MCP23S18-E/SP Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
Microchip MCP23S18-E/SP is a 16-bit SPI-interfaced I/O expander with two 8-bit GPIO ports, operating up to 10 MHz clock frequency. It features configurable interrupt outputs and programmable pull-ups on all 16 I/O lines, expanding microcontroller GPIO in embedded systems. Available in a 28-pin SPDIP package for through-hole prototyping and industrial applications.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 28
- Lifecycle
- ACTIVE
- Datasheet
- MCP23S18-E/SP Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.3100(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 MCP23S18-E/SP?
- 16-bit I/O expansion with two independent 8-bit ports via SPI interface
- Up to 10 MHz SPI clock frequency for fast peripheral control
- Configurable interrupt-on-change output for event-driven system design
- Programmable internal pull-up resistors on all 16 I/O lines
- 28-pin SPDIP through-hole package supporting prototyping and robust industrial assemblies
- Pb-free and RoHS-compliant (JESD-609 Code e3)
What is MCP23S18-E/SP used for?
MCP23S18-E/SP is used in microcontroller-based systems that require additional GPIO, such as industrial control panels, keypad matrix scanning, and LED display driving over a fast SPI bus. It is also applied in home automation gateways, robotics, and data acquisition boards where expanding the I/O count of a host MCU by 16 bits is critical.
What are the specifications of MCP23S18-E/SP?
| Pbfree Code | Yes |
| Manufacturer Package Code | SPDIP-28 |
| Factory Lead Time | 6Weeks |
| YTEOL | 9 |
| Clock Frequency-Max | 10MHz |
| JESD-30 Code | R-PDIP-T28 |
| 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 | DIP28,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Supply Current-Max | 1mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 1.8V |
| Supply Voltage-Nom | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| uPs/uCs/Peripheral ICs Type | PARALLEL IO PORT, GENERAL PURPOSE |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Where can I find the MCP23S18-E/SP datasheet?
MCP23S18-E/SP Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP23S18-E/SP?
Compatible alternatives and drop-in replacements for MCP23S18-E/SP:
Frequently Asked Questions
How many additional I/O lines does MCP23S18-E/SP add to an MCU, and what SPI clock rate does it support?
MCP23S18-E/SP expands a microcontroller's I/O by 16 lines organized as two independent 8-bit ports, all accessible via SPI at up to 10 MHz clock frequency. This allows a host MCU with limited GPIO to control 16 external signals such as relay drivers, LED arrays, or button matrices without consuming more than a few SPI pins.
Can MCP23S18-E/SP generate interrupts to wake a low-power MCU when an input changes state?
Yes, MCP23S18-E/SP supports interrupt-on-change functionality on all 16 input pins, producing a configurable active-low or active-high interrupt output. When any monitored pin changes state, the interrupt line alerts the host MCU, enabling event-driven designs that keep the processor in sleep mode until a relevant 16-bit I/O event occurs.
What through-hole package does MCP23S18-E/SP use, and how does it compare to surface-mount I/O expander alternatives?
MCP23S18-E/SP is packaged in a 28-pin SPDIP (JESD-30 Code R-PDIP-T28), a through-hole format suited for prototyping boards, socketed industrial modules, and repair-friendly assemblies. Designers needing a smaller SMT footprint may prefer the MCP23S18 in SSOP-28, while the SPDIP variant is preferred for breadboard development and rugged through-hole PCB builds.
Is MCP23S18-E/SP compliant with RoHS, and what is its typical factory lead time for volume procurement?
MCP23S18-E/SP is Pb-free and carries JESD-609 Code e3, confirming full RoHS compliance. Its factory lead time is approximately 6 weeks, and a projected YTEOL of 9 years makes it a reliable long-term procurement choice for industrial and embedded designs requiring 16-bit SPI I/O expansion in a 28-pin through-hole package.
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