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Texas Instruments PCF8574ADGVR — Interface & Transceivers

Texas Instruments PCF8574ADGVR I2C I/O Expander, 8-bit

MPNPCF8574ADGVR
Active

Texas Instruments PCF8574ADGVR, 8-bit I2C I/O expander, 100 kHz clock, 2.5V to 6V supply, push-pull outputs, interrupt output, -40°C to 85°C, 20-TVSOP package.

$1.9500Ref. price · indicative, final on quote
Texas Instruments PCF8574ADGVR datasheet (PDF)
Packaging20-TFSOP (0.173", 4.40mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

PCF8574ADGVR 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-TFSOP (0.173\", 4.40mm Width)
Interrupt outputYes

Product details

8-bit I2C I/O expander in a 20-TVSOP package

It provides eight push-pull I/O lines, each capable of sinking 25 mA or sourcing 1 mA, making it a practical choice for driving LEDs, reading switches, or expanding the GPIO count of a microcontroller without adding extra pins. The part includes a power-on reset (POR) feature that initializes the I/O to a known state at power-up, and an interrupt output (INT) that signals the host when an input changes, eliminating the need for constant polling. Housed in a 20-pin TVSOP package (4.4 mm wide, 0.173" pitch), it is a surface-mount device suited for compact PCB layouts.

Supply voltage range and temperature grade

For designs that need the I/O expander to run from a 1.8 V rail or survive under-hood automotive temperatures (125°C), this part is not the fit — the TCA9536ADTMR (1.65 V minimum, -40°C to 125°C) is a functional alternative, though it offers only 4 I/O and open-drain outputs.

It is ROHS3 compliant. There is no LTB risk or imminent obsolescence to plan around for new designs.

Frequently asked questions

Where can I buy PCF8574ADGVR available via RFQ confirmation?

The PCF8574ADGVR is available to order through independent distribution.

Does PCF8574ADGVR have an interrupt output?

Yes, the PCF8574ADGVR includes an interrupt output (INT) that asserts when an input changes state, allowing the host microcontroller to respond without polling the I²C bus.

What is the difference between PCF8574ADGVR and PCF8574DGVR?

The distinction between the PCF8574A and PCF8574 variants lies in the I²C slave address. The PCF8574A (base part number PCF8574A) uses a different fixed address block (0x38–0x3F) than the standard PCF8574 (0x20–0x27), allowing both to coexist on the same I²C bus without address conflict. The 'DGVR' suffix indicates a different package or tape/reel option — verify the specific package code against your BOM.

What is the difference between PCF8574 and PCF8574A?

The PCF8574 and PCF8574A are functionally identical (8-bit I/O expander, same pinout, same electrical specs) but differ in their I²C slave address range. The PCF8574 occupies addresses 0x20–0x27, while the PCF8574A occupies 0x38–0x3F. This allows up to 16 of these devices on a single I²C bus (8 of each variant).