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HomeProductsIntegrated Circuits (ICs)Specialized ICsPCA9555D,112
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PCA9555D,112 - NXP Semiconductors

Manufacturer Part Number
PCA9555D,112
Manufacturer
NXP Semiconductors
Allelco Part Number
41D-PCA9555D,112
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
13,630 pcs available, New & Original
Parts Description
SO-24
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
Compare
Our certification
In stock: 13630
  • Unit Price: $1.017
  • Subtotal: $0.00

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Add to Cart and Submit RFQ now, we'll contact you immediately.

Quantity Unit Price Ext. Price
1+ $1.017 $1.02
10+ $0.87 $8.70
30+ $0.79 $23.70
100+ $0.699 $69.90
500+ $0.658 $329.00
1000+ $0.64 $640.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

PCA9555D,112 Tech Specifications
NXP Semiconductors - PCA9555D,112 technical specifications, attributes, parameters and parts with similar specifications to NXP Semiconductors - PCA9555D,112

Product Attribute Attribute Value
Part Number PCA9555D,112
Package SO-24
Description SO-24
Stock Condition Get 13630 pcs available quantity at Allelco
Payment PayPal / TT / Credit Card / Western Union
Allelco Certifications ESD / ISO 9001 / ISO 13485 / ISO 28000
Product Attribute Attribute Value
Manufacturer NXP Semiconductors
RoHs Status -
Warranty 100% Perfect Functions
Transport port Hong Kong
Shipping by DHL / FedEx / UPS / TNT / SF Express
RFQ Email info@allelco.com

Parts Introduction

Manufacturer Part Number

PCA9555D,112

Manufacturer

NXP Semiconductors

Introduction

The PCA9555D,112 is a digital I/O expander from NXP Semiconductors. It provides 16 general-purpose parallel input/output (I/O) ports that can be configured in groups of 8 as either inputs or outputs. The device communicates via I2C or SMBus serial interfaces.

Product Features and Performance

16 general-purpose I/O ports that can be configured in groups of 8 as either inputs or outputs

I2C and SMBus serial interfaces

Interrupt output signal

Power-on reset (POR) function

Push-pull output type

Output source/sink current of 10 mA or 25 mA

Operating frequency up to 400 kHz

Operating voltage range of 2.3 V to 5.5 V

Operating temperature range of -40°C to +85°C

Product Advantages

Flexible I/O configuration

Wide operating voltage and temperature ranges

Interrupt output for event detection

POR function for reliable startup

High output current capability

Key Reasons to Choose This Product

Versatile I/O expander with a wide range of features

Suitable for various applications that require parallel digital I/O expansion

Robust performance and reliability due to the wide operating specifications

Easy integration into I2C or SMBus-based systems

Quality and Safety Features

Compliant with relevant industry standards

Robust design for reliable operation

Extensive testing and validation processes

Compatibility

The PCA9555D,112 is compatible with I2C and SMBus serial communication interfaces, making it suitable for integration into a wide range of embedded systems and applications.

Application Areas

Industrial automation and control

Telecommunications equipment

Consumer electronics

Automotive electronics

Robotics and mechatronics

Product Lifecycle

The PCA9555D,112 is an active product and is currently available for purchase. There are several alternative models from the PCA9555 series that provide similar functionality and may be suitable for certain applications. Customers are advised to contact our website's sales team for the latest product information and availability.

Frequently Asked Questions(FAQ)

