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NXP Semiconductors PCA9539RBS,118
- Part No.:
- PCA9539RBS,118
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
PCA9539RBS,118.pdf
- Description:
- IC XPND 400KHZ I2C SMBUS 24HVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,825
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Product details
Overview
PCA9539RBS,118 from NXP Semiconductors is a 24-pin HVQFN-packaged 16-bit I²C/SMBus GPIO expander with active-low interrupt and hardware reset, operating from 2.3 V to 5.5 V, featuring 5 V tolerant I/Os, polarity inversion registers, and noise-filtered SCL/SDA inputs - deployed in industrial sensor hubs and embedded control panels requiring low-power remote I/O expansion.
For engineers reviewing the PCA9539RBS,118 datasheet, PCA9539RBS,118 pinout, PCA9539RBS,118 application, or PCA9539RBS,118 equivalent, this device delivers deterministic I²C-bus interface recovery via its dedicated RESET pin, retains I/O state across reset, supports up to four devices on one bus via A0/A1 address selection, and enables robust input monitoring with open-drain INT output.
Technical Context
The PCA9539RBS,118 implements two independent 8-bit I/O ports (Port 0 and Port 1), each with configurable direction (input/output) via dedicated configuration registers, polarity inversion per bit, and separate input/output data registers. Its I²C slave address is fixed at 11101xx (7-bit), programmable via A0 and A1 pins.
Unlike the PCA9539, the PCA9539R variant resets only the I²C-bus state machine on RESET assertion - internal general-purpose registers (I/O configuration, output data, polarity) remain unchanged - enabling safe I²C recovery without disrupting external signal states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I/O Count | 16 bidirectional GPIOs (8 per port), defaulting to high-impedance inputs at power-on reset |
| Supply Voltage | 2.3 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V logic domains |
| I/O Tolerance | 5 V tolerant - allows connection to 5 V peripherals even when VDD = 3.3 V |
| I²C Speed | 0 Hz to 400 kHz - compatible with standard and fast-mode I²C buses |
| Interrupt Output | Active-low open-drain INT - asserts when any configured input changes state relative to its register value |
| Reset Behavior | Hardware RESET pin resets only I²C state machine; I/O register contents persist - prevents unintended signal toggling during bus recovery |
| ESD Rating | 2000 V HBM, 1000 V CDM - meets industrial handling requirements |
Pinout & Package
HVQFN24 package (SOT616-1), 4 × 4 × 0.85 mm body with exposed thermal pad; requires soldering of VSS pin and center pad to PCB ground for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INT (22) | Interrupt output | Open-drain signal indicating change in any input port state - must be pulled up externally |
| A1 (23), A0 (18) | I²C address inputs | Set two LSBs of 7-bit slave address (11101xx); enable up to four PCA9539R devices on same bus |
| RESET (24) | Active-low reset input | Resets I²C state machine only; preserves I/O configuration and output data - no glitch on I/O lines |
| IO0_0–IO0_7 (1–8) | Port 0 I/O pins | Eight bidirectional pins controlled by Configuration Port 0 (Reg 6) and Output/Input Port 0 (Regs 2/0) |
| IO1_0–IO1_7 (10–17) | Port 1 I/O pins | Eight bidirectional pins controlled by Configuration Port 1 (Reg 7) and Output/Input Port 1 (Regs 3/1) |
| VDD (21), VSS (9) | Power supply | VDD powers core logic and I/O drivers; VSS is primary ground reference - both required for operation |
| SCL (19), SDA (20) | I²C interface | Serial clock and open-drain data lines - require external pull-ups per I²C specification |
Key Features
| Feature | Design Value |
|---|---|
| State-retentive hardware reset | RESET pin restores I²C communication without altering I/O configuration or output levels - critical for fail-safe systems |
| Per-port polarity inversion | Two 8-bit registers (Regs 4–5) invert read data polarity per pin - simplifies software handling of active-low sensors/switches |
| Noise-filtered I²C inputs | SCL/SDA inputs include digital noise filters - suppresses glitches from EMI or crosstalk in noisy industrial environments |
| Glitch-free power-up | Internal power-on reset ensures all registers initialize to known defaults before I²C access - eliminates undefined startup behavior |
| Configurable I/O direction | Independent 8-bit configuration registers (Regs 6–7) allow mixed input/output assignment per port - supports heterogeneous peripheral interfaces |
Applications
| Industrial Sensor Hub | Embedded Control Panel |
|---|---|
Use Scenario: Aggregating temperature, humidity, and motion sensor signals in a DIN-rail mounted PLC module. IC Role / Device Role / Timing Role: GPIO expander providing isolated, interrupt-driven input sampling for 16 discrete sensors. Use Value: Reduces host MCU GPIO usage; INT pin triggers only on actual sensor state change - cuts polling overhead and system wakeups. | Use Scenario: Driving LED status indicators and reading membrane keypad inputs in a medical device front panel. IC Role / Device Role / Timing Role: Bidirectional I/O interface managing 8 LEDs and 8 keypad rows/columns with polarity inversion for active-low keys. Use Value: Eliminates external level shifters and pull-ups; 5 V tolerant I/Os interface directly with LED drivers while VDD = 3.3 V. |
| Automated Test Equipment | Smart Building Controller |
