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Microchip Technology MCP23008T-E/SSVAO
- Part No.:
- MCP23008T-E/SSVAO
- Manufacturer:
- Microchip Technology
- Category:
- I/O Expanders
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MCP23008T-E/SSVAO.pdf
- Description:
- IC XPNDR 10MHZ I2C 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,420
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Product details
Overview
MCP23008T-E/SSVAO from Microchip Technology is an 8-bit I²C-compatible GPIO expander IC designed for remote parallel I/O expansion in space-constrained embedded systems. It features 8 bidirectional I/O pins (GP0–GP7), hardware address pins A2–A0 enabling up to eight devices on one I²C bus, configurable interrupt output (INT), and operates from 1.8V to 5.5V across –40°C to +85°C. It is commonly used to extend microcontroller I/O in industrial control panels and sensor interface modules.
For engineers reviewing the MCP23008T-E/SSVAO datasheet, MCP23008T-E/SSVAO pinout, MCP23008T-E/SSVAO application, or MCP23008T-E/SSVAO equivalent, key selection criteria include its I²C interface speed (up to 1.7 MHz), low standby current (1 µA max), interrupt-on-change capability with DEFVAL/INTCON register support, and 20-pin SSOP package compatibility with standard surface-mount assembly processes.
Technical Context
The MCP23008T-E/SSVAO implements a register-mapped I²C slave interface with eleven 8-bit configuration registers (IODIR, IPOL, GPINTEN, DEFVAL, INTCON, IOCON, GPPU, INTF, INTCAP, GPIO, OLAT) accessible via 7-bit slave address (0x20–0x27). Its interrupt logic supports two mutually exclusive modes: interrupt-on-change from previous state or from programmable DEFVAL register comparison - both captured in INTCAP upon assertion.
Each of the eight GPIO pins can be individually configured as input or output via IODIR, with optional internal 100 kΩ pull-ups (GPPU), polarity inversion (IPOL), and interrupt-enable control (GPINTEN). The INT pin is software-configurable as active-high, active-low, or open-drain via IOCON bits ODR and INTPOL - critical for interfacing with diverse host interrupt controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Speed | Up to 1.7 MHz - enables high-throughput I/O polling in real-time control loops without bus contention. |
| Supply Voltage Range | 1.8V to 5.5V - supports direct interfacing with 1.8V, 3.3V, and 5V logic domains without level shifters. |
| Standby Current | 1 µA maximum - minimizes power draw in battery-backed or energy-harvesting applications. |
| GPIO Count & Type | 8 bidirectional CMOS I/O pins (GP0–GP7) - each configurable as input with weak pull-up or push-pull output. |
| Interrupt Logic | Configurable interrupt-on-change with DEFVAL/INTCON register pair - allows precise edge- or level-triggered event detection per pin. |
| Hardware Addressing | Three address pins (A2, A1, A0) - supports up to eight uniquely addressed devices on a single I²C bus segment. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade operation in factory automation and outdoor equipment. |
Pinout & Package
Package: 20-pin SSOP (0.209" body width, 0.025" pitch), RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GP3 | General-purpose bidirectional I/O pin; supports interrupt-on-change and internal pull-up. |
| 2 | VDD | Positive supply rail (1.8V–5.5V); must be decoupled with ≥0.1 µF ceramic capacitor near pin. |
| 3 | GP7 | General-purpose bidirectional I/O pin; supports interrupt-on-change and internal pull-up. |
| 4 | GP6 | General-purpose bidirectional I/O pin; supports interrupt-on-change and internal pull-up. |
| 5 | GP5 | General-purpose bidirectional I/O pin; supports interrupt-on-change and internal pull-up. |
| 6 | GP2 | General-purpose bidirectional I/O pin; supports interrupt-on-change and internal pull-up. |
| 7 | GP1 | General-purpose bidirectional I/O pin; supports interrupt-on-change and internal pull-up. |
| 8 | GP0 | General-purpose bidirectional I/O pin; supports interrupt-on-change and internal pull-up. |
| 9 | N/C | No-connect terminal - must remain unconnected per datasheet; not internally bonded. |
| 10 | GP4 | General-purpose bidirectional I/O pin; supports interrupt-on-change and internal pull-up. |
| 11 | SDA | I²C bidirectional data line; requires external pull-up resistor (typically 2.2–10 kΩ to VDD). |
| 12 | SCL | I²C clock input; driven by master; requires external pull-up resistor (same as SDA). |
| 13 | VSS | Ground reference; must be connected to system common ground with low-impedance path. |
| 14 | A0 | Hardware address input (LSB); externally biased HIGH/LOW to set device I²C address bit 0. |
