Bourns' TISP4500H3BJ is a single bidirectional overvoltage protector developed for transformer-coupled xDSL applications.
It can be used as a 2-wire (A-B) protector, or as one element in a 3-wire (A-B-C) protector scheme. The main advantage of the TISP4500H3BJ is non-conduction under ITU-T power contact tests while still allowing the use of conventional capacitors for line-side interwinding coupling.
The 350 V, 0 to 70°C rated working voltage means no conduction under the 230 V rms (325,2 Vpk) testing, and the 500 V protection voltage (V(BO)) protects the interwinding capacitor under lightning tests. Power induction tests will cause conduction of the TISP4500H3BJ. The current and duration of the ITU-T induction test conditions (600 V rms ~1 A/s and 450 V rms -1500 V rms up to ~7,5 A for up to 2 s) is sustainable by a TISP4500H3BJ, however, additional components may be required to fully comply with ITU-T recommendations.
The TISP4500H3BJ enables designers to develop protection schemes that fully comply with ITU-T enhanced level testing, while removing the need for unwanted signal attenuating components previously associated with current limiting under AC power contact testing. The protection scheme now only has to comprehend primary protector coordination (if used), and induction test current. The device is rated for up to 200 A 10/700 and is able to provide protection under ITU-T recommendation K.21 enhanced test level (6 kV).
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