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MCP23S18-E

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Microchip Tech I/O Expanders, SOIC-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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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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Contents

README

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MCP23S18-E

Microchip Tech · I/O Expanders · SOIC-28-300mil

MCP23S18-E from Microchip Tech, in a SOIC-28-300mil. 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 VSS power_in Ground (high current capable).
2 NC unconnected Not connected.
3 GPB0 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
4 GPB1 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
5 GPB2 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
6 GPB3 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
7 GPB4 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
8 GPB5 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
9 GPB6 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
10 GPB7 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
11 VDD power_in Power supply (high current capable), operating range 1.8V to 5.5V.
12 CS input SPI chip select input.
13 SCK input SPI serial clock input, up to 10 MHz.
14 SI input SPI serial data input.
15 SO output SPI serial data output.
16 RESET input Hardware reset input that must be externally biased.
17 NC unconnected Not connected.
18 INTB output Interrupt output for port B, configurable as active high, active low, or open drain.
19 INTA output Interrupt output for port A, configurable as active high, active low, or open drain.
20 GPA0 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
21 GPA1 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
22 GPA2 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
23 GPA3 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
24 GPA4 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
25 GPA5 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
26 GPA6 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
27 GPA7 bidirectional Bidirectional I/O pin (5.5 volt tolerant input; open-drain output) that can be enabled for interrupt on change and/or internal pull-up resistor.
28 NC unconnected Not connected.

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package SOIC-28-300mil
Category Interface ICs
Pins 28

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 VDD 1.8 5.5 V 34
VDD Rise Rate to Ensure Power-on Reset SVDD 0.05 V/ms Design guidance only. Not tested. 34
Supply Current IDD 1 mA SCL/SCK = 1 MHz 34
Standby (Idle) current IDDS 1 µA -40°C ≤ TA ≤ +85°C 34
Standby (Idle) current IDDS 6 µA +85°C ≤ TA ≤ +125°C 34
Input Low-Voltage CS, GPIO, SCL/SCK, SDA, SI, RESET VIL 0 0.2 V min VSS, max 0.2 VDD (value as fraction of VDD) 34
Input High-Voltage GPIO VIH 5.5 V min 0.8 VDD 34
Input Leakage Current I/O port pins IIL -1 1 µA VSS ≤ VPIN ≤ VDD 34
Output Leakage Current I/O port pins ILO -1 1 µA VSS ≤ VPIN ≤ VDD 34
GPIO internal pull-up current IPU 220 µA VDD = 5V, GP Pins = VSS 34
Output Low-Voltage GPIO VOL 0.6 V IOL = 8.5 mA, VDD = 4.5V (open-drain) 34
Output Low-Voltage INT VOL 0.6 V IOL = 1.6 mA, VDD = 4.5V 34
Output Low-Voltage SO, SDA VOL 0.6 V IOL = 3.0 mA, VDD = 1.8V 34
Output Low-Voltage SDA VOL 0.8 V IOL = 3.0 mA, VDD = 4.5V 34
Capacitive Loading GPIO, SO, INT CIO 50 pF 34
Voltage on VDD with respect to VSS VDD -0.3 7 V 33
Voltage on RESET with respect to VSS -0.3 14 V 33
Voltage on GPIO Pins -0.6 5.5 V 33
Ambient temperature under bias -40 125 °C 33
Storage temperature -65 150 °C 33
Maximum current out of VSS pin 400 mA 33
Maximum current into VDD pin 125 mA 33
SPI Clock Frequency FCLK 10 MHz 1.8V, 5.5V 42
CS Setup Time TCSS 50 ns 42
Clock High Time THI 45 ns 1.8V, 5.5V 42
Output Valid from Clock Low TV 45 ns 1.8V, 5.5V 42
Output Disable Time TDIS 100 ns 42
RESET Pulse Width (low) TRSTL 1 µs VDD = 5.0V 35

CAD (KiCad official)

  • Symbol: MCP23S18-E
  • Footprint: Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm
  • 3D model: SOIC-28-300mil (KiCad packages3D, STEP)
  • 3D model files: mcp23s18-e-etched.step / mcp23s18-e-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mcp23s18-e.step / mcp23s18-e.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (56 pp, sha256 4d2e8ba17e366e46, retrieved 2026-10-27, 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