| 15 | N/C | No-connect terminal - must remain unconnected per datasheet; not internally bonded. |
| 16 | A1 | Hardware address input (middle bit); externally biased HIGH/LOW to set device I²C address bit 1. |
| 17 | RESET | Active-low asynchronous reset input; must be pulled HIGH via ≥10 kΩ resistor; falling edge resets all registers. |
| 18 | A2 | Hardware address input (MSB); externally biased HIGH/LOW to set device I²C address bit 2. |
| 19 | N/C | No-connect terminal - must remain unconnected per datasheet; not internally bonded. |
| 20 | INT | Open-drain or push-pull interrupt output; asserts when enabled GPIO pins change state per INTCON/DEFVAL settings. |
Key Features
| Feature | Design Value |
|---|---|
| Register-based I/O configuration | Eleven 8-bit registers (e.g., IODIR, GPPU, GPINTEN) allow runtime reconfiguration of direction, pull-ups, and interrupt behavior without hardware changes. |
| Interrupt capture register (INTCAP) | Freezes port state at interrupt trigger time - enables deterministic fault logging and eliminates race conditions during host read-back. |
| Configurable interrupt polarity & drive | IOCON bits ODR and INTPOL let INT pin operate as active-high push-pull, active-low push-pull, or open-drain - matching host MCU requirements. |
| Two interrupt-on-change modes | Supports either pin-edge detection (vs. prior state) or level-sensitive detection (vs. DEFVAL register), selected per-pin via INTCON bits. |
| Internal weak pull-up resistors | 100 kΩ pull-ups per GPIO (enabled via GPPU register) reduce BOM count and simplify switch/button interface design. |
Applications
| Industrial HMI Keypad Interface | Smart Sensor Node Expansion |
|---|---|
|
Use Scenario: Adding 8 tactile buttons and 4 status LEDs to a PLC-mounted HMI panel using only two I²C lines from the main controller. IC Role / Device Role / Timing Role: MCP23008T-E/SSVAO acts as a remote I/O bridge, scanning button states via interrupt-on-change and driving LEDs via GPIO outputs. Use Value: Eliminates need for additional MCU GPIOs; reduces wiring complexity; enables fast response (<100 µs INT latency) to user input. |
Use Scenario: Extending I/O on a battery-powered environmental sensor node to support analog multiplexing control and digital alarm outputs. IC Role / Device Role / Timing Role: MCP23008T-E/SSVAO provides configurable GPIOs for ADC channel selection and latched alarm signaling under ultra-low-power sleep mode. Use Value: Achieves 1 µA standby current during deep-sleep cycles; supports wake-on-button-press via INT-driven interrupt. |
| IoT Gateway Peripheral Control | Automated Test Equipment (ATE) Fixture |
|
Use Scenario: Managing 8 relay drivers and 8 opto-isolated inputs in a Wi-Fi-enabled home automation gateway board. IC Role / Device Role / Timing Role: MCP23008T-E/SSVAO serves as isolated I/O expander, interfacing with relay coils and field sensors via level-shifted GPIOs. Use Value: Enables centralized I²C control of distributed peripherals; simplifies firmware by abstracting I/O state into register reads/writes. |
Use Scenario: Controlling DUT power sequencing, test signal routing, and pass/fail indicator LEDs in a benchtop ATE fixture. IC Role / Device Role / Timing Role: MCP23008T-E/SSVAO functions as a deterministic I/O sequencer, synchronizing power rails and measurement triggers via register writes. Use Value: Guarantees repeatable timing (no software jitter) via hardware-register access; supports hot-plug detection via interrupt-on-change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I/O expander applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9554APW,118 | 8-bit I²C expander with identical 20-pin TSSOP package and 1.65–5.5V range; lacks DEFVAL/INTCON register pair for advanced interrupt modes. | Supports basic interrupt-on-change only (vs. dual-mode in MCP23008T-E/SSVAO); no polarity inversion register (IPOL). | Select when interrupt requirements are simple edge-detection only and PCB layout reuse is prioritized. |
| TCA6408APWR | 8-bit I²C expander with 1.65–5.5V operation and 20-pin TSSOP; includes reset pin but no hardware address pins - fixed I²C address (0x20). | Only one device per I²C bus unless external mux used; no A2/A1/A0 addressing flexibility for multi-device networks. | Choose for single-expander designs where address conflict avoidance is unnecessary and reset integration is valued. |
Compared with PCA9554APW,118 and TCA6408APWR, the MCP23008T-E/SSVAO offers superior interrupt flexibility (dual-mode detection, DEFVAL capture), full hardware addressability (A2–A0), and polarity inversion - making it optimal for complex, multi-node industrial I/O systems requiring deterministic event handling.
