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| 33 | Basic TCS ™ HSP Device Operation The Bourns ® TCS ™ DL Series High-Speed Protector (HSP) products contain dual, well-matched, low resistance, bidirectional, very high-speed Transient Current Suppressors. By limiting the maximum current to a safe level, a Bourns TCS DL device offers superior protection for very high data rate differential lines against faults caused by momentary short circuits, induction and lightning surges. A TCS device is designed to trigger at a specified current level and provide a moderate amount of foldback. The following graph shows the normalized response of the device. Basic TBU ® HSP Device Operation Bourns TBU ® High-Speed Protectors (HSPs) are circuit protection devices constructed using MOSFET semiconductor technology. When placed in series with a signal line, the TBU HSP monitors the current flowing through the line. If the current exceeds a preset level, the TBU HSP triggers, providing an effective barrier to high voltages and currents. The TBU HSP begins protecting in less than 1μs, once line current exceeds the TBU device's trigger current Itrigger. When in the protected state, the TBU HSP restricts line current to less than 1mA typically, and blocks voltages up to the maximum voltage rating of the device. At the end of a surge event, the TBU HSP will begin the reset process when the voltage across the device drops below the Vreset level and will complete the reset process when the signal line returns to its normal operating range. If the line has a normal DC bias above Vreset, the voltage across the TBU HSP may not fall below V reset after the surge. In such cases, special care needs to be taken to ensure that the TBU HSP will reset. TCS ™ and TBU ® High-Speed Protectors Example TBU ® HSP VI Curve (TBU-CA050-300-WH) Key Features: • 50ns response time • Low let-through energy • Low series resistance • Low insertion loss Key Benefits: • Creates ideal diode response to maximize protection • Supports applications up to a frequency of 6GHz • Negligible impact on differential signal balance • Improves product reliability compared to standalone OVP TCS ™ Device - VI Curve Key Features: • Triggers at a specified current • Can block voltages up to 850V, enabling easy coordination • Provides superior protection in less than 1µs • Does not add capacitance to the signal line Key Benefits: • AEC-Q101 compliant* ("Q" part number suffix) • High-speed performance • Blocks voltages and currents • Extremely low let-through energy