FB120 LITTELFUSE | Alldatasheet
Document overview
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Technical content
304 www.littelfuse.com Silicon Avalanche Diodes Axial Leaded Telecommunications Transient Voltage Suppressors FOLDBAK™ SERIES Designed to protect sensitive telecommunications electronics from transients which originate from induced lightning, power cross and inductive load switching etc., especially where breakover devices would cause nuisance latch-up. Typical equipment would be: line cards, PABX, modems, multiplexers and NTDs.
FEATURES
- Foldback characteristics
- 2200 watts Peak Power rated with 10/1000µS pulse
- 30,000 watts Peak Pulse Power based on 8/20µS
- UL 94V-0 flammability classification
DESCRIPTION
The foldback characteristic of this device eliminates the clamping of the DC current, or the battery, used in telecom systems, so latch-up is eliminated. Latch-up can occur with breakover devices due to the conduction follow-on current supplied by the DC system, after the device has responded to a transient. With breakover devices, latch-up will happen more readily as the ambient temperature rises because the holding current values will fall with rising temperature. The Foldbak eliminates this problem while still providing high levels of protection. Min 25.4 4.826 5.207 Min 25.4 9.155 9.527 0.966 - 1.066 V-I Characteristic ABSOLUTE MAXIMUM RATINGS @25˚C case temp (unless otherwise noted) SYMBOL PPP PM (AV) Tj T stg PARAMETER Peak Pulse Current 10x1000µsec 8-20µsec Steady state power dissipation, lead length 9.5mm, TL - 85˚C (note 1) Junction temperature Storage temperature VALUE 2,200 20,000 5.0 -55 to 150 -55 to 150 Units W W W Note 1. Mounted on copper pad area 40mm square Characteristics @25˚C case temp (unless otherwise noted) Note 2. Using 10/1000µS pulse DEVICE TYPE FB120 FB160 Working voltage (Vr) volts 120 160 Maximum breakover Voltage (Vbo) volts 170 220 Maximum leakage current (Ir) @ Vr µA 1.0 1.0 Minimum foldback voltage Vfb volts 110 Maximum Peak Pulse Current (lpp) @ Vcl Note 2 amps 170 220 Ipp Irm Vfb Vrm Vbo Ibo All dimensions in mm