component
25AA256-I
Public Made by Adomby adom
Microchip Tech EEPROM, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdown25AA256-I
Microchip Tech · EEPROM · SOIC-8
25AA256-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 it into Standby mode. |
| 2 | SO | tri_state | Serial Data Output: data shifts out after the falling edge of SCK, and SO goes to high-impedance when the device is deselected or HOLD is low. |
| 3 | WP | input | Write-Protect: when WP is low and the WPEN STATUS bit is high, writes to the nonvolatile STATUS register bits are 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 the serial clock. |
| 6 | SCK | input | Serial Clock input that synchronizes communication with the master; SI is latched on its rising edge and SO updates after its falling edge. |
| 7 | HOLD | input | Hold input that pauses serial communication when pulled low while SCK is low; it must be held high when the function is not used. |
| 8 | VCC | power_in | Supply voltage, 1.8V to 5.5V for the 25AA256 per the DC characteristics table. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOIC-8 |
| Category | Memory |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | 1.8 | 5.5 | V | Industrial (I) and Extended (E) ranges, VCC = 1.8V to 5.5V | 2 | |
| Ambient temperature, industrial grade | TA | -40 | 85 | °C | Industrial (I) grade | 2 | |
| All inputs and outputs w.r.t. VSS | -0.6 | V | 2 | ||||
| Storage temperature | -65 | 150 | °C | 2 | |||
| Ambient temperature under bias | -40 | 125 | °C | 2 | |||
| Low-level input voltage | VIL | -0.3 | V | VCC ≥ 2.5V | 2 | ||
| Low-level output voltage | VOL | 0.4 | V | IOL = 2.1 mA, VCC = 4.5V | 2 | ||
| Low-level output voltage | VOL | 0.2 | V | IOL = 1.0 mA, VCC = 2.5V | 2 | ||
| Input leakage current | ILI | -1 | 1 | µA | CS = VCC, VIN = VSS OR VCC | 2 | |
| Output leakage current | ILO | -1 | 1 | µA | CS = VCC, VOUT = VSS OR VCC | 2 | |
| Internal capacitance (all inputs and outputs) | CINT | 7 | pF | TA = 25°C, FCLK = 1.0 MHz, VCC = 5.0V (Note 1) | 2 | ||
| Read operating current | ICC | 2.5 | 6 | mA | VCC = 5.5V; FCLK = 10.0 MHz; SO = Open | 2 | |
| Read operating current | ICC | 0.5 | 2.5 | mA | VCC = 2.5V; FCLK = 5.0 MHz; SO = Open | 2 | |
| Write operating current | ICC | 0.6 | 5 | mA | VCC = 5.5V | 2 | |
| Write operating current | ICC | 0.15 | 3 | mA | VCC = 2.5V | 2 | |
| Standby current | ICCS | 5 | µA | CS = VCC = 5.5V, Inputs tied to VCC or VSS, 125°C | 2 | ||
| Standby current | ICCS | 1 | µA | CS = VCC = 5.5V, Inputs tied to VCC or VSS, 85°C | 2 | ||
| Clock frequency | FCLK | 10 | MHz | 4.5V ≤ VCC ≤ 5.5V | 3 | ||
| Clock frequency | FCLK | 5 | MHz | 2.5V ≤ VCC ≤ 4.5V | 3 | ||
| Clock frequency | FCLK | 3 | MHz | 1.8V ≤ VCC ≤ 2.5V | 3 | ||
| CS setup time | TCSS | 50 | ns | 4.5V ≤ VCC ≤ 5.5V | 3 | ||
| CS setup time | TCSS | 100 | ns | 2.5V ≤ VCC ≤ 4.5V | 3 | ||
