# 25AA320AT-I

**Microchip Tech** · EEPROM · SOIC-8

25AA320AT-I from Microchip Tech, in a SOIC-8. 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 | CS | input | Chip Select input: a low level selects the device, a high level deselects it and forces Standby mode with SO in high-impedance. |
| 2 | SO | tri_state | Serial Data Output: data is shifted out after the falling edge of SCK, and the pin is high-impedance when the device is deselected or HOLD is low. |
| 3 | WP | input | Write-Protect: with WPEN set, WP low disables writes to the nonvolatile bits of the STATUS register; when WP is high all functions operate normally. |
| 4 | VSS | power_in | Ground. |
| 5 | SI | input | Serial Data Input: receives instructions, addresses and data, latched on the rising edge of SCK. |
| 6 | SCK | input | Serial Clock Input: synchronizes communication, with SI latched on the rising edge and SO updated after the falling edge (maximum 10 MHz). |
| 7 | HOLD | input | Hold Input: pulling it low while SCK is low pauses serial communication without resetting the sequence, and it must be held high when unused. |
| 8 | VCC | power_in | Supply Voltage: 1.8V to 5.5V for 25AA320A, with an absolute maximum of 6.5V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOIC-8 |
| Category | Memory |
| Pins | 8 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | 8-Lead Plastic Small Outline (SN) - Narrow, 3.90 mm (.150 In.) Body [SOIC] A A2 | 21 |

## CAD (KiCad official)

- Symbol: `25AA320AT-I`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `25aa320at-i-etched.step` / `25aa320at-i-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `25aa320at-i.step` / `25aa320at-i.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Microchip Tech datasheet](docs/25aa320at-i-datasheet.pdf) (35 pp, sha256 `dbf67271ea97ee8d`, retrieved 2026-10-30, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/25aa320at-i-datasheet.pdf)