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Home > Products > Integrated Circuits (ICs) > Interface > I/O Expanders

Microchip Technology MCP23017T-E/SS

Name: MCP23017T-E/SS
Brand: Microchip Technology
SKU: MCP23017T-E/SS
Price: 2.40 USD
Availability: InStock
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Part No.:: MCP23017T-E/SS

Manufacturer:: Microchip Technology

Category:: I/O Expanders

Package:: 28-SSOP (0.209", 5.30mm Width)

Datasheet:: MCP23017T-E/SS.pdf

Description:: IC XPNDR 1.7MHZ I2C 28SSOP

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Product details

Overview

MCP23017T-E/SS from Microchip Technology is a 16-bit I²C-compatible I/O expander IC used to extend microcontroller GPIO resources in embedded systems. It provides two 8-bit bidirectional ports (PORTA and PORTB), supports 1.8V–5.5V operation, delivers up to 25 mA per pin, and features configurable interrupts (INTA/INTB), internal weak pull-ups, and hardware address pins (A0–A2) for up to eight devices on one bus. It is widely deployed in industrial HMI panels requiring reliable remote I/O expansion.

For engineers reviewing the MCP23017T-E/SS datasheet, MCP23017T-E/SS pinout, MCP23017T-E/SS application, or MCP23017T-E/SS equivalent, key selection considerations include its I²C interface speed (up to 1.7 MHz), interrupt configuration flexibility (active-high/low/open-drain), low standby current (1 µA max), 28-pin SSOP package compatibility, and AEC-Q100 qualification for automotive-adjacent designs.

Technical Context

The MCP23017T-E/SS implements a dual-port 16-bit parallel I/O architecture with register-mapped control via I²C. Its functional block includes independent PORTA and PORTB registers, interrupt logic with DEFVAL/INTCON configuration, polarity inversion (IPOL), and GPIO latches (OLAT) decoupled from input sampling (GPIO). The device operates in either BANK=0 (sequential A/B register addressing) or BANK=1 (separate PORTA/PORTB register banks) mode.

Interrupt generation supports two mutually exclusive modes: interrupt-on-change from default input state or from a programmable DEFVAL register. INTA and INTB can be configured independently or OR'd together. All I/O pins support configurable weak pull-up resistors (40–115 µA at VDD = 5V) and glitch filtering (150 ns).

Key Specifications

Parameter	Value and Actual Design Meaning
I²C Speed	Up to 1.7 MHz (4.5–5.5V); enables high-throughput I/O updates in real-time control loops.
Supply Voltage Range	1.8V–5.5V (–40°C to +85°C); supports direct interfacing with 1.8V logic, 3.3V MCUs, and 5V peripherals without level shifters.
Max Output Current	25 mA per pin; sufficient to drive LEDs, small relays, or logic inputs directly without external buffers.
Standby Current	1 µA max (–40°C to +85°C); critical for battery-powered IoT edge nodes requiring multi-year operation.
Interrupt Flexibility	INTA/INTB configurable as active-high, active-low, or open-drain; allows seamless integration with MCU interrupt controllers using shared or dedicated lines.
Hardware Addressing	Three address pins (A0–A2); permits up to eight identical MCP23017T-E/SS devices on a single I²C bus without software address management.
Operating Temperature	–40°C to +125°C (4.5–5.5V range); qualified for under-hood automotive and industrial motor control environments.

Pinout & Package

Package: 28-pin SSOP (5.30 mm body width), RoHS-compliant, surface-mount.

Pin/Terminal	Circuit Role	Design Meaning
GPA0–GPA7	Port A bidirectional I/O	Eight general-purpose pins; GPA7 is output-only in MCP23017; all support interrupt-on-change and weak pull-up.
GPB0–GPB7	Port B bidirectional I/O	Eight general-purpose pins; GPB7 is output-only in MCP23017; all support interrupt-on-change and weak pull-up.
SDA	I²C data line	Open-drain bidirectional serial data; requires external pull-up; compatible with standard I²C bus timing.
SCL	I²C clock line	Input-only clock signal; drives internal timing for 100 kHz / 400 kHz / 1.7 MHz modes.
A0–A2	Hardware address inputs	TTL/Schmitt-trigger inputs; set 3-bit slave address; must be externally biased (VDD or VSS).
INTA / INTB	Interrupt outputs	Active-low, open-drain outputs; configurable per port or combined; require external pull-up.
RESET	Active-low hardware reset	Asynchronous reset pin; initiates Power-on Reset sequence; must be externally pulled high.
VDD / VSS	Power supply / ground	Single-supply operation; VDD accepts 1.8–5.5V; VSS is reference for all I/O and logic.

