# ISO7721FQDWRQ1

**Texas Instruments** · Digital Isolators · SOIC-16

ISO7721FQDWRQ1 from Texas Instruments, in a SOIC-16. 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 | GND1 | power_in | Ground connection for VCC1 on the input side; decouple VCC1 to GND1 with 0.1 µF as recommended by the datasheet. |
| 2 | NC | unconnected | Not connected per the DW-16 pin table; no function on this device. |
| 3 | VCC1 | power_in | Input-side supply voltage, recommended 2.25 V to 5.5 V, set independently of VCC2; place a 0.1 µF decoupling capacitor between VCC1 and GND1. |
| 4 | OUTA | output | Channel A output on the input-side reference (reverse-direction channel driven from INA, pin 13); on F-suffix devices it defaults low when the input side is unpowered or INA is open. |
| 5 | INB | input | Channel B logic input referenced to VCCI, with VIH at least 0.7 x VCCI and VIL at most 0.3 x VCCI, supporting up to 100 Mbps. |
| 6 | NC | unconnected | Not connected per the DW-16 pin table; no function on this device. |
| 7 | GND1 | power_in | Ground connection for VCC1 on the input side (second input-side ground pin on the DW-16 package). |
| 8 | NC | unconnected | Not connected per the DW-16 pin table; no function on this device. |
| 9 | GND2 | power_in | Ground connection for VCC2 on the output side; decouple VCC2 to GND2 with 0.1 µF. |
| 10 | NC | unconnected | Not connected per the DW-16 pin table; no function on this device. |
| 11 | NC | unconnected | Not connected per the DW-16 pin table; no function on this device. |
| 12 | OUTB | output | Channel B output referenced to VCCO; VOH is at least VCCO - 0.4 V at 5 V with IOH = -4 mA, and the F-suffix device defaults low when the input is unpowered or open. |
| 13 | INA | input | Channel A logic input (reverse-direction channel) on the output-side reference, with VIH at least 0.7 x VCCI and VIL at most 0.3 x VCCI, supporting up to 100 Mbps. |
| 14 | VCC2 | power_in | Output-side supply voltage, recommended 2.25 V to 5.5 V, set independently of VCC1; place a 0.1 µF decoupling capacitor between VCC2 and GND2. |
| 15 | NC | unconnected | Not connected per the DW-16 pin table; no function on this device. |
| 16 | GND2 | power_in | Ground connection for VCC2 on the output side (second output-side ground pin on the DW-16 package). |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `ISO7721FQDWRQ1`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `iso7721fqdwrq1-etched.step` / `iso7721fqdwrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `iso7721fqdwrq1.step` / `iso7721fqdwrq1.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 2026-10-08, 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/iso7721fqdwrq1-datasheet.pdf)