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NXP Semiconductors PCA9671D,118
- Part No.:
- PCA9671D,118
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PCA9671D,118.pdf
- Description:
- IC XPNDR 1MHZ I2C 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,644
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Product details
Overview
PCA9671D,118 from NXP Semiconductors is a 16-bit remote I/O expander for Fast-mode Plus (Fm+) I²C-bus systems, providing quasi-bidirectional I/O ports with 25 mA sink per pin, 400 mA total package sink capacity, and 1 MHz I²C-bus operation. It replaces the PCF8575 with higher drive strength, faster bus speed, and active-low RESET input instead of interrupt output-enabling direct LED PWM dimming and high-density bus configurations in industrial control and server management.
For engineers reviewing the PCA9671D,118 datasheet, PCA9671D,118 pinout, PCA9671D,118 application, or PCA9671D,118 equivalent, key selection criteria include its 1 MHz Fm+ I²C interface, 25 mA per-pin sink capability, 64 programmable slave addresses, and SO24 package compatibility with legacy PCF8575 layouts-critical for upgrading embedded I/O without redesigning address logic or power delivery.
Technical Context
The PCA9671D,118 implements a quasi-bidirectional I/O architecture where all 16 pins (P00–P07, P10–P17) default to HIGH at power-up and require no direction-control register. Its internal Power-On Reset (POR) and dedicated active-low RESET pin ensure deterministic initialization independent of I²C-bus state.
It supports full Fm+ compliance (1 MHz), 30 mA SDA sink for 4000 pF buses, and 2.3 V–5.5 V operation with 5.5 V-tolerant I/Os. Addressing uses three hardware pins (AD0–AD2) to select among 64 unique slave addresses, avoiding conflicts in multi-device systems without external address translation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C-bus Speed | 1 MHz Fast-mode Plus - enables real-time LED PWM dimming and reduces bus arbitration latency vs. 400 kHz alternatives. |
| Per-pin Sink Current | 25 mA - sufficient to directly drive standard LEDs without external transistors or current-limiting resistors. |
| Total Package Sink | 400 mA - supports simultaneous illumination of 16 × 25 mA LEDs, unlike PCF8575's 100 mA limit. |
| Supply Voltage Range | 2.3 V to 5.5 V with 5.5 V-tolerant I/Os - interoperable across mixed-voltage systems (e.g., 3.3 V MCU + 5 V peripherals). |
| Slave Addresses | 64 programmable via AD0/AD1/AD2 - eliminates address collisions in dense I/O expansion deployments (e.g., rack-mounted servers). |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial control, medical equipment, and telecom infrastructure environments. |
| ESD Protection | 2000 V HBM, 1000 V CDM - meets robustness requirements for handling during assembly and field service. |
Pinout & Package
PCA9671D,118 is supplied in SO24 (SOT137-1) package: plastic small outline, 24 leads, 7.5 mm body width. Pin 1 is RESET (active-low reset input); pins 4–11 and 13–20 are quasi-bidirectional I/Os (P00–P07, P10–P17); pins 21–24 are AD0, SCL, SDA, VDD; pins 12 and 9 are VSS (supply ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET (Pin 1) | Active-low hardware reset | Holds device in reset until released; overrides I²C commands and forces I/Os to high-impedance input state. |
| P00–P07, P10–P17 (Pins 4–11, 13–20) | Quasi-bidirectional I/O port | No direction register needed; outputs drive LOW actively, inputs float HIGH via internal weak pull-up (Itrt(pu) = 100 µA). |
| AD0, AD1, AD2 (Pins 21, 2, 3) | Slave address inputs | Set 6-bit slave address (A6–A0) with 64 combinations; unconnected pins must be tied to VDD or VSS for deterministic addressing. |
| SCL / SDA (Pins 22, 23) | I²C-bus clock/data | Fm+ compliant (1 MHz); SDA supports 30 mA sink for driving long traces or multiple loads without bus buffers. |
| VDD / VSS (Pins 24, 12) | Power supply | VDD accepts 2.3–5.5 V; VSS is die ground-must be connected to PCB ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| 1 MHz Fast-mode Plus I²C interface | Enables high-throughput I/O updates for time-critical applications like LED signage refresh cycles. |
| Latched outputs with 25 mA sink | Eliminates need for external driver stages when controlling LEDs, relays, or logic-level MOSFET gates. |
| 64 programmable slave addresses | Supports up to 64 expanders on one bus-ideal for modular PLC backplanes or multi-blade server chassis. |
| Readable device ID (manufacturer, type, revision) | Allows runtime firmware validation and automatic BOM version matching in field-upgradable systems. |
| Hardware RESET + software reset via General Call | Provides dual-recovery paths: hardware reset for brown-out recovery; software reset for coordinated system reinitialization. |
Applications
| LED Signage & Displays | Servers & Data Centers |
|---|---|
Use Scenario: Driving 16-channel LED matrix with individual brightness control via I²C. IC Role / Device Role / Timing Role: Remote I/O expander providing PWM-capable GPIO outputs synchronized to host controller timing. Use Value: 1 MHz I²C allows rapid frame updates; 25 mA per pin drives LEDs directly without discrete drivers, reducing BOM count by 16 components. |
Use Scenario: Monitoring and controlling status indicators, fans, and hot-swap controllers in 1U rack servers. IC Role / Device Role / Timing Role: System management I/O hub interfacing with baseboard management controller (BMC) over shared I²C bus. Use Value: 64 address options prevent conflicts in multi-node server architectures; 400 mA total sink handles all front-panel LEDs simultaneously. |
| Industrial PLCs | Medical Equipment Panels |
