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NXP Semiconductors PCA9539PW/Q900,118
- Part No.:
- PCA9539PW/Q900,118
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCA9539PW/Q900,118.pdf
- Description:
- IC XPND 400KHZ I2C SMBUS 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,909
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Product details
Overview
PCA9539PW/Q900,118 from NXP Semiconductors is a 24-pin TSSOP I²C/SMBus 16-bit GPIO expander with active-low interrupt and reset, 5 V tolerant I/Os, and operation from 3.0 V to 5.5 V. It provides parallel input/output expansion for microcontroller systems requiring additional digital control lines in automotive body electronics and industrial sensor interfaces.
For engineers reviewing the PCA9539PW/Q900,118 datasheet, PCA9539PW/Q900,118 pinout, PCA9539PW/Q900,118 application, or PCA9539PW/Q900,118 equivalent, key selection criteria include its AEC-Q100 qualification (−40 °C to +125 °C), absence of internal pull-ups (enabling ultra-low standby current), and dedicated RESET pin that fully resets registers and state machine - distinguishing it from the PCA9539R variant.
Technical Context
The PCA9539PW/Q900,118 implements two independent 8-bit I/O ports (Port 0 and Port 1), each with configurable direction (input/output), polarity inversion, and input register read-back. Its interrupt output activates on input state change and clears only upon reading the corresponding port register - not cross-port reads.
It uses standard I²C addressing with hardware-selectable A0/A1 pins (four possible addresses: 0x74–0x77), supports up to 400 kHz clock frequency, and includes noise filtering on SCL/SDA inputs. The RESET pin is active-low and causes full device initialization including configuration and output registers - unlike the PCA9539R, where RESET leaves I/O register states intact.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I/O Count | 16-bit bidirectional GPIO (8-bit Port 0 + 8-bit Port 1) |
| Supply Voltage | 3.0 V to 5.5 V - enables direct interface with 3.3 V and 5 V controllers without level shifters |
| I/O Voltage Tolerance | 5 V tolerant - allows safe connection to 5 V peripherals even when VDD = 3.3 V |
| Interrupt Output | Open-drain, active-low - requires external pull-up; asserts when any configured input changes state |
| Reset Function | Active-low RESET pin fully resets all registers and I²C state machine - ensures deterministic startup |
| Operating Temperature | −40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for automotive under-hood applications |
| I²C Speed | 0 Hz to 400 kHz - compatible with standard-mode and fast-mode I²C buses |
Pinout & Package
PCA9539PW/Q900,118 is housed in a 24-lead TSSOP package (SOT355-1), 4.4 mm body width, with pin 1 located in quadrant Q1 per reel tape standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INT (Pin 1) | Interrupt output | Open-drain signal indicating input state change; requires external pull-up to VDD |
| A1 (Pin 2) | Address input | LSB of hardware I²C address (0x74–0x77); tied HIGH/LOW to select one of four devices on same bus |
| RESET (Pin 3) | Reset input | Active-low; forces full register and state machine reset - restores default configuration (all I/Os as inputs) |
| IO0_0 to IO0_7 (Pins 4–11) | Port 0 I/O | Eight bidirectional pins; direction set by Configuration Port 0 register; default to high-impedance inputs at power-on |
| VSS (Pin 12) | Ground | Primary supply return; must be connected to system ground plane |
| IO1_0 to IO1_7 (Pins 13–20) | Port 1 I/O | Eight bidirectional pins; functionally identical to Port 0; defaults to inputs at reset |
| A0 (Pin 21) | Address input | MSB of hardware I²C address; used with A1 to configure device address |
| SCL (Pin 22) | I²C clock | Input-only clock line; includes internal noise filter for robust operation in noisy environments |
| SDA (Pin 23) | I²C data | Open-drain bidirectional data line; requires external pull-up; includes internal noise filter |
| VDD (Pin 24) | Supply voltage | 3.0 V to 5.5 V power input; powers internal logic and I/O buffers |
Key Features
| Feature | Design Value |
|---|---|
| Zero internal I/O pull-up resistors | Eliminates static current draw when I/Os are held LOW - critical for battery-powered systems |
| Dedicated hardware RESET | Full register and state machine reset without power cycle - enables reliable recovery from I²C bus lockup |
| Independent port interrupt clearing | Reading Port 0 register clears only Port 0 interrupts - prevents unintended masking of Port 1 events |
| Polarity inversion per port | Permits active-HIGH or active-LOW interpretation of input signals without external inverters |
| ESD protection | ≥2000 V HBM and ≥1000 V CDM - enhances reliability in handling and assembly environments |
Applications
| Automotive Body Control Module | Industrial Sensor Hub |
|---|---|
Use Scenario: Monitoring door latch switches, seat position sensors, and mirror control buttons in a vehicle cabin. IC Role / Device Role / Timing Role: GPIO expander providing 16 isolated, 5 V tolerant digital inputs to an MCU over I²C - reducing MCU pin count and simplifying wiring harness design. Use Value: AEC-Q100 qualification ensures operation across −40 °C to +125 °C; active-low interrupt enables immediate MCU wake-up on switch actuation without polling. | Use Scenario: Aggregating status signals from temperature, humidity, and motion sensors in a factory-floor environmental monitor. IC Role / Device Role / Timing Role: Centralized I/O interface translating multiple sensor digital outputs into a single I²C stream for host processor ingestion. Use Value: Polarity inversion register allows uniform active-HIGH logic interpretation across mixed-sensor vendors; low standby current extends system uptime in battery-backed deployments. |
| Smart Appliance Keypad Interface | LED Status Panel Controller |
