FIS121NL

Current Sense Transformers Overview

The FIS121NL is a through-hole current sense transformer from Pulse Electronics, designed for non-invasive solid-core applications. It features an inductance of 94.5 mH and a secondary DC resistance of 4.5 ohms maximum. The component operates with a turns ratio of 1:200 and supports a maximum frequency range of 200 kHz. Its physical dimensions are 15 mm in length, 12.5 mm in width, and 12 mm in height.

Current Sense Transformers Feature Summary

• Non-invasive solid-core design for direct wire insertion
• High inductance value for stable feedback signal generation
• Through-hole mounting style for robust board integration

Current Sense Transformers Applications

• Switching power supply current sensing
• Power factor correction circuits
• Feedback elements in isolated converters

Current Sense Transformers Procurement Notes

Verify the specific package type upon ordering, as distributors may list tape-and-reel or cut-tape options. Confirm the manufacturer lead time, which can extend to twenty weeks. Ensure the voltage-time product rating of 700 Vµs meets your circuit requirements before finalizing procurement.

Current Sense Transformers Selection Notes

Select this component when a high inductance of 94.5 mH is required for low-frequency current sensing up to 200 kHz. The 1:200 turns ratio suits applications needing significant signal attenuation. Ensure the PCB layout accommodates the through-hole footprint and the 15 mm length constraint.

Current Sense Transformers Part Context

This part belongs to the FIS series of current sense transformers by Pulse Electronics. These components are engineered to provide accurate current feedback in power electronics. The series offers various inductance values to match different switching frequencies and sensitivity requirements.

Current Sense Transformers Replacement Considerations

The FIS125NL is a related model within the same series but differs significantly in inductance (76 mH) and frequency range (500 kHz). Verify if the higher frequency capability and lower inductance of the substitute meet the specific circuit design constraints.