DESCRIPTION
These dual bidirectional thyristor devices protect central office, access and customer premise equipment against overvoltages on the telecom line. These protectors have been specified mindful of the following standards and recommendations: GR-1089-CORE, TIA/EIA-IS-968, UL 60950, EN 60950, IEC 60950, ITU-T K.20, K.21 and K.45. The TISP3350T3BJ meets the FCC Part 68 “B” ringer voltage requirement (VDRM = ±275 V). Housed in a 3-pin modified SMB (DO-214AA) package, the TISP3xxxT3BJ range is space efficient solution for protection designs of 80 A or less which use multiple SMBs. These devices allow signal voltages, without clipping, up to the maximum off-state voltage value, VDRM, see Figure 1. Voltages above VDRM are limited and will not exceed the breakover voltage, V(BO), level. If sufficient current flows due to the overvoltage, the device switches into a low-voltage on-state condition, which diverts the current from the overvoltage through the device. When the diverted current falls below the holding current, IH, level the device switches off and restores normal system operation.
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