MCP23S09T-E/MG Microchip Integrated Circuit (Quad Flat No-Lead) In Stock
Microchip MCP23S09T-E/MG is an 8-bit SPI-controlled I/O expander with 8 bidirectional GPIO pins. It operates up to 10 MHz SPI clock, features interrupt output, and is housed in a compact QFN-16 package for space-constrained PCB designs.
- Manufacturer
- Microchip
- Package
- Quad Flat No-Lead
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- MCP23S09T-E/MG Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-bit GPIO expander with SPI interface running up to 10 MHz
- Single port with 8 fully bidirectional I/O lines and configurable pull-ups
- Hardware address pin for multi-device SPI bus sharing
- Interrupt-on-change output for efficient microcontroller event handling
- Compact QFN-16 package enabling high-density board layouts
Applications
The MCP23S09T-E/MG is commonly used in industrial control panels, embedded systems, and consumer electronics where the host microcontroller lacks sufficient GPIO pins. Its SPI interface at up to 10 MHz makes it suitable for real-time I/O expansion in robotics, keypad matrix scanning, relay-bank control, and LED status indicator arrays.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | QFN-16 |
| Factory Lead Time | 8Weeks |
| YTEOL | 9 |
| Clock Frequency-Max | 10MHz |
| JESD-30 Code | S-XQCC-N16 |
| JESD-609 Code | e3 |
| Number of Bits | 8 |
| Number of I/O Lines | 8 |
| Number of Ports | 1 |
| Package Body Material | UNSPECIFIED |
| Package Equivalence Code | LCC16,.12SQ,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 MCP23S09T-E/MG:
Frequently Asked Questions
How fast is the SPI interface on the MCP23S09T-E/MG, and does that limit real-time I/O update rates?
The MCP23S09T-E/MG supports SPI clock rates up to 10 MHz, allowing a host MCU to read or write all 8 I/O lines in a single 24-bit transaction in under 3 µs. This speed is sufficient for most keypad scanning, LED control, and relay switching applications without introducing noticeable latency.
How many MCP23S09T-E/MG devices can share the same SPI bus, and what differentiates them?
Up to 2 MCP23S09T-E/MG devices can share a single SPI bus by using the hardware address bit (A0 pin), giving a total of 16 additional GPIO outputs without adding a bus multiplexer. Each device is selected independently via its unique 1-bit address encoded in the SPI opcode byte.
What are the key differences between MCP23S09T-E/MG and the I2C version MCP23009 for a new board design?
The MCP23S09T-E/MG uses SPI at up to 10 MHz versus the MCP23009's I2C at up to 400 kHz, making the SPI variant roughly 25x faster per transaction. Designers choose the SPI version when the host already has an SPI bus or when update rates exceed I2C limits, while I2C suits simpler 2-wire wiring topologies.
Is the MCP23S09T-E/MG RoHS compliant and what moisture sensitivity level applies to the QFN-16 package?
Yes, the MCP23S09T-E/MG carries a RoHS and lead-free (Pb-free) rating as indicated by its JESD-609 code e3. The QFN-16 package is rated MSL 3, requiring dry storage and baking if the moisture barrier bag has been open longer than 168 hours before SMT reflow assembly.
Which embedded applications benefit most from adding MCP23S09T-E/MG as an I/O expander?
Applications that benefit most include industrial PLCs with 8 or more discrete sensor inputs, LED indicator panels requiring 8 independently controlled channels, and relay-driver boards where the host MCU has fewer than 8 available GPIO pins. The interrupt-on-change output further reduces CPU polling overhead in event-driven firmware designs.
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