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NXP Semiconductors PCA9675BQ,118
- Part No.:
- PCA9675BQ,118
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
PCA9675BQ,118.pdf
- Description:
- IC XPNDR 1MHZ I2C 24DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,610
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Product details
Overview
PCA9675BQ,118 from NXP Semiconductors is a 16-bit remote I/O expander for Fast-mode Plus (Fm+) I²C-bus, providing quasi-bidirectional I/O ports with 25 mA sink per pin, 400 mA total package sink capacity, and 1 MHz I²C-bus operation - enabling LED PWM dimming and high-density bus deployment in industrial control and display systems.
For engineers reviewing the PCA9675BQ,118 datasheet, PCA9675BQ,118 pinout, PCA9675BQ,118 application, or PCA9675BQ,118 equivalent, key selection criteria include its DHVQFN24 thermal-enhanced package, active-low open-drain interrupt (INT), 64 programmable slave addresses, and 2.3 V–5.5 V supply range with 5.5 V-tolerant I/Os - critical for scalable I/O expansion in space-constrained embedded designs.
Technical Context
The PCA9675BQ,118 implements a latch-based quasi-bidirectional I/O architecture where all 16 pins (P00–P07, P10–P17) default to HIGH inputs at power-up and support independent directionless read/write via I²C-bus register mapping. Its internal Power-On Reset (POR) and software reset (via General Call address 00h + data 06h) ensure deterministic initialization without external circuitry.
It integrates dedicated interrupt logic triggered by any input edge on I/O pins, with INT deactivation synchronized to I²C write/read pulse edges. The device supports full Fm+ compliance (1 MHz), 30 mA SDA sink drive for 4000 pF buses, and device ID readout (24-bit manufacturer/part/revision) using reserved Device ID address (F4h).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C-bus Speed | 1 MHz Fast-mode Plus - enables faster LED dimming updates and reduces bus arbitration latency vs. 400 kHz standard mode. |
| Supply Voltage Range | 2.3 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers without level shifters. |
| I/O Sink Current | 25 mA per pin - allows direct driving of standard LEDs without external drivers. |
| Total Package Sink | 400 mA - permits simultaneous illumination of up to 16 × 25 mA LEDs, eliminating need for supplemental current sinks. |
| Slave Addresses | 64 programmable options (via AD0–AD2) - avoids address conflicts in multi-device I²C networks (e.g., server backplanes). |
| Interrupt Output | Active-low open-drain INT - simplifies connection to MCU interrupt inputs with single pull-up resistor. |
| ESD Protection | 2000 V HBM / 1000 V CDM - ensures robustness during handling and board assembly in industrial environments. |
Pinout & Package
DHVQFN24 package (SOT815-1): 3.5 mm × 5.5 mm × 0.85 mm body, no leads, 24-terminal thermal-enhanced quad flat design with exposed center pad tied to VSS for improved thermal dissipation and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (P00) | Quasi-bidirectional I/O port 0, bit 0 | Configurable as input or output; defaults HIGH at power-up; 25 mA sink capable. |
| 2 (P01) | Quasi-bidirectional I/O port 0, bit 1 | Same electrical behavior as P00; supports latched output state retention. |
| 3 (P02) | Quasi-bidirectional I/O port 0, bit 2 | Directly drives LEDs or logic loads; no direction control pin required. |
| 4 (P03) | Quasi-bidirectional I/O port 0, bit 3 | Compatible with 5.5 V-tolerant signaling across full VDD range. |
| 5 (P04) | Quasi-bidirectional I/O port 0, bit 4 | Supports fast edge rates via internal 100 µA pull-up (Itrt(pu)) for loaded buses. |
| 6 (P05) | Quasi-bidirectional I/O port 0, bit 5 | Retains state during I²C communication; interrupt-triggered on input transitions. |
| 7 (P06) | Quasi-bidirectional I/O port 0, bit 6 | Valid for use in both input monitoring and output control roles within same system cycle. |
| 8 (P07) | Quasi-bidirectional I/O port 0, bit 7 | First byte of I²C write/read transfers maps to P07–P00 (MSB-to-LSB order). |
| 9 (VSS) | Supply ground | Must be connected to PCB ground plane; exposed center pad soldered for thermal performance. |
| 10 (P10) | Quasi-bidirectional I/O port 1, bit 0 | Second byte of I²C transfers maps to P17–P10; identical sink/source capability as Port 0. |
| 11 (P11) | Quasi-bidirectional I/O port 1, bit 1 | Independent operation from Port 0; no cross-port dependency in register access. |
| 12 (P12) | Quasi-bidirectional I/O port 1, bit 2 | Enables 16-bit parallel I/O expansion without external glue logic or multiplexing. |
| 13 (P13) | Quasi-bidirectional I/O port 1, bit 3 | Supports mixed input/output configurations per port (e.g., P10–P13 as inputs, P14–P17 as outputs). |
| 14 (P14) | Quasi-bidirectional I/O port 1, bit 4 | Valid for real-time status monitoring (e.g., switch inputs) and actuator control (e.g., relay drivers). |
