LM1871N

Overview

The LM1871N is a six-channel digital proportional encoder and RF transmitter manufactured by National Semiconductor. It operates as an RC Encoder/Transmitter designed for low-current applications, supporting nominal supply current of 14mA. The device features an on-chip 4.6V regulator, enabling efficient operation from a 9V battery. It supports carrier frequencies up to 80 MHz, with specific operational bands including 27MHz, 49MHz, and 72MHz. Packaged in an 18-PDIP format, the component integrates encoding and transmission functions into a single unit.

Feature Summary

• Integrates six-channel digital proportional encoding with RF transmission capabilities
• Includes an internal 4.6V voltage regulator for stable power management
• Optimized for low-current operation suitable for battery-powered systems

Applications

• Remote control encoder systems
• RF transmitter modules for short-range communication
• Battery-operated electronic devices requiring integrated encoding

Procurement Notes

Verify the manufacturer origin, as National Semiconductor assets are now part of Texas Instruments. Confirm the package type matches the required 18-PDIP specification. Check datasheet revisions to ensure compatibility with intended frequency ranges. Validate that the on-chip regulator meets system voltage requirements. Ensure the component is sourced from authorized distributors to guarantee authenticity.

Selection Notes

Select this component when a combined encoder and transmitter solution is required for remote control applications. Consider the 14mA nominal supply current for power budget calculations. Verify that the 80 MHz maximum carrier frequency aligns with regulatory and system constraints. Evaluate the 18-PDIP package against available PCB space and mounting requirements.

Part Context

The LM1871 series belongs to National Semiconductor's family of RC encoder/transmitters. The LM1871N variant specifically denotes the PDIP package version. Related parts include the LM1870 and LM1872, which offer similar encoding functionalities with potential variations in channel count or pinout configurations within the same product line.

Replacement Considerations

Direct substitutes may include the LM1870 or LM1872, depending on specific channel and interface requirements. Verify pin-to-pin compatibility before replacement. Ensure that any alternative component supports the necessary 80 MHz carrier frequency range and maintains comparable current consumption levels.