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The Semifuse is a resettable current fuse based on conductive polymer technology. Up to its rated "hold" current value, it will pass that current continuously with no other effect on the circuit its protecting. Should a high current or high voltage occur, the Semifuse will dramatically increase its resistance (the "PTC" effect) thus limiting the through current to safe levels. The Semifuse will remain in this "off" state until the applied voltage is removed and a suitable cooling down period has passed. The Semifuse then resets to its pre-fault level ready to protect again.
Semifuse re-settable fuses are available in a wide range of current values, voltages and formats. So whether you need a low-profile "strap" solution, through-hole p.c.b. mounting or an SMD design, Semifuse can supply them all.
Our basic SFP strap series offers continuous protection from 1.2A to 4.2A with voltages up to 24V. For higher current values our SFLR series can be used upto 10A/20V and also benefits from lower cold resistance values. For a more compact protector, our SFVT series offer higher current values (1.7A-2.4A) in a slimmer design. These are suitable for Li-Ion batteries and other space-critical applications.
SFP Strap Series
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SFLR Series
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SFVT Series
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The Semifuse SFR series offer a range of voltages from 16V to 60V in 3 series;
1) The SFR16P offers a compact disc with values up to 14A continuous.
2) The SFR30P provides general circuit protection up to 9A continuous.
3) The SFR60P provides general protection up to 3.75A continuous.
There is also a 60V rated SFR250 series (250V switching) version suitable for telecoms applications where mains and lightning surges have to be protected.
SFR16P
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SFR30P
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SFR60P
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SFR250
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Semifuse's SMD range is one of the most comprehensive available. From 0805 to 2920 footprints, Semifuse can offer compact circuit protection for currents from 0.1A to 3A with voltages upto 60V.
SMD Range
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These axial leaded strap devices provide reliable, non-cycling protection for rechargeable batteries. The nickel leads have narrow, low-profile profiles that are ideal for direct installation onto battery cells.
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The SFLR product series are designed to reduce the device's resistance at the same hold current rating. The smaller thermal mass of these devices also provide benefit of faster trip time and increase the battery safety level. The SFLR devices are ideally suited for battery packs used for portble computer and camcorder applications.
The SFVT product series features a slim, low profile and low resistance design. As such, these devices are ideal for direct installation onto Li-ion batteries—whether cylindrical or prismatic. The SFVT product offers protection against both overcurrent and overtemperature fault conditions.
The new Radial Leaded devices are designed to provide different products in the general applications with maximum 16 volts and a maximum 100-ampere short circuit rating.
These RLDs can be used to protect almost any load powered by a low voltage (≤30Vdc) supply, including general electronics, computers and their peripheral equipment, and automotive electronics.
These 60V RLDs were designed to be general-purpose resettable fuses. As such, they are capable of protecting a large variety of circuits, including power supplies, speakers, security and alarm systems, certain motors, etc.
This product line provides protection from induced AC power currents, direct power contact and natural lightning strikes. These devices range in hold currents from 0.08A to 0.18A, under a max operating voltage of 60Vdc and an interruption voltage of 250Vac. The SFR250 product line is widely used in the telecommunications and networking fields, and in ISDN and XSDN equipment. It also helps networking manufacturers pass the ITU K20, K21 and Telcordia requirements.
Semifuse SMD polymer PTCs provide a surface mount solution for the protection of sensitive electronic equipment. Please refer to the PDF file for information about the different sizes available.