MCP23S17-E/SP Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
The MCP23S17-E/SP is a 16-bit SPI I/O expander offering 16 configurable GPIO lines with interrupt-on-change, operating at up to 10 MHz SPI clock in a 28-pin SPDIP package, ideal for expanding microcontroller I/O.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 28
- Lifecycle
- ACTIVE
- Datasheet
- MCP23S17-E/SP Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.6947(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 MCP23S17-E/SP?
- 16 individually configurable GPIO lines organized as two 8-bit ports, each pin selectable as input or output with optional internal 100 kΩ pull-up resistors
- High-speed SPI interface operating up to 10 MHz, supporting multiple devices on a single bus via 3-bit hardware address pins for up to 8 devices
- Interrupt-on-change outputs (INTA/INTB) per port enable efficient event-driven designs without continuous polling by the host microcontroller
- Wide supply range of 1.8 V to 5.5 V and -40°C to +125°C extended temperature grade for robust industrial and automotive-adjacent applications
What is MCP23S17-E/SP used for?
The MCP23S17-E/SP is a practical GPIO expander for microcontrollers with limited I/O, enabling control of up to 16 additional digital lines—such as relay drivers, LED matrices, pushbutton arrays, or multiplexed sensors—over a single 4-wire SPI bus. Its interrupt output and daisy-chainable address pins make it well suited for industrial PLCs, human-machine interface panels, and embedded systems requiring scalable I/O expansion without additional microcontrollers.
What are the specifications of MCP23S17-E/SP?
| Pbfree Code | Yes |
| Manufacturer Package Code | SPDIP-28 |
| Factory Lead Time | 6Weeks |
| YTEOL | 8 |
| CPU Family | MCP23X17 |
| 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 | 4.5V |
| 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 |
| ## MCP23S17-E/SP Alternates Showing results | Image |
| 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 MCP23S17-E/SP datasheet?
MCP23S17-E/SP Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP23S17-E/SP?
Compatible alternatives and drop-in replacements for MCP23S17-E/SP:
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Frequently Asked Questions
How many MCP23S17-E/SP devices can share one SPI bus, and how are they addressed?
Up to 8 MCP23S17-E/SP devices can coexist on a single SPI bus. Each device has 3 hardware address pins (A0, A1, A2) that allow unique 3-bit addresses from 0b000 to 0b111, so a designer can expand a microcontroller's I/O by up to 128 additional GPIO lines using only one SPI port.
What SPI clock speed does MCP23S17-E/SP support, and does it work with 3.3 V microcontrollers?
The MCP23S17-E/SP supports SPI clock frequencies up to 10 MHz and operates on supply voltages from 1.8 V to 5.5 V. This makes it directly compatible with 3.3 V and 5 V microcontrollers alike without level-shifting, which simplifies hardware design in mixed-voltage systems commonly found in embedded Linux or Arduino-class boards.
How do the interrupt-on-change outputs work on MCP23S17-E/SP, and how much does this reduce CPU load?
Each of the two 8-bit ports on the MCP23S17-E/SP has a dedicated interrupt output (INTA and INTB) that asserts when any enabled pin changes state. The host can sleep or perform other tasks and wake only on an interrupt, eliminating continuous polling and potentially reducing SPI bus traffic by up to 90% in low-activity I/O scenarios such as button-press detection.
What internal pull-up resistance does MCP23S17-E/SP provide, and when would you disable them?
Each GPIO input pin on the MCP23S17-E/SP can enable an internal pull-up resistor of approximately 100 kΩ via the GPPU register. You would disable these when external precision pull-ups or pull-downs are already fitted, when driving the pins from a low-impedance source, or when the 100 kΩ value is too weak for high-capacitance bus lines running above a few kilohertz.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.6947 | $0.69 |
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