# AT24CS08-SSHM-T

**Microchip Tech** · EEPROM · SOIC-8

AT24CS08-SSHM-T 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 | NC | unconnected | No connect on the AT24CS08; the datasheet states pins 1 and 2 are no connects and can be connected to ground. |
| 2 | A1/NC | unconnected | Not used on the 8-Kbit AT24CS08 (no connect, may be tied to ground); the A1 address input applies only to the 4-Kbit AT24CS04. |
| 3 | A2 | input | Hardwired device address input that must match the A2 bit in the device address word; the AT24CS08 uses it to address one of two 8K devices on a bus. |
| 4 | GND | power_in | Ground reference pin for the device. |
| 5 | SDA | bidirectional | Bidirectional serial data pin that is open-drain driven and may be wire-ORed with other open-drain or open-collector devices. |
| 6 | SCL | input | Serial clock input: data is positive-edge clocked into the EEPROM and negative-edge clocked out of it. |
| 7 | WP | input | Write protect: tied to GND allows normal read/write to the full array, while tied to VCC inhibits all write operations and reads remain possible. |
| 8 | VCC | power_in | Power supply, specified 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 |
|---|---|---|---|---|---|---|---|
| Input/Output Capacitance (SDA) | CI/O |  |  | 8 | pF | VI/O = 0V | 5 |
| Input Capacitance (A1, A2, SCL) | CIN |  |  | 6 | pF | VIN = 0V | 5 |
| Supply Current Read | ICC1 |  | 0.4 | 1 | mA | VCC = 5.0V Read at 400kHz | 5 |
| Supply Current Write | ICC2 |  | 2 | 3 | mA | VCC = 5.0V Write at 400kHz | 5 |
| Standby Current | ISB1 |  |  | 1 | μA | VCC = 1.7V VIN = VCC or VSS | 5 |
| Standby Current | ISB2 |  |  | 6 | μA | VCC = 5.5V VIN = VCC or VSS | 5 |
| Input Leakage Current | ILI |  | 0.1 | 3 | μA | VIN = VCC or VSS | 5 |
| Output Leakage Current | ILO |  | 0.05 | 3 | μA | VOUT = VCC or VSS | 5 |
| Supply Voltage | VCC | 1.7 |  | 5.5 | V |  | 5 |
| Input Low Level | VIL | -0.6 |  |  | V |  | 5 |
| Output Low Level | VOL1 |  |  | 0.2 | V | VCC = 1.7V IOL = 0.15mA | 5 |
| Output Low Level | VOL2 |  |  | 0.4 | V | VCC = 3.0V IOL = 2.1mA | 5 |
| Clock Frequency, SCL | fSCL |  |  | 400 | kHz | VCC = 1.7V | 6 |
| Clock Frequency, SCL | fSCL |  |  | 1000 | kHz | VCC = 2.5V, 5.0V | 6 |
| Clock Pulse Width Low | tLOW | 1.2 |  |  | μs | VCC = 1.7V | 6 |
| Clock Pulse Width Low | tLOW | 0.4 |  |  | μs | VCC = 2.5V, 5.0V | 6 |
| Clock Pulse Width High | tHIGH | 0.6 |  |  | μs | VCC = 1.7V | 6 |
| Clock Pulse Width High | tHIGH | 0.4 |  |  | μs | VCC = 2.5V, 5.0V | 6 |
| Noise Suppression Time | tI |  |  | 100 | ns | VCC = 1.7V | 6 |
| Noise Suppression Time | tI |  |  | 50 | ns | VCC = 2.5V, 5.0V | 6 |
| Clock Low to Data Out Valid | tAA | 0.1 |  | 0.9 | μs | VCC = 1.7V | 6 |
| Clock Low to Data Out Valid | tAA | 0.05 |  | 0.55 | μs | VCC = 2.5V, 5.0V | 6 |
| Bus free time before new transmission | tBUF | 1.3 |  |  | μs | VCC = 1.7V | 6 |
| Bus free time before new transmission | tBUF | 0.5 |  |  | μs | VCC = 2.5V, 5.0V | 6 |
| Start Hold Time | tHD.STA | 0.6 |  |  | μs | VCC = 1.7V | 6 |
| Start Hold Time | tHD.STA | 0.25 |  |  | μs | VCC = 2.5V, 5.0V | 6 |
| Start Setup Time | tSU.STA | 0.6 |  |  | μs | VCC = 1.7V | 6 |
| Start Setup Time | tSU.STA | 0.25 |  |  | μs | VCC = 2.5V, 5.0V | 6 |
| Data In Hold Time | tHD.DAT | 0 |  |  | μs | VCC = 1.7V | 6 |
| Data In Setup Time | tSU.DAT | 100 |  |  | ns | VCC = 1.7V | 6 |
| Inputs Rise Time | tR |  |  | 0.3 | μs | VCC = 1.7V | 6 |
| Inputs Fall Time | tF |  |  | 300 | ns | VCC = 1.7V | 6 |
| Inputs Fall Time | tF |  |  | 100 | ns | VCC = 2.5V, 5.0V | 6 |
| Stop Setup Time | tSU.STO | 0.6 |  |  | μs | VCC = 1.7V | 6 |
| Stop Setup Time | tSU.STO | 0.25 |  |  | μs | VCC = 2.5V, 5.0V | 6 |
| Data Out Hold Time | tDH | 50 |  |  | ns | VCC = 1.7V | 6 |
| Write Cycle Time | tWR |  |  | 5 | ms |  | 6 |
| Operating Temperature (industrial, recommended range) | TAI | -40 |  | 85 | °C |  | 5 |
| Operating Temperature |  | -55 |  | 125 | °C |  | 3 |
| Storage Temperature |  | -65 |  | 150 | °C |  | 3 |
| Voltage on any pin with respect to ground |  | -1 |  | 7 | V |  | 3 |
| Maximum Operating Voltage |  |  |  | 6.25 | V |  | 3 |
| DC Output Current |  |  |  | 5 | mA |  | 3 |

## 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 | U = Green, Matte Sn Lead Finish, | 16 |

## CAD (KiCad official)

- Symbol: `AT24CS08-SSHM-T`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `at24cs08-sshm-t-etched.step` / `at24cs08-sshm-t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `at24cs08-sshm-t.step` / `at24cs08-sshm-t.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Microchip Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588881126413123584) (23 pp, sha256 `bea3d32e493cac1b`, retrieved 2026-10-18, tier: lcsc)
- **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/at24cs08-sshm-t-datasheet.pdf)