PCA9539PWR - 16-Bit I/O Expander | NXP Semiconductors (Tape & Reel)
N.º da peça: PCA9539PWR ✓ AtivoPCA9539PWR Visão geral
An I/O expander is an interface IC that converts serial bus commands from a microcontroller or other host into multiple parallel digital signals. In the hierarchy, the PCA9539PWR belongs to the I/O-expander class, then interface ICs, then semiconductor devices. Its purpose is to reduce direct GPIO requirements in systems that need many buttons, indicators, sensors, relays, or control lines while retaining a compact serial connection.
The main feature set includes 16 general-purpose I/O lines, an interrupt output, reset support, configurable registers, and I2C/SMBus operation. The verified product description identifies the device as a 24-pin CMOS device with 16 GPIO expansion functions. Its 2.3 V to 5.5 V operating range supports both low-voltage and 5 V powered embedded systems, while the 400 kHz interface specification supports common embedded bus speeds.
The interrupt and reset functions help the host avoid continuous polling when input lines change. Reset allows the host to initialize the device and its registers reliably, while the interrupt output provides an event indication for input changes. Because the exact pin names, electrical limits, and register details are not included in the supplied verified data, those values are not guessed in this record.
Typical applications include ACPI power switches, sensor interfaces, push-button panels, LED indicators, and remote GPIO expansion for microcontrollers. The 16-bit organization makes it useful when a system needs more lines than a typical microcontroller package provides but does not require a large matrix keyboard or very high-current outputs.
For PCB design, confirm the 24-pin TSSOP footprint and verify the bus voltage, pull-up requirements, address configuration, and pin mapping against the manufacturer datasheet before release. Do not assume that an electrically similar expander is a true drop-in replacement without checking every pin and electrical parameter.
This page combines verified manufacturer and distributor descriptions, explicit data gaps, package information, application guidance, and drop-in replacement screening for the PCA9539PWR.
Alternativas drop-in para PCA9539PWR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com PCA9539PWR (mesmo formato e footprint) — diferindo em Package, Interface.
TCA9539PWR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PCA9539PW-T
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
PCA9539PW/Q900
✅ Drop-In ⚠️ Especificações não verificadasConsulte o preço
Ver ficha técnica →PCA9555PW
✅ Drop-InConsulte o preço
Ver ficha técnica →PCA9554PWR
✅ Drop-InConsulte o preço
Ver ficha técnica →PCA9539PWR Especificações
| Product Type | 16-bit general-purpose I/O expander |
| Interface | I2C/SMBus |
| Number of I/O Lines | 16 |
| Supply Voltage Range | 2.3 V to 5.5 V |
| Maximum Bus Frequency | 400 kHz |
| Interrupt Support | Yes |
| Reset Support | Yes |
| Configuração de saída | Push-pull output |
| Device Classification | CMOS interface IC |
| Encapsulamento | 24-pin TSSOP |
| Tipo de montagem | Surface mount |
| Host Compatibility | Microcontrollers and other I2C/SMBus hosts |
| I/O Mode | Input or general-purpose output |
| Address Configuration | Configurable registers; details require datasheet verification |
Guia de Configuração de Pinos do PCA9539PWR 24-pin tssop
Configuração de pinos para PCA9539PWR (pacote 24-pin tssop). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para PCA9539PWR.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
PCA9539PWR é adequado para 7 aplicaçãos: ACPI Power-Switch Control, Push-Button and Human-Interface Panel, Remote Sensor and Digital-Control Interface, LED and Indicator Control, Embedded System GPIO Expansion, Alarm and Status Reporting Module, Low-Voltage Peripheral Control.
ACPI Power-Switch Control
The PCA9539PWR fits ACPI-style power-control boards because it adds 16 digital I/O points without consuming the host MCU’s limited GPIO budget. A controller can place the expander on the I2C/SMBus and use individual lines for enable, sleep, or peripheral-control signals. Its verified 2.3 V to 5.5 V range supports mixed embedded rails, while the 400 kHz bus specification is suitable for standard control traffic. Confirm power-pin, address, and output-current details in the datasheet before layout sign-off.
Recomendado
Push-Button and Human-Interface Panel
A PCA9539PWR can consolidate up to 16 switch or keypad signals into a remote I2C/SMBus module. The host scans or receives state information through the serial interface, and the interrupt output can indicate activity without continuous polling when configured correctly. The 24-pin TSSOP package supports compact panel designs, but button bounce, debounce strategy, input thresholds, and pull-up or pull-down requirements must be verified in the manufacturer datasheet.