Use Scenario: Controlling relay banks and monitoring limit switches in benchtop functional testers. IC Role / Device Role / Timing Role: High-reliability I/O expansion with latch-up immunity (>100 mA) and robust ESD protection (2000 V HBM). Use Value: Withstands repeated hot-plug events and contact discharge during test fixture reconfiguration - reduces field failure rate. | Use Scenario: Monitoring door/window contacts and controlling HVAC zone actuators in a BACnet edge controller. IC Role / Device Role / Timing Role: Low-quiescent-current I/O node interfacing with 24 V dry-contact sensors and 12 V solenoid drivers. Use Value: 2.3 V minimum VDD enables operation from backup supercapacitor during mains outage - maintains security monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar GPIO expander applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9539BS,118 | Identical pinout and register map, but RESET pin resets both state machine and all registers - causes I/O reinitialization | Less suitable where persistent I/O state is required during bus recovery (e.g., safety-critical outputs) | Select PCA9539RBS,118 when I/O state retention during I²C reset is mandatory |
| TCA9539PWR | TI part in TSSOP-24; includes internal 100 kΩ pull-ups on I/Os (absent in PCA9539R); identical RESET behavior | Higher standby current due to pull-ups; not drop-in - requires layout review for pull-up removal if low-power operation needed | Choose PCA9539RBS,118 for lower static current and guaranteed NXP qualification in industrial temp range (−40 °C to +85 °C) |
Compared with PCA9539BS,118, the PCA9539RBS,118 avoids disruptive I/O reinitialization on reset; versus TCA9539PWR, it eliminates leakage-induced current draw from internal pull-ups - delivering superior power efficiency in battery-backed or energy-harvested nodes.
Availability
PCA9539RBS,118 is available at Aetrix Electronics and suitable for industrial sensor hubs, embedded control panels, automated test equipment, and smart building controllers requiring stable component supply across extended temperature ranges.
Supply support for PCA9539RBS,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The PCA9539R series belongs to NXP's I²C-bus I/O expander product line, designed specifically for low-power, interrupt-driven peripheral expansion in resource-constrained embedded systems.
FAQ
What is the key functional difference between PCA9539RBS,118 and PCA9539BS,118?
The PCA9539RBS,118 features a state-retentive RESET: only the I²C-bus state machine resets, preserving I/O configuration and output register values. In contrast, PCA9539BS,118 performs a full register and state machine reset - causing all I/Os to revert to their default high-impedance input state. This makes PCA9539RBS,118 essential where maintaining output levels during bus recovery is critical.
Does PCA9539RBS,118 support 3.3 V microcontrollers interfacing with 5 V peripherals?
Yes. PCA9539RBS,118 has 5 V tolerant I/Os and operates from 2.3 V to 5.5 V. When powered at 3.3 V, its I/O pins safely accept 5 V input signals and drive 5 V loads - eliminating level-shifting components in mixed-voltage systems. The SCL/SDA lines also tolerate 5 V with appropriate pull-ups.
How does the interrupt (INT) pin behave on PCA9539RBS,118?
The INT pin is an active-low open-drain output that asserts when any input-configured I/O pin changes state relative to its corresponding input port register value. Reading the relevant input port register clears the interrupt. INT remains asserted until cleared - enabling reliable edge detection without polling in interrupt-driven firmware.
Can PCA9539RBS,118 be used in battery-powered applications?
Yes. PCA9539RBS,118 draws ultra-low standby current due to the absence of internal I/O pull-up resistors (unlike PCA9555). Combined with noise-filtered I²C inputs and glitch-free power-up, it minimizes system-level power consumption - making it suitable for coin-cell or energy-harvesting designs where quiescent current and deterministic startup are critical.
What package and thermal considerations apply to PCA9539RBS,118?
PCA9539RBS,118 uses the HVQFN24 (SOT616-1) package: 4 × 4 × 0.85 mm with an exposed thermal pad. Both the VSS pin (pin 9) and the center pad must be soldered to PCB ground. Thermal vias under the pad are required for effective heat dissipation and long-term reliability in continuous operation.
PCA9539RBS,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of I/O:
- 16
- Interface:
- I2C, SMBus
- Interrupt Output:
- Yes
- Features:
- POR
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-HVQFN (4x4)
PCA9539RBS,118 FAQ
1.How can I place an order for PCA9539RBS,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9539RBS,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PCA9539RBS,118 reliable?
The price and inventory of PCA9539RBS,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9539RBS,118 is usually 5 days.
3.What payment methods are accepted for PCA9539RBS,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9539RBS,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9539RBS,118?
PCA9539RBS,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9539RBS,118 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PCA9539RBS,118?
For technical support, including PCA9539RBS,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9539RBS,118 requirements.
6.How does Aetrix verify that PCA9539RBS,118 is sourced from the original manufacturer or authorized distributors?
All PCA9539RBS,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PCA9539RBS,118 meets industry standards.
7.What is the process for return or replacement of PCA9539RBS,118?
All PCA9539RBS,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9539RBS,118, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PCA9539RBS,118 part is unused and in its original packaging.
Return procedure for PCA9539RBS,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9539RBS,118 Tags
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TCA6408ARSVR
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TCA9535RTWR
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FXL6408UMX
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PCF8574ADWR
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TCA9554PWR
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TCA9554APWR
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TCA9534PWR
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TCA9555RTWR
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TCA9535PWR
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