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HomeProductsIntegrated Circuits (ICs)Interface - I/O ExpandersPCA9555DWRG4
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PCA9555DWRG4 - Texas Instruments

Manufacturer Part Number
PCA9555DWRG4
Manufacturer
Texas Instruments
Allelco Part Number
98D-PCA9555DWRG4
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
9,087 pcs available, New & Original
Parts Description
IC XPNDR 400KHZ I2C SMBUS 24SOIC
Package
24-SOIC
Data sheet
PCA9555DWRG4.pdf

HTML Datasheet

PCA9555.pdf
RoHs Status
ROHS3 Compliant
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In stock: 9087
  • Unit Price: $0.997
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $0.997 $1.00
200+ $0.386 $77.20
500+ $0.373 $186.50
1000+ $0.366 $366.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

PCA9555DWRG4 Tech Specifications
Texas Instruments - PCA9555DWRG4 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - PCA9555DWRG4

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

Frequently Asked Questions(FAQ)

How does the PCA9555DWRG4 handle input signal integrity when used with long I2C bus traces in a high-noise industrial environment?
The PCA9555DWRG4 supports a 400 kHz I2C interface with built-in noise immunity features, including Schmitt-trigger inputs and programmable pull-up control. In extended trace scenarios, the device maintains reliable communication by tolerating voltage levels above VCC + 0.3V and below GND - 0.3V, effectively filtering minor transients. However, for traces exceeding 1 meter, external pull-up resistors should be carefully selected to balance rise time against noise susceptibility, typically using values between 2.2 kΩ and 4.7 kΩ depending on bus capacitance.
What are the key differences in interrupt behavior between the PCA9555DWRG4 and PCA9555DWR when handling asynchronous input events across multiple GPIOs?
Both variants share identical interrupt logic, but the PCA9555DWRG4 includes a standardized package marking and full TI manufacturing traceability, which can affect thermal performance under continuous interrupt load. When configured for edge-triggered interrupts, each of the 16 I/O lines can independently generate a low-level active interrupt signal via the INT output. The interrupt status register allows polling without clearing flags, enabling safe multithreaded handling—critical in systems where multiple sources may trigger simultaneously.
Can the PCA9555DWRG4 drive inductive loads such as relays directly, and what are the derating considerations for sustained switching at 25mA sink current?
While the PCA9555DWRG4 specifies a 25mA sink capability per pin, direct driving of inductive loads like relays is not recommended due to back-EMF risks. For relay applications, an external transistor stage is required. Assuming a typical 12V relay coil drawing 20mA, the internal ESD protection diodes will conduct during turn-off, but prolonged operation near the 25mA limit increases junction temperature. With ambient operating temperatures up to 85°C and a θJA of approximately 100°C/W in SOIC packaging, continuous conduction above 15mA per pin should be avoided to maintain reliability margins.
How does the power-on-reset (POR) feature in the PCA9555DWRG4 ensure stable initialization during brown-out conditions in battery-powered designs?
The PCA9555DWRG4 incorporates a POR circuit that holds all outputs in a high-impedance state until supply voltage exceeds 2.0V (typical), preventing false triggering during undervoltage events. This ensures predictable startup behavior even if the host microcontroller resets before completing I2C configuration. During system recovery from deep sleep, the expander retains its register contents only if VCC remains above 1.8V, so brown-out detection must be coordinated with the main controller’s reset sequence.
What is the maximum allowable bus capacitance for reliable 400 kHz operation with the PCA9555DWRG4, and how does this impact PCB layout decisions?
The PCA9555DWRG4 complies with I2C Fast Mode specifications, which limit total bus capacitance to 400 pF. Exceeding this degrades signal rise times and risks violating timing budgets. Each 24-SOIC footprint contributes approximately 3–5 pF to stray capacitance. Therefore, in multi-device systems, distributed pull-ups or bus buffers may be necessary. For example, connecting four PCA9555DWRG4 devices along with two other slaves could approach the 400 pF limit, necessitating careful net routing and possibly series termination.
Does the PCA9555DWRG4 support hot-swapping of peripheral boards without risking latch-up or damage to the I2C lines?
The PCA9555DWRG4 has standard CMOS input protection rated for ±0.3V beyond VCC and GND, but it does not include dedicated hot-swap circuitry. Insertion of a powered board into an active I2C bus can cause contention if both sides drive SDA/SCL. To mitigate this, use level-shifting buffers with enable control or implement open-drain isolation diodes. Hot-swapping is feasible only if the host side actively releases the bus before insertion, as the PCA9555DWRG4 itself cannot detect or prevent bus conflicts during simultaneous assertion.
How does the voltage translation capability of the PCA9555DWRG4 compare when interfacing a 3.3V MCU to legacy 5V peripherals?
