MCP23S18T-E/MJ Microchip Integrated Circuit (Quad Flat No-Lead) In Stock

Name: MCP23S18T-E/MJ
Brand: Microchip
SKU: MCP23S18T-E/MJ
Availability: InStock

Microchip MCP23S18T-E/MJ is a 16-bit SPI I/O expander with 16 GPIO lines across 2 ports, running up to 10 MHz. Features open-drain interrupt outputs and 25 mA sink capability per pin. Ideal for embedded systems needing extra GPIO via a simple 4-wire SPI bus.

ACTIVEIntegrated CircuitVerified Jun 2026

Package / Visual Reference

MCP23S18T-E/MJQuad Flat No-Lead

Quick Facts

Manufacturer: Microchip
Package: Quad Flat No-Lead
Pin Count: 24
Lifecycle: ACTIVE
Datasheet: MCP23S18T-E/MJ Datasheet PDF
Category: Integrated Circuit
Price: From $1.5600(MOQ 1)
Temp Range: -40.0°C to 125.0°C
RoHS: Compliant
Lead Time: 3–7 business days
Shipping: DHL Express · Worldwide

What are the key features of MCP23S18T-E/MJ?

16-bit SPI I/O expansion with 2 independent 8-bit ports
SPI interface up to 10 MHz clock frequency
Open-drain interrupt-on-change outputs for both ports
25 mA sink current per I/O pin
24-pin QFN package for compact PCB layouts
Cascadable up to 8 devices on a single SPI bus

What is MCP23S18T-E/MJ used for?

The MCP23S18T-E/MJ is widely used in embedded control systems, industrial automation, and IoT devices where the host microcontroller has insufficient GPIO. Typical designs include keyboard matrix interfaces, LED panel control, sensor array multiplexing, and relay-bank management boards.

What are the specifications of MCP23S18T-E/MJ?

Manufacturer Package Code	QFN-24
Factory Lead Time	6Weeks
YTEOL	9
Clock Frequency-Max	10MHz
JESD-30 Code	S-PQCC-N24
JESD-609 Code	e3
Number of Bits	16
Number of I/O Lines	16
Number of Ports	2
Package Body Material	PLASTIC/EPOXY
Package Equivalence Code	LCC24,.16SQ,20
Package Shape	SQUARE
Package Style	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Cel)	260
Qualification Status	Not Qualified
Supply Current-Max	1mA
Supply Voltage-Max	5.5V
Supply Voltage-Min	1.8V
Supply Voltage-Nom	5V
Surface Mount	YES
Technology	CMOS
Temperature Grade	AUTOMOTIVE
Terminal Finish	Matte Tin (Sn)
Terminal Form	NO LEAD
Terminal Pitch	0.5mm
Terminal Position	QUAD
Time@Peak Reflow Temperature-Max (s)	40
uPs/uCs/Peripheral ICs Type	PARALLEL IO PORT, GENERAL PURPOSE
Package	Quad Flat No-Lead

Compliance & Regulatory

RoHS Status	Compliant
Lead-Free	Yes (Pb-Free)
Moisture Sensitivity Level	MSL 1
ECCN	EAR99
HTS Code	8542.39.00.01
Country of Origin	Thailand

Where can I find the MCP23S18T-E/MJ datasheet?

MCP23S18T-E/MJ Datasheet Download

Official datasheet from Microchip

What are equivalent replacements for MCP23S18T-E/MJ?

Compatible alternatives and drop-in replacements for MCP23S18T-E/MJ:

MCP23S18-E/MJMicrochip Technology Inc Parallel I/O Port,

16-Bit, 16 I/O, CMOS, PQCC24

View Part →

Compare all alternatives & request quotes →

Frequently Asked Questions

How many GPIO lines can the MCP23S18T-E/MJ provide, and how are they organized?

The MCP23S18T-E/MJ provides 16 GPIO lines organized into 2 independent 8-bit ports (PORTA and PORTB). Each port can be individually configured as input or output, and each pin supports up to 25 mA sink current, making it suitable for driving LEDs or relays directly.

What SPI clock speed does MCP23S18T-E/MJ support, and how many devices can share the same bus?

The MCP23S18T-E/MJ supports SPI clock frequencies up to 10 MHz. Up to 8 devices can be cascaded on a single SPI bus using hardware address pins, allowing expansion to 128 GPIO lines from one host interface without additional bus arbitration logic.

Is MCP23S18T-E/MJ suitable for a design requiring open-drain interrupt outputs for multiple events?

Yes. The MCP23S18T-E/MJ features two open-drain interrupt output pins, one per 8-bit port, which can be mirrored and configured for interrupt-on-change. This allows a single host MCU interrupt pin to service all 16 I/O lines, reducing GPIO overhead in event-driven designs.

What package does the MCP23S18T-E/MJ use and what are the key procurement considerations?

The MCP23S18T-E/MJ is supplied in a 24-pin QFN package with a typical factory lead time of 6 weeks. The T suffix indicates tape-and-reel packaging suitable for automated SMT assembly. Buyers should confirm RoHS compliance (JESD-609 code e3 indicates Pb-free) and check stock for volume orders.

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Reference Price (USD)

From $1.5600

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Qty.	Unit Price	Ext. Price
1+	$1.5846	$1.58
1000+	$1.5700	$1570.00
5000+	$1.5600	$7800.00

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Unit price: $1.5846 · Total: $1.58

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MCP23S18T-E/MJ Microchip Integrated Circuit (Quad Flat No-Lead) In Stock

What are the key features of MCP23S18T-E/MJ?

What is MCP23S18T-E/MJ used for?

What are the specifications of MCP23S18T-E/MJ?

Compliance & Regulatory

Where can I find the MCP23S18T-E/MJ datasheet?

What are equivalent replacements for MCP23S18T-E/MJ?

Frequently Asked Questions

How many GPIO lines can the MCP23S18T-E/MJ provide, and how are they organized?

What SPI clock speed does MCP23S18T-E/MJ support, and how many devices can share the same bus?

Is MCP23S18T-E/MJ suitable for a design requiring open-drain interrupt outputs for multiple events?

What package does the MCP23S18T-E/MJ use and what are the key procurement considerations?

Related Guides

CSD87313DMS Synchronous Buck Power Stage Design Guide

STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection

C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC

STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security

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