Low-voltage 16-bit I²C and SMBus low-power I/O expander with interrupt output, reset pin and configuration registers

The NCA9539 provides 16 bits of General Purpose Input/Output (GPIO) expansion with interrupt and reset for I²C-bus/SMBus applications. It is designed for a wide voltage range of 1.65 V to 5.5 V. Nexperia GPIO expanders provide an elegant solution when additional IOs are needed while keeping the interconnections to a minimum, for example, in ACPI power switches, sensors, push buttons, LEDs and fan control. The NCA9539 contains a set of 8 bit input, output, configuration and polarity inversion registers. At power up all IOs default to inputs. Each IO can be configured as either input or output by changing the corresponding bit in the configuration register. The data for each input or output is stored in the corresponding input or output register. The polarity inversion register can be programmed to invert the polarity of the read register. The NCA9539 has an open-drain interrupt output which is activated when any one of the GPIO changes from its corresponding input port register state. INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I²C-bus. Thus, NCA9539 can remain a simple slave. The power on reset sets the registers to default values and initializes the device state machine. The RESET pin can be used to achieve same reset functionality without power down/up cycling by keeping active low. The state machine and the registers are in their default state until the RESET input is once again HIGH. This input requires pull up to VCC. The NCA9539 has two address pins A0 and A1 which can be used to configure the I²C bus slave address of the device. It allows up-to four devices to share the same I²C-bus/SMBus.

Features and benefits

  • I²C-bus to parallel port expander

  • Operating power supply voltage range of 1.65 V to 5.5 V

  • Low standby current consumption:

    • 2.5 µA (maximum)

  • Schmitt-trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs

    • Vhys = 0.10 × VCC (typical)

    • Noise filter on SCL and SDA inputs

  • 5 V tolerant I/Os

  • 16 I/O pins which power up configured in input state
  • Open-drain active LOW interrupt output (INT)

  • Reset input for resetting NCA9539 to default values (RESET)

  • 400 kHz Fast-mode I²C-bus

  • Internal power-on reset

  • No glitch on power-up

  • Latched outputs with 25 mA drive maximum capability for directly driving LEDs

  • Latch-up performance exceeds 100 mA per JESD78, Class II

  • ESD protection:

    • HBM ANSI/ESDA/JEDEC JS-001 Class 2 exceeds 2000 V

    • CDM ANSI/ESDA/JEDEC JS-002 Class C3 exceeds 1000 V

  • Packages offered: TSSOP24 and HWQFN24

  • Specified from -40 °C to +85 °C


型号 Product status VCC (V) Logic switching levels Power dissipation considerations Tamb (°C) Package name
NCA9539PW Production 1.65 - 5.5 CMOS low -40~85 TSSOP24


型号 可订购的器件编号,(订购码(12NC)) 状态 标示 封装 外形图 回流焊/波峰焊 包装
Active NCA9539PW SOT355-1


型号 可订购的器件编号 化学成分 RoHS RHF指示符
NCA9539PW NCA9539PWJ NCA9539PW rohs rhf rhf

文档 (14)

文件名称 标题 类型 日期
NCA9539 Low-voltage 16-bit I²C and SMBus low-power I/O expander with interrupt output, reset pin and configuration registers Data sheet 2023-10-18
AN90044 A study of I2C with examples Application note 2023-07-03
SOT355-1 3D model for products with SOT355-1 package Design support 2020-01-22
nca9539 NCA9539 IBIS model IBIS model 2023-04-07
Nexperia_document_leaflet_I2C_GPIO_expanders I2C GPIO Expanders 2023 Leaflet 2023-04-26
Nexperia_package_poster Nexperia package poster Leaflet 2020-05-15
SOT355-1 plastic, thin shrink small outline package; 24 leads; 0.65 mm pitch; 7.8 mm x 4.4 mm x 1.1 mm body Package information 2022-06-22
SOT355-1_118 TSSOP24; Reel pack for SMD 13''; Q1/T1 product orientation Packing information 2020-04-21
NCA9539PW_Nexperia_Product_Reliability NCA9539PW Nexperia Product Reliability Quality document 2023-05-29
NCA95XX_Arduino_Sketches NCA95XX Arduino™ Sketch Examples Software 2023-03-12
NCA95XX_EVB_Software NCA95XX EVB GUI Software 2023-03-12
UM90016 NCA95xx GPIO expander EVB (Arduino™ shield compatible) User manual 2024-02-23
UM90017 NCA95XX Evaluation Board: Quick-Start Guide User manual 2023-01-18
SSOP-TSSOP-VSO-WAVE Footprint for wave soldering Wave soldering 2009-10-08


如果您需要设计/技术支持,请告知我们并填写 应答表 我们会尽快回复您。


文件名称 标题 类型 日期
nca9539 NCA9539 IBIS model IBIS model 2023-04-07
SOT355-1 3D model for products with SOT355-1 package Design support 2020-01-22


型号 Orderable part number Ordering code (12NC) 状态 包装 Packing Quantity 在线购买
NCA9539PW NCA9539PWJ 935691402118 Active SOT355-1_118 2,500 订单产品


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The interactive datasheets are based on the Nexperia MOSFET precision electrothermal models. With our interactive datasheets you can simply specify your own conditions interactively. Start by changing the values of the conditions. You can do this by using the sliders in the condition fields. By dragging the sliders you will see how the MOSFET will perform at the new conditions set.


型号 可订购的器件编号 订购代码(12NC) 封装 从经销商处购买
NCA9539PW NCA9539PWJ 935691402118 SOT355-1 订单产品