component
25AA640A-I
Public Made by Adomby adom
Microchip Tech EEPROM, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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25AA640A-I
Microchip Tech · EEPROM · SOIC-8
25AA640A-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, and a low-to-high transition after a valid write sequence starts an internal write cycle. |
| 2 | SO | tri_state | Serial Data Output: data is shifted out on this pin after the falling edge of SCK, and it goes high-impedance when the device is deselected or HOLD is low. |
| 3 | WP | input | Write-Protect pin: with WPEN set, WP low disables writes to the nonvolatile STATUS register bits, and WP high allows normal operation. |
| 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 (maximum 10 MHz) that synchronizes communication: inputs are latched on the rising edge and SO is updated after the falling edge. |
| 7 | HOLD | input | Hold input: pulling it low (while SCK is low and CS is low) pauses serial communication without resetting the sequence, and it must be held high when not in use. |
| 8 | VCC | power_in | Supply voltage, 1.8V to 5.5V for the 25AA640A. |
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 | 24 |
CAD (KiCad official)
- Symbol:
25AA640A-I - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
25aa640a-i-etched.step/25aa640a-i-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);25aa640a-i.step/25aa640a-i.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (38 pp, sha256
680e11bed3252688, retrieved 2026-10-27, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).
# 25AA640A-I
**Microchip Tech** · EEPROM · SOIC-8
25AA640A-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, and a low-to-high transition after a valid write sequence starts an internal write cycle. |
| 2 | SO | tri_state | Serial Data Output: data is shifted out on this pin after the falling edge of SCK, and it goes high-impedance when the device is deselected or HOLD is low. |
| 3 | WP | input | Write-Protect pin: with WPEN set, WP low disables writes to the nonvolatile STATUS register bits, and WP high allows normal operation. |
| 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 (maximum 10 MHz) that synchronizes communication: inputs are latched on the rising edge and SO is updated after the falling edge. |
| 7 | HOLD | input | Hold input: pulling it low (while SCK is low and CS is low) pauses serial communication without resetting the sequence, and it must be held high when not in use. |
| 8 | VCC | power_in | Supply voltage, 1.8V to 5.5V for the 25AA640A. |
## 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 | 24 |
## CAD (KiCad official)
- Symbol: `25AA640A-I`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `25aa640a-i-etched.step` / `25aa640a-i-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `25aa640a-i.step` / `25aa640a-i.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Microchip Tech datasheet](docs/25aa640a-i-datasheet.pdf) (38 pp, sha256 `680e11bed3252688`, retrieved 2026-10-27, 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/25aa640a-i-datasheet.pdf)