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CR3100SC Datasheet(PDF) 1 Page - Littelfuse |
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CR3100SC Datasheet(HTML) 1 Page - Littelfuse |
1 / 3 page 52 www .littelfuse .com CRxxxx series Description The CR range of protectors are based on the proven technology of the T10 thyristor product. Designed for transient voltage protection of telecommunications equipment, it provides higher power handling than a conventional avalanche diode (TVS) and when compared to a GDT offers lower voltage clamping levels and infinite surge life. Packaged in a transfer molded DO-214AA surface mount outline designed for high speed pick & place machines used in today’s surface mount assembly lines. Electrical Charecteristics The electrical characteristics of a CRXXXX device is similar to that of a self gated Triac, but the CR is a two terminal device with no gate. The gate function is achieved by an internal current controlled mechanism. Like the T.T.S. diodes, the CRXXXX has a standoff voltage (Vrm) which should be equal to or greater than the operating voltage of the system to be protected. At this voltage (Vrm) the current consumption of the CRXXXX is negligible and will not effect the protected system. When a transient occurs, the voltage across the CRXXXX will increase until the breakdown voltage (Vbr) is reached. At this point the device will operate in a similar way to a T.V.S. device and is in an avalanche mode. The voltage of the transient will now be limited and will only increase by a few volts as the device diverts more current. As this transient current rises, a level of current through the device is reached (Ibo) which causes the device to switch to a fully conductive state such that the voltage across the device is now only a few volts (Vt). The voltage at which the device switches from the avalanche mode to the fully conductive state (Vt) is known as the Breakover Voltage (Vbo). When the device is in the Vt state, high currents can be deverted without damage to the CRXXXX due to the low voltage across the device, since the limiting factor in such devices is dissipated power (V x I). Resetting of the device to the non conducting state is controlled by the current flowing through the device. When the current falls below a certain value, known as the Holding Current (Ih), the device resets automatically. As with the avalanche T.V.S. device, if the CRXXXX is subjected to a surge current which is beyond its maximum rating, then the device will fail in short circuit mode, this ensures that the equipment is ultimately protected. Selecting A CRXXXX 1. When selecting a CRXXXX device, it is important that the Vrm of the device is equal to or greater than the operating voltage of the system. 2. The minimum Holding Current (Ih) must be greater than the current the system is capable of delivering otherwise the device will remain conducting following a transient condition. VBR MIN VRM VBO IRM IBO I VT H IT V-I Graph Illustrating Symbols and Terms for the CR Surge Protection Device. The CRXXXX Range Can Be Used to Protect Against Surges As Defined In The Following International Standards. SA SB SC FCC Rules Part 68/D Metallic 10/560µs 50A 100A 100A Longitudinal 10/160µs 100A 150A 200A Bellcore Specification TR-NWT-001089 10/1000µs 37A 75A 100A 2/10µs - - 500A 100v/µs 1KV 1KV 1KV ITU K-17 (Formerly CCITT) Voltage Wave Form 100/700µs - 1.5KV 1.5KV Current Wave Form 5/310µs - 38A 38A VDE 0433 Voltage Wave Form 10/700µs - 2KV 4.0KV Current Wave Form 5/310µs - 50A 100A C-NET 131-24 Voltage Wave From 0.5/700µs 1.0KV 1.0KV 4.0KV Current Wave Form 0.8/310µs 25A 25A 100A IEC 1000-4-5 (Discharge through 2 Ω impendance) I 8/20µs - 100A 250A Voltage Wave Form 1-2/50µs - 300V 500V ITU K-20 Voltage Wave Form 10/700µs 1000V 10000V 4000V (Formerly CCITT) Current Wave Form 5/310µs 25A 25A 100A |
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Similar Description - CR3100SC |
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