Availability
MCP23008T-E/SSVAO is available at Aetrix Electronics and suitable for industrial HMI, smart sensor nodes, IoT gateways, and automated test equipment requiring stable component supply and long-term manufacturability.
Supply support for MCP23008T-E/SSVAO 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, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP23X08 product line was developed specifically for cost-effective, low-power I/O expansion in resource-constrained embedded systems - emphasizing register-level configurability, interrupt intelligence, and broad voltage compatibility.
FAQ
What is the maximum I²C clock frequency supported by the MCP23008T-E/SSVAO?
The MCP23008T-E/SSVAO supports I²C operation up to 1.7 MHz under 4.5V–5.5V supply and –40°C to +125°C conditions. At 1.8V–5.5V and –40°C to +85°C, it supports 100 kHz, 400 kHz, and 1.7 MHz modes - verified in DS20001919F Section 1.3.2. This enables high-speed polling in time-critical applications without sacrificing noise immunity.
Does the MCP23008T-E/SSVAO require external pull-up resistors on SDA and SCL lines?
Yes, the MCP23008T-E/SSVAO requires external pull-up resistors on both SDA and SCL lines to ensure proper I²C bus operation. Typical values range from 2.2 kΩ to 10 kΩ to VDD, selected based on bus capacitance and desired rise time. The device itself does not integrate internal pull-ups on these lines.
How does the interrupt capture register (INTCAP) function in the MCP23008T-E/SSVAO?
The INTCAP register in the MCP23008T-E/SSVAO captures the exact GPIO port state at the moment an interrupt is triggered. It is read-only and updated only on interrupt assertion. Reading INTCAP (or GPIO) clears the interrupt condition - ensuring the host can reliably log the cause before subsequent events overwrite the capture.
Can the MCP23008T-E/SSVAO operate from a 1.8V supply?
Yes, the MCP23008T-E/SSVAO is fully specified for 1.8V to 5.5V operation across –40°C to +85°C. At 1.8V, it supports I²C speeds up to 100 kHz (DS20001919F page 1), making it compatible with ultra-low-voltage microcontrollers and energy-efficient sensor nodes.
What is the purpose of the A2, A1, and A0 pins on the MCP23008T-E/SSVAO?
The A2, A1, and A0 pins on the MCP23008T-E/SSVAO are hardware address inputs that determine the device's 7-bit I²C slave address (bits 4–2). With three binary-selectable pins, up to eight MCP23008T-E/SSVAO devices can share one I²C bus without address conflict - essential for modular I/O expansion systems.
MCP23008T-E/SSVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of I/O:
- 8
- Interface:
- I2C
- Interrupt Output:
- Yes
- Features:
- POR
- Output Type:
- Push-Pull
- Current - Output Source/Sink:
- 25mA
- Clock Frequency:
- 10 MHz
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
MCP23008T-E/SSVAO FAQ
1.How can I place an order for MCP23008T-E/SSVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP23008T-E/SSVAO 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 MCP23008T-E/SSVAO reliable?
The price and inventory of MCP23008T-E/SSVAO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP23008T-E/SSVAO is usually 5 days.
3.What payment methods are accepted for MCP23008T-E/SSVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP23008T-E/SSVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP23008T-E/SSVAO?
MCP23008T-E/SSVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP23008T-E/SSVAO 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 MCP23008T-E/SSVAO?
For technical support, including MCP23008T-E/SSVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP23008T-E/SSVAO requirements.
6.How does Aetrix verify that MCP23008T-E/SSVAO is sourced from the original manufacturer or authorized distributors?
All MCP23008T-E/SSVAO 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 MCP23008T-E/SSVAO meets industry standards.
7.What is the process for return or replacement of MCP23008T-E/SSVAO?
All MCP23008T-E/SSVAO units undergo pre-shipment inspection (PSI). If there is an issue with MCP23008T-E/SSVAO, 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 MCP23008T-E/SSVAO part is unused and in its original packaging.
Return procedure for MCP23008T-E/SSVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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