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NXP Semiconductors PCA9674AD,512
- Part No.:
- PCA9674AD,512
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PCA9674AD,512.pdf
- Description:
- IC XPNDR 1MHZ I2C 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,154
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Product details
Overview
PCA9674AD,512 from NXP Semiconductors is an 8-bit remote I/O expander for Fast-mode Plus (Fm+) I²C-bus with interrupt output, operating from 2.3 V to 5.5 V, supporting 1 MHz I²C communication, 25 mA per port sink drive for direct LED control, and active-low open-drain INT signal. It serves as a parallel port extender in embedded systems requiring scalable GPIO expansion without bus buffers.
For engineers reviewing the PCA9674AD,512 datasheet, PCA9674AD,512 pinout, PCA9674AD,512 application, or PCA9674AD,512 equivalent, key selection factors include its 62 programmable slave addresses (PCA9674A variant), quasi-bidirectional I/O architecture, 4.5 µA typical standby current, and SO16 package compatibility with industrial temperature range (−40 °C to +85 °C).
Technical Context
The PCA9674AD,512 implements a quasi-bidirectional I/O structure with no direction register-each of the eight ports (P0–P7) defaults to input at power-up with a 100 µA weak pull-up, and can be independently driven low via internal NMOS sink (25 mA max per pin). Its Fm+ interface supports 1 MHz clocking and 30 mA SDA sink capability for driving 4000 pF buses.
Interrupt logic monitors input state changes against the input port register and asserts the active-low open-drain INT output; internal Power-On Reset initializes all I/Os as inputs. Software Reset (via General Call address 00h + data byte 06h) restores default register states without hardware reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Bus Speed | 1 MHz Fast-mode Plus (Fm+) - enables high-speed peripheral expansion without timing bottlenecks in real-time systems. |
| Supply Voltage Range | 2.3 V to 5.5 V - supports mixed-voltage designs including 3.3 V and 5 V microcontrollers. |
| I/O Sink Current | 25 mA per port (P0–P7) - drives LEDs directly without external drivers, reducing BOM count. |
| Standby Current | 4.5 µA typical - suitable for battery-powered mobile and IoT edge devices requiring ultra-low quiescent power. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial and automotive-adjacent environments. |
| Slave Addresses | 62 unique addresses (PCA9674A variant) via AD0/AD1/AD2 pins - allows up to 62 expanders on one I²C bus without address conflict. |
| ESD Protection | 2000 V HBM, 1000 V CDM - robust handling during board assembly and field operation. |
Pinout & Package
PCA9674AD,512 is housed in a 16-pin SOIC (SO16) package (SOT162-1), 7.5 mm body width, surface-mount compatible, with standard marking and dry-pack tube delivery (1920 pcs/tube).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AD0–AD2 | Hardware address inputs | Select one of 62 slave addresses; tied to VDD/VSS/SDA/SCL to decode non-overlapping I²C addresses for PCA9674A. |
| P0–P7 | Quasi-bidirectional I/O ports | Each pin functions as input (with 100 µA weak pull-up) or output (25 mA sink); no direction register required. |
| INT | Active-low open-drain interrupt | Signals input state change to host MCU; requires external pull-up; eliminates polling overhead. |
| SDA / SCL | I²C bidirectional data/clock | Fm+ compliant; SDA supports 30 mA sink for high-capacitance bus segments. |
| VDD / VSS | Power supply and ground | Operates from 2.3 V to 5.5 V; I/Os are 5.5 V tolerant when VDD ≤ 5.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Quasi-bidirectional I/O architecture | Eliminates need for direction register and separate configuration commands - simplifies firmware and reduces I²C transaction count. |
| Software Reset via General Call | Restores all registers to power-on defaults using I²C command (00h + 06h), enabling remote recovery without hardware reset line. |
| Readable Device ID | 24-bit read-only field (manufacturer, part ID, revision) accessible via reserved I²C address F8h - supports automated BOM verification and field diagnostics. |
| High-current sink per port | 25 mA per I/O (200 mA total package sink) - drives multiple LEDs or logic-level loads directly, avoiding discrete transistors. |
| Interrupt-driven input monitoring | INT asserts only when input state differs from input port register - enables event-driven host response instead of periodic polling. |
Applications
| LED Signage Control | Industrial Keypad Interface |
|---|---|
Use Scenario: Driving 8-segment alphanumeric displays and status indicators in outdoor signage cabinets with limited PCB space. IC Role / Device Role / Timing Role: Remote I/O expander providing parallel GPIO extension over compact 2-wire I²C link; handles PWM dimming synchronization via fast 1 MHz bus. Use Value: Reduces host MCU GPIO usage by 8 pins per device; 25 mA sink per port eliminates external LED driver ICs, lowering system cost and thermal load. | Use Scenario: Scanning matrix keypads in programmable logic controllers (PLCs) deployed in factory automation environments. IC Role / Device Role / Timing Role: Input monitor with interrupt-driven edge detection; latched input port registers capture keypress events asynchronously. Use Value: INT output signals key activity to host MCU without polling; −40 °C to +85 °C rating ensures reliable operation in unconditioned industrial enclosures. |
| Server Rack Management | Medical Device Status Panel |
