TSH345IDT

Overview

The TSH345IDT is a triple single-supply video buffer featuring an internal gain of 6 dB and selectable filtering for HD and SD video outputs on 75 Ω video lines. It includes an internal input DC level shifter optimized to keep output signals between rails for maximum linearity, eliminating the need for input or output capacitors when using a single 5 V power supply. The device contains three matched amplifiers specified for 150 Ω loads and offers selectable 6th order filtering at 36 MHz, 18 MHz, and 9 MHz. It is available in SO-14 and TSSOP-14 plastic packages.

Feature Summary

• Internal input DC level shifter allows driving video signals on 75 Ω lines without damaging synchronization tips
• Selectable 6th order filtering supports 36 MHz, 18 MHz, and 9 MHz configurations
• Very low harmonic distortion with AC or DC output-coupled capability
• No input capacitor required due to integrated DC level shifting

Applications

• Driving YC, CVBS, YUV, YPbPr, or RGB signals from video DAC outputs
• HD and SD video applications requiring 75 Ω video line buffering
• Single 5 V power supply video signal conditioning

Procurement Notes

Verify component status as obsolete before procurement planning. Confirm package type matches design requirements, as the part is available in SO-14 and TSSOP-14 formats. Ensure compatibility with existing 75 Ω video line infrastructure and 5 V single-supply systems. Review datasheet specifications for load conditions and filtering options to validate performance in current application context.

Selection Notes

Select this component for designs requiring triple video buffering with integrated DC level shifting to eliminate external coupling capacitors. The internal 6 dB gain and selectable filtering simplify circuit topology for HD and SD video paths. Verify that the 150 Ω load specification aligns with downstream impedance requirements. Consider the obsolete status when designing new products requiring long-term availability.

Part Context

The TSH345IDT belongs to STMicroelectronics' video buffer and amplifier portfolio, specifically designed for analog video signal processing. It serves as a specialized solution for driving standard definition and high definition video signals over coaxial cables. The device integrates multiple functions typically requiring discrete components, reducing board space and complexity in video transmission circuits.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Due to the obsolete marketing status, alternative components must be identified through independent cross-reference tools or manufacturer recommendations for equivalent triple video buffers with similar filtering and DC level shifting capabilities.