Use Scenario: Scanning a 10-digit numeric keypad and detecting button press/release in a washing machine control panel. IC Role / Device Role / Timing Role: Parallel-to-serial converter mapping mechanical key closures to I²C-readable register bits - offloading scanning logic from main MCU. Use Value: Interrupt-driven operation minimizes MCU polling overhead; 5 V tolerance accommodates legacy keypad designs using 5 V pull-ups. | Use Scenario: Driving 16 discrete LEDs for system status indication (power, fault, communication, mode) in network equipment. IC Role / Device Role / Timing Role: Constant-current sink driver (configured as outputs) with software-controllable on/off and blink timing via host MCU. Use Value: No internal pull-ups prevent unintended LED biasing; configurable output polarity simplifies PCB layout by enabling common-anode or common-cathode LED arrays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar GPIO expander applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9539PW,118 | Same silicon, non-AEC-Q100; rated for −40 °C to +85 °C only | Not suitable for under-hood or extended-temperature industrial use | Select PCA9539PW/Q900,118 for automotive or high-reliability thermal environments |
| PCA9539RPW/Q900,118 | RESET pin resets only I²C state machine - I/O register contents persist | Enables "graceful" I²C recovery without disrupting peripheral states (e.g., LED brightness, relay positions) | Choose PCA9539RPW/Q900,118 when maintaining I/O state during bus recovery is critical |
Compared with PCA9539PW,118 and PCA9539RPW/Q900,118, the PCA9539PW/Q900,118 uniquely combines AEC-Q100 qualification with full-register RESET functionality - making it optimal for safety-critical automotive subsystems requiring both temperature resilience and deterministic restart behavior.
Availability
PCA9539PW/Q900,118 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor hubs, smart appliance interfaces, and LED status panels requiring stable component supply across extended temperature ranges.
Supply support for PCA9539PW/Q900,118 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 PCA9539 product line delivers I²C-based GPIO expansion with integrated interrupt and reset functionality - designed specifically for resource-constrained microcontroller systems needing reliable, low-power digital I/O extension in harsh environments.
FAQ
What is the operating temperature range of the PCA9539PW/Q900,118?
The PCA9539PW/Q900,118 is AEC-Q100 qualified for operation from −40 °C to +125 °C. This extended range supports deployment in automotive engine compartments, industrial control cabinets, and outdoor equipment where ambient temperatures exceed standard commercial-grade limits. Its thermal performance is validated per Grade 1 requirements, ensuring reliability under sustained high-temperature stress.
How does the RESET pin on the PCA9539PW/Q900,118 differ from the PCA9539R variant?
The RESET pin on the PCA9539PW/Q900,118 performs a full device reset: it initializes all registers (configuration, output, polarity inversion) and the I²C state machine to their power-on defaults. In contrast, the PCA9539R's RESET pin only resets the I²C interface state machine - leaving I/O register contents unchanged. This makes the PCA9539PW/Q900,118 ideal for applications requiring guaranteed deterministic startup behavior.
Does the PCA9539PW/Q900,118 include internal pull-up resistors on its I/O pins?
No, the PCA9539PW/Q900,118 omits internal I/O pull-up resistors entirely - a key distinction from the PCA9555. This design eliminates static current draw when I/Os are held LOW, significantly reducing standby power consumption. External pull-ups must be added if required for specific interface logic levels or open-drain configurations.
Can the PCA9539PW/Q900,118 interface directly with 5 V peripherals while powered from a 3.3 V supply?
Yes, the PCA9539PW/Q900,118 features 5 V tolerant I/Os. When VDD = 3.3 V, its I/O pins safely accept input voltages up to 5.5 V and drive outputs compatible with 5 V logic thresholds. This eliminates the need for external level-shifting circuitry in mixed-voltage systems - simplifying design and reducing BOM cost.
How is the I²C address configured on the PCA9539PW/Q900,118?
The PCA9539PW/Q900,118 uses two hardware address pins - A0 and A1 - to configure its 7-bit I²C address. With both pins grounded, the base address is 0x74; tying A0 HIGH sets 0x75, A1 HIGH sets 0x76, and both HIGH sets 0x77. This allows up to four PCA9539PW/Q900,118 devices to share the same I²C bus without address conflict.
PCA9539PW/Q900,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
PCA9539PW/Q900,118 FAQ
1.How can I place an order for PCA9539PW/Q900,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9539PW/Q900,118 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 PCA9539PW/Q900,118 reliable?
The price and inventory of PCA9539PW/Q900,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9539PW/Q900,118 is usually 5 days.
3.What payment methods are accepted for PCA9539PW/Q900,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9539PW/Q900,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9539PW/Q900,118?
PCA9539PW/Q900,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9539PW/Q900,118 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 PCA9539PW/Q900,118?
For technical support, including PCA9539PW/Q900,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9539PW/Q900,118 requirements.
6.How does Aetrix verify that PCA9539PW/Q900,118 is sourced from the original manufacturer or authorized distributors?
All PCA9539PW/Q900,118 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 PCA9539PW/Q900,118 meets industry standards.
7.What is the process for return or replacement of PCA9539PW/Q900,118?
All PCA9539PW/Q900,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9539PW/Q900,118, 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 PCA9539PW/Q900,118 part is unused and in its original packaging.
Return procedure for PCA9539PW/Q900,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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