HHM1904C1

Balun Overview

The HHM1904C1 is a signal conditioning LTCC balun transformer manufactured by TDK Corporation. It operates within the 2.4 GHz to 2.5 GHz frequency range, designed for wireless applications. The component provides impedance transformation between unbalanced and balanced lines, specifically converting from 50 Ohms to 75 Ohms. It features an insertion loss of 0.8 dB maximum. The device utilizes a surface-mount (SMD/SMT) termination type and is housed in a compact 0402 (1005 metric) package. It supports board mounting and functions reliably within an operating temperature range of -40°C to +85°C.

Balun Feature Summary

• Provides impedance conversion between 50 Ohm unbalanced and 75 Ohm balanced transmission lines
• Utilizes Low-Temperature Co-fired Ceramic (LTCC) technology for stable RF performance
• Designed for high-frequency signal conditioning in the 2.4–2.5 GHz band

Balun Applications

• Wireless LAN (WLAN) systems
• Bluetooth module interfaces
• RFID reader antenna matching networks

Balun Procurement Notes

Verify current availability status as the product may be subject to discontinuation or limited supply conditions. Confirm that the required 0402 footprint matches the design layout. Ensure the 50/75 Ohm impedance specification aligns with the system architecture. Check for RoHS compliance documentation if environmental regulations apply. Validate the operating temperature range against the intended application environment.

Balun Selection Notes

Select this component when a transition from standard 50 Ohm RF traces to 75 Ohm balanced lines is required in space-constrained designs. The 0402 package size is suitable for high-density PCB layouts. Consider the specific insertion loss characteristics for signal integrity requirements. Verify compatibility with the target frequency band of 2.4–2.5 GHz. Ensure the surface-mount process capabilities match the manufacturing equipment.

Balun Part Context

This part belongs to the HHM series of baluns from TDK Corporation, which are specialized for RF signal conditioning. The series utilizes LTCC technology to achieve miniaturization and reliable performance in wireless communication devices. The HHM1904C1 specifically addresses the need for impedance matching between different transmission line standards in compact form factors.

Balun Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult official TDK channels for potential obsolescence management or alternative series recommendations.