How does the PCA9555D,112 support system initialization in power-sensitive applications?
The PCA9555D,112 includes a Power-On Reset (POR) feature that ensures all I/O pins are configured as inputs with pull-up resistors disabled at startup. This prevents unintended current draw during power ramp-up and avoids bus contention on the I2C/SMBus lines. The POR signal resets the internal registers to a known state, which is particularly valuable in systems requiring strict power sequencing or operating across a wide supply range of 2.3V to 5.5V.
What are the key differences between using the PCA9555D,112 and a discrete GPIO expander solution?
While discrete GPIO solutions may offer lower cost for small-scale designs, the PCA9555D,112 integrates a full I2C/SMBus interface controller, open-drain or push-pull outputs, interrupt logic, and built-in protection features such as overcurrent detection and thermal shutdown. It reduces board space by nearly 50% compared to equivalent discrete designs and simplifies firmware development with standardized addressing and register mapping. For systems requiring 16 bidirectional I/Os with interrupt capability, the integrated nature of the PCA9555D,112 reduces both component count and design risk.
Can the PCA9555D,112 drive high-current loads directly from its output pins?
No, the PCA9555D,112 has specified output current capability of up to 10mA source and 25mA sink per pin, which is suitable for driving LEDs, relays, or low-power logic signals. Attempting to drive heavier loads—such as motors or solenoids—without external buffering will likely exceed the device’s absolute maximum ratings and result in damage. In such cases, a MOSFET or transistor stage should be used, with the PCA9555D,112 providing gate control via its push-pull outputs.
How does the interrupt functionality of the PCA9555D,112 improve system responsiveness?
The PCA9555D,112 provides an active-low interrupt output that signals the host microcontroller when any input pin state changes. This allows the main processor to remain in sleep mode until an event occurs, significantly reducing power consumption. For example, in a battery-powered IoT sensor node, the interrupt can wake the MCU only when a button is pressed or a status flag changes, extending operational life by orders of magnitude compared to polling-based approaches.
Is the PCA9555D,112 suitable for automotive-grade temperature environments?
The PCA9555D,112 operates from -40°C to +85°C, which covers industrial temperature ranges but falls short of AEC-Q100 Grade 2 requirements (typically -40°C to +105°C). Therefore, it is not qualified for most automotive applications without additional environmental stress screening. Engineers targeting automotive systems should consider alternative parts like the PCA9537D or similar AEC-compliant variants if extended temperature reliability is required.
How many unique I2C addresses can the PCA9555D,112 support in a multi-device configuration?
The PCA9555D,112 uses a 3-bit address pin configuration, allowing for up to eight distinct I2C addresses within a single SMBus/I2C bus segment. This enables multiple units to coexist on the same bus without conflicts—critical in complex systems such as sensor arrays or peripheral expansion boards where space and wiring complexity must be minimized.
What happens if the I2C clock frequency exceeds 400 kHz when using the PCA9555D,112?
The PCA9555D,112 is specified for operation up to 400 kHz standard-mode I2C communication. Operating above this frequency risks violating timing margins due to internal propagation delays and setup/hold constraints, potentially leading to data corruption or communication failures. While some implementations might tolerate brief bursts above 400 kHz under ideal conditions, sustained use beyond specification limits compromises reliability and violates compliance with SMBus standards.
How does the PCA9555D,112 handle voltage translation between different logic levels?
The PCA9555D,112 supports supply voltages from 2.3V to 5.5V independently on its VDD and AVSS pins. However, it does not inherently provide level shifting between buses; if interfacing between 3.3V and 5V systems, external level translators are recommended unless one side operates within the other's acceptable input threshold range. Careful attention to VIH/VIL specifications across devices ensures robust interoperability without relying solely on internal clamping diodes.
Can the PCA9555D,112 be used in hot-swappable peripheral expansion scenarios?
Yes, but with caution. The device includes ESD protection and soft-start behavior via POR, making it relatively tolerant to transient events. However, hot-plugging into an active I2C bus without proper slew-rate limiting or pull-up resistor adjustment can still cause glitches. Adding series termination resistors (~100Ω) near each pull-up network and ensuring gradual enable/disable sequences improves robustness in dynamic plug-and-play environments.
Why might an engineer choose SOIC packaging over smaller alternatives for the PCA9555D,112?
Although smaller packages like TSSOP or DFN exist for comparable ICs, the 24-SOIC (7.5mm width) form factor offers superior thermal dissipation, easier manual soldering, and better mechanical stability during automated assembly. Given the moderate power dissipation of the PCA9555D,112 (<100mW typical), the larger footprint provides margin for long-term reliability without requiring advanced PCB layout techniques.
Does the PCA9555D,112 require external components for basic operation?
For minimal configurations, only external pull-up resistors on the SDA and SCL lines are typically needed, along with decoupling capacitors near the VDD pin. The internal oscillator and reset circuitry eliminate the need for external clocks or reset circuits. However, adding bulk capacitance (>1µF) close to the power rail enhances noise immunity in electrically noisy environments such as motor-driven systems.
How does the Moisture Sensitivity Level (MSL) rating affect handling of the PCA9555D,112?
With an MSL rating of 1 (unlimited floor life), the PCA9555D,112 can be stored indefinitely at room temperature before reflow soldering without requiring baking. This simplifies inventory management and reduces processing steps in high-volume manufacturing, especially beneficial for just-in-time supply chains where storage logistics are constrained.
What considerations apply when cascading multiple PCA9555D,112 devices on a shared bus?
When connecting several PCA9555D,112 units, ensure that total bus capacitance remains below 400pF to maintain 400kHz operation. Use individual pull-ups per device if possible, or strategically sized global pull-ups based on measured capacitance. Avoid daisy-chaining interrupt lines unless buffered, as excessive capacitive loading degrades rise times and increases risk of false triggers during simultaneous transitions.
Is there a difference in performance between using I2C versus SMBus protocols with the PCA9555D,112?
Functionally identical; the PCA9555D,112 implements both I2C and SMBus-compliant interfaces operating at up to 400kHz. The choice depends on host controller support and application requirements such as alert response time or voltage monitoring. SMBus adds optional features like alert response addressing but offers no inherent speed advantage—both modes share the same underlying timing parameters and electrical characteristics.

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
  • Payment Support
  • Packaging
  • Certifications & Memberships

QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
  1. Visual inspection
  2. Performance testing and reliability verification
  3. Standardized full-process testing
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We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
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Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
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  • ISO 28000: 2007
  • ISO 45001: 2018
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  • IPC
  • ESD
  • PSMA
NXP Semiconductors

PCA9555D,112

NXP Semiconductors
41D-PCA9555D,112

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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