LM2439T

Overview

The LM2439T is a monolithic triple CRT driver manufactured by National Semiconductor, now part of Texas Instruments. It features a propagation delay of 9.5 ns and is designed for high-speed video applications. The device operates from a single supply voltage ranging from 4.5 V to 7 V. It integrates three independent output channels capable of driving CRT deflection circuits with fast rise and fall times. The component is housed in a plastic DIP package suitable for through-hole mounting.

Feature Summary

• Integrates three independent high-speed output drivers on a single chip
• Optimized for direct drive of CRT deflection yokes
• Operates from a single low-voltage power supply
• Provides fast signal propagation with minimal distortion

Applications

• Color and monochrome CRT display systems
• Video signal processing circuits
• Deflection amplifier stages in television sets
• Oscilloscope vertical and horizontal amplifiers

Procurement Notes

Verify the manufacturer origin as National Semiconductor or Texas Instruments due to corporate acquisition history. Confirm the suffix 'T' indicates the specific tape-and-reel or packaging variant if required by assembly specifications. Ensure compatibility with legacy single-supply voltage requirements of 4.5 V to 7 V for proper circuit integration.

Selection Notes

Select this component when designing CRT-based video equipment requiring integrated triple-channel driving capabilities. It serves as a direct replacement for older discrete driver solutions. Consider the 9.5 ns propagation delay for timing-sensitive video paths. Verify that the single-supply operation aligns with the system's power architecture without requiring complex dual-rail generation.

Part Context

The LM2439 belongs to the LM24xx series of CRT drivers developed by National Semiconductor. This family was widely used in analog video display technology before the transition to flat-panel displays. The device represents a specialized integrated circuit solution for managing high-frequency deflection signals in cathode ray tube applications.

Replacement Considerations

Compatible substitutes include other members of the LM24xx series such as the LM2408, LM2409, LM2412, LM2415, LM2463, LM2470, LM2432, and LM2433. These parts offer similar triple-driver architectures with varying propagation delays and bandwidths suitable for different CRT resolution standards.