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LC4256ZE-5TN100C
Electronics Part Number
LC4256ZE-5TN100C-WXManufacturer
NXP Semiconductors
LC4256ZE-5TN100C
Description
CPLD, 256 Macrocells, 5.8ns, 100-TQFPInventory
441 Pcs New Original In Stock
"2-channel DUART IC, RS485, 64-byte FIFO, 32-VQFN (5x5). Compact dual serial transceiver, buffered. For embedded RS485 and industrial communication.",
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Technical Specifications
Category
Interface, I/O Expanders
Manufacturer
NXP Semiconductors
Packaging
Tape & Reel (TR)
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-VFQFN Exposed Pad
Series
-
Features
POR
Base Product Number
PCA9671
Product Status
Active
Output Type
Push-Pull
Voltage - Supply
2.3V ~ 5.5V
Supplier Device Package
24-HVQFN (4x4)
Interface
I2C
DiGi-Electronics Programmable
Not Verified
Current - Output Source/Sink
100µA, 25mA
Number of I/O
16
Interrupt Output
No
Clock Frequency
1 MHz
Data Sheet Document (D)
Datasheets
Download PCA9671BS,118 Product Specification (PDF)
HTML Datasheet
PCA9671BS,118-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
568-8718-2 PCA9671BS,118-DG 568-8718-1 PCA9671BS-T-DG 935283369118 PCA9671BS-T 568-8718-6 PCA9671BS118
Standard Package
6,000
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Frequently Asked Questions (FAQ)
What are the key design risks when using the PCA9671BS,118 as a direct replacement for the MCP23017
The PCA9671BS,118 lacks an interrupt output and has a fixed I2C address (no address pins), unlike the MCP23017, which supports configurable addresses and interrupt-driven input change detection. This makes the PCA9671BS,118 unsuitable for applications requiring real-time input monitoring without polling. Additionally, while both support 3.3V operation, the PCA9671BS,118’s push-pull outputs may cause bus contention if connected to open-drain systems designed for the MCP23017. To mitigate, ensure your firmware implements periodic I2C polling for input states and verify signal compatibility with downstream logic. Consider adding external pull-ups only if interfacing with open-drain peripherals.
Can the PCA9671BS,118 safely drive 24V relay coils through optocouplers in a noisy factory environme
Yes, but with caveats. The PCA9671BS,118 can source/sink up to 25mA per pin, which is sufficient for most optocoupler LEDs (e.g., PC817 or LTV-817), but you must include a series current-limiting resistor to stay within the 100µA–25mA range. Since the device lacks built-in ESD or transient protection beyond standard CMOS levels, add TVS diodes on I/O lines exposed to industrial noise and use separate ground planes with a single-point connection to minimize ground bounce. Also, place decoupling capacitors (100nF ceramic) as close as possible to the VDD pin to maintain stability under inductive load switching.
How does the absence of configurable I2C addressing on the PCA9671BS,118 impact system scalability i
The PCA9671BS,118 has a fixed I2C address (typically 0x20 or similar, depending on internal strapping), limiting you to only one device per bus unless you use an I2C multiplexer like the TCA9548A. In contrast, expanders such as the PCA9555 or MCP23017 offer 3 address pins for up to 8 devices on one bus. If your design requires multiple I/O expanders, consider using the TCA9548A to create separate I2C channels—each hosting one PCA9671BS,118—or switch to a more flexible alternative. This adds cost and complexity but preserves real-time responsiveness and reduces polling overhead.
Is the PCA9671BS,118 suitable for battery-powered IoT edge nodes operating at 2.5V, and how does its
The PCA9671BS,118 operates down to 2.3V, making it technically viable for 2.5V battery systems, but its lack of interrupt output forces continuous polling, increasing average current draw compared to interrupt-capable devices like the PCA9554. In sleep-mode scenarios, the PCA9671BS,118 offers no power-down state beyond disabling outputs, whereas the PCA9554 supports a true low-power shutdown. For ultra-low-power designs, consider adding an external microcontroller sleep/wake controller or switching to the PCA9554 if address flexibility allows. Always validate brownout behavior using a POR (Power-On Reset) supervisor circuit, as the internal POR may not guarantee clean resets near the 2.3V threshold.
