TeleLink SM Fuse Advantages TeleLink® SM Fuse
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TeleLink SM Fuse Advantages
• The elimination of series line resistance enabling longer loop lengths
• Precise longitudinal balance allowing better transmission quality
• Robust surge performance which elimates costly down time due to nuisance blows
• Greater surge ratings than resettable devices ensuring regulatory compliance
• Non-degenerative performance
• Available in surface mount packaging which utilizes less PCB real estate, eliminates mixed technologies,
and reduces manufacturing costs
Selection Criteria
For circuits that do not require additional series resistance, the surge current rating (IPP) of the Tel eLi nk SM Fuse
should be greater than or equal to the surge currents associated with the lightning immunity tests of the applicable
regulatory requirement (IPK).
IPP ≥ IPK
For circuits that utilize additional series resistance, the surge current rating (IPP) of the TeleLink SM Fuse should
be greater than or equal to the available surge currents associated with the lightning immunity tests of the
applicable regulatory requirement (IPK (available)).
IPP ≥ IPK (available)
The maximum available surge current is calculated by dividing the peak surge voltage (VPK) by the total circuit
resistance (RTOTAL).
IPP ≥ IPK (available) = VPK/RTOTAL
For longitudinal surges (TIP-GND, RING-GND), RTOTAL is calculated for both TIP and RING.
RTOTAL = RTIP + RSOURCE
RTOTAL = RRING + RSOURCE
For metallic surges (TIP-RING):
RTOTAL = RTIP + RRING + RSOURCE
To select the most appropriate TeleLink SM Fuse / SIDACtor TVS combination, simply decide what regulatory
requirement your equipment will need to meet and refer to the following table. For applications that do not require
agency approval or multiple listings, please contact Teccor Electronics.
Regulatory Requirement TeleLink SM Fuse SIDACtor TVS
GR 1089 F1250T C Series
FCC Part 68, Type A F1250T B Series
FCC Part 68, Type B F0500T A Series
ITU K.20 F1250T A Series
ITU K.21 Basic/Enhanced F1250T A Series
UL 1950 All All
UL 1950 All All