component
ISOW7721DFMR
Public Made by Adomby adom
Texas Instruments Digital Isolators (With Power), SOIC-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads on click. Unloads only if this page sits in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads on click. Unloads only if this page sits in the background.
PCB Footprint
Open full view ↗Loads on click. Unloads only if this page sits in the background.
Datasheet
Open in new tab ↗Loads on click. Unloads only if this page sits in the background.
README
markdownISOW7721DFMR
Texas Instruments · Digital Isolators (With Power) · SOIC-20
ISOW7721DFMR 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 voltage. |
| 2 | INA | input | Input channel A. |
| 3 | OUTB | output | Output channel B. |
| 4 | EN_IO1 | input | Output Enable 1; when high or open the channel output pin on side 1 is enabled, when low the output is in high impedance state and transmitter is disabled. |
| 5 | EN | bidirectional | Power converter enable input pin; DC-DC power converter is enabled when high to VIO voltage level and disabled when low at GND1 voltage level. |
| 6 | GNDIO | power_in | Ground connection for VIO; GND1 and GNDIO need to be shorted on board. |
| 7 | LF | input | Multiple device primary/secondary control logic; connect to GND1 when used as primary device or to VDD if used as secondary device. |
| 8 | CC | bidirectional | Multiple device primary/secondary synchronization pin; when LF is set to GND1 CC is an output, when LF is set to VDD CC is an input. |
| 9 | VDD | power_in | Side 1 DC-DC converter power supply voltage. |
| 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 pins can be shorted on board or connected through a ferrite bead. |
| 12 | VISOOUT | power_out | Isolated power converter output voltage; VISOIN and VISOOUT pins can be shorted on board or connected through a ferrite bead. |
| 13 | VSEL | input | VISOOUT selection pin; VISOOUT = 5 V when VSEL shorted to VISOOUT, VISOOUT = 3.3 V when VSEL shorted to GND2. |
| 14 | NC | unconnected | No Connect. |
| 15 | GISOIN | power_in | Ground connection for VISOIN; GND2 and GISOIN pins can be shorted on board or connected through a ferrite bead. |
| 16 | NC | unconnected | No Connect. |
| 17 | EN_IO2 | input | Output Enable 2; when high or open the channel output pin on side 2 is enabled, when low the output is in high impedance state and transmitter is disabled. |
| 18 | INB | input | Input channel B. |
| 19 | OUTA | output | Output channel A. |
| 20 | VISOIN | power_in | Side 2 supply voltage for isolation channels; VISOIN and VISOOUT pins can be shorted on board or connected through a ferrite bead. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-20 |
| Category | Signal Isolation Devices |
| Pins | 20 |
CAD (KiCad official)
- Symbol:
ISOW7721DFMR - Footprint:
Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm - 3D model: SOIC-20 (KiCad packages3D, STEP)
- 3D model files:
isow7721dfmr-etched.step/isow7721dfmr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);isow7721dfmr.step/isow7721dfmr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (56 pp, sha256
23d359783521eebd, retrieved 2026-10-05, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).