LM2435T/NOPB

Overview

The LM2435T/NOPB is a monolithic triple CRT driver circuit designed for color monitor applications. It integrates three high input impedance, wide band amplifiers that directly drive RGB cathodes with an internal gain of -14. The device operates within a supply voltage range of +60V to +85V and accepts a 0V to 5V input signal. Key electrical parameters include a typical rise time of 5.5 ns and fall time of 6.0 ns. It supports pixel clock frequencies up to 135 MHz and is housed in a 9-lead TO-220 package.

Feature Summary

• Integrates three high input impedance, wide band amplifiers for direct CRT cathode driving
• Internally set gain of -14 per channel
• Stable operation with capacitive loads ranging from 0 pF to 20 pF
• Compatible with inductive peaking networks

Applications

• 1280 x 1024 Displays up to 75 Hz Refresh
• Monitors using video blanking
• High resolution display applications

Procurement Notes

Verify the component manufacturer history, as Texas Instruments acquired National Semiconductor, which originally produced this part. Confirm the datasheet revision (SNOS454A) matches your design requirements. Ensure the TO-220 staggered lead package aligns with your PCB footprint and thermal management strategy. Check for any specific ordering suffixes or environmental compliance markings on the physical device.

Selection Notes

Select this component for high-resolution monitor designs requiring fast transient response and direct CRT drive capability. Consider the thermal dissipation requirements, as the device dissipates significant power and requires a heatsink connected to PCB ground. Evaluate the need for arc protection components, such as clamp diodes and inductors, to safeguard against CRT arcing events during operation.

Part Context

The LM2435 belongs to the LM243X family of CRT drivers. It is well matched with video preamplifiers like the LM1279 and LM1282/83 to form complete video channels. The standard pinout facilitates easy PCB layout. This series targets SXGA resolution markets, offering improved power efficiency compared to predecessors like the LM2405.

Replacement Considerations

LM2435MX/NOPB