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Texas Instruments PCF8574DGVRG4 — Interface & Transceivers

Texas Instruments PCF8574DGVRG4 I²C I/O Expander, 8-bit

MPNPCF8574DGVRG4
End of Life

Texas Instruments PCF8574DGVRG4, 8-bit I²C-bus I/O expander, 100 kHz clock, 2.5V-6V supply, push-pull outputs, 1 mA source / 25 mA sink, interrupt output, -40°C to 85°C, 20-TVSOP, Tape & Reel.

$0.4200Ref. price · indicative, final on quote
Texas Instruments PCF8574DGVRG4 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

PCF8574DGVRG4 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)
FeaturesPOR
Number of i (O)8
Case20-TFSOP (0.173\", 4.40mm Width)
Interrupt outputYes

Product details

What the PCF8574DGVRG4 does on the board

The part includes a power-on reset (POR) feature that initializes the I/O ports to a known state at power-up, and an open-drain interrupt output that signals the host when an input changes state, saving the MCU from polling.

The output current spec is asymmetric: 1 mA source (HIGH) and 25 mA sink (LOW). In practice, the sink capability is what drives LEDs, relay coils through a transistor, or logic inputs on another IC; the source side is weaker, so if you need to drive a load HIGH at more than a milliamp, plan on an external pull-up or a buffer.

Package, footprint, and production status

The DGVRG4 suffix indicates the 20-TVSOP package (4.40 mm width, 0.173" pitch) on Tape & Reel — a fine-pitch surface-mount footprint that suits automated pick-and-place.

Frequently asked questions

What is the I2C address of PCF8574DGVRG4?

The PCF8574DGVRG4 uses the standard PCF8574 I²C address scheme: the seven-bit base address is 0x20 (0100000 binary), with the three least-significant bits set by the A0, A1, and A2 address pins. By tying these pins HIGH or LOW you can select any address from 0x20 to 0x27, allowing up to eight of these expanders on the same I²C bus.

Does PCF8574DGVRG4 have an interrupt output?

Yes, the PCF8574DGVRG4 provides an open-drain interrupt output pin (INT). It asserts LOW when any input pin changes state, and remains asserted until the host reads the input port via an I²C read. This allows the host to respond to external events without polling the I²C bus.