Use Scenario: Monitoring fan presence, power supply status, and hot-swap bay sensors across multi-slot server backplanes. IC Role / Device Role / Timing Role: Remote sensor interface with configurable quasi-bidirectional pins; reads TTL-level signals and drives status LEDs. Use Value: 62 unique I²C addresses allow daisy-chaining >60 expanders on single bus - scales to 1008 I/Os for large rack systems. | Use Scenario: Controlling indicator lights and reading emergency stop button states in portable diagnostic equipment. IC Role / Device Role / Timing Role: Safety-critical I/O buffer with ESD-hardened pins (2000 V HBM) and latch-up immunity (>100 mA per JEDEC JESD78). Use Value: 4.5 µA standby current extends battery life in handheld units; open-drain INT integrates cleanly with medical-grade MCU interrupt controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I/O expansion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9674D,512 | Same SO16 package and pinout, but PCA9674 (not PCA9674A) - uses 64-address map including General Call (00h) and Device ID (F8h) addresses. | Compatible in systems where General Call reset or Device ID read must be supported without address conflict with PCA9674A devices. | Select PCA9674D,512 if full 64-address range and General Call reset functionality are required; PCA9674AD,512 excludes those two addresses to avoid conflicts in mixed deployments. |
| PCA9674PW,112 | TSSOP16 package (SOT403-1), identical electrical specs and function; same PCA9674A address map and feature set. | Suitable for space-constrained PCBs where SO16 footprint is too large; requires re-layout but no firmware changes. | Choose PCA9674PW,112 for high-density layouts; thermal performance differs slightly due to TSSOP's lower thermal resistance vs. SO16. |
Compared with PCA9674D,512 and PCA9674PW,112, the PCA9674AD,512 provides identical I/O functionality and interrupt behavior in SO16 packaging, but reserves General Call and Device ID addresses to prevent bus conflicts in large-scale deployments - making it optimal for systems integrating >60 expanders on one I²C segment.
Availability
PCA9674AD,512 is available at Aetrix Electronics and suitable for LED signage control, industrial keypad interfaces, and server rack management requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for PCA9674AD,512 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.
The PCA9674/74A product line delivers scalable, low-power I²C-based GPIO expansion targeting resource-constrained embedded systems needing interrupt-driven peripheral control and direct LED drive capability.
FAQ
What is the I²C address range supported by PCA9674AD,512?
The PCA9674AD,512 belongs to the PCA9674A family and supports 62 unique 7-bit slave addresses (excluding General Call 00h and Device ID F8h), selectable via AD0/AD1/AD2 pins tied to VDD, VSS, SDA, or SCL. This non-overlapping address space enables up to 62 PCA9674AD,512 devices on a single I²C bus without conflict.
Does PCA9674AD,512 support direct LED driving?
Yes, PCA9674AD,512 supports direct LED driving: each of its eight quasi-bidirectional ports (P0–P7) provides 25 mA sink current capability, and the total package sink capacity is 200 mA. Its 100 µA weak internal pull-up and strong NMOS sink eliminate the need for external drivers in most indicator applications.
How does the interrupt output (INT) of PCA9674AD,512 operate?
The INT pin of PCA9674AD,512 is an active-low open-drain output that asserts when any input port state differs from its corresponding input port register value. It requires an external pull-up resistor and connects directly to a microcontroller's interrupt input, enabling event-driven response instead of continuous polling of the I²C bus.
What is the power supply range and operating temperature for PCA9674AD,512?
PCA9674AD,512 operates from 2.3 V to 5.5 V supply voltage and is rated for −40 °C to +85 °C ambient temperature. Its I/O pins are 5.5 V tolerant when VDD ≤ 5.5 V, and it draws only 4.5 µA typical standby current - making it suitable for both industrial and battery-powered applications.
Can PCA9674AD,512 be reset remotely over the I²C bus?
Yes, PCA9674AD,512 supports Software Reset via I²C: the host sends General Call address 00h (write), followed by data byte 06h, then STOP. This resets all registers to power-on defaults - including I/O direction and interrupt state - without requiring a hardware reset signal or power cycle.
PCA9674AD,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of I/O:
- 8
- 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:
- 16-SO
PCA9674AD,512 FAQ
1.How can I place an order for PCA9674AD,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9674AD,512 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 PCA9674AD,512 reliable?
The price and inventory of PCA9674AD,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9674AD,512 is usually 5 days.
3.What payment methods are accepted for PCA9674AD,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9674AD,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9674AD,512?
PCA9674AD,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9674AD,512 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 PCA9674AD,512?
For technical support, including PCA9674AD,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9674AD,512 requirements.
6.How does Aetrix verify that PCA9674AD,512 is sourced from the original manufacturer or authorized distributors?
All PCA9674AD,512 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 PCA9674AD,512 meets industry standards.
7.What is the process for return or replacement of PCA9674AD,512?
All PCA9674AD,512 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9674AD,512, 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 PCA9674AD,512 part is unused and in its original packaging.
Return procedure for PCA9674AD,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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