CAT24C128WI-GT3

@@ -0,0 +1,53 @@+# CAT24C128WI-GT3++**onsemi** · EEPROM · SOIC-8++CAT24C128WI-GT3 from onsemi, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | A0 | input | Device address input bit 0. Combined with A1 and A2 to select one of up to 8 devices on the same I2C bus; must match the corresponding bit in the slave address byte. Internally pulled LOW when left undriven. |+| 2 | A1 | input | Device address input bit 1. Combined with A0 and A2 to select one of up to 8 devices on the same I2C bus. Internally pulled LOW when left undriven. |+| 3 | A2 | input | Device address input bit 2. Combined with A0 and A1 to select one of up to 8 devices on the same I2C bus. Internally pulled LOW when left undriven. |+| 4 | VSS | power_in | Ground reference for the device. Connect directly to the system ground plane. |+| 5 | SDA | bidirectional | I2C serial data input/output. Open-drain output; requires an external pull-up resistor to VCC. Data is latched on the rising edge of SCL and driven on the falling edge. |+| 6 | SCL | input | I2C serial clock input driven by the bus master. Supports Standard (100 kHz), Fast (400 kHz) and Fast-Plus (1 MHz, Rev C) modes. |+| 7 | WP | input | Write Protect input. When held HIGH, all write operations to the EEPROM array are inhibited; tie LOW (or leave undriven - pin is internally pulled LOW) to allow writes. Strong internal pull-down; external driver must source the pull-down current when driving HIGH. |+| 8 | VCC | power_in | Positive supply input, 1.8 V to 5.5 V. Bypass locally with a 0.1 uF capacitor to VSS. Typical operating currents: 1 mA read, 3 mA write; standby current ~1-5 uA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | onsemi |+| Package | SOIC-8 |+| Category | Memory |+| Pins | 8 |++## Ordering variants++- `CAT24C128WI-GT3W`+- `CAT24C128WI-GT3WI-GT3`+- `CAT24C128WI-GT3L`+- `CAT24C128WI-GT3Y`+- `CAT24C128WI-GT3Z`+- `CAT24C128WI-GT3HU4`+- `CAT24C128WI-GT3HU3`++## CAD (KiCad official)++- Symbol: `CAT24C128WI-GT3`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/cat24c128wi-gt3-d.pdf) (16 pp, sha256 `287d5c87d3fe9a4a`, 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/cat24c128wi-gt3-datasheet.pdf)

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