The PCA9555DWRG4 operates from 2.3V to 5.5V and supports bidirectional voltage translation on its GPIOs without external components. Inputs tolerate up to 5.5V even when VCC is as low as 2.3V, allowing seamless interfacing between 3.3V logic and 5V sensors or switches. However, output voltages follow the local VCC rail—so if the expander is powered at 3.3V, it cannot directly drive 5V inputs requiring >2.4V HIGH threshold unless pulled up appropriately.
What are the thermal implications of continuously sourcing 10mA from all 16 GPIOs on the PCA9555DWRG4 in a sealed enclosure at 70°C ambient?
At 10mA per pin × 16 pins = 160mA total output current, power dissipation in the 24-SOIC package is approximately 160mA × VCC² / efficiency factor, though actual losses depend on load type. Assuming resistive loads and VCC = 3.3V, static power is negligible (<1mW), but dynamic switching generates heat proportional to frequency. With θJA ~100°C/W, even small leakage currents can elevate die temperature. At 70°C ambient, junction temperature may reach 80–85°C under full load, approaching the 85°C maximum rating. Adequate airflow or reduced duty cycle is advised for long-term reliability.
Can the PCA9555DWRG4 be used in automotive applications requiring AEC-Q100 qualification, or are there limitations based on TI’s commercial-grade specification?
The PCA9555DWRG4 is classified as a commercial-grade component and is not qualified under AEC-Q100. Its operating temperature range (-40°C to 85°C) matches some automotive infotainment requirements but falls short of full automotive-grade (-40°C to +125°C). For safety-critical systems, consider automotive-specific alternatives like the TCA9406 or dedicated ISO-compliant expanders. Using the PCA9555DWRG4 in automotive environments introduces validation risk unless additional environmental testing confirms robustness beyond datasheet limits.
How does the interrupt latency of the PCA9555DWRG4 behave when responding to a rising edge on Pin 7 while the I2C bus is busy transmitting data?
Interrupt response time on the PCA9555DWRG4 is independent of I2C activity. Once an edge is detected on any GPIO configured for interrupt mode, the internal comparator triggers within 50 ns, asserting the INT pin regardless of ongoing transactions. However, the host microcontroller must still read the interrupt source register over I2C, introducing latency dependent on clock stretching and bus arbitration. In worst-case scenarios with repeated START conditions, the effective response delay may extend to hundreds of microseconds, but the hardware interrupt path itself remains fast and deterministic.
Is it possible to cascade multiple PCA9555DWRG4 devices on the same I2C bus without address conflicts, and how many unique addresses are available?
Yes, up to eight PCA9555DWRG4 devices can coexist on one I2C bus using their 3-bit address pins (A0–A2). With three address lines, 8 combinations are possible, though one is reserved for general call addressing. This allows scalable expansion in modular designs—for instance, six PCA9555DWRG4 units can control 96 discrete I/Os across two buses or a single bus with address multiplexing. Address selection must avoid overlap; tie unused pins to VCC or GND consistently across devices.
What precautions should be taken when soldering the PCA9555DWRG4 in mass production to avoid package delamination or solder bridging?
The PCA9555DWRG4 uses a standard 24-lead SOIC package with a maximum reflow temperature of 260°C. Exceeding this can compromise epoxy integrity. Use SAC305 lead-free solder with peak temperatures ≤245°C and dwell time <60 seconds. To prevent bridging, apply flux with fine-tip nozzles and inspect under magnification post-reflow. MSL Level 1 allows unlimited storage, but preheating is recommended if moisture content exceeds 0.1% to avoid popcorning during reflow.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments PCA9555DWRG4

Product Attribute PCA9555DBQRG4 PCA9555DWG4 PCA9555DWR PCA9555DW
Part Number PCA9555DBQRG4 PCA9555DWG4 PCA9555DWR PCA9555DW
Manufacturer Luminary Micro / Texas Instruments Luminary Micro / Texas Instruments Texas Instruments Texas Instruments
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Mounting Type - Surface Mount Through Hole Surface Mount
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Clock Frequency - - - -
Number of I/O - - - -
Voltage - Supply - - - -
Interrupt Output - - - -
Series - - - -
Features - - - Simultaneous Sampling
Base Product Number - DAC34H84 MAX500 ADS62P42
Current - Output Source/Sink - - - -
Interface - - - -
Output Type - Current - Unbuffered Voltage - Buffered -

PCA9555DWRG4 Datasheet PDF

Download PCA9555DWRG4 pdf datasheets and Texas Instruments documentation for PCA9555DWRG4 - Texas Instruments.

HTML Datasheet
PCA9555.pdf

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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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Region Country Logistic Time(Day)
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Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
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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.
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PCA9555DWRG4 Image

PCA9555DWRG4

Texas Instruments
98D-PCA9555DWRG4

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

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