CR0640SC

CR0640SC Datasheet

Part	Datasheet
CR0640SC	CR0640SC (pdf)

Related Parts	Information
CR0300SA	CR0300SA
CR0720SA	CR0720SA
CR1500SB	CR1500SB
CR1500SC	CR1500SC
CR2300SA	CR2300SA
CR2300SB	CR2300SB
CR2600SC	CR2600SC
CR2600SB	CR2600SB
CR2300SC	CR2300SC
CR3500SA	CR3500SA
CR2600SA	CR2600SA
CR3100SB	CR3100SB
CR0720SB	CR0720SB
CR3100SC	CR3100SC
CR0640SB	CR0640SB
CR0640SA	CR0640SA
CR0300SC	CR0300SC
CR3500SB	CR3500SB
CR0300SB	CR0300SB
CR3500SC	CR3500SC
CR3100SA	CR3100SA
CR1500SA	CR1500SA
CR0720SC	CR0720SC
CR0900SA	CR0900SA
CR1800SA	CR1800SA
CR1800SC	CR1800SC
CR1300SC	CR1300SC
CR1300SB	CR1300SB
CR1300SA	CR1300SA
CR1100SC	CR1100SC
CR1100SB	CR1100SB
CR1100SA	CR1100SA
CR0900SC	CR0900SC
CR0900SB	CR0900SB
CR1800SB	CR1800SB

PDF Datasheet Preview
CRxxxx series 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 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. 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. IT IH VT IRM VBR VRM VBO 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. FCC Rules Part 68/D Metallic Longitudinal 10/560µs 10/160µs 50A 100A 100A 150A 100A 200A Bellcore Specification TR-NWT-001089 10/1000µs 2/10µs 100v/µs 100A 500A ITU K-17 Formerly CCITT Voltage Wave Form Current Wave Form 100/700µs 5/310µs 1.5KV 38A 1.5KV 38A VDE 0433 Voltage Wave Form Current Wave Form 10/700µs 5/310µs 4.0KV 100A C-NET 131-24

PDF Datasheet Preview

CRxxxx series

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 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. 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.

IT IH

VT IRM

VBR VRM VBO

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.

FCC Rules Part 68/D

Metallic Longitudinal
10/560µs 10/160µs
50A 100A
100A 150A
100A 200A

Bellcore Specification

TR-NWT-001089
10/1000µs
2/10µs
100v/µs
100A
500A

ITU K-17 Formerly CCITT

Voltage Wave Form Current Wave Form
100/700µs
5/310µs
1.5KV 38A
1.5KV 38A

VDE 0433

Voltage Wave Form Current Wave Form
10/700µs
5/310µs
4.0KV
100A

C-NET 131-24

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Datasheet ID: CR0640SC 646442