CR0720SC

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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 2Ω 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

www.littelfuse.com CRxxxx series Specifications Electrical Charecteristics (Tj=25°C) SYMBOL PARAMETER SYMBOL PARAMETER VRM Stand-off Coltage I RM Stand-off Current VBR Breakdown Voltage I BO Breakover Current VBO Breakover Voltage I H Holding Current VT On-State Voltage THERMAL DATA VALUE UNIT T stg Storage and Operating Junction Temperature range -40 to +150 °C Tj 150 °C TL Maximum Temperature For Soldering 230 °C (For period of 10 seconds max) Stock Device Reverse Maximum Maximum Maximum Minimum Maximum Typical Number Code Stand-off Reverse Breakover Breakover Holding On-State Capacitance Voltage Leakage Voltage Current Current Voltage @1MHz 2v bias µA @Ibo mA mA @1A pF CR 0300 SA 030A 25 5 40 800 150 5 100 CR 0640 SA 064A 58 5 77 800 150 5 60 CR 0720 SA 072A 65 5 88 800 150 5 60 CR 0800 SA 080A 75 5 98 800 150 5 60 CR 1100 SA 110A 90 5 130 800 150 5 60 CR 1300 SA 130A 120 5 160 800 150 5 40 CR 1500 SA 150A 140 5 180 800 150 5 40 CR 1800 SA 180A 160 5 220 800 150 5 40 CR 2300 SA 230A 190 5 260 800 150 5 30 CR 2600 SA 260A 220 5 300 800 150 5 30 CR 3100 SA 310A 275 5 350 800 150 5 30 CR 3500 SA 350A 320 5 400 800 150 5 30 CR 0300 SB 030B 25 5 40 800 150 5 100 CR 0640 SB 064B 58 5 77 800 150 5 60 CR 0720 SB 072B 65 5 88 800 150 5 60 CR 0800 SB 080B 75 5 98 800 150 5 60 CR 1100 SB 110B 90 5 130 800 150 5 60 CR 1300 SB 130B 120 5 160 800 150 5 40 CR 1500 SB 150B 140 5 180 800 150 5 40 CR 1800 SB 180B 160 5 220 800 150 5 40 CR 2300 SB 230B 190 5 260 800 150 5 30 CR 2600 SB 260B 220 5 300 800 150 5 30 CR 3100 SB 310B 275 5 350 800 150 5 30 CR 3500 SB 350B 320 5 400 800 150 5 30 CR 0300 SC 030C 25 5 40 800 150 5 200 CR 0640 SC 064C 58 5 77 800 150 5 120 CR 0720 SC 072C 65 5 88 800 150 5 120 CR 0800 SC 080C 75 5 98 800 150 5 120 CR 1100 SC 110C 90 5 130 800 150 5 120 CR 1300 SC 130C 120 5 160 800 150 5 80 CR 1500 SC 150C 140 5 180 800 150 5 80 CR 1800 SC 180C 160 5 220 800 150 5 80 CR 2300 SC 230C 190 5 260 800 150 5 60 CR 2600 SC 260C 220 5 300 800 150 5 60 CR 3100 SC 310C 275 5 350 800 150 5 60 CR 3500 SC 350C 320 5 400 800 150 5 60 MAXIMUM RATINGS SUFFIX SA Ipp 10x160µs Amps 100 Ipp 10x560µs Amps 50 I TSM 60Hz Amps 20 DI/dt Amps/µs 500 MAXIMUM RATINGS SUFFIX SB Ipp 10x160µs Amps 150 Ipp 10x560µs Amps 100 I TSM 60Hz Amps 30 DI/dt Amps/µs 500 MAXIMUM RATINGS SUFFIX SC Ipp 2x10µs Amps 500 Ipp 10x160µs Amps 200 Ipp 10x560µs Amps 100 I TSM 60Hz Amps 60 dI/dt Amps/µs 500

www.littelfuse.com CRxxxx series CRXXXXSB CRXXXXSC CRXXXXSA 100 IPP - Percentage peak current - %IPP td = 1000µs tr tr = 1.25 x (t2 - t1) =10µs 41 3 t - Time - mSec PULSE WAVE FORM (10/10000 µS) 5 300200 100050403020 100 100 14 321 0 Surge Current Duration - full cycles @ 60HZ SINUSOIDAL Peak Current Surge (Non-Repetitive) CRXXXXSB CRXXXXSC CRXXXXSA On-State Current (RMS) - Amps PEAK SURGE ON-STATE CURRENT VS. SURGE CURRENT DURATION 10x160µs PULSE WAVE FORM Peak Value - Ipp TEST WAVEFORM PARAMETER tr = 10 sec td = 160 sec 10x160 Waveform t - Time - Sec Ipp - Peak Pulse Current - %Ipp Ipp - Peak Pulse Current - %Ipp t - Time - Sec Half Value = Ipp = td2 80 160 240 320 400 480 10x560µs PULSE WAVE FORM Peak Value - Ipp TEST WAVEFORM PARAMETER tr = 10 sec td = 560 sec 10x560 Waveform Half Value = Ipp = td2 28000 560 840 1,120 1,400 1,680