About us Contact Us Submit BOM
RFQs(0)
English
Close Menu
View All

Please refer to the English Version as our Official Version.Return

Europe
France(Français) Germany(Deutsch) Italy(Italia) Russian(русский) Poland(polski) Czech(Čeština) Luxembourg(Lëtzebuergesch) Netherlands(Nederland) Iceland(íslenska) Hungarian(Magyarország) Spain(español) Portugal(Português) Turkey(Türk dili) Bulgaria(Български език) Ukraine(Україна) Greece(Ελλάδα) Israel(עִבְרִית) Sweden(Svenska) Finland(Svenska) Finland(Suomi) Romania(românesc) Moldova(românesc) Slovakia(Slovenská) Denmark(Dansk) Slovenia(Slovenija) Slovenia(Hrvatska) Croatia(Hrvatska) Serbia(Hrvatska) Montenegro(Hrvatska) Bosnia and Herzegovina(Hrvatska) Lithuania(lietuvių) Spain(Português) Switzerland(Deutsch) United Kingdom(English)
Asia/Pacific
Japan(日本語) Korea(한국의) Thailand(ภาษาไทย) Malaysia(Melayu) Singapore(Melayu) Vietnam(Tiếng Việt) Philippines(Pilipino)
Africa, India and Middle East
United Arab Emirates(العربية) Iran(فارسی) Tajikistan(فارسی) India(हिंदी) Madagascar(malaɡasʲ)
South America / Oceania
New Zealand(Maori) Brazil(Português) Angola(Português) Mozambique(Português)
North America
United States(English) Canada(English) Haiti(Ayiti) Mexico(español)
HomeProductsIntegrated Circuits (ICs)Interface - I/O ExpandersPCA9555DWR
PCA9555DWR Image
PCA9555DWR Image - 1
Image may be representation.
See specifications for product details.
Share
 Favorite
EXPRESS OPTION
Payment method

PCA9555DWR - Texas Instruments

Manufacturer Part Number
PCA9555DWR
Manufacturer
Texas Instruments
Allelco Part Number
32D-PCA9555DWR
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
41,340 pcs available, New & Original
Parts Description
IC XPNDR 400KHZ I2C SMBUS 24SOIC
Package
24-SOIC
Data sheet
PCA9555DWR.pdf

HTML Datasheet

PCA9555.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 41340
  • Unit Price: $1.265
  • Subtotal: $0.00

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

Quantity Unit Price Ext. Price
1+ $1.265 $1.27
10+ $1.085 $10.85
30+ $0.974 $29.22
100+ $0.859 $85.90
500+ $0.807 $403.50
1000+ $0.784 $784.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

PCA9555DWR Tech Specifications
Texas Instruments - PCA9555DWR technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - PCA9555DWR

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Supply 2.3V ~ 5.5V
Supplier Device Package 24-SOIC
Series -
Package / Case 24-SOIC (0.295', 7.50mm Width)
Package Tape & Reel (TR)
Output Type Push-Pull
Operating Temperature -40°C ~ 85°C
Product Attribute Attribute Value
Number of I/O 16
Mounting Type Surface Mount
Interrupt Output Yes
Interface I²C, SMBus
Features POR
Current - Output Source/Sink 10mA, 25mA
Clock Frequency 400 kHz
Base Product Number PCA9555

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

PCA9555DWR Image
PCA9555DWR (1)

Manufacturer Part Number

PCA9555DWR

Manufacturer

Texas Instruments

Introduction

I2C and SMBus-compatible interface expander with 16 I/O pins

Product Features and Performance

16 I/O pins expandable via I2C bus

Interrupt output for input change notification

Configurable polarity inversion register

Power-on reset (POR)

Product Advantages

Conserves microcontroller I/Os for other functions

Allows for serial interface to parallel expansion

Supports hot insertion

Key Technical Parameters

Number of I/O: 16

Interface: I2C, SMBus

Interrupt Output: Yes

Output Type: Push-Pull

Current - Output Source/Sink: 10mA, 25mA

Clock Frequency: 400 kHz

Voltage - Supply: 2.3V ~ 5.5V

Operating Temperature: -40°C ~ 85°C

Quality and Safety Features

Over-voltage tolerant inputs

Low standby current

Noise filter on SCL/SDA inputs

Compatibility

Interfacing with microcontrollers and processors that utilize I2C or SMBus

Application Areas

Keyboard extensions for microcontrollers

LED indicators and displays

Industrial control systems

Server management

Product Lifecycle

Active product status

No reported discontinuation or obsolescence

Several Key Reasons to Choose This Product

Flexible usage across wide voltage range (2.3V to 5.5V)