What reliability concerns should I evaluate when deploying the PCA9671BS,118 in an automotive under-
Although the PCA9671BS,118 is rated for -40°C to +85°C, sustained operation near 85°C reduces long-term reliability due to electromigration and package stress, especially in the 24-HVQFN (4x4) exposed-pad package. Ensure proper thermal vias under the exposed pad to a ground plane for heat dissipation. Also, verify that your solder reflow profile complies with MSL 1 requirements to prevent moisture-induced cracking. Unlike automotive-qualified parts (e.g., AEC-Q100 certified devices), the PCA9671BS,118 is not formally rated for automotive use—consider the NXP PCA9671PW (TSSOP package, broader temp validation) or migrate to an AEC-Q100 part like the TCA6408A if mission-critical reliability is required.
What are the key design risks when using the PCA9671BS,118 as a direct replacement for the MCP23017
The PCA9671BS,118 lacks an interrupt output and has a fixed I2C address (no address pins), unlike the MCP23017, which supports configurable addresses and interrupt-driven input change detection. This makes the PCA9671BS,118 unsuitable for applications requiring real-time input monitoring without polling. Additionally, while both support 3.3V operation, the PCA9671BS,118’s push-pull outputs may cause bus contention if connected to open-drain systems designed for the MCP23017. To mitigate, ensure your firmware implements periodic I2C polling for input states and verify signal compatibility with downstream logic. Consider adding external pull-ups only if interfacing with open-drain peripherals.
Can the PCA9671BS,118 safely drive 24V relay coils through optocouplers in a noisy factory environme
Yes, but with caveats. The PCA9671BS,118 can source/sink up to 25mA per pin, which is sufficient for most optocoupler LEDs (e.g., PC817 or LTV-817), but you must include a series current-limiting resistor to stay within the 100µA–25mA range. Since the device lacks built-in ESD or transient protection beyond standard CMOS levels, add TVS diodes on I/O lines exposed to industrial noise and use separate ground planes with a single-point connection to minimize ground bounce. Also, place decoupling capacitors (100nF ceramic) as close as possible to the VDD pin to maintain stability under inductive load switching.
How does the absence of configurable I2C addressing on the PCA9671BS,118 impact system scalability i
The PCA9671BS,118 has a fixed I2C address (typically 0x20 or similar, depending on internal strapping), limiting you to only one device per bus unless you use an I2C multiplexer like the TCA9548A. In contrast, expanders such as the PCA9555 or MCP23017 offer 3 address pins for up to 8 devices on one bus. If your design requires multiple I/O expanders, consider using the TCA9548A to create separate I2C channels—each hosting one PCA9671BS,118—or switch to a more flexible alternative. This adds cost and complexity but preserves real-time responsiveness and reduces polling overhead.
Is the PCA9671BS,118 suitable for battery-powered IoT edge nodes operating at 2.5V, and how does its
The PCA9671BS,118 operates down to 2.3V, making it technically viable for 2.5V battery systems, but its lack of interrupt output forces continuous polling, increasing average current draw compared to interrupt-capable devices like the PCA9554. In sleep-mode scenarios, the PCA9671BS,118 offers no power-down state beyond disabling outputs, whereas the PCA9554 supports a true low-power shutdown. For ultra-low-power designs, consider adding an external microcontroller sleep/wake controller or switching to the PCA9554 if address flexibility allows. Always validate brownout behavior using a POR (Power-On Reset) supervisor circuit, as the internal POR may not guarantee clean resets near the 2.3V threshold.
What reliability concerns should I evaluate when deploying the PCA9671BS,118 in an automotive under-
Although the PCA9671BS,118 is rated for -40°C to +85°C, sustained operation near 85°C reduces long-term reliability due to electromigration and package stress, especially in the 24-HVQFN (4x4) exposed-pad package. Ensure proper thermal vias under the exposed pad to a ground plane for heat dissipation. Also, verify that your solder reflow profile complies with MSL 1 requirements to prevent moisture-induced cracking. Unlike automotive-qualified parts (e.g., AEC-Q100 certified devices), the PCA9671BS,118 is not formally rated for automotive use—consider the NXP PCA9671PW (TSSOP package, broader temp validation) or migrate to an AEC-Q100 part like the TCA6408A if mission-critical reliability is required.
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Sep 15 2026
