Current Sensing

Low primary DC resistance. For use up to 1 MHz. Maximum part temperatures up to +165°C (ambient + temp rise).
Current transformers accurately sense and measure current flow in power supply circuits in a non-invasive way. Ideally, they shunt a very small sample of the current to measure while dissipating minimal energy. The sensed current information is typically used to prevent overcurrent conditions and to monitor and control circuits in power supplies and other powered applications. Current sensors are frequently used to measure and control the load current in power supplies, safety circuits and a variety of control circuits. In applications where controlling the current is required, such as in power supplies, accurately sensing the magnitude of the current is a fundamental requirement. Coilcraft manufactures wire-through-hole current sensors and SM current sense transformers for measuring current at frequencies from 50/60 Hz to greater than 1 MHz. 

Selecting the appropriate current sense transformer for your application begins by determining:
  1. The maximum current to be sensed
  2. The frequency of the current waveform to be sensed
  3. The duty cycle of the current waveform to be sensed
  4. The desired output voltage across your terminating resistor
Selection is greatly simplified with our Current Transformer Selector tool.  This online resource helps you quickly find the best current transformer for your application and includes behind-the-scenes flux density calculations to assure your selection is sized correctly.  Our Selecting Current Sensors and Transformers application note discusses the technology and applications of current transformers.

Product series

Product series Qualification Inductance Length (mm) Width (mm) Height (mm)
Which Version of These Parts Should You Use?
AE
Passes NASA Low Outgassing Specification
Extended Temperature Applications: -55 To 155°C Ambient
Leach Resistant Tin-Lead Terminations
33 µH 1800 µH 4.8 4.5 3.5
Which Version of These Parts Should You Use?
CP
Low Temperature Storage: As low as -55­°C Ambient
Extended Qualification
81 µH 3000 µH 8.13 8.0 5.3
Which Version of These Parts Should You Use?
ST
Low Temperature Storage: -55­°C Ambient
Extended Qualification
53 µH 2993 µH 7.0 5.2 3.0
Which Version of These Parts Should You Use?
ST
Low Temperature Storage: -55­°C Ambient
Extended Qualification
1700 µH 32 mH 12.2 10.6 11.0
Which Version of These Parts Should You Use?
ST
Low Temperature Storage: -55­°C Ambient
Extended Qualification
340 µH 34 mH 19.91 14.55 10.5
Which Version of These Parts Should You Use?
ST
Low Temperature Storage: -55­°C Ambient
Extended Qualification
3300 µH 12 mH 19.8 18.5 19.8