Skip to main content
Log in
Texas Instruments PCF8574PWR — Interface & Transceivers

Texas Instruments PCF8574PWR I²C I/O Expander, 8-Bit

MPNPCF8574PWR
Active

Texas Instruments PCF8574PWR, 8-bit I²C I/O expander, 100 kHz clock, push-pull outputs, 1 mA source / 25 mA sink, 2.5 V to 6 V supply, -40°C to 85°C, 20-TSSOP package.

$1.9500Ref. price · indicative, final on quote
Texas Instruments PCF8574PWR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

PCF8574PWR specifications
ParameterValue
Output typePush-Pull
MountingSurface Mount
Supply voltage2.5V ~ 6V
Current - output source (Sink)1mA, 25mA
Clock frequency100 kHz
InterfaceI²C
Operating temperature-40°C~85°C
PackageTape & Reel (TR); Cut Tape (CT)
FeaturesPOR
Number of i (O)8
Case20-TSSOP (0.173\", 4.40mm Width)
Interrupt outputYes

Product details

8-bit I²C GPIO expander in a 20-TSSOP

It includes a power-on reset (POR) feature that initializes the outputs to a known state at power-up, and an interrupt output pin signals the host when input levels change. The 20-TSSOP package (4.40 mm width) is a surface-mount footprint common in space-constrained PCBs for industrial control panels, telecom line cards, and sensor hubs.

If you need to sink more than 25 mA per pin, budget an external driver or buffer. The 100 kHz I²C clock is the standard-mode speed; for faster bus throughput, consider a 400 kHz-capable expander like the PCF8575.

Frequently asked questions

What is the difference between PCF8574 and PCF8574PWR?

The base part number PCF8574 refers to the 8-bit I²C I/O expander family. The PCF8574PWR suffix indicates the 20-TSSOP package and Tape & Reel (TR) / Cut Tape (CT) shipping format. The die and electrical specifications are identical across the package variants; the only difference is the physical footprint and reel packaging.

Can PCF8574PWR work with 5V?

Yes. The supply voltage range is 2.5 V to 6 V, so a 5 V rail is well within the operating limits. The I²C bus logic levels follow VDD, so a 5 V supply means the SDA/SCL lines swing to 5 V — ensure the host I²C controller is 5 V-tolerant or use a level shifter.