Recomendado
Remote Sensor and Digital-Control Interface
PCA9539PWR is useful when a sensor or control board has more digital status lines than the main controller can expose directly. A host can read sensor flags, configure relays, or monitor discrete alarms through the 16 available ports while retaining a compact serial connection. The verified 2.3 V to 5.5 V supply range covers many embedded systems, and 400 kHz operation supports normal control-loop traffic. Signal levels, direction, and interrupt behavior must be checked before connecting external equipment.
Recomendado
LED and Indicator Control
The 16 outputs of PCA9539PWR can drive control signals for LEDs, indicator lamps, or digital driver stages when the load current and polarity fall within the device’s verified limits. Grouping indicators behind an I/O expander reduces host pin usage and makes firmware state changes easy to centralize. Because the supplied data confirms push-pull outputs but does not provide output-current or absolute-maximum details, verify drive capability and use transistor or buffer stages for higher-current indicators.
Recomendado
Embedded System GPIO Expansion
PCA9539PWR provides a practical way to add 16 GPIO lines to a microcontroller, PLC, or embedded control module that already uses I2C/SMBus. This is especially useful when pin reuse has become constrained but the board still has spare two-wire bus capacity. The 24-pin TSSOP package and 2.3 V to 5.5 V operating range support compact mixed-voltage designs. Address assignment, bus pull-ups, reset timing, and input/output direction must be designed from the complete datasheet.
Recomendado
Alarm and Status Reporting Module
The PCA9539PWR can monitor multiple alarm, fault, door, presence, or system-status signals and report changes to a host through its interrupt-capable serial interface. Using one expander for several discrete lines simplifies wiring compared with dedicating a separate host pin to every signal. The verified 400 kHz I2C/SMBus capability is adequate for ordinary management traffic, while active-low or active-high interrupt polarity must be configured from the device registers and verified in firmware.
Recomendado
Low-Voltage Peripheral Control
The 2.3 V to 5.5 V operating range makes PCA9539PWR suitable for low-voltage peripheral boards that need remote digital control. It can connect battery-powered or mixed-rail logic to a host while preserving a compact serial bus. Designers should still verify the I/O voltage thresholds, power consumption, bus pull-ups, and output-drive limits in the manufacturer documentation. The device is an interface component, so final current handling must be matched to the actual load rather than assumed from the GPIO count.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PCA9539PWR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | TCA9539PWR | PCA9539PWR-T | PCA9539PWR/Q900 | PCA9555PW | PCA9554PWR |
|---|---|---|---|---|---|---|
| Package | 24-pin TSSOP | 24-pin TSSOP | 24-pin TSSOP | 24-pin TSSOP | 24-pin TSSOP | 24-pin TSSOP |
| Brand | NXP Semiconductors | Texas Instruments | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
Principais diferenciais
- NXP active product identity with verified product-page support (vs TCA9539PWR)
- Verified 16-bit I/O organization in a 24-pin TSSOP package (vs PCA9555PW)
- Interrupt and reset support explicitly identified (vs PCA9554PWR)
- 400 kHz I2C/SMBus operation (vs PCA9555PW)
Notas de projeto
Use the exact manufacturer land pattern for the 24-pin TSSOP package and confirm pin 1 orientation against the PCB assembly drawing. The verified distributor data confirms a 24-TSSOP package, but it does not provide a complete pin table. Route the I2C/SMBus pair away from noisy switching nodes, keep the reset trace short, and place required bus pull-ups and decoupling close to the device or according to the system bus design.
Do not treat a 24-pin TSSOP footprint match as proof of drop-in compatibility. The cross-reference data supports TCA9539PWR as a candidate, but address pins, interrupt polarity, reset behavior, I/O thresholds, output current, and power sequencing must be compared against both manufacturer datasheets. Also verify that the replacement’s software register map and default state match the existing firmware.
The verified device supports operation up to 400 kHz, so the PCB should preserve a clean two-wire bus and use pull-ups appropriate to the actual voltage and capacitance. Keep the bus topology short, avoid unnecessary stubs, and place pull-ups where they can effectively serve the assembled board. The exact resistance and maximum bus loading require the manufacturer datasheet and a calculation using the final board capacitance.
Design the supply rails around the verified 2.3 V to 5.5 V operating range and do not infer current capability from the 16-bit I/O count. Verify the device’s supply current, output-drive limits, absolute maximum ratings, and external-load requirements before connecting LEDs, relays, or control signals. Use transistor or buffer stages when a load exceeds the verified GPIO drive capability.
Informações de conformidade
The supplied verified data does not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status for PCA9539PWR. These fields remain unknown rather than being inferred.