in	Field-side ground return for the isolated input.
7	IN	input	Field-side current input. Absolute maximum ±60V; recommended operating range ±60V. Sinks/sources the sensed input current defined by external RTHR/RSENSE network.
8	SENSE	input	Field-side voltage sense input. Absolute maximum ±60V; minimum pulse width 150ns. Used with external RSENSE to set the input current limit.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-8
Category	Comm/UART
Pins	8

Ordering variants

Same part, different packaging or reel option.

ISO1211DR
ISO1212DBQ
ISO1212DBQR

CAD (KiCad official)

Symbol: ISO1211DR
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
`iso1211dr.step`	122 KB	You want the bare part, or you mark your own boards.
`iso1211dr-etched.step`	1.8 MB	You want the part with `ISO1211DR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 455 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 (47 pp, sha256 41e0bc7308dd4e0c, 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