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NXP Semiconductors PCA9671DB,112
- Part No.:
- PCA9671DB,112
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCA9671DB,112.pdf
- Description:
- IC XPNDR 1MHZ I2C 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,015
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Product details
Overview
PCA9671DB,112 from NXP Semiconductors is a 16-bit remote I/O expander for Fast-mode Plus (Fm+) I²C-bus systems, providing quasi-bidirectional I/O with 25 mA sink per pin, 400 mA total package sink capacity, and 1 MHz I²C-bus operation. It replaces the PCF8575 with higher speed, stronger bus drive (30 mA SDA), 64 programmable slave addresses, and an active-low RESET input instead of interrupt output - enabling direct LED PWM dimming and high-density I/O expansion in space-constrained industrial and server applications.
For engineers reviewing the PCA9671DB,112 datasheet, PCA9671DB,112 pinout, PCA9671DB,112 application, or PCA9671DB,112 equivalent, key selection criteria include its 2.3–5.5 V supply range, 5.5 V-tolerant I/Os, latched outputs, Power-On Reset + hardware/software reset capability, and compatibility with SO24, TSSOP24, HVQFN24, and DHVQFN24 packages.
Technical Context
The PCA9671DB,112 implements a quasi-bidirectional I/O architecture where all 16 pins (P00–P07, P10–P17) default to HIGH at power-up and operate without direction-control signals. Its internal I²C-bus interface supports Fast-mode Plus (1 MHz) with 30 mA SDA sink capability, enabling reliable communication on heavily loaded buses up to 4000 pF.
It integrates a dedicated active-low RESET input (pin 1 in SO24/TSSOP24, pin 22 in HVQFN24/DHVQFN24), Power-On Reset circuitry, and a software-reset sequence via General Call address (00h) + data byte 06h - allowing full register initialization without external hardware assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C-bus Speed | 1 MHz Fast-mode Plus - enables real-time LED PWM dimming and reduces I/O polling latency vs. 400 kHz alternatives. |
| Supply Voltage | 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 - drives standard LEDs directly; eliminates external drivers in indicator and status-light applications. |
| Total Package Sink | 400 mA - allows simultaneous activation of all 16 I/Os at 25 mA each, supporting dense LED arrays or relay control banks. |
| Slave Addresses | 64 programmable options (via AD0/AD1/AD2) - scales I²C-bus node count without address conflicts in multi-device systems. |
| Operating Temp | −40 °C to +85 °C - qualified for industrial control, medical equipment, and telecom infrastructure environments. |
| ESD Protection | 2000 V HBM, 1000 V CDM - ensures robustness during handling and board-level integration in automated assembly lines. |
Pinout & Package
PCA9671DB,112 is supplied in SO24 package (SOT137-1), with 24-pin plastic small outline configuration (body width 7.5 mm). Pin functions are electrically identical across SO24, TSSOP24, HVQFN24, and DHVQFN24 variants.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low hardware reset input - holds registers and I²C state machine in default state until deasserted; enables synchronized recovery after system faults. |
| 2–3, 21 | AD1, AD2, AD0 | Address inputs - configure one of 64 slave addresses; no internal pull-ups, requiring external biasing for deterministic addressing. |
| 4–11, 13–20 | P00–P07, P10–P17 | Quasi-bidirectional I/O ports - latch outputs and sample inputs; default HIGH at power-up; tolerate 5.5 V with 2.3–5.5 V VDD. |
| 12, 24 | VSS, VDD | Supply ground and voltage - VSS must be connected; VDD powers logic and I/O; 5.5 V tolerant I/Os decouple from VDD rail constraints. |
| 22, 23 | SCL, SDA | I²C-bus clock and bidirectional data - SDA supports 30 mA sink for 4000 pF bus loads; both pins comply with Standard/Fast-mode timing. |
Key Features
| Feature | Design Value |
|---|---|
| 1 MHz Fm+ I²C Interface | Enables faster I/O updates than PCF8575 (400 kHz), reducing bus occupancy and supporting time-critical LED dimming sequences. |
| Latched Output Architecture | Maintains stable I/O states during bus arbitration or master interruptions - critical for driving relays, solenoids, or status indicators reliably. |
| Hardware + Software Reset | Combines dedicated RESET pin with I²C General Call + 06h sequence - provides dual-path recovery for embedded systems with no reset controller. |
| Readable Device ID | 24-bit read-only field (manufacturer, part ID, revision) accessible via reserved Device ID address - enables firmware-based device validation and BOM traceability. |
| 64 Slave Addresses | Triple address pin (AD0/AD1/AD2) mapping to 7-bit address bits A6–A0 - supports up to 64 expanders on one bus, ideal for modular PLC or server backplane designs. |
Applications
| LED Signs and Displays | Servers |
|---|---|
|
Use Scenario: Driving 16-channel alphanumeric LED displays or segment-based status panels in network equipment racks. IC Role / Device Role / Timing Role: Remote I/O expander managing LED anode/cathode switching via quasi-bidirectional ports with 25 mA sink per channel. Use Value: Eliminates need for discrete transistors or LED drivers; 1 MHz I²C allows dynamic brightness control without visible flicker. |
Use Scenario: Monitoring and controlling power sequencing, fan speeds, and status LEDs across multiple server blades in a chassis. IC Role / Device Role / Timing Role: System management I/O hub interfacing with baseboard management controller (BMC) over I²C-bus. Use Value: 64 address options prevent bus conflicts in multi-blade systems; 400 mA total sink supports concurrent fan control and fault signaling. |
| Industrial Control | Medical Equipment |
|
Use Scenario: Isolating microcontroller GPIOs from noisy 24 V DC field I/O in PLC modules and motor control interfaces. IC Role / Device Role / Timing Role: Digital I/O expansion with latch retention and hardware reset for deterministic startup in safety-critical automation. Use Value: −40 °C to +85 °C rating and 2000 V HBM ESD ensure reliability in factory-floor environments with electrical transients. |
