# ISO7721QDRQ1

**Texas Instruments** · Digital Isolators · SOIC-8

ISO7721QDRQ1 from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VCC1 | power_in | Primary-side power supply input with operating voltage range 2.25V to 5.5V. |
| 2 | OUTA | output | Isolated Channel A output with 11ns typical propagation delay and 4mA maximum drive current at 5V. |
| 3 | INB | input | Channel B digital input with high threshold at 0.7×VCCI and low threshold at 0.3×VCCI with 0.1-0.2×VCCI hysteresis. |
| 4 | GND1 | power_in | Ground reference for primary-side power supply and input logic circuits. |
| 5 | GND2 | power_in | Secondary-side ground reference isolated from GND1 by minimum 3000V RMS in D package. |
| 6 | OUTB | output | Isolated Channel B output with 11ns typical propagation delay and 4mA maximum drive current at 5V. |
| 7 | INA | input | Channel A digital input with high threshold at 0.7×VCCI and low threshold at 0.3×VCCI with 0.1-0.2×VCCI hysteresis. |
| 8 | VCC2 | power_in | Secondary-side power supply input with operating voltage range 2.25V to 5.5V independent from VCC1. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `ISO7721QDRQ1`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `iso7721qdrq1-etched.step` / `iso7721qdrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `iso7721qdrq1.step` / `iso7721qdrq1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/iso7721-q1) (52 pp, sha256 `fbb553de6ff2b6fe`, retrieved 2026-09-24, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/iso7721qdrq1-datasheet.pdf)