component
25LC640A-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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25LC640A-I
Microchip Tech · EEPROM · SOIC-8
25LC640A-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 and a high level deselects it and forces Standby mode. |
| 2 | SO | output | Serial Data Output; data is shifted out after the falling edge of SCK during a read and SO goes to high impedance when the device is deselected. |
| 3 | WP | input | Write-Protect input; when WP is low and WPEN is high, writing to the nonvolatile bits of the STATUS register is disabled. |
| 4 | VSS | power_in | Ground reference for the device. |
| 5 | SI | input | Serial Data Input; instructions, addresses and data are latched on the rising edge of SCK. |
| 6 | SCK | input | Serial Clock input; SI is latched on the rising edge of SCK and SO is updated after the falling edge. |
| 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 not used. |
| 8 | VCC | power_in | Supply voltage; the 25LC640A VCC range is 2.5-5.5V. |
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 | gold | TDFN (2x3), 8-lead Note 1: “Y” indicates a Nickel Palladium Gold (NiPdAu) finish. | 33 |
CAD (KiCad official)
- Symbol:
25LC640A-I - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
25lc640a-i-etched.step/25lc640a-i-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);25lc640a-i.step/25lc640a-i.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (36 pp, sha256
3e90f4c647903210, retrieved 2026-10-27, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).
# 25LC640A-I
**Microchip Tech** · EEPROM · SOIC-8
25LC640A-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 and a high level deselects it and forces Standby mode. |
| 2 | SO | output | Serial Data Output; data is shifted out after the falling edge of SCK during a read and SO goes to high impedance when the device is deselected. |
| 3 | WP | input | Write-Protect input; when WP is low and WPEN is high, writing to the nonvolatile bits of the STATUS register is disabled. |
| 4 | VSS | power_in | Ground reference for the device. |
| 5 | SI | input | Serial Data Input; instructions, addresses and data are latched on the rising edge of SCK. |
| 6 | SCK | input | Serial Clock input; SI is latched on the rising edge of SCK and SO is updated after the falling edge. |
| 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 not used. |
| 8 | VCC | power_in | Supply voltage; the 25LC640A VCC range is 2.5-5.5V. |
## 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 | | gold | TDFN (2x3), 8-lead Note 1: “Y” indicates a Nickel Palladium Gold (NiPdAu) finish. | 33 |
## CAD (KiCad official)
- Symbol: `25LC640A-I`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `25lc640a-i-etched.step` / `25lc640a-i-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `25lc640a-i.step` / `25lc640a-i.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Microchip Tech datasheet](docs/25lc640a-i-datasheet.pdf) (36 pp, sha256 `3e90f4c647903210`, retrieved 2026-10-27, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/25lc640a-i-datasheet.pdf)