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AT24C256C-SSHL-B
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
markdownAT24C256C-SSHL-B
Microchip Tech · EEPROM · SOIC-8
AT24C256C-SSHL-B 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 | A0 | input | Device address input, hard-wired to GND or VCC; if left floating it is internally pulled down to GND, and Microchip recommends connecting it to a known state with pull-up resistors of 10 kΩ or less. |
| 2 | A1 | input | Device address input, hard-wired to GND or VCC; if left floating it is internally pulled down to GND, and Microchip recommends connecting it to a known state with pull-up resistors of 10 kΩ or less. |
| 3 | A2 | input | Device address input, hard-wired to GND or VCC; if left floating it is internally pulled down to GND, and Microchip recommends connecting it to a known state with pull-up resistors of 10 kΩ or less. |
| 4 | GND | power_in | Ground reference for the power supply, to be connected to the system ground. |
| 5 | SDA | bidirectional | Open-drain serial data input/output that must be pulled high with an external pull-up resistor not exceeding 10 kΩ and may be wire-ORed with other open-drain devices on the bus. |
| 6 | SCL | input | Serial clock input that latches SDA input data on its rising edge and clocks SDA output data on its falling edge; it must be held high when the bus is idle or pulled high with an external pull-up resistor. |
| 7 | WP | input | Write-protect input: connected to GND allows normal writes, connected to VCC inhibits writes to the full array, and if left floating it is internally pulled down to GND (use a known state, pull-up of 10 kΩ or less recommended). |
| 8 | VCC | power_in | Device power supply pin; operation at invalid VCC voltages may produce spurious results and should not be attempted (device operates from 1.7 V to 5.5 V). |
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 |
|---|---|---|---|---|---|---|---|
| Temperature under bias | -55 | 125 | °C | 9 | |||
| Storage temperature | -65 | 150 | °C | 9 | |||
| VCC | VCC | 6.25 | V | 9 | |||
| Voltage on any pin with respect to ground | -1 | 7 | V | 9 | |||
| DC output current | 5 | mA | 9 | ||||
| ESD protection | 4 | kV | 9 | ||||
| Operating Temperature (Case) | -40 | 85 | °C | Industrial Temperature Range | 9 | ||
| VCC Power Supply | VCC | 1.7 | 5.5 | V | Low Voltage Grade | 9 | |
| Supply Voltage | VCC1 | 1.7 | 5.5 | V | 9 | ||
| Supply Current (read) | ICC1 | 1 | 2 | mA | VCC = 5.0V, Read at 400 kHz | 9 | |
| Supply Current (write) | ICC2 | 2 | 3 | mA | VCC = 5.0V, Write at 400 kHz | 9 | |
| Standby Current | ISB1 | 1 | μA | VCC = 1.7V, VIN = VCC or GND | 9 | ||
| Standby Current | ISB1 | 6 | μA | VCC = 5.0V, VIN = VCC or GND | 9 | ||
| Input Leakage Current | ILI | 0.1 | 3 | μA | VIN = VCC or GND; VCC = 5.0V | 9 | |
| Output Leakage Current | ILO | 0.05 | 3 | μA | VOUT = VCC or GND; VCC = 5.0V | 9 | |
| Input Low Level | VIL | -0.6 | V | Note 2 | 9 | ||
| Output Low Level | VOL1 | 0.2 | V | VCC = 1.7V, IOL = 0.15 mA | 10 | ||
| Output Low Level | VOL2 | 0.4 | V | VCC = 3.0V, IOL = 2.1 mA | 10 | ||
| Clock Frequency, SCL | fSCL | 400 | kHz | 1.7V column | 10 | ||
| Clock Frequency, SCL | fSCL | 1000 | kHz | 2.5V, 5.0V column | 10 | ||
| Clock Pulse Width Low | tLOW | 1300 | ns | 1.7V column | 10 | ||
| Clock Pulse Width Low | tLOW | 500 | ns | 2.5V, 5.0V column | 10 | ||
| Clock Pulse Width High | tHIGH | 600 | ns | 1.7V column | 10 | ||
| Clock Pulse Width High | tHIGH | 400 | ns | 2.5V, 5.0V column | 10 | ||
| Noise Suppression Time | tI | 100 | ns | 1.7V column | 10 | ||
| Noise Suppression Time | tI | 50 | ns | 2.5V, 5.0V column | 10 | ||
| Clock Low to Data Out Valid | tAA | 50 | 900 | ns | 1.7V column | 10 | |
| Clock Low to Data Out Valid | tAA | 50 | 450 | ns | 2.5V, 5.0V column | 10 | |
| Bus Free Time between Stop and Start | tBUF | 1300 | ns | 1.7V column | 10 | ||
| Bus Free Time between Stop and Start | tBUF | 500 | ns | 2.5V, 5.0V column | 10 | ||
| Start Hold Time | tHD.STA | 600 | ns | 1.7V column | 10 | ||
| Start Hold Time | tHD.STA | 250 | ns | 2.5V, 5.0V column | 10 | ||
| Start Set-up Time | tSU.STA | 600 | ns | 1.7V column | 10 | ||
| Start Set-up Time | tSU.STA | 250 | ns | 2.5V, 5.0V column | 10 | ||
| Data In Hold Time | tHD.DAT | 0 | ns | 1.7V column | 10 | ||
| Data In Set-up Time | tSU.DAT | 100 | ns | 1.7V column | 10 | ||
| Inputs Rise Time | tR | 300 | ns | 1.7V column | 10 | ||
| Inputs Fall Time | tF | 300 | ns | 1.7V column | 10 | ||
| Inputs Fall Time | tF | 100 | ns | 2.5V, 5.0V column | 10 | ||
| Stop Set-up Time | tSU.STO | 600 | ns | 1.7V column | 10 | ||
| Stop Set-up Time | tSU.STO | 250 | ns | 2.5V, 5.0V column | 10 | ||
| Data Out Hold Time | tDH | 50 | ns | 1.7V column | 10 | ||
| Write Cycle Time | tWR | 5 | ms | 1.7V column | 10 | ||
| Time required after VCC is stable before the device can accept commands | tPUP | 100 | µs | 11 | |||
| Power-on Reset Threshold Voltage | VPOR | 1.5 | V | 11 | |||
| Minimum time at VCC = 0V between power cycles | tPOFF | 500 | ms | 11 | |||
| Input/Output Capacitance (SDA) | CI/O | 8 | pF | VI/O = 0V | 12 | ||
| Input Capacitance (A0, A1, A2 and SCL) | CIN | 6 | pF | VIN = 0V | 12 | ||
| Write Endurance | 1e+06 | Write Cycles | TA = 25°C, VCC = 3.3V, Page Write mode | 12 | |||
| Data Retention | 100 | Years | TA = 55°C | 12 |
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. | 25 |
CAD (KiCad official)
- Symbol:
AT24C256C-SSHL-B - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
at24c256c-sshl-b-etched.step/at24c256c-sshl-b-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);at24c256c-sshl-b.step/at24c256c-sshl-b.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (39 pp, sha256
af946b6870abc724, retrieved 2026-10-17, 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).