component
MCP23S17-E
Public Made by Adomby adom
Microchip Tech I/O Expanders, SSOP-28-208mil. Datasheet-verified pinout, 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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README
markdownMCP23S17-E
Microchip Tech · I/O Expanders · SSOP-28-208mil
MCP23S17-E from Microchip Tech, in a SSOP-28-208mil. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GPB0 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 2 | GPB1 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 3 | GPB2 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 4 | GPB3 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 5 | GPB4 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 6 | GPB5 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 7 | GPB6 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 8 | GPB7 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 9 | VDD | power_in | Positive power supply voltage, rated 1.8 V to 5.5 V. |
| 10 | VSS | power_in | Ground reference. |
| 11 | CS | input | Chip Select input for SPI interface. |
| 12 | SCK | input | Serial clock input for SPI interface. |
| 13 | SI | input | Serial data input for SPI interface. |
| 14 | SO | output | Serial data output for SPI interface. |
| 15 | A0 | input | Hardware address pin; must be externally biased. |
| 16 | A1 | input | Hardware address pin; must be externally biased. |
| 17 | A2 | input | Hardware address pin; must be externally biased. |
| 18 | RESET | input | Hardware reset input; must be externally biased. |
| 19 | INTB | output | Interrupt output for PORTB; can be configured as active-high, active-low or open-drain. |
| 20 | INTA | output | Interrupt output for PORTA; can be configured as active-high, active-low or open-drain. |
| 21 | GPA0 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 22 | GPA1 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 23 | GPA2 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 24 | GPA3 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 25 | GPA4 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 26 | GPA5 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 27 | GPA6 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
| 28 | GPA7 | bidirectional | Bidirectional I/O pin; can be enabled for interrupt-on-change and/or internal weak pull-up resistor. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SSOP-28-208mil |
| Category | Interface |
| Pins | 28 |
CAD (KiCad official)
- Symbol:
MCP23S17-E - Footprint:
Package_SO:SSOP-28_5.3x10.2mm_P0.65mm - 3D model: SSOP-28-208mil (KiCad packages3D, STEP)
- 3D model files:
mcp23s17-e-etched.step/mcp23s17-e-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mcp23s17-e.step/mcp23s17-e.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (42 pp, sha256
14159c6f5655e943, retrieved 2026-09-21, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).