PCA9539PW
I²C and SMBus low-power I/O expanderThe PCA9539PW is a i²c and smbus low-power i/o expander from Nexperia. View the full PCA9539PW datasheet below including key specifications.
PCA9539PW shares its datasheet with PCA9539, whose page lists every part number it covers.
Official PCA9539PW datasheet (PDF) — the source this page was extracted from.
PCA9539PW Key Specifications
| Parameter | Value |
|---|---|
| I²C Bus Speed | 400 kHz |
| Number Of I/O Pins | 16 |
| Supply Voltage Range | 2.3 V to 5.5 V |
| I/O Voltage Tolerance | 5 V |
| Communication Interface | I²C, SMBus |
| Output Drive Current (IOH) | 10 mA (maximum) |
| Output Drive Current (IOL) | 25 mA (maximum) |
| Operating Temperature Range | -40 °C to +85 °C |
| Standby Current Consumption | 1 µA (maximum) |
| Package Body Width (TSSOP24) | 4.4 mm |
PCA9539PW Overview
Part: PCA9539 — Nexperia
Type: I²C and SMBus Low-Power I/O Expander
Description: A 16-bit I²C and SMBus low-power I/O expander with interrupt output and reset pin, operating from 2.3 V to 5.5 V, featuring 5 V tolerant I/Os and 400 kHz Fast-mode I²C-bus.
Operating Conditions:
- Supply voltage: 2.3 V to 5.5 V
- Operating temperature: -40 °C to +85 °C
- I²C-bus speed: 400 kHz (Fast-mode)
Absolute Maximum Ratings:
- Max I/O voltage: 5.5 V (5 V tolerant I/Os)
- Max output drive capability: 25 mA (for directly driving LEDs)
- Latch-up performance: exceeds 100 mA per JESD78, Class II
Key Specs:
- Number of I/O pins: 16
- Standby current consumption: 1 μA (maximum)
- SCL and SDA input hysteresis (Vhys): 0.10 × VCC (typical)
- ESD protection HBM: exceeds 2000 V (ANSI/ESDA/JEDEC JS-001 class 2)
- ESD protection CDM: exceeds 1000 V (ANSI/ESDA/JEDEC JS-002 class C3)
- I/O default state at power-up: Inputs
- I²C slave addresses: 4 possible addresses (configurable via A0, A1 pins)
Features:
- I²C-bus to parallel port expander
- Ultra low standby current consumption
- Schmitt-trigger action on SCL and SDA inputs for noise immunity
- Noise filter on SCL and SDA inputs
- Open-drain active LOW interrupt output (INT)
- Reset input (RESET) for resetting to default values
- Internal power-on reset
- No glitch on power-up
- Latched outputs with 25 mA drive maximum capability
- Configuration registers for Input, Output, Polarity Inversion
Applications:
- ACPI power switches
- Sensors
- Push buttons
- LEDs
- Fan control
Package:
- TSSOP24 (plastic thin shrink small outline package; 24 leads; body width 4.4 mm)
PCA9539PW Features
- I²C-bus to parallel port expander
- Operating power supply voltage range of 2.3 V to 5.5 V
- Ultra low standby current consumption:
- 1 μA (maximum)
- Schmitt-trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs
- Vhys = 0.10 × VCC (typical)
- Noise filter on SCL and SDA inputs
- 5 V tolerant I/Os
- 16 I/O pins which power up configured in input state
- Open-drain active LOW interrupt output (INT)
- Reset input (RESET) for resetting PCA9539 to default values
- 400 kHz Fast-mode I²C-bus
- Internal power-on reset
- No glitch on power-up
- Latched outputs with 25 mA drive maximum capability for directly driving LEDs
- Latch-up performance exceeds 100 mA per JESD78, Class II
- ESD protection:
- HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V
- CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V
- TSSOP24 package: plastic thin shrink small outline package; 24 leads; body width 4.4 mm
- Specified from -40 °C to +85 °C
Low-voltage 16-bit I²C and SMBus low-power I/O expander with interrupt output, reset pin and configuration registers
PCA9539PW Pin Configuration
Table 2. Pin description
| Symbol | Pin | Type | Description |
|---|---|---|---|
