MCP23S17T-E/SS Microchip Integrated Circuit (Small Outline Packages) In Stock
The MCP23S17T-E/SS is a 16-bit SPI-controlled I/O expander in SSOP-28 package, offering 16 independently configurable GPIO pins with interrupt support. It operates up to 10 MHz SPI clock and is ideal for expanding microcontroller I/O capacity. Available with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 28
- Lifecycle
- ACTIVE
- Datasheet
- MCP23S17T-E/SS Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.3090(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 MCP23S17T-E/SS?
- 16 bidirectional I/O pins configurable as input or output independently per pin
- SPI interface operating up to 10 MHz for fast host communication
- Configurable interrupt-on-change per pin to minimize polling overhead
- SSOP-28 package enables compact PCB layout in space-constrained designs
What is MCP23S17T-E/SS used for?
The MCP23S17T-E/SS is widely used in embedded systems where the host microcontroller lacks sufficient GPIO pins, such as industrial control panels, home automation hubs, and keyboard matrix scanning. Its SPI interface and 16 I/O lines allow a single chip to manage LEDs, buttons, relays, and sensor enable lines simultaneously. The SSOP-28 package suits compact PCBs with moderate pin-count requirements.
What are the specifications of MCP23S17T-E/SS?
| Pbfree Code | Yes |
| Manufacturer Package Code | SSOP-28 |
| Factory Lead Time | 6Weeks |
| YTEOL | 8 |
| CPU Family | MCP23X17 |
| Clock Frequency-Max | 10MHz |
| JESD-30 Code | R-PDSO-G28 |
| 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 | SSOP20,.3 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max | 1mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 4.5V |
| Supply Voltage-Nom | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| uPs/uCs/Peripheral ICs Type | PARALLEL IO PORT, GENERAL PURPOSE |
| ## MCP23S17T-E/SS Alternates Showing results | Image |
| Package | Small Outline Packages |
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 | Philippines, Thailand |
Where can I find the MCP23S17T-E/SS datasheet?
MCP23S17T-E/SS Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP23S17T-E/SS?
Compatible alternatives and drop-in replacements for MCP23S17T-E/SS:
suggested
suggested
Frequently Asked Questions
How many GPIO pins does MCP23S17T-E/SS provide and how are they configured?
The MCP23S17T-E/SS provides 16 bidirectional I/O pins organized in two 8-bit ports (PORTA and PORTB). Each pin is individually configurable as input or output via SPI registers, and each has an optional internal pull-up resistor, giving designers fine-grained control over 16 lines with a single device.
What is the maximum SPI clock frequency supported by MCP23S17T-E/SS?
The MCP23S17T-E/SS supports SPI clock frequencies up to 10 MHz, enabling rapid I/O register updates with minimal latency. This speed is sufficient to refresh all 16 outputs or read all 16 inputs in under 5 µs at full clock rate, keeping real-time control loops responsive.
Can MCP23S17T-E/SS generate interrupts, and how does this benefit embedded designs?
Yes, the MCP23S17T-E/SS features configurable interrupt-on-change on all 16 inputs, routed to two dedicated INTA and INTB output pins. This allows the host microcontroller to remain idle until an input changes, reducing CPU polling overhead and enabling efficient event-driven firmware for button presses or sensor triggers.
For a 28-pin SSOP footprint, what are the board-space implications of using MCP23S17T-E/SS?
The SSOP-28 package has a lead pitch of 0.65 mm and an overall body width of approximately 5.3 mm, allowing placement in compact PCB areas. Compared to a DIP-28 alternative, it uses roughly 60% less board area, making it suitable for space-constrained handheld or IoT device designs.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.3090 | $1.31 |
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