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Product Detailed Parameters
- Description：XFMR FLYBACK DC/DC CONV 37UH SMD
- Series：WE-FB
- Mfr：Würth Elektronik
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：For DC/DC Converters
- Applications：Flyback Converters
- Intended Chipset：LT3573, LT3574, LT3575, LT3748
- Chipset Manufacturer：Linear Technology
- Voltage - Primary：37 ~ 57V
- Voltage - Auxiliary：12V @ 30mA
- Voltage - Isolation：1500Vrms
- Inductance @ Frequency：37µH @ 10kHz
- Frequency：250kHz
- Operating Temperature：-40°C ~ 130°C
- Mounting Type：Surface Mount
- Size / Dimension：-
- Height - Seated (Max)：0.505" (12.83mm)
- Footprint：0.530" L x 0.699" W (13.46mm x 17.75mm)
- Style：-
- Grade：-
- Qualification：-
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Overview
The Würth Elektronik 750311439 is a surface-mount flyback transformer designed for isolated DC/DC converter applications. It features a primary inductance of 37µH at 10kHz and operates at a frequency of 250kHz. The component provides 1500Vrms isolation voltage and includes an auxiliary winding rated at 12V @ 30mA. Designed for the WE-FB series, it supports switching regulators from Linear Technology, including LT3573, LT3574, LT3575, and LT3748. The package dimensions are 13.46mm x 17.75mm with a maximum height of 12.83mm, suitable for temperatures ranging from -40°C to 130°C.
Feature Summary
- Provides high-voltage isolation of 1500Vrms for safe signal and power transfer between circuits.
- Optimized specifically for integration with Linear Technology LT35xx and LT37xx series switching regulators.
- Includes a dedicated auxiliary winding to support controller biasing requirements in flyback topologies.
Applications
- Isolated DC/DC converter designs
- Sensor interface circuits requiring galvanic isolation
- Telecommunications equipment power supplies
Procurement Notes
Verify that the specific part number matches the required inductance and isolation ratings for your circuit design. Confirm compatibility with the intended Linear Technology controller chip, as this component is tailored for specific families like LT3573 or LT3748. Check the latest datasheet for any packaging updates or mechanical dimension changes indicated in recent Product Change Notices.
Selection Notes
Select this component when designing isolated power stages using LT35xx or LT37xx controllers. Ensure the application requires 37µH primary inductance and 250kHz operation. Verify that the 1500Vrms isolation rating meets safety standards for the target environment. Consider the SMD footprint and height constraints during PCB layout planning.
Part Context
This transformer belongs to the WE-FB series by Würth Elektronik, which focuses on flyback solutions for SMPS applications. It is distinct from other WE-FB variants by its specific pinout and electrical characteristics optimized for Linear Technology ICs. The series generally targets compact, high-efficiency isolated power conversion needs in industrial and telecom sectors.
Replacement Considerations
Direct substitutes include other Würth Elektronik WE-FB transformers designed for the same LT35xx/LT37xx controllers, such as 750311889, provided electrical parameters match the design requirements. Cross-referencing with manufacturer-specific application notes is recommended before substitution.