| 15 (P15) | Quasi-bidirectional I/O port 1, bit 5 | Interrupt generation occurs on any edge change - eliminates polling overhead in MCU firmware. |
| 16 (P16) | Quasi-bidirectional I/O port 1, bit 6 | High-current sink enables direct connection to common-cathode LED arrays. |
| 17 (P17) | Quasi-bidirectional I/O port 1, bit 7 | Last bit of second I²C data byte; completes full 16-bit port mapping. |
| 18 (AD0) | Address input 0 | Configures LSB of 7-bit slave address; tied HIGH/LOW to select among 64 possible addresses. |
| 19 (SCL) | Serial clock line input | Accepts 1 MHz Fm+ clock; internal filtering rejects noise outside valid timing windows. |
| 20 (SDA) | Serial data line I/O | 30 mA sink capability supports long traces and multiple devices without bus buffers. |
| 21 (VDD) | Supply voltage | 2.3–5.5 V operation; powers internal logic, I/O drivers, and interrupt circuitry. |
| 22 (INT) | Interrupt output | Open-drain, active-low signal asserted on any I/O edge; requires external pull-up to VDD or host rail. |
| 23 (AD1) | Address input 1 | Mid-bit of address configuration; enables unique addressing in multi-PCA9675BQ,118 systems. |
| 24 (AD2) | Address input 2 | MSB of address configuration; combined with AD0–AD1, defines full 64-address space. |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit quasi-bidirectional I/O | Eliminates need for separate direction-control signals or external transceivers in I/O expansion designs. |
| 1 MHz Fast-mode Plus I²C interface | Reduces I/O update latency by 2.5× vs. standard 400 kHz I²C, critical for responsive LED dimming control. |
| 400 mA total package sink capacity | Supports full 16-pin LED array drive without external current sinks or heat-spreading components. |
| 64 programmable slave addresses | Enables up to 64 PCA9675BQ,118 devices on one I²C bus - ideal for modular rack-mounted equipment. |
| Readable device ID (24-bit) | Allows runtime identification of manufacturer, part number, and die revision - essential for field firmware validation. |
| Power-On Reset + software reset | Ensures known initial state after power cycling or remote recovery without hardware reset lines. |
Applications
| LED Signage & Displays | Servers & Data Center Hardware |
|---|---|
|
Use Scenario: Driving 16-channel LED matrix in outdoor signage with brightness modulation. IC Role / Device Role / Timing Role: Remote I/O expander providing direct 25 mA sink per LED segment and synchronized PWM dimming via 1 MHz I²C updates. Use Value: Eliminates discrete transistor arrays and reduces BOM count while supporting high-refresh-rate visual output. |
Use Scenario: Monitoring hot-swap status, fan tachometers, and PSU health signals in 1U server chassis. IC Role / Device Role / Timing Role: Quasi-bidirectional port handling mixed input (switches/sensors) and output (LED indicators) with interrupt-driven event reporting. Use Value: Reduces host CPU polling load and enables immediate response to hardware faults via INT line assertion. |
| Industrial PLC I/O Modules | Test & Measurement Equipment |
|
Use Scenario: Adding isolated digital I/O points to compact PLC base units with limited PCB area. IC Role / Device Role / Timing Role: Compact DHVQFN24 I/O expander delivering 16 configurable channels with 5.5 V-tolerant inputs for 24 V industrial logic levels. Use Value: Enables high-density I/O expansion in thermally constrained enclosures without external level shifters. |
Use Scenario: Controlling front-panel buttons, rotary encoders, and status LEDs in benchtop oscilloscopes and signal generators. IC Role / Device Role / Timing Role: Low-standby-current I/O hub managing human-interface signals and visual feedback with minimal power impact. Use Value: Supports battery-backed operation and extends runtime in portable test instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote I/O expander applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9674BQ,118 | 8-bit I/O (vs. 16-bit); identical DHVQFN24 package, 1 MHz I²C, and 25 mA sink per pin. | Lower channel count suits cost-sensitive or space-limited designs needing ≤8 I/Os. | Select when full 16-bit expansion is unnecessary and BOM cost reduction is prioritized. |
| TCA6424ARGJR | 16-bit, 3.3 V only (vs. 2.3–5.5 V), 1 MHz I²C, but lower 10 mA per-pin sink and 150 mA total package sink. | Limited LED drive capability; requires external drivers for >10 mA loads. | Choose for low-power 3.3 V systems where thermal budget prohibits 400 mA package dissipation. |
Compared with PCA9674BQ,118 and TCA6424ARGJR, the PCA9675BQ,118 uniquely delivers 16-bit I/O, 25 mA sink per pin, and 400 mA total sink in a thermally enhanced 3.5 × 5.5 mm package - making it optimal for high-density LED control and industrial I/O where voltage flexibility and drive strength are mandatory.
