Thyristor protects CVBS signal lines against over-voltage transients

Designed to protect composite video blanking synchronisation (CVBS) signal lines and ports from damage due to over-voltage transients, the PxxxxS4xLRP series SIDACtor protection thyristor has been released by Littelfuse.

The PxxxxS4xLRP Series is a compact, surface-mount thyristor which simplifies designing it into it into a PCB layout, says Littelfuse. For example, the P0080S4BLRP combines a 6.0V operating voltage and 100A 5/310 micro second surge peak current capability and a low junction capacitance rating make it particularly suitable for protecting equipment that needs data line protection.

Typical applications for the PxxxxS4xLRP series SIDACtor protection thyristors include TV/camera CVBS cables, data communications, set top boxes (STBs), RS-485, RS-232 data lines and CAN bus.

For these applications, peak-to-peak signal voltage is within 1.1V and driver IC Vcc voltage is less than 5V, requiring a protection component with a voltage higher than 6V, explains Littelfuse. The PxxxxS4xLRP series devices meet this requirement and a junction capacitance of less than 30pF is suitable for 4.43MHz CVBS signals.

According to Littelfuse, the PxxxxS4xLRP series SIDACtor protection thyristor provides higher power density in a smaller footprint, than existing options, making it suitable for compact product designs. The compact surface-mount SOD-123FL package simplifies designing it into PCB layouts.​

The PxxxxS4xLRP Series SIDACtor protection thyristor is available in SOD-123FL packaging in tape and reel format. Samples can be requested through authorised Littelfuse distributors worldwide.

Littelfuse manufactures circuit protection, power control and sensing for automotive and commercial vehicles, industrial applications, data and telecommunications, medical devices, consumer electronics and appliances.

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