# ISOW7741FQDFMRQ1

**Texas Instruments** · Digital Isolators · SOIC-20

ISOW7741FQDFMRQ1 from Texas Instruments, in a SOIC-20. 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 | VIO | power_in | Side 1 logic supply (1.71V to 5.5V). |
| 2 | INA | input | Input channel A. |
| 3 | INB | input | Input channel B. |
| 4 | INC | input | Input channel C. |
| 5 | OUTD | output | Output channel D. |
| 6 | GNDIO | power_in | Ground connection for VIO; GND1 and GNDIO need to be shorted on board. |
| 7 | EN_IO1 | input | Output Enable 1: high or open enables side 1 channel outputs; low puts side 1 outputs in high impedance and disables side 1 input transmitters. |
| 8 | EN/FLT | bidirectional | Multi-function pin used either as DC-DC converter enable input (high to VIO level enables, low at GND1 level disables) or as active-low fault output (needs 5kΩ or greater pull-up). |
| 9 | VDD | power_in | Side 1 DC-DC converter power supply (3V to 5.5V). |
| 10 | GND1 | power_in | Ground connection for VDD; GND1 and GNDIO need to be shorted on board. |
| 11 | GND2 | power_in | Ground connection for VISOOUT; GND2 and GISOIN can be shorted on board or connected through a ferrite bead. |
| 12 | VISOOUT | power_out | Isolated power converter output voltage; VISOIN and VISOOUT can be shorted on board or connected through a ferrite bead. |
| 13 | VSEL | input | VISOOUT selection: 5V when shorted to VISOOUT, 3.3V when shorted to GND2. |
| 14 | EN_IO2 | input | Output Enable 2: high or open enables side 2 channel outputs; low puts side 2 outputs in high impedance and disables side 2 input transmitters. |
| 15 | GISOIN | power_in | Ground connection for VISOIN; GND2 and GISOIN can be shorted on board or connected through a ferrite bead. |
| 16 | IND | input | Input channel D. |
| 17 | OUTC | output | Output channel C. |
| 18 | OUTB | output | Output channel B. |
| 19 | OUTA | output | Output channel A. |
| 20 | VISOIN | power_in | Side 2 supply voltage for isolation channels; VISOIN and VISOOUT can be shorted on board or connected through a ferrite bead. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-20 |
| Category | Communication Interface Chip/UART/485/232 |
| Pins | 20 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper |  | pins. Verify that enough copper is present on both GND pins to prevent the internal junction temperature of the | 45 |

## CAD (KiCad official)

- Symbol: `ISOW7741FQDFMRQ1`
- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`
- 3D model: SOIC-20 (KiCad packages3D, STEP)
- 3D model files: `isow7741fqdfmrq1-etched.step` / `isow7741fqdfmrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `isow7741fqdfmrq1.step` / `isow7741fqdfmrq1.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/lit/ds/symlink/isow7741-q1.pdf) (59 pp, sha256 `5406e11d61ba200a`, retrieved 2026-10-30, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/isow7741fqdfmrq1-datasheet.pdf)