Availability
PCA9675BQ,118 is available at Aetrix Electronics and suitable for LED signage, industrial PLC modules, and server management subsystems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for PCA9675BQ,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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in I²C-bus peripherals and embedded interface ICs.
The PCA9675BQ,118 belongs to NXP's Fast-mode Plus I²C I/O expander product line, designed specifically to replace legacy PCF8575 devices with higher speed, greater drive strength, and expanded addressing - targeting high-reliability industrial and infrastructure systems.
FAQ
What is the maximum I²C-bus speed supported by the PCA9675BQ,118?
The PCA9675BQ,118 supports Fast-mode Plus (Fm+) I²C-bus operation up to 1 MHz - a 2.5× improvement over standard Fast-mode (400 kHz). This higher speed enables faster LED dimming updates and reduced latency in multi-device I²C networks, directly benefiting real-time control applications such as signage and industrial automation where PCA9675BQ,118 is deployed.
How does the interrupt (INT) pin function on the PCA9675BQ,118?
The PCA9675BQ,118 features an active-low open-drain INT pin that asserts whenever any rising or falling edge occurs on its 16 quasi-bidirectional I/O pins. The interrupt is automatically cleared upon reading the port registers or writing new values - eliminating the need for explicit deassertion commands. This behavior makes PCA9675BQ,118 ideal for event-driven architectures where MCU resources must be conserved.
Can the PCA9675BQ,118 directly drive standard LEDs?
Yes, the PCA9675BQ,118 can directly drive standard LEDs with up to 25 mA sink current per I/O pin and a total package sink capacity of 400 mA. This allows simultaneous operation of all 16 outputs at full rated current - a capability confirmed in the official NXP datasheet and validated in LED signage reference designs using PCA9675BQ,118.
What package type is used for the PCA9675BQ,118?
The PCA9675BQ,118 uses the DHVQFN24 package (SOT815-1): a 3.5 mm × 5.5 mm × 0.85 mm thermal-enhanced quad flat no-lead package with an exposed center pad tied to VSS. This package provides superior thermal performance and board-level reliability compared to SO24 or TSSOP24 variants, making PCA9675BQ,118 suitable for high-density, thermally constrained industrial PCB layouts.
How many unique I²C slave addresses does the PCA9675BQ,118 support?
The PCA9675BQ,118 supports 64 unique I²C slave addresses, configured via three address pins (AD0, AD1, AD2). This expands scalability beyond legacy expanders like the PCF8575 (8 addresses), allowing up to 64 PCA9675BQ,118 devices on a single I²C bus - a key advantage in modular server backplanes and large-scale industrial control systems using PCA9675BQ,118.
PCA9675BQ,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
- Interrupt Output:
- Yes
- Features:
- POR
- Output Type:
- Push-Pull
- Current - Output Source/Sink:
- 100µA, 25mA
- Clock Frequency:
- 1 MHz
- Voltage - Supply:
- 2.3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-DHVQFN (5.5x3.5)
PCA9675BQ,118 FAQ
1.How can I place an order for PCA9675BQ,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9675BQ,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 PCA9675BQ,118 reliable?
The price and inventory of PCA9675BQ,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9675BQ,118 is usually 5 days.
3.What payment methods are accepted for PCA9675BQ,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9675BQ,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9675BQ,118?
PCA9675BQ,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9675BQ,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 PCA9675BQ,118?
For technical support, including PCA9675BQ,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9675BQ,118 requirements.
6.How does Aetrix verify that PCA9675BQ,118 is sourced from the original manufacturer or authorized distributors?
All PCA9675BQ,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 PCA9675BQ,118 meets industry standards.
7.What is the process for return or replacement of PCA9675BQ,118?
All PCA9675BQ,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9675BQ,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 PCA9675BQ,118 part is unused and in its original packaging.
Return procedure for PCA9675BQ,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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