MCP23S18T-E/MJ Microchip Integrated Circuit (Quad Flat No-Lead) In Stock
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.
- 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
Key Features
- 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
Applications
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.
Specifications
| 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 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for MCP23S18T-E/MJ:
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.
Related Guides
How to Choose a BAS70 Schottky Diode for Signal Clamping: Selection Guide
A practical BAS70KFILM and BAS70-family Schottky diode selection guide for signal clamping, RF detection, leakage, and topology choices.
Jul 4, 2026
AMC1202DWVR Design Guide for Isolated Current Sensing
Practical AMC1202DWVR design guide covering shunt sizing, isolation layout, input filtering, ADC scaling, and sourcing choices.
Jul 4, 2026
1206 100 uF MLCC Design Guide for Compact Bulk Decoupling
Design guidance for applying CL31A107MQHNNNE and related 1206 MLCCs in compact bulk decoupling networks.
Jul 3, 2026
0402 10 nF MLCC Design Guide for High-Speed Decoupling
Practical design guidance for using CL05B103KB5NNNC and related 0402 MLCCs in high-speed decoupling networks.
Jul 3, 2026
Why Buy from FindMyChip
About Microchip
Microchip is a leading electronic component manufacturer. FindMyChip sources Microchip ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.5846 | $1.58 |
| 1000+ | $1.5700 | $1570.00 |
| 5000+ | $1.5600 | $7800.00 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“We've been using FindMyChip for 2 years. Pricing is consistently 20-30% below Mouser/DigiKey for volume orders.”