High I/O pin count ideal for complex systems

Robust design suitable for industrial applications

Compatible with popular communication protocols

Easy to mount with surface-mount technology

Efficient power management with low standby current

Enables sophisticated system monitoring with interrupt output feature

Frequently Asked Questions(FAQ)

How does the PCA9555DWR’s 400 kHz I2C interface compare to standard-speed I2C devices in terms of bus loading and system throughput for a 16-channel GPIO expander application?
The PCA9555DWR operates at 400 kHz, which is double the traditional 100 kHz standard-speed I2C. This enables faster register reads and writes across its 16 bidirectional I/O lines, reducing latency when polling multiple sensors or driving status LEDs. In a typical design with three PCA9555DWRs on the same bus, this higher clock rate allows each device to transmit 16 bytes of port state data in approximately 2.6 milliseconds per poll cycle—compared to over 5 ms at 100 kHz—without violating I2C timing margins. However, it increases susceptibility to noise on long traces, so layout and pull-up resistor selection become more critical than with slower variants.
What are the key differences between the PCA9555DWR and alternative I/O expanders like the MAX7311AWG+ when selecting a solution for industrial automation requiring hot-swap protection?
While both the PCA9555DWR and MAX7311AWG+ offer 16-bit I/O and SMBus compatibility, the MAX7311AWG+ includes integrated ESD protection up to ±8 kV and built-in slew-rate control on outputs, making it better suited for environments with frequent connector insertions. The PCA9555DWR lacks these protections but offers broader voltage flexibility (2.3V–5.5V vs. fixed 3.3V operation) and a dedicated Power-On Reset (POR) feature that ensures predictable initialization during brownouts—a benefit in battery-powered or unstable supply systems common in industrial edge nodes.
Can the PCA9555DWR safely drive inductive loads such as relays directly from its push-pull outputs without additional buffering?
No, direct switching of inductive loads like relays or solenoids is not recommended due to back-EMF risks. Although the PCA9555DWR supports sink/source currents up to 25 mA and 10 mA respectively, inductive kick can exceed internal clamp ratings and damage the die. For such applications, external MOSFETs or optoisolators should be used, with flyback diodes across the load. A typical implementation might use a logic-level N-channel MOSFET driven by one PCA9555DWR output, limiting the expander’s role to gate control while handling power transfer externally.
What happens to the interrupt output of the PCA9555DWR if multiple input pins change state simultaneously during a rapid signal transition sequence?
The PCA9555DWR generates a single interrupt pulse on its INTA pin whenever any enabled input changes, regardless of how many pins toggle. It does not report per-pin delta or aggregate event counts. Therefore, in scenarios with high-frequency chatter (e.g., debouncing mechanical switches), consecutive interrupts may occur, but each will reflect only that *some* input changed—not which ones. Applications requiring granular event logging must read the input port register immediately after detecting the interrupt to capture the full snapshot.
Is it feasible to cascade multiple PCA9555DWR devices on a shared I2C bus without address conflicts in a multi-drop configuration?
Yes, up to eight PCA9555DWR devices can coexist on an I2C bus using their programmable 7-bit slave addresses (A0–A2 pins). Each address corresponds to a unique combination of logic levels on those three pins. For example, setting A0=high, A1=low, A2=ground assigns address 0x41, allowing a second device with A0=low, A1=high, A2=ground to use 0x42. Proper isolation resistors (~1 kΩ) on SDA/SCL lines prevent contention, especially when mixing different expander models. Always verify timing budgets under worst-case capacitive loads (typically <400 pF for reliable 400 kHz operation).
How does the PCA9555DWR’s operating temperature range (-40°C to +85°C) impact reliability in automotive-grade versus commercial embedded systems?
Though rated for industrial temperatures, the PCA9555DWR is not qualified to AEC-Q100 standards, so its long-term drift and electromigration characteristics may degrade outside controlled lab conditions. In commercial embedded systems with stable thermal environments, it performs reliably within spec. However, in automotive applications subject to wide ambient swings and vibration, supplemental thermal management or derating of output current (e.g., limiting to 15 mA instead of 25 mA) is advisable to maintain junction stability and avoid latch-up events near upper temperature limits.
When configuring the PCA9555DWR for open-drain outputs, what pull-up strategy minimizes rise time while avoiding excessive quiescent current in battery-powered designs?
For open-drain configurations, external pull-ups between VDD (2.3–5.5V) and outputs typically range from 10 kΩ to 100 kΩ depending on bus speed and load capacitance. At 400 kHz, a 4.7 kΩ resistor provides adequate rise times (<300 ns) for most capacitive loads (<100 pF), whereas larger values save power but risk violating setup/hold times. In ultra-low-power modes, dynamic enabling of pull-ups via software reduces average consumption—only activate them during active communication phases. Avoid hardwired strong pull-ups unless absolutely necessary, as they increase standby current even when outputs are inactive.
Does the PCA9555DWR support glitch filtering or debounce logic internally, and how should external filtering be implemented for noisy industrial inputs?
The PCA9555DWR has no built-in debounce or glitch suppression beyond basic Schmitt-trigger input buffers. External RC networks (e.g., 10 kΩ series resistor + 0.1 µF capacitor to ground) can filter transient spikes shorter than ~1 ms. Alternatively, firmware-based sampling at intervals greater than twice the expected signal period avoids missed edges while eliminating bounce artifacts. For safety-critical contacts, consider dedicated debounce ICs or FPGA-based state machines rather than relying solely on software timing, especially under variable processor load conditions.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments PCA9555DWR

