TISP7xxxH3SL Overview
This TISP® device series protects central office, access and customer premise equipment against overvoltages on the telecom line. The TISP7xxxH3SL has the same symmetrical bidirectional protection on any terminal pair; R-T, R-G and T-G. In addition, the device is rated for simultaneous R-G and T-G impulse conditions. The TISP7xxxH3SL is available in a wide range of voltages and has a high current capability, allowing minimal series resistance to be used. These protectors have been specified mindful of the following standards and recommendations: GR-1089-CORE, FCC Part 68, UL1950, EN 60950, IEC 60950, ITU-T K.20, K.21 and K.45. The TISP7350H3SL meets the FCC Part 68 “B” ringer voltage requirement and survives both Type A and B impulse tests. These devices are housed in a through-hole 3-pin single-in-line (SL) plastic package.

Description
The TISP7xxxH3SL limits overvoltages between the telephone line Ring and Tip conductors and Ground. Overvoltages are normally caused by a.c. power system or lightning flash disturbances which are induced or conducted on to the telephone line.
Each terminal pair, T-G, R-G and T-R, has a symmetrical voltage-triggered bidirectional thyristor protection characteristic. Overvoltages are initially clipped by breakdown clamping until the voltage rises to the breakover level, which causes the device to crowbar into a low-voltage on state. This low-voltage on state causes the current resulting from the overvoltage to be safely diverted through the device. The high crowbar holding current prevents d.c. latchup as the diverted current subsides.
This TISP7xxxH3SL range consists of fifteen voltage variants to meet various maximum system voltage levels (58 V to 300 V). They are guaranteed to voltage limit and withstand the listed international lightning surges in both polarities. These high current protection devices are in a 3-pin single-in-line (SL) plastic package and are supplied in tube pack. For alternative impulse rating, voltage and holding current values in SL packaged protectors, consult the factory. For lower rated impulse currents in the SL package, the 45 A 10/1000 TISP7xxxF3SL series is available.
These monolithic protection devices are fabricated in ion-implanted planar structures to ensure precise and matched breakover control and are virtually transparent to the system in normal operation.

   ITU-T K.20/21 Rating . . . . . . . . 8 kV 10/700, 200 A 5/310
   Ion-Implanted Breakdown Region
   Precise and Stable Voltage
   Low Voltage Overshoot under Surge
   Rated for International Surge Wave Shapes
      - Single and Simultaneous Impulses
   3-Pin Through-Hole Packaging
      - Compatible with TO-220AB pin-out
      -Low Height .................................................................... 8.3 mm
      Low Differential Capacitance ....................................... < 72 pF
      .............................................. UL Recognized Component