LM2439T/NOPB

Overview

The LM2439T/NOPB is a monolithic triple CRT driver designed for color monitor applications. It integrates three high input impedance, wide band amplifiers that directly drive RGB cathodes with an internally set gain of -14. The device operates within a supply voltage range of +60V to +85V and a bias voltage of +8V to +15V. It supports pixel clock frequencies up to 75 MHz and features rise times of 9 ns and fall times of 11 ns. Packaged in a 9-lead TO-220 molded plastic power package, it dissipates approximately 50% less power than the LM2406.

Feature Summary

• Integrates three high input impedance, wide band amplifiers for direct RGB cathode driving
• Internally fixed gain of -14 per channel
• Stable operation with capacitive loads ranging from 0 pF to 20 pF
• Compatible with standard LM243X family pinout for simplified PCB layout

Applications

• 1024 x 768 Displays up to 70 Hz Refresh
• Pixel clock frequencies up to 75 MHz
• Monitors using video blanking

Procurement Notes

Verify the component matches the specific Texas Instruments LM2439T/NOPB designation. Confirm the package type is the industry-standard 9-lead TO-220 molded plastic power package. Ensure the ordering suffix corresponds to the correct variant. Cross-reference datasheet SNOS442 for accurate electrical specifications and thermal considerations before integration.

Selection Notes

Select this component for high-resolution display applications requiring direct CRT cathode driving. It is suitable as a replacement for discrete CRT drivers and pairs well with the LM1279 video preamp. Consider thermal management requirements, as the case temperature must remain below 115°C. Evaluate load capacitance effects on speed and ensure proper power supply bypassing to prevent oscillation.

Part Context

The LM2439 belongs to the LM243X family of monolithic CRT drivers manufactured by Texas Instruments (formerly National Semiconductor). It is specifically engineered for VGA to XGA resolution markets. The device simplifies monitor design by integrating multiple amplifier channels into a single high-voltage package, reducing component count compared to discrete solutions.

Replacement Considerations

LM2439T