LT1105IN DIP-14 Offline Switching Regulator IC
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Prices updated: 13 Oct 2026
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About this product
An offline switching regulator IC in a 14-pin DIP package for high-input-voltage power supplies that use an external FET switch. Its flux-sensed design removes the need for an optocoupler, so only the transformer crosses the isolation barrier in flyback converters.
Specifications
- Type
- Offline switching regulator
- Package
- DIP-14
- Switch
- External FET
- Regulation
- ±1% line and load regulation
- Topology
- Flyback, transformer isolated
- Control
- Current mode
Frequently asked questions
Does the LT1105 need an optocoupler for feedback?
No. The listing says its magnetic flux-sensed design eliminates the optocoupler, which reduces the number of components crossing the isolation barrier to the transformer alone.
Can I use this IC directly on mains voltage?
Offline designs work with mains-level voltages, which are dangerous. Build them only with a full design, isolation and safety review, following the datasheet and an experienced engineer's guidance.
