HHM1521

Balun Overview

The TDK HHM1521 is a surface-mount RF balun transformer designed for the 2.4GHz to 2.5GHz frequency range. It features an impedance configuration of 50 ohms unbalanced to 200 ohms balanced. The component exhibits a maximum insertion loss of 1.0dB and a minimum return loss of 10dB, with a phase difference of 180° ±10°. Housed in a compact 0805 (2012 Metric) package, it complies with RoHS3 standards and has a Moisture Sensitivity Level of 1.

Balun Feature Summary

• Provides conversion between unbalanced and balanced RF signals within the specified ISM band.
• Designed for high-performance signal integrity with controlled phase difference and low insertion loss.
• Utilizes a standard 0805 surface-mount footprint for automated assembly compatibility.

Balun Applications

• Wireless LAN modules operating at 2.4GHz
• Bluetooth transceiver circuits
• Zigbee and other short-range wireless connectivity devices

Balun Procurement Notes

Verify current availability as this part was officially declared End-of-Life on June 3, 2022. Sourcing should focus on surplus stock or authorized distributors holding remaining inventory. Confirm that the specific revision matches design requirements before integration, as obsolescence may limit long-term supply chain stability.

Balun Selection Notes

Select this component only if the 2.4GHz-2.5GHz band and 50/200 ohm impedance transformation align precisely with circuit topology. Consider the 0805 package size constraints and thermal characteristics during layout. Evaluate alternative components from other manufacturers if long-term production viability is required for new designs.

Balun Part Context

The HHM1521 belongs to TDK's HHM series of RF baluns, which are engineered for wireless communication applications. This specific model targets the industrial, scientific, and medical (ISM) radio bands. It serves as a passive matching network element essential for interfacing single-ended RF sources with differential antenna loads.

Balun Replacement Considerations

The Johanson Technology Inc. part number 2450BL15B0200001E is documented as a similar substitute. Verify electrical parameter equivalence and physical footprint compatibility before substitution.