| CS setup time | TCSS | 150 | ns | 1.8V ≤ VCC ≤ 2.5V | 3 | ||
| CS hold time | TCSH | 100 | ns | 4.5V ≤ VCC ≤ 5.5V | 3 | ||
| CS hold time | TCSH | 200 | ns | 2.5V ≤ VCC ≤ 4.5V | 3 | ||
| CS hold time | TCSH | 250 | ns | 1.8V ≤ VCC ≤ 2.5V | 3 | ||
| CS disable time | TCSD | 50 | ns | 3 | |||
| Data setup time | Tsu | 10 | ns | 4.5V ≤ VCC ≤ 5.5V | 3 | ||
| Data setup time | Tsu | 20 | ns | 2.5V ≤ VCC ≤ 4.5V | 3 | ||
| Data setup time | Tsu | 30 | ns | 1.8V ≤ VCC ≤ 2.5V | 3 | ||
| Data hold time | THD | 20 | ns | 4.5V ≤ VCC ≤ 5.5V | 3 | ||
| Data hold time | THD | 40 | ns | 2.5V ≤ VCC ≤ 4.5V | 3 | ||
| Data hold time | THD | 50 | ns | 1.8V ≤ VCC ≤ 2.5V | 3 | ||
| Clock high time | THI | 50 | ns | 4.5V ≤ VCC ≤ 5.5V | 3 | ||
| Clock high time | THI | 100 | ns | 2.5V ≤ VCC ≤ 4.5V | 3 | ||
| Clock high time | THI | 150 | ns | 1.8V ≤ VCC ≤ 2.5V | 3 | ||
| Clock low time | TLO | 50 | ns | 4.5V ≤ VCC ≤ 5.5V | 3 | ||
| Clock low time | TLO | 100 | ns | 2.5V ≤ VCC ≤ 4.5V | 3 | ||
| Clock low time | TLO | 150 | ns | 1.8V ≤ VCC ≤ 2.5V | 3 | ||
| Output valid from clock low | TV | 50 | ns | 4.5V ≤ VCC ≤ 5.5V | 3 | ||
| Output valid from clock low | TV | 100 | ns | 2.5V ≤ VCC ≤ 4.5V | 3 | ||
| Output valid from clock low | TV | 160 | ns | 1.8V ≤ VCC ≤ 2.5V | 3 | ||
| Output disable time | TDIS | 40 | ns | 4.5V ≤ VCC ≤ 5.5V (Note 1) | 3 | ||
| Output disable time | TDIS | 80 | ns | 2.5V ≤ VCC ≤ 4.5V (Note 1) | 3 | ||
| Output disable time | TDIS | 160 | ns | 1.8V ≤ VCC ≤ 2.5V (Note 1) | 3 | ||
| HOLD setup time | THS | 20 | ns | 4.5V ≤ VCC ≤ 5.5V | 3 | ||
| HOLD setup time | THS | 40 | ns | 2.5V ≤ VCC ≤ 4.5V | 3 | ||
| HOLD setup time | THS | 80 | ns | 1.8V ≤ VCC ≤ 2.5V | 3 | ||
| HOLD hold time | THH | 20 | ns | 4.5V ≤ VCC ≤ 5.5V | 3 | ||
| HOLD hold time | THH | 40 | ns | 2.5V ≤ VCC ≤ 4.5V | 3 | ||
| HOLD hold time | THH | 80 | ns | 1.8V ≤ VCC ≤ 2.5V | 3 | ||
| HOLD low to output high-Z | THZ | 30 | ns | 4.5V ≤ VCC ≤ 5.5V (Note 1) | 4 | ||
| HOLD low to output high-Z | THZ | 60 | ns | 2.5V ≤ VCC ≤ 4.5V (Note 1) | 4 | ||
| HOLD low to output high-Z | THZ | 160 | ns | 1.8V ≤ VCC ≤ 2.5V (Note 1) | 4 | ||
| HOLD high to output valid | THV | 30 | ns | 4.5V ≤ VCC ≤ 5.5V | 4 | ||
| HOLD high to output valid | THV | 60 | ns | 2.5V ≤ VCC ≤ 4.5V | 4 | ||
| HOLD high to output valid | THV | 160 | ns | 1.8V ≤ VCC ≤ 2.5V | 4 | ||
| Internal write cycle time | TWC | 5 | ms | (Note 2) | 4 |
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 | 20 |
CAD (KiCad official)
- Symbol:
25AA256-I - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
25aa256-i-etched.step/25aa256-i-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);25aa256-i.step/25aa256-i.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (31 pp, sha256
1837039621eb7793, retrieved 2026-10-25, 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).