PCF8574ADGVRE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments PCF8574ADGVRE4 is a remote 8-bit I/O expander communicating over the I2C bus at up to 100 kHz in a TSSOP-20 surface mount package. Provides 8 bidirectional I/O lines through a single 2-wire interface, reducing microcontroller pin count. Available from authorized distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- PCF8574ADGVRE4 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 PCF8574ADGVRE4?
- 8 bidirectional I/O lines controlled via I2C bus at up to 100 kHz, reducing microcontroller GPIO requirements with just 2 wires
- 20-pin TSSOP-20 (PDSO-G20) package with 0.65 mm pitch for compact board integration in space-constrained designs
- Interrupt output line allows the host MCU to detect I/O pin state changes without polling, reducing CPU overhead
What is PCF8574ADGVRE4 used for?
PCF8574ADGVRE4 is used in microcontroller-based designs where GPIO expansion is needed via a simple 2-wire I2C interface, such as LCD display control, keypad scanning, and LED driving in consumer electronics and industrial HMI panels. Its 8-bit I/O port with interrupt capability makes it ideal for remote sensor readout and status monitoring in distributed control systems. The TSSOP-20 surface mount package integrates easily into compact PCBs in IoT nodes, home automation controllers, and embedded computing modules.
What are the specifications of PCF8574ADGVRE4?
| YTEOL | 0 |
| Clock Frequency-Max | 0.1MHz |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Number of Bits | 8 |
| Number of I/O Lines | 8 |
| Number of Ports | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP20,.25,16 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max | 0.1mA |
| Supply Voltage-Max | 6V |
| Supply Voltage-Min | 2.5V |
| Supply Voltage-Nom | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.4mm |
| 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 PCF8574ADGVRE4 datasheet?
PCF8574ADGVRE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for PCF8574ADGVRE4?
Compatible alternatives and drop-in replacements for PCF8574ADGVRE4:
Frequently Asked Questions
How many I/O lines does the PCF8574ADGVRE4 provide, and what interface does it use?
The PCF8574ADGVRE4 provides 8 bidirectional I/O lines over a 2-wire I2C bus interface operating at up to 100 kHz. A single I2C address allows the host microcontroller to read or write all 8 pins with a single byte transfer, and multiple devices can share the same bus using different address pin configurations, expanding I/O to up to 64 additional pins with 8 devices on one I2C bus.
What package does the PCF8574ADGVRE4 come in, and how does it differ from the DIP version?
The PCF8574ADGVRE4 is packaged in a TSSOP-20 (PDSO-G20) surface mount package with 20 pins on a 0.65 mm lead pitch, versus the wider DIP packages used in older PCF8574 variants. The TSSOP-20 SMT package enables a significantly smaller PCB footprint, is compatible with automated reflow soldering, and reduces board height compared to through-hole DIP alternatives, making it preferred in modern compact embedded system layouts.
How does the PCF8574ADGVRE4 differ from the PCF8574 standard variant in addressing?
The 'A' suffix in PCF8574ADGVRE4 indicates the A-variant, which uses a different I2C address range than the standard PCF8574. The A-variant occupies addresses 0x38 to 0x3F (with A0-A2 pins), while the standard variant uses 0x20 to 0x27. This allows up to 8 PCF8574A devices and 8 PCF8574 devices — a total of 16 expanders providing 128 additional I/O pins — to coexist on the same 100 kHz I2C bus without address conflicts.
Which embedded systems benefit most from adding the PCF8574ADGVRE4 for I/O expansion?
Microcontrollers with limited GPIO pins benefit most from the PCF8574ADGVRE4's 8 extra I/O channels via 2 I2C wires. Typical use cases include Arduino and STM32 projects driving 4-bit or 8-bit parallel LCDs without dedicating 8 GPIO lines, Raspberry Pi HAT boards needing relay control or sensor interfacing, and industrial PLCs that must read 8-channel digital inputs or drive 8-channel LED status indicators while keeping the main MCU pins free for communication peripherals.
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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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