# 23A256-I

**Microchip Tech** · Pre-ordered MCUs · SOIC-8

23A256-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, a high level deselects it and forces Standby mode with SO high-impedance. |
| 2 | SO | tri_state | Serial Data Output; data is shifted out after the falling edge of SCK and the pin goes high-impedance when the device is deselected or held. |
| 3 | NC | unconnected | No connect; pin 3 is shown as NC in the package diagram and is not listed in the pin function table. |
| 4 | VSS | power_in | Ground. |
| 5 | SI | input | Serial Data Input that receives instructions, addresses and data, latched on the rising edge of SCK. |
| 6 | SCK | input | Serial Clock input that synchronizes host communication, with SI latched on the rising edge and SO updated after the falling edge, up to 20 MHz maximum clock. |
| 7 | HOLD | input | Hold input that pauses serial communication without resetting the sequence when pulled low while SCK is low, and must be held high when not in use. |
| 8 | VCC | power_in | Supply voltage, 1.5V to 1.95V for the 23A256 (absolute maximum 4.5V). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOIC-8 |
| Category | Embedded Processors & Controllers |
| 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 | 1.5 |  | 1.95 | V | 23A256 (I-Temp) | 2 |
| Low-Level Output Voltage | VOL |  |  | 0.2 | V | IOL = 1 mA | 2 |
| Input Leakage Current | ILI | -0.5 |  | 0.5 | µA | CS = VCC, VIN = VSS OR VCC | 2 |
| Output Leakage Current | ILO | -0.5 |  | 0.5 | µA | CS = VCC, VOUT = VSS OR VCC | 2 |
| Read Operating Current | ICC |  |  | 3 | mA | FCLK = 1 MHz; SO = O | 2 |
| Read Operating Current | ICC |  |  | 6 | mA | FCLK = 10 MHz; SO = O | 2 |
| Standby Current | ICCS |  | 0.2 | 1 | µA | CS = VCC = 1.8V, Inputs tied to VCC or VSS | 2 |
| Input Capacitance | CINT |  |  | 7 | pF | VCC = 0V, f = 1 MHz, Ta = +25°C (Note 1) | 2 |
| RAM Data Retention Voltage | VDR |  | 1.2 |  | V | Note 2 | 2 |
| Clock Frequency | FCLK |  |  | 10 | MHz | VCC ≥ 1.5V (I-Temp) | 3 |
| Clock Frequency | FCLK |  |  | 16 | MHz | VCC ≥ 1.8V (I-Temp) | 3 |
| CS Setup Time | TCSS | 50 |  |  | ns | VCC ≥ 1.5V (I-Temp) | 3 |
| CS Setup Time | TCSS | 32 |  |  | ns | VCC ≥ 1.8V (I-Temp) | 3 |
| CS Hold Time | TCSH | 50 |  |  | ns | VCC ≥ 1.5V (I-Temp) | 3 |
| CS Disable Time | TCSD | 50 |  |  | ns | VCC ≥ 1.5V (I-Temp) | 3 |
| CS Disable Time | TCSD | 32 |  |  | ns | VCC ≥ 1.8V (I-Temp) | 3 |
| Data Setup Time | Tsu | 10 |  |  | ns | VCC ≥ 1.5V (I-Temp) | 3 |
| Data Hold Time | THD | 10 |  |  | ns | VCC ≥ 1.5V (I-Temp) | 3 |
| CLK Rise Time | TR |  |  | 2 | us | Note 1 | 3 |
| CLK Fall Time | TF |  |  | 2 | us | Note 1 | 3 |
| Clock High Time | THI | 50 |  |  | ns | VCC ≥ 1.5V (I-Temp) | 3 |
| Clock High Time | THI | 32 |  |  | ns | VCC ≥ 1.8V (I-Temp) | 3 |
| Clock Low Time | TLO | 50 |  |  | ns | VCC ≥ 1.5V (I-Temp) | 3 |
| Clock Low Time | TLO | 32 |  |  | ns | VCC ≥ 1.8V (I-Temp) | 3 |
| Clock Delay Time | TCLD | 50 |  |  | ns | VCC ≥ 1.5V (I-Temp) | 3 |
| Clock Delay Time | TCLD | 32 |  |  | ns | VCC ≥ 1.8V (I-Temp) | 3 |
| Output Valid from Clock Low | TV |  |  | 50 | ns | VCC ≥ 1.5V (I-Temp) | 4 |
| Output Valid from Clock Low | TV |  |  | 32 | ns | VCC ≥ 1.8V (I-Temp) | 4 |
| Output Hold Time | THO | 0 |  |  | ns | Note 1 | 4 |
| Output Disable Time | TDIS |  |  | 20 | ns | VCC ≥ 1.5V (I-Temp) | 4 |
| HOLD Setup Time | THS | 10 |  |  | ns |  | 4 |
| HOLD Hold Time | THH | 10 |  |  | ns |  | 4 |
| HOLD Low to Output High-Z | THZ | 10 |  |  | ns |  | 4 |
| HOLD High to Output Valid | THV |  |  | 50 | ns |  | 4 |
| Input/Output Voltage w.r.t. VSS (lower limit) |  | -0.3 |  |  | V | All inputs and outputs w.r.t. VSS; upper limit VCC +0.3V | 2 |
| Storage Temperature |  | -65 |  | 150 | °C |  | 2 |
| Ambient Temperature Under Bias |  | -40 |  | 125 | °C |  | 2 |
| ESD Protection on All Pins |  |  |  | 2 | kV |  | 2 |
| Operating Temperature, Industrial | TA | -40 |  | 85 | °C | Industrial (I) | 2 |

## 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 | 17 |

## CAD (KiCad official)

- Symbol: `23A256-I`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `23a256-i-etched.step` / `23a256-i-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `23a256-i.step` / `23a256-i.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/23a256-i-datasheet.pdf) (27 pp, sha256 `1a538f1a3d69c987`, retrieved 2026-10-23, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/23a256-i-datasheet.pdf)