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25AA256-I

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Microchip Tech EEPROM, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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25AA256-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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 25aa256-i.step / 25aa256-i.glb are 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, 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