Use Scenario: Managing front-panel buttons, indicators, and sensor enable lines in portable diagnostic devices and imaging systems. IC Role / Device Role / Timing Role: Low-power I/O extender with Power-On Reset and software reset for fail-safe initialization in battery-powered medical instruments. Use Value: 2.3 V minimum VDD enables operation down to near-end-of-life battery voltage; readable Device ID supports regulatory firmware audit trails. |
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 |
|---|---|---|---|
| PCF8575CD,112 | 400 kHz I²C, 3 mA SDA drive, 100 mA total sink, 8 addresses, interrupt output (INT) instead of RESET. | Lacks hardware reset and high-speed PWM support; suitable only for low-bandwidth, low-current I/O tasks. | Select when cost sensitivity outweighs performance needs and existing designs use INT-driven polling. |
| PCA9673BS,118 | Includes dedicated INT output (replaces RESET), same 1 MHz I²C, 25 mA/pin, 400 mA sink, 64 addresses. | Provides interrupt-driven I/O change detection - essential for low-latency event response in real-time systems. | Choose when immediate notification of input transitions is required, and hardware reset is handled elsewhere. |
Compared with PCF8575CD,112, PCA9671DB,112 delivers 2.5× faster I²C, 10× stronger bus drive, and 4× higher total sink current - enabling denser LED arrays and more robust multi-drop networks. Versus PCA9673BS,118, it trades interrupt capability for hardware reset, simplifying fault-recovery design where deterministic initialization is prioritized over edge-triggered notifications.
Availability
PCA9671DB,112 is available at Aetrix Electronics and suitable for industrial control, server management, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for PCA9671DB,112 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in I²C-bus peripherals and mixed-signal interface ICs.
The PCA9671DB,112 belongs to NXP's Fast-mode Plus I²C I/O expander product line, designed specifically to upgrade legacy PCF857x systems with higher bandwidth, greater drive strength, and enhanced system-level reset control.
FAQ
What is the primary function of the PCA9671DB,112 in an embedded system?
The PCA9671DB,112 serves as a 16-bit remote I/O expander that extends microcontroller GPIO resources via a 1 MHz Fast-mode Plus I²C-bus interface. It provides latched quasi-bidirectional I/O ports with 25 mA sink capability per pin and 400 mA total package sink - enabling direct LED driving, switch monitoring, and relay control without external buffering. Its active-low RESET input and software reset capability ensure deterministic initialization in mission-critical applications.
How does the PCA9671DB,112 differ from the PCF8575 in terms of I²C-bus performance?
The PCA9671DB,112 operates at 1 MHz Fast-mode Plus versus the PCF8575's 400 kHz Fast-mode, delivering 2.5× faster I/O update rates. It also provides 30 mA SDA sink drive (vs. 3 mA) for reliable communication on 4000 pF buses, and supports 64 slave addresses (vs. 8), significantly increasing node density. Crucially, PCA9671DB,112 replaces the PCF8575's interrupt output with a hardware RESET input - shifting focus from event notification to robust system recovery.
Can the PCA9671DB,112 directly drive LEDs, and what are the current limits?
Yes, the PCA9671DB,112 can directly drive LEDs using its 16 quasi-bidirectional I/O pins, each rated for 25 mA sink current. The total package sink capacity is 400 mA, allowing all 16 outputs to be active simultaneously at 25 mA each. This eliminates the need for external transistor drivers in indicator, status, or display applications - provided the VDD supply and PCB thermal design support sustained 400 mA load.
What package types are available for the PCA9671DB,112, and which one is used in this variant?
The PCA9671DB,112 is offered in SO24 (SOT137-1), TSSOP24 (SOT355-1), HVQFN24 (SOT616-1), and DHVQFN24 (SOT815-1) packages. The "DB" suffix in PCA9671DB,112 specifically denotes the SO24 package - a plastic small outline format with 24 leads and 7.5 mm body width, optimized for through-hole or surface-mount assembly in industrial and server PCBs.
Does the PCA9671DB,112 support software-initiated reset, and how is it executed?
Yes, the PCA9671DB,112 supports software reset via the I²C-bus General Call address (00h) followed by data byte 06h. After a START condition, the master sends 00h (write), receives acknowledgment, then transmits 06h - which the PCA9671DB,112 acknowledges only if correct. A STOP condition completes the sequence, resetting all registers to power-up defaults. This complements the hardware RESET pin and enables full recovery without physical intervention.
PCA9671DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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-SSOP
PCA9671DB,112 FAQ
1.How can I place an order for PCA9671DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9671DB,112 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 PCA9671DB,112 reliable?
The price and inventory of PCA9671DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9671DB,112 is usually 5 days.
3.What payment methods are accepted for PCA9671DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9671DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9671DB,112?
PCA9671DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9671DB,112 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 PCA9671DB,112?
For technical support, including PCA9671DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9671DB,112 requirements.
6.How does Aetrix verify that PCA9671DB,112 is sourced from the original manufacturer or authorized distributors?
All PCA9671DB,112 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 PCA9671DB,112 meets industry standards.
7.What is the process for return or replacement of PCA9671DB,112?
All PCA9671DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9671DB,112, 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 PCA9671DB,112 part is unused and in its original packaging.
Return procedure for PCA9671DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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