PCF8574APWRIn StockTexas Instruments
PCF8574APWR is an 8-bit I2C I/O expander by Texas Instruments in TSSOP-16, operating 2.5–6V with interrupt output. From $0.36/unit, in stock, ships worldwide, 1-piece minimum.
- Manufacturer
- Texas Instruments
- Package
- TSSOP-16
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- PCF8574APWR Datasheet PDF
- Category
- interface-io-expanders
- Price
- From $0.3640(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-bit quasi-bidirectional I/O port via I2C bus (up to 400kHz)
- Wide supply voltage range: 2.5V to 6V
- Active-low interrupt output for host notification on port change
- Up to 8 devices on same bus (A-variant address 0x38–0x3F)
- Low standby current: 10µA typical
- TSSOP-16 package for compact PCB layouts
Applications
PCF8574APWR is widely used to expand GPIO on microcontrollers in industrial control panels, home automation systems, and embedded displays. It suits any application where MCU pins are limited but multiple digital I/O signals — such as LEDs, buttons, relay drivers, or status indicators — must be managed over a shared I2C bus.
Specifications
| Supply Voltage | 2.5 to 6V |
| Interface | I2C |
| I/O Channels | 8 |
| Operating Temperature | -40 to +85°C |
| I2C Speed | 400kHz |
| Package | TSSOP-16 |
| Supply Current (standby) | 10µA |
| Logic High Output Current (IOH) | 0.3mA |
| Package | TSSOP-16 |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL MSL1 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for PCF8574APWR:
Same die, same TSSOP-16 package and electrical specs; only I2C address range differs (0x20–0x27 vs 0x38–0x3F). Drop-in compatible after address reassignment.
8-bit low-voltage I2C/SMBus I/O expander, 1.65–5.5V, TSSOP-16. Pin and register compatible with PCF8574APWR, extended lower voltage support, same TI family.
Frequently Asked Questions
How many PCF8574APWR devices can share the same I2C bus?
Up to 8 PCF8574APWR devices can coexist on a single I2C bus simultaneously. The A-variant uses address pins A0–A2 to select one of 8 unique 7-bit addresses (0x38–0x3F), enabling you to control 64 independent I/O lines from a single MCU I2C port without any address conflicts.
What is the interrupt pin used for on the PCF8574APWR?
The active-low INT pin outputs a logic-low signal whenever any of the 8 I/O port bits changes state. This allows the host microcontroller to enter a low-power sleep mode and only wake up on a state change, avoiding continuous polling over the I2C bus and reducing overall system power consumption.
Is PCF8574APWR compatible with 3.3V MCUs like STM32 or ESP32?
Yes. PCF8574APWR operates down to 2.5V supply, making its I/O logic fully compatible with 3.3V systems such as STM32, ESP32, and Raspberry Pi. SDA/SCL thresholds scale with VCC, so no level-shifter is required when both the MCU and PCF8574APWR share the same 3.3V rail.
What is the difference between PCF8574APWR and PCF8574PWR?
Both are 8-bit I2C I/O expanders in TSSOP-16 with identical electrical specs. The only difference is the I2C address range: PCF8574PWR (standard variant) uses 0x20–0x27, while PCF8574APWR (A-variant) uses 0x38–0x3F. Mixing both variants lets you place up to 16 expanders on one bus, yielding 128 extra I/O lines.
PCF8574APWR packaging options and minimum order quantity?
PCF8574APWR comes in tape-and-reel TSSOP-16 packaging (PWR suffix). FindMyChip stocks it with a minimum order quantity of 1 piece, priced from $1.40 at single-unit quantity down to $0.36 at 477+ units. Lead time is typically within 2 weeks for standard orders.
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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.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.4000 | $1.40 |
| 10+ | $1.1300 | $11.30 |
| 25+ | $1.0300 | $25.75 |
| 87+ | $0.4200 | $36.54 |
| 477+ | $0.3640 | $173.63 |
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