Product Attribute PCA9555DWRG4 PCA9555DBR PCA9555DW PCA9555DBQRG4
Part Number PCA9555DWRG4 PCA9555DBR PCA9555DW PCA9555DBQRG4
Manufacturer Texas Instruments Texas Instruments Texas Instruments Luminary Micro / Texas Instruments
Base Product Number - DAC34H84 MAX500 ADS62P42
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Mounting Type - Surface Mount Through Hole Surface Mount
Interface - - - -
Current - Output Source/Sink - - - -
Number of I/O - - - -
Voltage - Supply - - - -
Clock Frequency - - - -
Features - - - Simultaneous Sampling
Output Type - Current - Unbuffered Voltage - Buffered -
Interrupt Output - - - -
Series - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

PCA9555DWR Datasheet PDF

Download PCA9555DWR pdf datasheets and Texas Instruments documentation for PCA9555DWR - Texas Instruments.

PCN Design/Specification
Datasheet Update 25/Jun/2014.pdf PCA9555 04/Sep/2018.pdf
HTML Datasheet
PCA9555.pdf

Customers Also Interested in

Recommended Products

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.

Write a Review

Your Email address will not be published.

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
  4. Precise control of every parameter
We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
Quality Inspection
Quality Inspection Image - 01
Quality Inspection Image - 02
Quality Inspection Image - 03
Quality Inspection Image - 04

Payment Support

The payment method can be chosen from the methods shown below: Wire Transfer (T/T, Bank Transfer), Western Union, Credit card, PayPal.
  • HKBea
  • Paypal
  • MasterCard
  • Western-Union
  • VISA
Stable Delivery, Sincere Partnership — Your Faithful Supply Chain Partner
  • Efficient Supply Management
  • Cost-Saving Procurement
  • Fast Sourcing & Delivery
Contact us if you have any questions.

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
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
  • SMTA
  • IPC
  • ESD
  • PSMA
PCA9555DWR Image

PCA9555DWR

Texas Instruments
32D-PCA9555DWR

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

Allelco
About Us
History
Certifications
Recruitment
Policies
Terms & Conditions
Privacy Policy
Cookie Policy
Services
Order Tracking
Return & Replacement
Frequently Asked Questions
Contact Us
Order
Shipping & Delivering
Payment Methods
My Account
The BlogsHot PartsChange LanguageNewsSite map
Contact Us
Headquarters Address:
Room C 13/F Harvard Commercial Building
105-111 Thomson Road Wan Chai
HongKong
Service Tel: +852-91464856
Service Email: info@allelco.com
Follow us
Copyright © 2012-2025 AllelcoElec.com. All rights reserved.
0 RFQ
Shopping cart (0 Items)
It is empty.
Submit RFQ
Compare List (0 Items)
It is empty.
Feedback

Your feedback matters! At Allelco, we value the user experience and strive to improve it constantly.
Please share your comments with us via our feedback form, and we'll respond promptly.
Thank you for choosing Allelco.

Subject
E-mail
Comments
Captcha
Drag or click to upload file
Upload File
types: .xls, .xlsx, .doc, .docx, .jpg, .png and .pdf.
Max file size: 10MB