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Product Detailed Parameters
- Description：VIDEO AMPLIFIER, 3 CHANNEL
- Series：-
- Mfr：National Semiconductor
- Package：Tube
- Applications：General Purpose
- Output Type：-
- Number of Circuits：3
- Slew Rate：-
- Current - Supply：95 mA
- Current - Output / Channel：28 mA
- Voltage - Supply, Single/Dual (±)：11.4V ~ 12.6V
- Mounting Type：Through Hole
- Package / Case：28-DIP (0.600", 15.24mm)
- Supplier Device Package：28-DIP
- -3db Bandwidth：85 MHz
- Grade：-
- Qualification：-
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Overview
The LM1281N is an obsolete triple video amplifier system manufactured by National Semiconductor, designed for RGB video applications with integrated On-Screen Display (OSD) capabilities. It features a -3dB bandwidth of 85 MHz and operates with a supply current of 95 mA. The component is housed in a 28-pin DIP package with a width of 0.600 inches (15.24 mm). It contains three internal circuits intended for use in monitors supporting resolutions up to standard general-purpose specifications.
Feature Summary
- Integrates On-Screen Display (OSD) functionality within the video amplifier system
- Provides triple channel amplification for RGB signal processing
- Designed for monitor applications with specified resolution support
Applications
- Video monitors requiring RGB amplification
- Systems utilizing On-Screen Display overlays
- General purpose video signal processing circuits
Procurement Notes
Verify component status as obsolete before procurement planning. Confirm package dimensions match existing board layouts. Check for available replacement equivalents from National Semiconductor or Texas Instruments due to discontinuation. Ensure compatibility with existing OSD signal requirements.
Selection Notes
Select this component only if legacy design compatibility is required. Verify that the 85 MHz bandwidth meets specific video resolution needs. Consider the 28-DIP package constraints for assembly processes. Evaluate alternative active components if new designs are permitted.
Part Context
This part belongs to the National Semiconductor video amplifier family. It serves as a specialized solution for integrating OSD signals into RGB video paths. The device was widely used in CRT-based display systems where high-frequency video amplification and text overlay were necessary within a single integrated circuit package.
Replacement Considerations
Check for direct pin-compatible substitutes from Texas Instruments, which acquired National Semiconductor. Verify electrical parameters such as bandwidth and supply current against potential replacement parts.
