ISO7221

@@ -0,0 +1,52 @@+# ISO7221++**Texas Instruments** · 2-channel digital isolator · SOIC-8++A dual-channel digital isolator in SOIC-8 that passes logic signals across a galvanic isolation barrier, a fast, reliable replacement for optocouplers. It carries two channels in opposite directions (one A-to-B, one B-to-A), each side powered from its own supply (VCC1, VCC2), with an isolation barrier rated to about 2.5 kVrms that breaks ground loops and protects low-voltage logic from a high-voltage or noisy domain. Built on a capacitive isolation core, it is faster (up to 150 Mbps depending on grade), lower power, and more stable over temperature and lifetime than an optocoupler. Common uses are isolated UART/SPI links, RS-485/CAN side isolation, and isolated control signals. The related ISO7220/7231/7241 offer other channel counts and directions.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VCC1 | power_in | Power supply for side 1 (input for channel A, output for channel B). 2.8 V / 3.3 V / 5 V; independently referenced to GND1. Decouple locally with a 0.1 µF ceramic near the pin. |+| 2 | OUTA | output | Buffered CMOS output of channel A on side 1 of the isolation barrier (isolated copy of INA on side 2). 4 mA drive; output high/low tracks VCC1. |+| 3 | INB | input | Digital input of channel B on side 1. A-, B-, and C-option devices apply a TTL input threshold (VIH ≥ 2 V, VIL ≤ 0.8 V) with input noise filtering; M-option uses a CMOS threshold (0.7·VCC / 0.3·VCC). If undriven for >4 µs the failsafe drives the isolated output high. |+| 4 | GND1 | power_in | Ground reference for side 1 (VCC1 domain). Galvanically isolated from GND2 by the SiO₂ barrier. |+| 5 | GND2 | power_in | Ground reference for side 2 (VCC2 domain). Galvanically isolated from GND1 by the SiO₂ barrier. |+| 6 | OUTB | output | Buffered CMOS output of channel B on side 2 (isolated copy of INB on side 1). 4 mA drive; output high/low tracks VCC2. |+| 7 | INA | input | Digital input of channel A on side 2. A-, B-, and C-option devices use TTL thresholds with input noise filtering; M-option uses CMOS thresholds. Failsafe forces the isolated output high when INA is undriven for >4 µs. |+| 8 | VCC2 | power_in | Power supply for side 2 (input for channel A, output for channel B). 2.8 V / 3.3 V / 5 V; independently referenced to GND2. Decouple locally with a 0.1 µF ceramic near the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 2-channel digital isolator |+| Channels | 2 (one each direction) |+| Isolation | ~2.5 kVrms barrier (capacitive) |+| Data rate | up to 150 Mbps (by grade) |+| Supplies | VCC1 + VCC2 (independent) |+| Advantage | faster + longer-life than optocoupler |+| Supply voltage | 3.3-5 V each side |+| Package | SOIC-8 |++## Ordering variants++- `ISO7221CD (SOIC-8)`+- `ISO7221AD (SOIC-8)`++## CAD (KiCad official)++- Symbol: `ISO7221 (generated from datasheet; KiCad has no symbol)`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/iso7221c.pdf) (39 pp, sha256 `b74a541cca2d68e0`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/iso7221-datasheet.pdf)

@@ -0,0 +1,35 @@+{+  "slug": "iso7221",+  "version": "0.1.0",+  "type": "component",+  "description": "TI dual-channel digital isolator, SOIC-8. Galvanic isolation, one channel each direction, up to 150 Mbps. Datasheet-verified.",+  "tags": [+    "component",+    "interface",+    "digital-isolator",+    "galvanic-isolation",+    "soic-8",+    "texas-instruments"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "iso7221.kicad_sym",+    "iso7221.kicad_mod",+    "iso7221.glb",+    "docs/hero.png",+    "docs/iso7221-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file