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749251125 is listed in the Current Sense Transformers range at ChipApex. The manufacturer field lists Würth Elektronik. Its product description is CURR SENSE XFMR 1:125 10A SMD. Review the specifications below when checking this part for your BOM.
Current Sense Transformers specifications for 749251125
- Description：CURR SENSE XFMR 1:125 10A SMD
- Series：WE-CST
- Mfr：Würth Elektronik
- Package：Tape & Reel (TR),Cut Tape (CT)
- Frequency Range：-
- Type：Invasive
- Inductance：3 mH
- ET (Volt-Time)：68VµS
- Current Ratio：-
- DC Resistance (DCR)：6mOhm Primary, 6.5Ohm Secondary
- Ratings：-
- Mounting Type：Surface Mount
- Size / Dimension：0.303" L x 0.272" W (7.70mm x 6.90mm)
- Height - Seated (Max)：0.210" (5.33mm)
- Termination Style：Gull Wing
- Turns Ratio - Primary:Secondary：0.128472222
- Current Rating (Amps)：-
Current Sense Transformers datasheet and documents for 749251125
Current Sense Transformers Overview
The Würth Elektronik 749251125 is a surface-mount current-sense transformer from the WE-CST series, designed for AC current detection and switch-mode power supplies. It features a 1:125 turns ratio and supports up to 20A primary current. Key electrical parameters include a maximum inductance of 3 mH, a primary DC resistance of 0.75 mΩ, and a secondary DC resistance of 6.5 Ω. The device operates within a temperature range of -40°C to +125°C and has a maximum height of 5.33 mm.
Current Sense Transformers Feature Summary
- Provides galvanic isolation between primary and secondary circuits for accurate current monitoring.
- Engineered specifically for integration into switch-mode power supply architectures.
- Supports high primary current handling capabilities suitable for demanding applications.
Current Sense Transformers Applications
- AC current detection systems
- Switch-mode power supply (SMPS) designs
- Current sensing feedback loops
Current Sense Transformers Procurement Notes
Verify that the specific part number matches the required 1:125 turns ratio and 3 mH inductance specifications for your design. Confirm that the PCB footprint accommodates the component's dimensions and that the thermal environment remains within the -40°C to +125°C operating range during operation.
Current Sense Transformers Selection Notes
Select this component when a high-current surface-mount solution is needed for isolated current sensing. Ensure the application requires a 1:125 ratio and can accommodate the specified primary and secondary resistances. Verify compatibility with the target switching frequency and peak current requirements of the power supply topology.
Current Sense Transformers Part Context
This component belongs to the WE-CST series of current-sense transformers manufactured by Würth Elektronik. These devices are engineered for board-mount applications requiring reliable isolation and precise current measurement in compact form factors suitable for modern electronic assemblies.
Current Sense Transformers Replacement Considerations
No public confirmed substitute part numbers are available in the provided documentation. Consult official manufacturer resources for cross-reference information if alternative sourcing is required.
Current Sense Transformers FAQ
What is the maximum primary current rating for the 749251125?
The maximum primary current rating is 20 A.
What is the turns ratio of this current-sense transformer?
The turns ratio is 1:125.
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