Use Scenario: Adding digital input/output points to compact programmable logic controllers for sensor actuation and relay control. IC Role / Device Role / Timing Role: Deterministic I/O extension with hardware RESET for fail-safe recovery during voltage transients. Use Value: −40 °C to +85 °C rating ensures reliability in factory-floor environments; quasi-bidirectional pins simplify wiring for both switch inputs and solenoid outputs. |
Use Scenario: Managing user interface LEDs, button inputs, and alarm indicators on diagnostic imaging devices. IC Role / Device Role / Timing Role: Safety-critical I/O interface with verified reset behavior and ESD-hardened pins for clinical handling. Use Value: 2000 V HBM ESD protection prevents field failures during technician interaction; readable device ID supports regulatory traceability requirements. |
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 |
|---|---|---|---|
| PCF8575T | 400 kHz I²C, 3 mA SDA sink, 100 mA total sink, 8 slave addresses, interrupt output instead of RESET. | Limited to low-speed, low-current I/O; lacks PWM support and high-density bus scalability. | Select only if legacy compatibility with existing PCF8575 firmware/hardware is mandatory and 1 MHz operation is unnecessary. |
| PCA9673D,118 | Same Fm+ features plus dedicated INT output (open-drain) and identical pinout/package; adds interrupt-on-change capability. | Required when host MCU must respond asynchronously to I/O state changes without polling. | Choose PCA9673D,118 when real-time event detection is critical; PCA9671D,118 is preferred when RESET functionality is prioritized over interrupt signaling. |
Compared with PCF8575T, PCA9671D,118 delivers 2.5× faster bus speed and 4× higher sink capacity-enabling denser, more responsive I/O systems. Versus PCA9673D,118, it trades interrupt capability for simplified reset-only control, reducing firmware complexity in polling-based architectures.
Availability
PCA9671D,118 is available at Aetrix Electronics and suitable for industrial control, server management, and medical equipment requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for PCA9671D,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 ecosystem components.
The PCA9671D,118 belongs to NXP's Fast-mode Plus I/O expander family, designed specifically to upgrade legacy I²C systems with higher speed, greater drive strength, and enhanced address flexibility-targeting industrial automation and data center infrastructure.
FAQ
What is the maximum I²C-bus speed supported by the PCA9671D,118?
The PCA9671D,118 supports Fast-mode Plus (Fm+) I²C operation up to 1 MHz, enabling faster data transfer than standard Fast-mode (400 kHz) devices. This allows efficient LED PWM dimming and reduces bus occupancy time in multi-device systems. The PCA9671D,118 maintains full backward compatibility with Standard-mode and Fast-mode I²C masters while delivering higher throughput.
Does the PCA9671D,118 have an interrupt output like the PCF8575?
No-the PCA9671D,118 replaces the PCF8575's interrupt output with an active-low RESET input. This design shift prioritizes deterministic hardware reset capability over asynchronous event notification. If interrupt-on-change functionality is required, the PCA9673D,118 is the functionally equivalent alternative with identical pinout and added INT pin.
Can the PCA9671D,118 drive LEDs directly without external components?
Yes-the PCA9671D,118 provides 25 mA sink current per I/O pin and 400 mA total package sink capacity, allowing direct connection of standard 20 mA LEDs with only series resistors. Its quasi-bidirectional architecture eliminates the need for direction-control logic, simplifying PCB layout and firmware implementation for LED signage and panel indicator applications.
How many unique slave addresses does the PCA9671D,118 support?
The PCA9671D,118 supports 64 unique slave addresses via three hardware address pins (AD0, AD1, AD2). Each combination selects a distinct 7-bit I²C address, enabling up to 64 expanders on a single bus without address conflicts-critical for scalable server management and modular PLC designs where PCF8575's 8-address limit is insufficient.
What is the operating voltage range and I/O tolerance of the PCA9671D,118?
The PCA9671D,118 operates from 2.3 V to 5.5 V and features 5.5 V-tolerant I/O pins, allowing seamless integration with mixed-voltage systems such as 3.3 V microcontrollers interfacing to 5 V peripherals. This eliminates level-shifting circuitry in industrial and medical equipment where supply rails vary across subsystems.
PCA9671D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of I/O:
- 16
- Interface:
- I2C
- Interrupt Output:
- No
- 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-SO
PCA9671D,118 FAQ
1.How can I place an order for PCA9671D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9671D,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 PCA9671D,118 reliable?
The price and inventory of PCA9671D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9671D,118 is usually 5 days.
3.What payment methods are accepted for PCA9671D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9671D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9671D,118?
PCA9671D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9671D,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 PCA9671D,118?
For technical support, including PCA9671D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9671D,118 requirements.
6.How does Aetrix verify that PCA9671D,118 is sourced from the original manufacturer or authorized distributors?
All PCA9671D,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 PCA9671D,118 meets industry standards.
7.What is the process for return or replacement of PCA9671D,118?
All PCA9671D,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9671D,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 PCA9671D,118 part is unused and in its original packaging.
Return procedure for PCA9671D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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