PCA9539BS,118 NXP Integrated Circuit (Quad Flat No-Lead) In Stock
NXP PCA9539BS,118 is a 16-bit I2C I/O port expander with two 8-bit configurable ports and 400 kHz Fast-mode I2C interface in an HVQFN-24 package. It operates at 2.3 V to 5.5 V with active-low interrupt and reset lines for embedded GPIO expansion. Available from stock worldwide with fast shipping.
- Manufacturer
- NXP
- Package
- Quad Flat No-Lead
- Pin Count
- 24
- Lifecycle
- OBSOLETE
- Datasheet
- PCA9539BS,118 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 16 bidirectional I/O pins in two independent 8-bit ports expand microcontroller GPIO over a 400 kHz I2C bus with minimal wiring
- Active-low interrupt output notifies the host CPU of any I/O state change without continuous polling, reducing processing overhead
- HVQFN-24 package with 2.3 V to 5.5 V operating range suits compact industrial, consumer, and IoT PCB designs requiring scalable I/O expansion
Applications
The PCA9539BS,118 is used to expand microcontroller GPIO in industrial control panels, HMI boards, robotics modules, and IoT gateways where native pin count is insufficient. Its 16-bit bidirectional port structure over a 400 kHz I2C bus makes it straightforward to add button matrices, relay banks, LED arrays, or sensor flag inputs with minimal firmware overhead. Support for up to 8 devices on a single I2C bus allows systems to scale to 128 additional inputs and outputs without changing bus wiring.
Specifications
| Manufacturer Package Code | SOT616-1 |
| YTEOL | 0 |
| Clock Frequency-Max | 0.4MHz |
| JESD-30 Code | S-PQCC-N24 |
| JESD-609 Code | e4 |
| Number of Bits | 16 |
| Number of I/O Lines | 16 |
| Number of Ports | 2 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | LCC24,.16SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max | 160mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 2.3V |
| Supply Voltage-Nom | 3V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| uPs/uCs/Peripheral ICs Type | PARALLEL IO PORT, GENERAL PURPOSE |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.31.00.01 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What I/O capacity and I2C speed does the PCA9539BS,118 provide for GPIO expansion?
The PCA9539BS,118 offers 16 inputs and outputs organized as two 8-bit configurable ports, all accessible over an I2C bus operating at up to 400 kHz in Fast mode. It accepts a 2.3 V to 5.5 V supply and includes hardware address pins to differentiate up to 8 devices on the same bus, scaling total GPIO expansion to 128 pins per bus.
How does the interrupt output of the PCA9539BS,118 reduce CPU load in real-time embedded designs?
The active-low interrupt output on the PCA9539BS,118 triggers the host microcontroller immediately when any of the 16 inputs or outputs change state, eliminating polling over the 400 kHz I2C bus. This event-driven architecture benefits button arrays, limit switches, and relay feedback circuits where rapid response to state changes must not impact the main application loop.
How many PCA9539BS,118 devices can be used on one I2C bus and what addresses are available?
Up to 8 PCA9539BS,118 devices can share a single 400 kHz I2C bus using 3 hardware address input pins, yielding up to 128 inputs and outputs on that bus. Each device is individually addressable and operates from 2.3 V to 5.5 V, making multi-device configurations straightforward for industrial panel controllers, display driver boards, and embedded HMI systems.
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