HHM1749S1

Balun Overview

The HHM1749S1 is a surface-mount RF balun manufactured by TDK Corporation, designed for high-frequency signal conversion. It operates within a frequency range of 1.71GHz to 1.99GHz, making it suitable for wireless communication applications. The component features a 50-ohm unbalanced port and a 100-ohm balanced port, providing impedance transformation between differential and single-ended lines. Key electrical specifications include a maximum insertion loss of 1.1dB and a minimum return loss of -10dB at the unbalanced port. The phase difference is specified as 180° ±10°. The device is housed in a compact 0603 (1608 metric) package with six printed circuit board pads, facilitating automated assembly in space-constrained designs.

Balun Feature Summary

• Converts single-ended signals to differential signals within the specified RF frequency band
• Provides impedance matching between 50-ohm and 100-ohm transmission lines
• Maintains precise 180-degree phase relationship between output ports
• Utilizes a compact surface-mount footprint for dense PCB layouts

Balun Applications

• Wireless local area network (WLAN) transceivers
• Bluetooth module interfaces
• 4G/5G mobile device front-end circuits

Balun Procurement Notes

Verify component authenticity through authorized distributors due to end-of-life status. Confirm lot traceability and RoHS compliance documentation prior to integration. Check for alternative sources if original manufacturing supply is unavailable. Ensure storage conditions meet moisture sensitivity level requirements. Validate pin compatibility during replacement planning.

Balun Selection Notes

Select this component when operating frequencies fall strictly between 1.71GHz and 1.99GHz. Consider the 0603 package size for spatial constraints. Evaluate insertion loss and return loss tolerances against system link budget requirements. Ensure the 50/100 ohm impedance ratio matches the circuit design. Verify thermal management capabilities for the specific application environment.

Balun Part Context

This balun belongs to TDK's HHM series of radio frequency components. The series focuses on miniaturized solutions for modern wireless devices. The HHM1749S1 specifically targets higher frequency bands compared to other series variants. It represents a specialized passive component for signal integrity in high-speed digital and RF systems.

Balun Replacement Considerations

The manufacturer recommends HHM1927A4 as an alternative part number. Verify functional equivalence and pinout compatibility before substitution. Assess performance differences in frequency response and impedance characteristics.