# ISO7821LLDWW

**Texas Instruments** · Isolated LVDS Buffers · SOIC-16

ISO7821LLDWW 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 | VCC1 | power_in | Power supply for side 1 (VCC1) of the isolation barrier. |
| 2 | GND1 | power_in | Ground connection for VCC1 (side 1). |
| 3 | INA+ | input | Positive differential input, channel A. |
| 4 | INA- | input | Negative differential input, channel A. |
| 5 | OUTB- | output | Negative differential output, channel B. |
| 6 | OUTB+ | output | Positive differential output, channel B. |
| 7 | EN1 | input | Output enable 1: side-1 output pins are enabled when EN1 is high or open and are high impedance when EN1 is low. |
| 8 | GND1 | power_in | Ground connection for VCC1 (side 1). |
| 9 | GND2 | power_in | Ground connection for VCC2 (side 2). |
| 10 | EN2 | input | Output enable 2: side-2 output pins are enabled when EN2 is high or open and are high impedance when EN2 is low. |
| 11 | INB+ | input | Positive differential input, channel B. |
| 12 | INB- | input | Negative differential input, channel B. |
| 13 | OUTA- | output | Negative differential output, channel A. |
| 14 | OUTA+ | output | Positive differential output, channel A. |
| 15 | GND2 | power_in | Ground connection for VCC2 (side 2). |
| 16 | VCC2 | power_in | Power supply for side 2 (VCC2) of the isolation barrier. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `ISO7821LLDWW`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `iso7821lldww-etched.step` / `iso7821lldww-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `iso7821lldww.step` / `iso7821lldww.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/iso7821ll) (40 pp, sha256 `2d74a1d0aa8124a6`, retrieved 2026-10-11, 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/iso7821lldww-datasheet.pdf)