component
AT25256B-XHL-T
Public Made by Adomby adom
Microchip Tech EEPROM, TSSOP-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
markdownAT25256B-XHL-T
Microchip Tech · EEPROM · TSSOP-8
AT25256B-XHL-T from Microchip Tech, in a TSSOP-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 | The device is selected when CS is low, and when deselected SI is ignored and SO stays in high-impedance; a pull-up to VCC of 10 kΩ or less is recommended, with a low level required on CS before any sequence starts after power-up. |
| 2 | SO | output | Serial Data Output transfers read data out of the device, shifting it after the falling edge of SCK, and is high-impedance when the device is not selected. |
| 3 | WP | input | Write-Protect allows normal read/write operation when high, and when driven low with WPEN set to 1 it inhibits all writes to the STATUS register; it should be driven high or low as appropriate. |
| 4 | GND | power_in | Ground is the ground reference for the device power supply and should be connected to system ground. |
| 5 | SI | input | Serial Data Input receives instructions, addresses and data, latched on the rising edge of SCK, and is ignored while HOLD is asserted. |
| 6 | SCK | input | Serial Data Clock synchronizes communication with the master, latching SI on the rising edge and clocking SO out on the falling edge. |
| 7 | HOLD | input | Suspend Serial Input pauses serial communication when driven low while SCK is low, during which SO is high-impedance and SI and SCK are ignored; it should be driven high or low as appropriate. |
| 8 | VCC | power_in | Device Power Supply supplies the source voltage, which operates from 1.8 V to 5.5 V, and operation at invalid VCC voltages may produce spurious results. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | TSSOP-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 | VCC1 | 1.8 | 5.5 | V | 9 | ||
| Supply Voltage | VCC2 | 2.5 | 5.5 | V | 9 | ||
| Supply Voltage | VCC3 | 4.5 | 5.5 | V | 9 | ||
| VCC Power Supply Low-Voltage Grade | VCC | 1.8 | 5.5 | V | 9 | ||
| Operating Temperature (Case) | -40 | 85 | °C | Industrial Temperature Range | 9 | ||
| Supply Current | ICC1 | 9 | 10 | mA | VCC = 5.0V at 20 MHz, SO = Open, Read | 9 | |
| Supply Current | ICC2 | 5 | 7 | mA | VCC = 5.0V at 10 MHz, SO = Open, Read, Write | 9 | |
| Supply Current | ICC3 | 2.2 | 3.5 | mA | VCC = 5.0V at 1 MHz, SO = Open, Read, Write | 9 | |
| Standby Current | ISB1 | 0.2 | 3 | µA | VCC = 1.8V, CS = VCC | 9 | |
| Standby Current | ISB2 | 0.5 | 3 | µA | VCC = 2.5V, CS = VCC | 10 | |
| Standby Current | ISB3 | 2 | 5 | µA | VCC = 5.0V, CS = VCC | 10 | |
| Input Leakage | IIL | -3 | 3 | µA | VIN = 0V to VCC | 10 | |
| Output Leakage | IOL | -3 | 3 | µA | VIN = 0V to VCC, TAC = 0°C to +70°C | 10 | |
| Input Low-Voltage | VIL | -1 | V | Reference only, not tested; printed max is VCC x 0.3 | 10 | ||
| Output Low-Voltage | VOL1 | 0.4 | V | 3.6V ≤ VCC ≤ 5.5V IOL = 3.0 mA | 10 | ||
| Output Low-Voltage | VOL2 | 0.2 | V | 1.8V ≤ VCC ≤ 3.6V IOL = 0.15 mA | 10 | ||