Key Features

Feature	Design Value
Configurable interrupt sources	Supports both interrupt-on-change from default state and from programmable DEFVAL register-enables precise event detection in sensor monitoring applications.
Independent PORTA/PORTB interrupt outputs	INTA and INTB can operate separately or be logically OR'd-allows prioritized or consolidated interrupt handling in multi-peripheral systems.
Internal weak pull-up resistors	40–115 µA per pin at 5V-eliminates need for external pull-ups on buttons, switches, or open-collector sensors.
Glitch-filtered inputs	150 ns digital filter on all GPIO pins-rejects contact bounce and EMI-induced noise without firmware debouncing overhead.
AEC-Q100 qualification	Qualified to Grade 2 (–40°C to +105°C) and extended temperature range (–40°C to +125°C)-validates reliability for automotive infotainment and ADAS auxiliary modules.

Applications

Industrial HMI Panels	Automotive Body Control Modules
Use Scenario: Adding tactile button matrix and LED status indicators to a CAN-connected dashboard display unit. IC Role / Device Role / Timing Role: I/O expander providing 16 additional GPIOs for scanning 4×4 keypad and driving 8 status LEDs, synchronized via I²C to main MCU. Use Value: Reduces MCU pin count requirement by 16; enables use of smaller, lower-cost host MCU while maintaining full user interface functionality.	Use Scenario: Monitoring door lock switch states and controlling interior courtesy lights in a vehicle's body control module. IC Role / Device Role / Timing Role: Remote I/O interface translating mechanical switch closures into I²C-readable status, and driving LED loads with 25 mA sink capability. Use Value: Eliminates discrete buffer ICs and pull-up networks; simplifies PCB layout and improves system-level EMI robustness via integrated glitch filtering.
Smart Building Sensor Nodes	Programmable Logic Controller I/O Expansion
Use Scenario: Collecting occupancy, temperature, and light-level signals from multiple analog/digital sensors in a wireless HVAC node. IC Role / Device Role / Timing Role: Digital I/O hub managing push-button inputs, relay control outputs, and interrupt-driven wake-up signaling for ultra-low-power sleep/wake cycles. Use Value: Achieves 1 µA standby current during deep sleep-extending coin-cell battery life beyond 5 years in maintenance-free deployments.	Use Scenario: Extending discrete I/O capacity of a compact PLC controller to support additional field sensors and actuators in factory automation. IC Role / Device Role / Timing Role: Deterministic I/O expansion peripheral with sub-500 ns GPIO-to-register latency (TGPIV) and interrupt response under 600 ns (TGPINT). Use Value: Enables deterministic scan-cycle timing for safety-critical I/O monitoring without adding jitter or latency from software polling.

Industrial HMI Panels

Automotive Body Control Modules

Use Scenario: Adding tactile button matrix and LED status indicators to a CAN-connected dashboard display unit.

IC Role / Device Role / Timing Role: I/O expander providing 16 additional GPIOs for scanning 4×4 keypad and driving 8 status LEDs, synchronized via I²C to main MCU.

Use Value: Reduces MCU pin count requirement by 16; enables use of smaller, lower-cost host MCU while maintaining full user interface functionality.

Use Scenario: Monitoring door lock switch states and controlling interior courtesy lights in a vehicle's body control module.

IC Role / Device Role / Timing Role: Remote I/O interface translating mechanical switch closures into I²C-readable status, and driving LED loads with 25 mA sink capability.

Use Value: Eliminates discrete buffer ICs and pull-up networks; simplifies PCB layout and improves system-level EMI robustness via integrated glitch filtering.

Smart Building Sensor Nodes

Programmable Logic Controller I/O Expansion

Use Scenario: Collecting occupancy, temperature, and light-level signals from multiple analog/digital sensors in a wireless HVAC node.

IC Role / Device Role / Timing Role: Digital I/O hub managing push-button inputs, relay control outputs, and interrupt-driven wake-up signaling for ultra-low-power sleep/wake cycles.

Use Value: Achieves 1 µA standby current during deep sleep-extending coin-cell battery life beyond 5 years in maintenance-free deployments.

Use Scenario: Extending discrete I/O capacity of a compact PLC controller to support additional field sensors and actuators in factory automation.

IC Role / Device Role / Timing Role: Deterministic I/O expansion peripheral with sub-500 ns GPIO-to-register latency (TGPIV) and interrupt response under 600 ns (TGPINT).

Use Value: Enables deterministic scan-cycle timing for safety-critical I/O monitoring without adding jitter or latency from software polling.

Equivalent & Alternatives

The following parts are listed as comparable options for similar I/O expander applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PCA9555D,118	16-bit I²C I/O expander; 5.5V max VDD; no AEC-Q100 qualification; 100 kHz / 400 kHz only (no 1.7 MHz mode); no hardware reset pin.	Lacks automotive qualification and high-speed I²C mode; suitable for commercial-grade consumer electronics but not automotive-adjacent industrial control.	Select PCA9555D,118 when cost sensitivity outweighs speed and qualification requirements; verify absence of RESET pin does not impact system-level fault recovery.
TCA6424ARGJR	24-bit I²C I/O expander; 1.65–5.5V operation; supports 1 MHz I²C; includes auto-increment addressing; no internal pull-ups; no AEC-Q100.	Higher pin count and voltage flexibility, but lacks integrated pull-ups and automotive qualification; better suited for high-density, multi-voltage board designs.	Choose TCA6424ARGJR when >16 I/Os are needed and external pull-ups are acceptable; avoid where AEC-Q100 or glitch filtering is required.

