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TISP4350L3 Datasheet(PDF) 1 Page - Bourns Electronic Solutions |
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TISP4350L3 Datasheet(HTML) 1 Page - Bourns Electronic Solutions |
1 / 6 page JULY 2000 - REVISED FEBRUARY 2005 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications. TISP4xx0L3LM Overvoltage Protector Series TISP4070L3LM, TISP4350L3LM BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS How To Order LM Package (Top View) Ion-Implanted Breakdown Region Precise and Stable Voltage Low Voltage Overshoot under Surge Device Symbol These devices 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 to 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 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.These protectors are guaranteed to voltage limit and withstand the listed lightning surges in both polarities. After a Type A surge (200 A, 10/160, and 100 A, 10/560) the equipment is allowed to be non-operational or operational. For an operational pass, series resistance must be added to reduce the Type A currents to within the TISP4xxxL3LM ratings (50 A, 10/160 and 30 A, 10/560). Alternatively, a series fuse with an I2t greater than 0.45 A2s and less than 5.6 A2s could be used to give a non-operational pass. After a Type B surge the equipment must be operational. As the TISP4xxxL3LM has a current rating of 40 A, will survive both Type B surges, metallic (25 A, 9/720) and longitudinal (37.5 A, 9/720), giving an operational pass to Type B surges. For metallic protection, the TISP4350L3LM is connected between the Ring and Tip conductors. For longitudinal protection two TISP4350L3LM protectors are used; one between the Ring conductor to ground and the other between the Tip conductor to ground. The FCC Part 68 B type ringer has voltages of 56.5 V d.c. and up to 150 V rms a.c., giving a peak voltage of 269 V. The TISP4350L3LM will not clip the B type ringing voltage as it has a high impedance up to 275 V. The TISP4070L3LM should be connected after the hook switch to protect the following electronics. As the TISP4070L3LM has a high impedance up to 58 V, it will switch off after a surge and not be triggered by the normal exchange battery voltage. Description Device VDRM V V(BO) V ‘4070 58 70 ‘4350 275 350 Ring-Tip Protection ............................................ TISP4350L3LM Electronics Protection ....................................... TISP4070L3LM Rated for UL 1950, ITU-T and TIA/EIA-IS-968 Surge Type Standard Wave Shape ITSP A A TIA/EIA-IS-968 (formerly FCC Part 68) 10/160 50 10/560 30 B TIA/EIA-IS-968 UL 1950/ ITU-T K.21 9/720 10/700 40 NC - No internal connection on pin 2 NC T(A) R(B) MD4XATA 1 2 3 T R SD4XAA Terminals T and R correspond to the alternative line designators of A and B *RoHS Directive 2002/95/EC Jan 27 2003 including Annex Device Package Type Carrier Quantity TISP4070L3 LM (Straight Lead DO-92) Bulk Pack 2000 TISP4070L3LM TISP4350L3 LM (Straight Lead DO-92) Bulk Pack 2000 TISP4350L3LM TISP4070L3LM-S TISP4350L3LM-S For Standard Termination Finish Order As For Lead Free Termination Finish Order As |
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