Orderable parts
| Type number | Orderable part number | Ordering code (12NC) | Package | Buy from distributors |
|---|---|---|---|---|
| NCA9537DP | NCA9537DPJ | 935692369118 | SOT552-1 | Order product |
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Click here for more informationNCA9537DP
4-bit I²C and SMBus low-power I/O expander with interrupt, reset, and configurable registers
The NCA9537-Q100 is a 4-bit bidirectional I/O expander compliant with I²C and SMBus protocols, operating over a wide supply range of 1.65 V to 5.5 V. It enables remote GPIO expansion for microcontroller-based systems via a standard two- wire interface (SCL/SDA), supporting clock frequencies up to 1 MHz (Fast-Mode Plus).
Part of Nexperia’s advanced I²C-bus expander portfolio, the device is optimized for space-constrained applications requiring additional I/O such as LED control, button interfacing, sensor integration, status indication, and signal routing. Its compact form factor and low-power operation make it well-suited for consumer, industrial, and IoT designs.
The NCA9537-Q100 provides 4 bits in Configuration Register defining each I/O as input or output, 4 bits in Input Port Register capturing the logic state of input pins, 4 bits in Output Port Register controlling the output logic levels and 4 bits in Polarity Inversion Register allowing inversion of input logic (active HIGH or LOW).
The system controller configures the I/Os via the Configuration Register, accesses real-time data through the Input Port Register, and controls the outputs through the Output Port Registers. The Polarity Inversion Register allows flexible logic interpretation. All registers are accessible via the I²C interface.
The NCA9537-Q100 supports I²C General Call address (0x00), which upon receiving a specific reset command (0x06), to initiate a software-triggered reset. This is ideal for systems lacking hardware reset or requiring simultaneous reset of multiple devices.
The NCA9537-Q100 has an open-drain interrupt output (INT) which is activated when any one of the GPIO changes from its corresponding input port register state, enabling efficient real-time input monitoring for applications like button interfaces or sensor events. To recover from errors like I²C time-outs, a system controller can drive the RESET input low. This resets all registers to their default state and reinitializes the I²C/SMBus interface without requiring a power cycle.
Upon power-on reset, all registers are initialized to default states, and the internal state machine is set. The device features a fixed I²C-bus address, supporting single-device operation per bus.
Features
4-bit I²C-bus GPIO
Operating power supply voltage range of 1.65 V to 5.5 V
5 V tolerant I/Os
Input and Output Configuration register
Polarity Inversion register
Software reset by General Call
Dedicated Interrupt Output
Active LOW reset input (RESET) for external reset control
Low standby current
Noise filter on SCL/SDA inputs
No glitch on power-up
Internal power-on reset
0 Hz to 1 MHz clock frequency Fast-mode Plus I²C-bus
ESD protection:
HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V
CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V
Latch-up performance exceeds 100 mA per JESD 78B Class II
Packages offered: SOT552-1 (TSSOP10)
Specified from -40 °C to +85 °C and from -40 °C to +125 °C
Parametrics
| Type number | VCC (V) | Logic switching levels | Power dissipation considerations | Tamb (°C) | Package name |
|---|---|---|---|---|---|
| NCA9537DP | 1.65 - 5.5 | CMOS | low | -40~85 | TSSOP10 |
Package
| Type number | Orderable part number, (Ordering code (12NC)) | Status | Marking | Package | Package information | Reflow-/Wave soldering | Packing |
|---|---|---|---|---|---|---|---|
| NCA9537DP | NCA9537DPJ (935692369118) |
Samples available / Development | A9537 |
TSSOP10 (SOT552-1) |
SOT552-1 |
SSOP-TSSOP-VSO-WAVE
|
SOT552-1_118 |
Environmental information
| Type number | Orderable part number | Chemical content | RoHS | RHF-indicator |
|---|---|---|---|---|
| NCA9537DP | NCA9537DPJ | NCA9537DP |
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Documentation (10)
| File name | Title | Type | Date |
|---|---|---|---|
| NCA9537 | 4-bit I²C and SMBus low-power I/O expander with interrupt, reset, and configurable registers | Data sheet | 2026-03-04 |
| AN90063 | Questions about package outline drawings | Application note | 2025-10-22 |
| Nexperia_document_guide_MiniLogic_PicoGate_201901 | PicoGate leaded logic portfolio guide | Brochure | 2019-01-07 |
| SOT552-1 | 3D model for products with SOT552-1 package | Design support | 2020-01-22 |
| nca9537 | NCA9537 IBIS model | IBIS model | 2026-03-07 |
| Nexperia_package_poster | Nexperia package poster | Leaflet | 2020-05-15 |
| TSSOP10_SOT552_mk | plastic, thin shrink small outline package; 10 leads; 0.5 mm pitch; 3 mm x 3 mm x 1.1 mm body | Marcom graphics | 2017-01-28 |
| SOT552-1 | plastic, thin shrink small outline package; 10 leads; 0.5 mm pitch; 3 mm x 3 mm x 1.1 mm body | Package information | 2025-03-19 |
| SOT552-1_118 | TSSOP10; Reel pack for SMD, 13''; Q1/T1 product orientation | Packing information | 2020-04-21 |
| SSOP-TSSOP-VSO-WAVE | Footprint for wave soldering | Wave soldering | 2009-10-08 |
Support
Please contact us if you have any questions. If you are in need of design support, please fill in the technical support form, we will get back to you shortly.
Please visit our engineer exchange forum or contact us for further support.
Longevity
The Nexperia Longevity Program is aimed to provide our customers information from time to time about the expected time that our products can be ordered. The NLP is reviewed and updated regularly by our Executive Management Team. View our longevity program here.
Ordering, pricing & availability
| Type number | Orderable part number | Ordering code (12NC) | Status | Packing | Packing Quantity | Buy online |
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Sample
As a Nexperia customer you can order samples via our sales organization.
If you do not have a direct account with Nexperia our network of global and regional distributors is available and equipped to support you with Nexperia samples. Check out the list of official distributors.
How does it work?
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.