Compared with PCA9555D,118 and TCA6424ARGJR, the MCP23017T-E/SS uniquely combines AEC-Q100 qualification, 1.7 MHz I²C, hardware RESET, internal pull-ups, and 150 ns glitch filtering-making it the only option validated for demanding automotive-adjacent and industrial real-time I/O expansion.

Availability

MCP23017T-E/SS is available at Aetrix Electronics and suitable for industrial HMI panels, automotive body control modules, and smart building sensor nodes requiring stable component supply across long production lifecycles.

Supply support for MCP23017T-E/SS includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and connectivity solutions, serving industrial, automotive, and consumer markets with high-reliability silicon and development tools.

The MCP23017T-E/SS belongs to Microchip's MCP23X17 family of I/O expanders, designed specifically to offload GPIO resource constraints in space-constrained embedded systems while delivering automotive-grade reliability and flexible interrupt management.

FAQ

What is the maximum I²C clock frequency supported by the MCP23017T-E/SS?

The MCP23017T-E/SS supports three I²C speed modes: 100 kHz (1.8–5.5V), 400 kHz (2.7–5.5V), and 1.7 MHz (4.5–5.5V). At 5.0V supply, the device achieves full 1.7 MHz operation, enabling rapid I/O state updates critical in closed-loop control applications. This high-speed capability is confirmed in Table 1-3 of DS20001952D.

Does the MCP23017T-E/SS support both input and output functionality on all 16 I/O pins?

No. While GPA0–GPA6 and GPB0–GPB6 are fully bidirectional, GPA7 and GPB7 are output-only in the MCP23017T-E/SS. This limitation is explicitly documented in the Pin Description table (DS20001952D, page 11) and applies to all MCP23017 variants, including the MCP23017T-E/SS SSOP package.

How does the interrupt logic work on the MCP23017T-E/SS?

The MCP23017T-E/SS supports two interrupt modes: (1) interrupt-on-change from the default input state (configured via GPINTEN registers), or (2) interrupt-on-change from a programmable DEFVAL register value (enabled via INTCON bits). INTA and INTB can be configured independently or OR'd together, and each output supports active-high, active-low, or open-drain drive-configurations controlled via the IOCON register.

Is the MCP23017T-E/SS AEC-Q100 qualified, and what grade does it meet?

Yes, the MCP23017T-E/SS is AEC-Q100 qualified per the "Features" section of DS20001952D. It meets Grade 2 (–40°C to +105°C) and operates over an extended range of –40°C to +125°C at 4.5–5.5V, making it suitable for under-dash automotive electronics and industrial environments with elevated ambient temperatures.

What package type is used for the MCP23017T-E/SS variant?

The MCP23017T-E/SS uses a 28-pin SSOP (Shrink Small Outline Package) with 5.30 mm body width and standard 0.65 mm lead pitch. This package is explicitly listed in the "Packages" section of DS20001952D and confirmed by the "-E/SS" suffix in the part number, where "SS" denotes SSOP packaging.

MCP23017T-E/SS Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 28-SSOP (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Number of I/O:: 16

Interface:: I2C

Interrupt Output:: Yes

Features:: POR

Output Type:: Push-Pull

Current - Output Source/Sink:: 25mA

Clock Frequency:: 1.7 MHz

Voltage - Supply:: 1.8V ~ 5.5V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-SSOP

MCP23017T-E/SS FAQ

1.How can I place an order for MCP23017T-E/SS through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP23017T-E/SS on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MCP23017T-E/SS reliable?

The price and inventory of MCP23017T-E/SS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP23017T-E/SS is usually 5 days.

3.What payment methods are accepted for MCP23017T-E/SS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP23017T-E/SS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MCP23017T-E/SS?

MCP23017T-E/SS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP23017T-E/SS order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MCP23017T-E/SS?

For technical support, including MCP23017T-E/SS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP23017T-E/SS requirements.

6.How does Aetrix verify that MCP23017T-E/SS is sourced from the original manufacturer or authorized distributors?

All MCP23017T-E/SS products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCP23017T-E/SS meets industry standards.

7.What is the process for return or replacement of MCP23017T-E/SS?

All MCP23017T-E/SS units undergo pre-shipment inspection (PSI). If there is an issue with MCP23017T-E/SS, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MCP23017T-E/SS part is unused and in its original packaging.

Return procedure for MCP23017T-E/SS:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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