CAT24C256WI-GT3

@@ -0,0 +1,58 @@+# CAT24C256WI-GT3++**onsemi** · EEPROM · SOIC-8++CAT24C256WI-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. Hard-wired to VCC or VSS to set the least significant bit of the 3-bit I2C slave address, allowing up to eight CAT24C256 devices to share the bus. Internally pulled down to GND with a weak pull-down. |+| 2 | A1 | input | Device address input bit 1. Tie to VCC or VSS to select part of the 3-bit I2C slave address. Internally pulled down to GND with a weak pull-down. |+| 3 | A2 | input | Device address input bit 2 (MSB of the address select field). Tie to VCC or VSS to select part of the 3-bit I2C slave address. Internally pulled down to GND with a weak pull-down. |+| 4 | VSS | power_in | Ground / 0 V supply reference for the device. |+| 5 | SDA | bidirectional | I2C serial data line. Open-drain bidirectional pin used to transfer address and data into and out of the EEPROM; requires an external pull-up resistor to VCC. Input capacitance is 8 pF max. |+| 6 | SCL | input | I2C serial clock input. Positive edges clock data into the device; negative edges clock data out. Supports Standard (100 kHz), Fast (400 kHz), and Fast-Plus (1 MHz) modes. |+| 7 | WP | input | Write Protect input. When held HIGH, all write operations to the entire memory array are inhibited; when LOW (or left floating with the internal pull-down), writes are enabled. Internally pulled down to GND (strong pull-down until ~0.5 x VCC, then weak). |+| 8 | VCC | power_in | Positive supply voltage input. Operating range 1.8 V to 5.5 V. Standby current typically < 2 uA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | onsemi |+| Package | SOIC-8 |+| Category | Memory |+| Pins | 8 |++## Ordering variants++- `CAT24C256WI-GT3W`+- `CAT24C256WI-GT3WI`+- `CAT24C256WI-GT3X`+- `CAT24C256WI-GT3XI`+- `CAT24C256WI-GT3Y`+- `CAT24C256WI-GT3YI`+- `CAT24C256WI-GT3Z`+- `CAT24C256WI-GT3ZI`+- `CAT24C256WI-GT3L`+- `CAT24C256WI-GT3LI`+- `CAT24C256WI-GT3ZD2`+- `CAT24C256WI-GT3HU4`++## CAD (KiCad official)++- Symbol: `CAT24C256WI-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/cat24c256wi-gt3-d.pdf) (18 pp, sha256 `f6b7e0279c00395b`, 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/cat24c256wi-gt3-datasheet.pdf)

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