PMS9505.125NLT

Current Sense Transformers Overview

The PMS9505.125NLT is a surface-mount current sensing transformer from Pulse Electronics, designed for high-isolation automotive applications. It features an inductance of 11 mH and a turns ratio of 1:125. The device supports a primary rated current of 30 A with a maximum primary DC resistance of 500 µΩ and a secondary resistance of 4 Ω. Operating frequencies exceed 20 kHz. It provides enhanced insulation with a 3,000 V RMS isolation rating and a 6.5 mm creepage distance. The component is AEC-Q200 qualified, ensuring reliability in harsh environments. It operates within a temperature range of -40°C to +125°C and utilizes a molded construction for robustness.

Current Sense Transformers Feature Summary

• Enhanced insulation barrier between primary and secondary windings for safe cross-ground measurement
• High isolation voltage rating suitable for demanding automotive power electronics
• Molded core structure providing mechanical durability and consistent magnetic performance
• AEC-Q200 qualification ensuring compliance with automotive industry reliability standards

Current Sense Transformers Applications

• On-board chargers (OBC) in electric vehicles
• DC-DC converters in automotive systems
• High-current sensing across different ground layers
• Automotive power management circuits requiring galvanic isolation

Current Sense Transformers Procurement Notes

Verify the specific suffix NLT against the manufacturer's latest datasheet to confirm packaging configuration and tape-and-reel specifications. Ensure that the AEC-Q200 qualification status remains valid for the intended automotive application by checking recent product change notices. Confirm that the 30 A primary current rating aligns with the system's peak load requirements without exceeding thermal limits under worst-case operating conditions.

Current Sense Transformers Selection Notes

Select this component when high-voltage isolation is required between sensing and control circuits in automotive power stages. The 1:125 turns ratio determines the secondary signal amplitude relative to the primary current; verify compatibility with downstream ADC or amplifier input ranges. Consider the 11 mH inductance for frequency response characteristics above 20 kHz. Ensure PCB layout accommodates the physical dimensions and maintains adequate clearance for the 3,000 V RMS isolation requirement.

Current Sense Transformers Part Context

This part belongs to the PMS9505 series of high-isolation current sense transformers from Pulse Electronics. The series is engineered specifically for automotive applications where enhanced insulation is mandated by safety standards. Other variants in the series offer different turns ratios such as 1:50, 1:70, 1:100, and 1:180, allowing designers to tailor the sensing gain while maintaining consistent isolation and current handling capabilities across the family.

Current Sense Transformers Replacement Considerations

Direct replacements must match the 1:125 turns ratio, 11 mH inductance, and 30 A current rating. Verify that any substitute component also holds AEC-Q200 qualification and offers equivalent 3,000 V RMS isolation. Check physical footprint compatibility if space constraints are critical. Note that other series members like PMS9505.100NLT differ primarily in turns ratio and may not provide the same secondary output scaling.