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MCP23S17T-E/SS

Public Made by Adom

by adom

Microchip I/O Expanders, SSOP-28-208mil. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Ray mcp23s17t-e-ss: renamed from mcp23s17t-e, the part it was built from (MCP23S17T-E/SS); family listed 26d0c63

MCP23S17T-E/SS

Microchip · I/O Expanders · SSOP-28-208mil

MCP23S17T-E from Microchip, 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 PORTB bit 0. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
2 GPB1 bidirectional PORTB bit 1. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
3 GPB2 bidirectional PORTB bit 2. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
4 GPB3 bidirectional PORTB bit 3. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
5 GPB4 bidirectional PORTB bit 4. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
6 GPB5 bidirectional PORTB bit 5. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
7 GPB6 bidirectional PORTB bit 6. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
8 GPB7 bidirectional PORTB bit 7. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
9 VDD power_in Positive supply voltage. Operating range 1.8 V to 5.5 V (industrial) or 4.5 V to 5.5 V (extended, -40 to +125°C). Bypass locally with 0.1 µF.
10 VSS power_in Ground reference (0 V).
11 CS input SPI chip select, active low. Frames a SPI transaction on the MCP23S17.
12 SCK input SPI serial clock input (up to 10 MHz).
13 SI input SPI serial data input (MOSI from host).
14 SO output SPI serial data output (MISO to host). Typically driven only during a read cycle.
15 A0 input Hardware address bit 0. Must be externally tied to VDD or VSS; combined with A1/A2 forms the SPI device address.
16 A1 input Hardware address bit 1. Must be externally tied to VDD or VSS.
17 A2 input Hardware address bit 2. Must be externally tied to VDD or VSS; up to 8 devices share the bus.
18 RESET input Hardware reset, active low. Must be tied high (or driven high) for normal operation; asserting low returns all registers to POR defaults.
19 INTB output Interrupt output for PORTB. Configurable as active-high, active-low, or open-drain (via IOCON register).
20 INTA output Interrupt output for PORTA. Configurable as active-high, active-low, or open-drain; can be mirrored with INTB.
21 GPA0 bidirectional PORTA bit 0. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
22 GPA1 bidirectional PORTA bit 1. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
23 GPA2 bidirectional PORTA bit 2. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
24 GPA3 bidirectional PORTA bit 3. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
25 GPA4 bidirectional PORTA bit 4. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
26 GPA5 bidirectional PORTA bit 5. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
27 GPA6 bidirectional PORTA bit 6. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.
28 GPA7 bidirectional PORTA bit 7. Bidirectional I/O pin with optional interrupt-on-change and internal weak pull-up.

Key specifications

Parameter Value
Manufacturer Microchip
Package SSOP-28-208mil
Category Interface
Pins 28

Ordering variants

Same part, different packaging or reel option.

  • MCP23S17T-EE/SO
  • MCP23S17T-E/SO
  • MCP23S17T-EE/SS
  • MCP23S17T-E/SS
  • MCP23S17T-EE/P
  • MCP23S17T-E/P
  • MCP23S17T-EE/ML
  • MCP23S17T-E/ML

CAD (KiCad official)

  • Symbol: MCP23S17T-E
  • Footprint: Package_SO:SSOP-28_5.3x10.2mm_P0.65mm
  • 3D model: SSOP-28-208mil (KiCad packages3D, STEP)
  • 3D model files: mcp23s17t-e-etched.step / mcp23s17t-e-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mcp23s17t-e.step / mcp23s17t-e.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
mcp23s17t-e.step 362 KB You want the bare part, or you mark your own boards.
mcp23s17t-e-etched.step 3.0 MB You want the part with MCP23S17T-E already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 759 faces against 447 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

  • Datasheet: Microchip datasheet (48 pp, sha256 0d23e5d2e71a68cd, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

Other parts in this family

This page is MCP23S17T-E/SS. These part numbers share its family name but are different parts (another package, rating or grade), each with its own page:

  • MCP23S17T-E/ML
  • MCP23S17T-E/SO