⚡ Install this component

Paste this into Claude Code (VS Code panel, Adom editor, or terminal) to install:

Search the Adom Wiki for the library component "MCP23017" (slug: mcp23017) at https://wiki-ufypy5dpx93o.adom.cloud/wiki/libraries/mcp23017. Pull down the KiCad symbol, footprint, and 3D model files from the wiki page's assets. Install them into my current KiCad project and register in sym-lib-table and fp-lib-table. If the page has a datasheet URL, save that too.

Manufacturer Microchip

Package DIP-28

Pins 28 pins (Port A, Port B, I2C, Interrupt, Config, Power)

I/O 16 GPIO (2 ports)

Interface I2C (1.7MHz)

Addresses 8 (via A0-A2)

Interrupts 2 (one per port)

Library View

Interactive symbol, footprint, and 3D model — hover pins for cross-highlighting.

SymbolGenerated Generated from pin data (KiCad symbol Interface_Expansion/MCP23017_SO is multi-unit)

FootprintKiCad KiCad standard library: Package_SO/SOIC-28W_7.5x17.9mm_P1.27mm

3DGenerated Generated pad visualization (Babylon.js)

Breakout Board

Auto-generated breakout molecule for MCP23017 — all pins brought to 2mm-pitch headers with 4 corner machine pins on 8mm grid.

Pricing & Availability

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Check Availability / Request Quote

DigiKey Not available

JLCPCB Not available

Specifications

I/O	16 GPIO (2 ports)
Interface	I2C (1.7MHz)
Addresses	8 (via A0-A2)
Interrupts	2 (one per port)
Supply	1.8V-5.5V
Package	SOIC-28

Pin Configuration

Port APort BI2CInterruptConfigPower

Pin	Name	Group	Function
Port A — GPIO port A (GPA0-GPA7)
21	GPA0	Port A	Port A bit 0
22	GPA1	Port A	Port A bit 1
23	GPA2	Port A	Port A bit 2
24	GPA3	Port A	Port A bit 3
25	GPA4	Port A	Port A bit 4
26	GPA5	Port A	Port A bit 5
27	GPA6	Port A	Port A bit 6
28	GPA7	Port A	Port A bit 7
Port B — GPIO port B (GPB0-GPB7)
1	GPB0	Port B	Port B bit 0
2	GPB1	Port B	Port B bit 1
3	GPB2	Port B	Port B bit 2
4	GPB3	Port B	Port B bit 3
5	GPB4	Port B	Port B bit 4
6	GPB5	Port B	Port B bit 5
7	GPB6	Port B	Port B bit 6
8	GPB7	Port B	Port B bit 7
I2C — I2C interface
11	NC	I2C	No connection
12	SCL	I2C	I2C clock
13	SDA	I2C	I2C data
14	NC	I2C	No connection
Interrupt — Interrupt outputs
18	RESET	Interrupt	Reset (active low)
19	INTB	Interrupt	Interrupt for port B
Config — Address and reset
15	A0	Config	Address select A0
16	A1	Config	Address select A1
17	A2	Config	Address select A2
20	INTA	Config	Interrupt for port A
Power — Supply and ground
9	VDD	Power	Supply voltage (1.8V-5.5V)
10	VSS	Power	Ground

AI Skill Technical Reference

Edit AI Skill

MCP23017 — 16-bit I2C I/O expander, DIP-28

Manufacturer: Microchip Package: DIP-28

Description

The MCP23017 is a 16-bit I/O expander with I2C interface from Microchip. Provides 16 additional GPIO pins configurable as input or output with interrupt capability. Up to 8 devices on one bus (128 extra GPIOs).

Electrical Specifications

I/O: 16 GPIO (2 ports)
Interface: I2C (1.7MHz)
Addresses: 8 (via A0-A2)
Interrupts: 2 (one per port)
Supply: 1.8V-5.5V
Package: SOIC-28

Pin Configuration

Package: DIP-28

Pin 1: GPB0 — Port B bit 0
Pin 2: GPB1 — Port B bit 1
Pin 3: GPB2 — Port B bit 2
Pin 4: GPB3 — Port B bit 3
Pin 5: GPB4 — Port B bit 4
Pin 6: GPB5 — Port B bit 5
Pin 7: GPB6 — Port B bit 6
Pin 8: GPB7 — Port B bit 7
Pin 9: VDD — Supply voltage (1.8V-5.5V)
Pin 10: VSS — Ground
Pin 11: NC — No connection
Pin 12: SCL — I2C clock
Pin 13: SDA — I2C data
Pin 14: NC — No connection
Pin 15: A0 — Address select A0
Pin 16: A1 — Address select A1
Pin 17: A2 — Address select A2
Pin 18: RESET — Reset (active low)
Pin 19: INTB — Interrupt for port B
Pin 20: INTA — Interrupt for port A
Pin 21: GPA0 — Port A bit 0
Pin 22: GPA1 — Port A bit 1
Pin 23: GPA2 — Port A bit 2
Pin 24: GPA3 — Port A bit 3
Pin 25: GPA4 — Port A bit 4
Pin 26: GPA5 — Port A bit 5
Pin 27: GPA6 — Port A bit 6
Pin 28: GPA7 — Port A bit 7

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0 revisions · Updated 2026-03-02 17:31:36