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iso7721dr

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by Ray

Texas Instruments Digital Isolators, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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ISO7721DR

Texas Instruments · Digital Isolators · SOIC-8

ISO7721DR 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 Side-1 power supply input. Operates 2.25 V to 5.5 V; absolute maximum 6 V referenced to GND1. Bypass locally to GND1.
2 OUTA output Channel A digital output on side 1. CMOS/LVCMOS-level buffered output driven from the isolated INA signal received across the SiO2 barrier. Referenced to GND1 and powered from VCC1.
3 INB input Channel B digital input on side 1. CMOS/LVCMOS logic input, referenced to GND1 and powered from VCC1; drives the isolated OUTB on side 2.
4 GND1 power_in Side-1 ground return for VCC1, INB, and OUTA. Galvanically isolated from GND2 across the capacitive SiO2 barrier.
5 GND2 power_in Side-2 ground return for VCC2, INA, and OUTB. Galvanically isolated from GND1 across the capacitive SiO2 barrier.
6 OUTB output Channel B digital output on side 2. CMOS/LVCMOS-level buffered output driven from the isolated INB signal received across the SiO2 barrier. Referenced to GND2 and powered from VCC2.
7 INA input Channel A digital input on side 2. CMOS/LVCMOS logic input, referenced to GND2 and powered from VCC2; drives the isolated OUTA on side 1.
8 VCC2 power_in Side-2 power supply input. Operates 2.25 V to 5.5 V; absolute maximum 6 V referenced to GND2. Bypass locally to GND2.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-8
Category Signal Isolation Devices
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • ISO7721DR
  • ISO7721DRD
  • ISO7721DRDWVR
  • ISO7721DRDWV
  • ISO7721DRDWR
  • ISO7721DRDW

CAD (KiCad official)

  • Symbol: ISO7721DR
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (51 pp, sha256 fb039c00ceb601b9, 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

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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