Thyristor TSPD 66V 4.3A 8-Pin SOIC T/R

These dual forward-conducting unidirectional over-voltage protectors are designed for the overvoltage protection of ICs used for the SLIC (Subscriber Line Interface Circuit) function. The IC line driver section is typically powered with 0 V and a negative supply. The device limits voltages that exceed these supply rails and is offered in two voltage variants to match typical negative supply voltage values.High voltages can occur on the line as a result of exposure to lightning strikes and a.c. power surges. Negative transients are initially limited by breakdown clamping until the voltage rises to the breakover level, which causes the device to crowbar. The high crowbar holding current prevents d.c. latchup as the current subsides. Positive transients are limited by diode forward conduction.

• Ion-Implanted Breakdown Region
• Precise and Stable Voltage
• Low Voltage Overshoot under Surge
• Planar Passivated Junctions
• Low Off-State Current <10uA
• Rated for International Surge Wave Shapes
• UL Recognized Component