| Operating Temperature | -55 | 125 | °C | 9 | |||
| Storage Temperature | -65 | 150 | °C | 9 | |||
| Voltage on any pin with respect to ground | -1 | 7 | V | 9 | |||
| VCC | VCC | 6.25 | V | 9 | |||
| DC output current | 5 | mA | 9 | ||||
| ESD protection | 4 | kV | Printed as > 4 kV | 9 | |||
| SCK Clock Frequency | fSCK | 0 | 20 | MHz | VCC = 4.5V to 5.5V | 10 | |
| SCK Clock Frequency | fSCK | 0 | 10 | MHz | VCC = 2.5V to 5.5V | 10 | |
| SCK Clock Frequency | fSCK | 0 | 5 | MHz | VCC = 1.8V to 5.5V | 10 | |
| Output Valid | tV | 0 | 20 | ns | VCC = 4.5V to 5.5V | 12 | |
| Output Valid | tV | 0 | 40 | ns | VCC = 2.5V to 5.5V | 12 | |
| Output Valid | tV | 0 | 80 | ns | VCC = 1.8V to 5.5V | 12 | |
| Data In Setup Time | tSU | 5 | ns | VCC = 4.5V to 5.5V | 11 | ||
| Data In Setup Time | tSU | 10 | ns | VCC = 2.5V to 5.5V | 11 | ||
| Data In Setup Time | tSU | 20 | ns | VCC = 1.8V to 5.5V | 11 | ||
| Data In Hold Time | tH | 5 | ns | VCC = 4.5V to 5.5V | 11 | ||
| Data In Hold Time | tH | 10 | ns | VCC = 2.5V to 5.5V | 11 | ||
| Data In Hold Time | tH | 20 | ns | VCC = 1.8V to 5.5V | 11 | ||
| Write Cycle Time | tWC | 5 | ms | VCC = 4.5V to 5.5V | 12 | ||
| SCK High Time | tWH | 20 | ns | VCC = 4.5V to 5.5V | 11 | ||
| SCK High Time | tWH | 40 | ns | VCC = 2.5V to 5.5V | 11 | ||
| SCK High Time | tWH | 80 | ns | VCC = 1.8V to 5.5V | 11 | ||
| SCK Low Time | tWL | 20 | ns | VCC = 4.5V to 5.5V | 11 | ||
| SCK Low Time | tWL | 40 | ns | VCC = 2.5V to 5.5V | 11 | ||
| SCK Low Time | tWL | 80 | ns | VCC = 1.8V to 5.5V | 11 | ||
| CS High Time | tCS | 100 | ns | VCC = 4.5V to 5.5V | 11 | ||
| CS High Time | tCS | 200 | ns | VCC = 1.8V to 5.5V | 11 | ||
| CS Setup Time | tCSS | 100 | ns | VCC = 4.5V to 5.5V | 11 | ||
| CS Setup Time | tCSS | 200 | ns | VCC = 1.8V to 5.5V | 11 | ||
| CS Hold Time | tCSH | 100 | ns | VCC = 4.5V to 5.5V | 11 | ||
| CS Hold Time | tCSH | 200 | ns | VCC = 1.8V to 5.5V | 11 | ||
| Time required after VCC is stable before the device can accept instructions | tPUP | 100 | µs | 13 | |||
| Power-on Reset Threshold Voltage | VPOR | 1.5 | V | 13 | |||
| Minimum time at VCC = 0V between power cycles | tPOFF | 0.03 | ms | 13 | |||
| Output Capacitance (SO) | COUT | 8 | pF | VOUT = 0V | 14 | ||
| Input Capacitance (CS, SCK, SI, WP, HOLD) | CIN | 6 | pF | VIN = 0V | 14 | ||
| Write Endurance | 1e+06 | Write Cycles | TA = 25°C, VCC = 3.3V, Page Write mode | 14 | |||
| Data Retention | 100 | Years | TA = 55°C | 14 |
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] © 2017 Microchip Technology Inc. | 28 |
CAD (KiCad official)
- Symbol:
AT25256B-XHL-T - Footprint:
Package_SO:TSSOP-8_3x3mm_P0.65mm - 3D model: TSSOP-8 (KiCad packages3D, STEP)
- 3D model files:
at25256b-xhl-t-etched.step/at25256b-xhl-t-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);at25256b-xhl-t.step/at25256b-xhl-t.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (42 pp, sha256
0166fe1a8508df27, retrieved 2026-10-20, tier: lcsc) - 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).