PCA9554D - 8-Bit I2C/SMBus GPIO Expander | NXP
料号： PCA9554D ✗ 停产PCA9554D 概述
直接替换替代料： PCA9554D ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PCA9554D （相同外形与封装尺寸） ——差异在于 Package.
PCA9554ABS3,118
✅ 直接替换联系询价
查看数据手册 →PCA9554D,118
✅ 直接替换📋 参考替代料（不在目录中）
PCA9554D
✅ 直接替换联系询价
查看数据手册 →PCA9554ABS3,118
✅ 直接替换联系询价
查看数据手册 →PCA9516AD,112
✅ 直接替换📋 参考替代料（不在目录中）
PCA9541AD/03,118
✅ 直接替换📋 参考替代料（不在目录中）
PCA9554D 规格参数
| Device Type | 8-bit I2C-bus/SMBus I/O expander with interrupt |
| Number of I/O Lines | 8 bits |
| Bus Interface | I2C and SMBus |
| I2C Maximum Frequency | 400 kHz |
| 封装 | SO16, 16 pins |
| Device Technology | CMOS |
| Host Bus Connections | Serial I2C/SMBus interface for host communication |
| Parallel Port Connections | 8 configurable general-purpose I/O lines |
| Interrupt Function | Yes; interrupt output available |
| 生命周期状态 | End of Life, according to the NXP product information search result |
PCA9554D so16, 16 pins 引脚配置指南
PCA9554D（so16, 16 pins 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： PCA9554D.
请参阅 数据手册 以查看完整引脚配置。
典型应用
PCA9554D 适用于 7 应用s: Microcontroller GPIO Expansion, Industrial Control Signal Interface, LED and Indicator Control, Remote Input Monitoring, Embedded Control Panel, Instrumentation and Test Equipment, Battery-Powered Portable System.
Microcontroller GPIO Expansion
The PCA9554D is useful when a microcontroller needs additional control or monitoring points without consuming native GPIO pins. Its eight I/O lines are connected over I2C/SMBus, while the interrupt line can notify the host when a monitored input changes. The verified source data confirms 8-bit expansion, interrupt support, and 400 kHz I2C operation, but the engineer should verify output-drive limits and exact pin behavior in the NXP datasheet before driving loads.
推荐
Industrial Control Signal Interface
PCA9554D can act as a compact serial-to-parallel interface between a controller and industrial equipment requiring several discrete control points. The eight GPIO lines can represent enables, status inputs, or relay-driver commands, while the interrupt output reduces unnecessary polling. Because the verified data does not state the output current, input voltage range, or temperature limits, the final design must use the manufacturer datasheet and add suitable driver circuitry for inductive or high-current loads.
推荐
LED and Indicator Control
The PCA9554D can provide configurable output states for LEDs, indicators, or digital control signals when the current and voltage requirements are within the device's verified electrical limits. Since those output limits are not included in the supplied data, designers should not connect loads directly without checking the datasheet. A low-current indicator arrangement may use the GPIO outputs with suitable series resistance, while larger LED banks should use transistor driver stages and separate supply rails.
推荐
Remote Input Monitoring
The PCA9554D is well suited to monitoring multiple external status signals over a short I2C bus. The host can read port state through the serial interface and use the interrupt output to avoid repeated polling when a monitored line changes. This is useful in equipment with limit switches, interlocks, or sensor-enable signals, provided the input voltage, pull-up configuration, and logic thresholds are confirmed from the NXP documentation.
推荐
Embedded Control Panel
A PCA9554D can expand a compact controller into a configurable control-panel interface by connecting buttons, selectors, indicators, and output-enable signals. The eight GPIO lines provide parallel access while I2C carries configuration from the host, and the interrupt feature supports prompt notification of input events. Product planning must account for the NXP End of Life status and confirm the exact package, address, and pinout with current manufacturer documentation.
推荐
Instrumentation and Test Equipment
In instrumentation, the PCA9554D can centralize front-panel status and control lines while reducing the number of pins required from the main controller. Its interrupt capability supports event-driven handling of switches or external conditions, and the confirmed 400 kHz I2C rating fits many embedded control systems. The device should be used only after verifying noise, supply-voltage, timing, and logic-level requirements in the relevant application and datasheet.
推荐
Battery-Powered Portable System
PCA9554D can reduce host GPIO usage in a portable or battery-powered embedded system where connector and status lines are more numerous than available controller pins. The I2C interface keeps wiring and pin count manageable, while the interrupt line allows event-driven operation instead of continuous polling. The supplied data does not provide standby current, active current, or supply-voltage specifications, so battery-life and power-budget calculations require the official NXP datasheet.
推荐
推荐产品汇总
工程参考数据： PCA9554D ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PCA9554A | PCA9554D,118 | PCA9554 |
|---|---|---|---|---|
| Device Type | 8-bit I2C/SMBus I/O expander with interrupt | 8-bit I2C/SMBus I/O expander; address differs from PCA9554D | PCA9554D orderable suffix | 8-bit I2C/SMBus I/O expander with interrupt |
| GPIO Count | 8 bits | 8 bits | 8 bits | 8 bits |
| I2C/SMBus Support | I2C and SMBus | I2C and SMBus | I2C and SMBus | I2C and SMBus |
| Interrupt | Yes | Yes | Yes | Yes |
| Package | SO16 | SO16 | SO16 | SO16 |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Texas Instruments |
关键差异点
- Directly identified 8-bit I2C/SMBus expansion with interrupt （对比 PCA9554)
- Known address distinction from PCA9554A （对比 PCA9554A)
- SO16 package alignment （对比 PCA9554D,118)
设计说明
Do not substitute PCA9554A without checking the I2C address and firmware configuration. NXP's verified product information explicitly notes that PCA9554D has a different address from PCA9554A. Even when the package and family function appear similar, an address change can prevent the host from detecting the device, cause bus conflicts, or require source-code changes. Compare the address pins, power-up defaults, register map, and interrupt polarity against the current datasheet.
Keep the PCA9554D's I2C traces short and route them away from noisy switching nodes and high-current relay or motor paths. Confirm the required pull-up voltage and resistor values from the complete electrical specification, because the supplied data does not include them. Place the device close to the controlled connector or sensor group when possible, and provide a common ground reference between the expander and the host controller.
Treat the eight GPIO lines as logic signals unless the manufacturer datasheet proves otherwise. The supplied sources do not specify output current, output voltage, or absolute maximum ratings, so LEDs, relays, solenoids, and other high-energy loads should use suitable driver circuits. Estimated design rule: size any driver stage from the load's worst-case voltage and current rather than from the nominal 5 V control rail, and account for inductive flyback protection.
Because NXP labels PCA9554D End of Life, purchasing decisions should include lifecycle risk, lot traceability, and authorized sourcing. A distributor page may show stock without proving the package suffix, date code, or condition. Do not treat a generic cross-reference result as proof of equivalence; inspect the official NXP product-change and replacement information and perform a hardware review against the original schematic and firmware.
合规信息
The supplied verified data does not include specific RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 declarations. NXP identifies the product as End of Life; compliance must be confirmed from current manufacturer documentation and the applicable supply-chain records.
