PCF8575DWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The PCF8575DWG4 is a 16-bit I2C and SMBus I/O expander IC from Texas Instruments with 2 ports of 8 I/O lines each, supporting up to 400 kHz fast-mode I2C clock in a 24-pin wide SOIC package. It is RoHS-compliant and widely used for GPIO expansion in embedded and industrial designs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 24
- Lifecycle
- OBSOLETE
- Datasheet
- PCF8575DWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of PCF8575DWG4?
- 16-bit bidirectional I/O expansion across 2 independent 8-bit ports via I2C and SMBus 2-wire interface
- Supports up to 400 kHz fast-mode I2C clock frequency for rapid GPIO state updates in real-time systems
- 24-pin wide SOIC package (R-PDSO-G24) with plastic/epoxy body for standard SMT PCB assembly
- RoHS-compliant (JESD-609 e4) lead-free construction suitable for global electronics market compliance
What is PCF8575DWG4 used for?
The PCF8575DWG4 is commonly used to expand the GPIO count of microcontrollers and SoCs in embedded systems, industrial controllers, and IoT gateway boards where only 2 I2C wires are available for communication. Its 16 I/O lines across 2 ports make it ideal for driving LED matrices, reading button arrays, controlling relay banks, and interfacing with parallel sensors in space-constrained designs that require minimal additional wiring.
What are the specifications of PCF8575DWG4?
| YTEOL | 0 |
| Clock Frequency-Max | 0.4MHz |
| JESD-30 Code | R-PDSO-G24 |
| JESD-609 Code | e4 |
| Number of Bits | 16 |
| Number of I/O Lines | 16 |
| Number of Ports | 2 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP24,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max | 0.2mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 2.5V |
| Supply Voltage-Nom | 3.3V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| uPs/uCs/Peripheral ICs Type | PARALLEL IO PORT, GENERAL PURPOSE |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the PCF8575DWG4 datasheet?
PCF8575DWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for PCF8575DWG4?
Compatible alternatives and drop-in replacements for PCF8575DWG4:
Frequently Asked Questions
How many I/O lines does the PCF8575DWG4 provide and how are they organized?
The PCF8575DWG4 provides 16 bidirectional I/O lines organized as 2 independent 8-bit ports (P0 and P1), giving a total of 16 pins accessible through a single I2C or SMBus 2-wire interface. All 16 I/O lines can be configured as inputs or outputs under software control, making the device flexible for mixed input/output signal management in microcontroller-based designs.
What maximum I2C clock speed does the PCF8575DWG4 support and how does that limit GPIO update rates?
The PCF8575DWG4 supports a maximum I2C clock frequency of 400 kHz (fast mode). At 400 kHz, a full 16-bit I/O read or write transaction takes approximately 40 to 50 microseconds including addressing and ACK bits, allowing GPIO update rates of up to roughly 20,000 transactions per second. This is sufficient for LED display refreshing, button scanning, and relay control tasks in most embedded applications.
Which package does the PCF8575DWG4 use and how does the wide SOIC body affect PCB layout?
The PCF8575DWG4 uses a 24-pin wide SOIC package (JESD-30 code R-PDSO-G24, equivalence code SOP24,.4) with a 0.4-inch body width. The wide SOIC body provides comfortable pad pitch for manual soldering and inspection while still fitting in SMT reflow processes. PCB designers should allocate approximately 15.4 mm x 7.5 mm of board area for the 24-pin footprint when placing the device.
Can multiple PCF8575DWG4 devices be connected on the same I2C bus and how many total I/O lines can be achieved?
Multiple PCF8575DWG4 devices can share the same 2-wire I2C bus by assigning unique 7-bit I2C addresses through the A0, A1, and A2 hardware address pins, supporting up to 8 devices per bus. With 8 devices, a system can expand to 128 I/O lines (8 devices x 16 I/O lines each) while using only 2 microcontroller pins for SDA and SCL, which is highly efficient for large LED panel or relay matrix control systems.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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