| INT | 1 | O | Interrupt output. Connect to V CC through a pull-up resistor |
| A1 | 2 | I | Address input 1. Connect directly to V CC or GND |
| RESET | 3 | I | Active Low reset input. Connect to V CC through a pull-up resistor if no active connection is used. |
| P0_0 [1] | 4 | I/O | Parallel port I/O. Push-pull driver. At power on, P0_0 is configured as input |
| P0_1 [1] | 5 | I/O | Parallel port I/O. Push-pull driver. At power on, P0_1 is configured as input |
| P0_2 [1] | 6 | I/O | Parallel port I/O. Push-pull driver. At power on, P0_2 is configured as input |
| P0_3 [1] | 7 | I/O | Parallel port I/O. Push-pull driver. At power on, P0_3 is configured as input |
| P0_4 [1] | 8 | I/O | Parallel port I/O. Push-pull driver. At power on, P0_4 is configured as input |
| P0_5 [1] | 9 | I/O | Parallel port I/O. Push-pull driver. At power on, P0_5 is configured as input |
| P0_6 [1] | 10 | I/O | Parallel port I/O. Push-pull driver. At power on, P0_6 is configured as input |
| P0_7 [1] | 11 | I/O | Parallel port I/O. Push-pull driver. At power on, P0_7 is configured as input |
| GND | 12 | power | Ground |
| P1_0 [2] | 13 | I/O | Parallel port I/O. Push-pull driver. At power on, P1_0 is configured as input |
| P1_1 [2] | 14 | I/O | Parallel port I/O. Push-pull driver. At power on, P1_1 is configured as input |
| P1_2 [2] | 15 | I/O | Parallel port I/O. Push-pull driver. At power on, P1_2 is configured as input |
| P1_3 [2] | 16 | I/O | Parallel port I/O. Push-pull driver. At power on, P1_3 is configured as input |
| P1_4 [2] | 17 | I/O | Parallel port I/O. Push-pull driver. At power on, P1_4 is configured as input |
| P1_5 [2] | 18 | I/O | Parallel port I/O. Push-pull driver. At power on, P1_5 is configured as input |
| P1_6 [2] | 19 | I/O | Parallel port I/O. Push-pull driver. At power on, P1_6 is configured as input |
| P1_7 [2] | 20 | I/O | Parallel port I/O. Push-pull driver. At power on, P1_7 is configured as input |
Table 2. Pin description
PCA9539PW Thermal Information
| Symbol | Parameter | Conditions | Max | Unit | |
|---|---|---|---|---|---|
| Z th(j-a) | transient thermal impedance from junction to ambient | TSSOP24 package | [1] | 100 | K/W |
Low-voltage 16-bit I²C and SMBus low-power I/O expander with interrupt output, reset pin and configuration registers
PCA9539PW Package Information
| UNIT | A max. | A 1 | A 2 | A 3 | b p | c | D (1) | E (2) | e | H E | L | L p | Q | v | w | y | (1) Z | θ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 1.1 | 0.15 0.05 | 0.95 0.80 | 0.25 | 0.30 0.19 | 0.2 0.1 | 7.9 7.7 | 4.5 4.3 | 0.65 | 6.6 6.2 | 1 | 0.75 0.50 | 0.4 0.3 | 0.2 | 0.13 | 0.1 | 0.5 0.2 | 8 0 o o |
| OUTLINE VERSION | REFERENCES | REFERENCES | REFERENCES | EUROPEAN | ISSUE DATE |
|---|---|---|---|---|---|
| IEC | JEDEC | JEITA | PROJECTION | ||
| SOT355-1 | MO-153 | 99-12-27 03-02-19 |
Fig. 27. Package outline SOT355-1 (TSSOP24)
Low-voltage 16-bit I²C and SMBus low-power I/O expander with interrupt output, reset pin and configuration registers
Variants on the same datasheet
These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.
| Part Number | Manufacturer | Package |
|---|---|---|
| PCA9539 | Nexperia | TSSOP24 |
More datasheets
Ask your AI agent about the PCA9539PW
Connect SheetsData to Claude, Cursor, Codex or any MCP client and your agent reads this datasheet for you: pinout, limits, register maps and design checks, with the numbers taken from the PDF.
claude mcp add --transport http sheetsdata https://mcp.sheetsdata.com/mcp
Then ask: "Can the PCA9539PW run from my 12 V rail? Check it against the datasheet limits."
Create a free account $2 of usage every month, no card needed.