# ISO7021FDR

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

ISO7021FDR 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 | Power supply for side 1 of the isolation barrier. |
| 2 | OUTA | output | Output channel A with high-level voltage VCCO - 0.4V and low-level voltage 0.4V. |
| 3 | INB | input | Input channel B with switching threshold 0.3V to 0.7V × VCCI. |
| 4 | GND1 | power_in | Ground connection for VCC1. |
| 5 | GND2 | power_in | Ground connection for VCC2. |
| 6 | OUTB | output | Output channel B with high-level voltage VCCO - 0.4V and low-level voltage 0.4V. |
| 7 | INA | input | Input channel A with switching threshold 0.3V to 0.7V × VCCI. |
| 8 | VCC2 | power_in | Power supply for side 2 of the isolation barrier. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `ISO7021FDR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `iso7021fdr-etched.step` / `iso7021fdr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `iso7021fdr.step` / `iso7021fdr.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/iso7021) (33 pp, sha256 `6bd32f3a3baf3002`, retrieved 2026-10-03, 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 0.3`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-5-5` (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/iso7021fdr-datasheet.pdf)