TISP4070M3AJ

NOTES: 1. See Applications Information and Figure 10 for voltage values at lower temperatures.
2. Initially, the TISP4xxxM3AJ must be in thermal equilibrium with TJ = 25 .
3. The surge may be repeated after the TISP4xxxM3AJ returns to its initial conditions.
4. See Applications Information and Figure 11 for current ratings at other temperatures.
5. EIA/JESD51-2 environment and EIA/JESD51-3 PCB with standard footprint dimensions connected with 5 A rated printed wiring track widths. See Figure 9 for the current ratings at other durations. Derate current values at -0.61 %/ for ambient  emperatures above 25 .

These devices TISP4xxxM3AJ are designed to limit overvoltages on the telephone line. Overvoltages are normally caused by a.c. power system or lightning flash disturbances which are induced or conducted on to the telephone line. A single device provides 2-point protection and is typically used for the protection of 2-wire telecommunication equipment (e.g. between the Ring and Tip wires for telephones and modems). Combinations of devices can be used for multi-point protection (e.g. 3-point
protection between Ring, Tip and Ground).

The protector TISP4xxxM3AJ consists of a symmetrical voltage-triggered bidirectional thyristor. 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.

The TISP4xxxM3AJ range consists of twenty voltage variants to meet various maximum system voltage levels (58 V to 320 V). They are guaranteed to voltage limit and withstand the listed international lightning surges in both polarities. These medium (M) current protection devices are in a plastic package SMAJ (JEDEC DO-214AC with J-bend leads) and supplied in embossed tape reel pack. For alternative voltage and holding current values, consult the factory. For higher rated impulse currents, the 100 A 10/1000 TISP4xxxH3BJ series in the SMB (JEDEC DO-214AA) package is available.