# ISOW7821DWER

**Texas Instruments** · Digital Isolators (With Power) · SOIC-16-300mil

ISOW7821DWER from Texas Instruments, in a SOIC-16-300mil. 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 | VCC | power_in | Supply voltage for the primary side, referenced to GND1; recommended range is 3 V to 5.5 V. |
| 2 | GND1 | power_in | Ground connection for VCC (primary side). |
| 3 | INA | input | Input channel A (VCC-side logic input). |
| 4 | OUTB | output | Output channel B; the datasheet's pin table labels this pin as I, which conflicts with its name, so the direction shown here follows the name and should be verified. |
| 5 | NC | unconnected | Not connected. |
| 6 | NC | unconnected | Not connected. |
| 7 | EN1 | input | Output enable for side 1: side-1 outputs are enabled when EN1 is high or open and are high impedance when EN1 is low. |
| 8 | GND1 | power_in | Ground connection for VCC (primary side). |
| 9 | GND2 | power_in | Ground connection for VISO (isolated secondary side). |
| 10 | NC | unconnected | Not connected. |
| 11 | SEL | input | VISO selection pin: tie to VISO for a 5 V isolated output, or tie to GND2 or leave floating for 3.3 V. |
| 12 | NC | unconnected | Not connected. |
| 13 | INB | input | Input channel B (isolated-side logic input); the datasheet's pin table labels this pin as O, which conflicts with its name, so the direction shown here follows the name and should be verified. |
| 14 | OUTA | output | Output channel A (isolated-side logic output). |
| 15 | GND2 | power_in | Ground connection for VISO (isolated secondary side). |
| 16 | VISO | power_out | Isolated supply output from the internal DC-DC converter, set to 5 V or 3.3 V by the SEL pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16-300mil |
| Category | Signal Isolation Devices |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `ISOW7821DWER`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16-300mil (KiCad packages3D, STEP)
- 3D model files: `isow7821dwer-etched.step` / `isow7821dwer-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `isow7821dwer.step` / `isow7821dwer.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/isow7821) (43 pp, sha256 `f5fa5e6f336a811b`, retrieved 2026-10-10, 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-5-5` (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/isow7821dwer-datasheet.pdf)