PCF8574ADW Texas Instruments In Stock
The PCF8574ADW is a electronic component from Texas Instruments, available for purchase on FindMyChip with competitive pricing and worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- —
- Lifecycle
- —
- Datasheet
- N/A
- Price
- From $0.9750(MOQ 1)
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the specifications of PCF8574ADW?
| Supply Voltage | 2.5–6V |
| I2C Bus Speed | 400kHz |
| I/O Ports | 8 |
| Interrupt Output | Active-low /INT |
| Standby Current | 10μA |
| Operating Temperature | -40 to +85°C |
| Package | SOIC-20W |
| Interface | I2C |
What are equivalent replacements for PCF8574ADW?
Compatible alternatives and drop-in replacements for PCF8574ADW:
Tape-and-reel packaging variant of PCF8574ADW; identical electrical specs, same footprint, drop-in replacement for high-volume SMT assembly
NXP equivalent 8-bit I2C I/O expander with matching I2C address range (0x38–0x3F), same pin count and function, compatible firmware driver
Frequently Asked Questions
How many PCF8574ADW devices can share a single I2C bus?
Up to 8 PCF8574ADW devices can coexist on one I2C bus. Each device has three hardware address pins (A0, A1, A2) that set its 7-bit address, giving 8 unique addresses (0x38–0x3F). For designs needing more than 64 I/O lines, the PCF8574A (0x70–0x77 range) can be combined on the same bus for a total of 16 expanders and 128 I/O pins.
Supply voltage compatibility: does PCF8574ADW work at 3.3V and 5V?
Yes. PCF8574ADW operates from 2.5V to 6V, making it fully compatible with both 3.3V (ARM Cortex-M, ESP32) and 5V (ATmega, classic Arduino) systems. The I2C lines must not exceed VCC; if your MCU runs at 3.3V but the expander is powered at 5V, use a level shifter on SDA/SCL to avoid latch-up.
How does the /INT interrupt pin work on PCF8574ADW?
The /INT pin goes low whenever any of the 8 I/O lines changes state (input toggles). The host MCU detects this falling edge via a GPIO interrupt, then reads the I2C port register to identify which pin changed. This eliminates polling, reducing bus traffic and CPU load — especially useful in battery-powered IoT nodes where the MCU can sleep between events.
Minimum order and lead time for PCF8574ADW
PCF8574ADW is available with MOQ 1 unit. Standard pricing starts at $2.00 for 1 piece, dropping to $0.975 for 15+ pieces. Lead time is typically within 2 weeks for stocked quantities; for large orders (1000+) contact us for a dedicated quote and expedited sourcing.
Compatible alternatives to PCF8574ADW for design-in
Pin-compatible alternatives include the PCF8574ADWR (tape-and-reel variant), NXP PCF8574A (identical functionality, same I2C address range 0x38–0x3F), and the MCP23008 (Microchip, 18-pin DIP/SOIC, 1.8–5.5V, additional features). For higher channel counts, consider the PCF8575 (16-bit expander, I2C) or MCP23017 (16-bit, I2C, interrupt per bank).
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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.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $2.0000 | $2.00 |
| 4+ | $1.5000 | $6.00 |
| 14+ | $1.0000 | $14.00 |
| 15+ | $0.9750 | $14.63 |
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