T1-1-KK81+

Balun Overview

The T1-1-KK81+ is a 1:1 core and wire transformer manufactured by Mini-Circuits, designed for RF signal conditioning applications. It operates within a frequency range of 0.15 MHz to 400 MHz with a characteristic impedance of 50 ohms. The component utilizes an SMD/SMT termination type and is housed in the KK81 case style. It supports operation temperatures from -20°C to +85°C and carries a power rating of 250 mW with a current rating of 30 mA. Packaging options include cut tape, reel, and MouseReel formats.

Balun Feature Summary

• Provides balanced-to-balanced or unbalanced-to-unbalanced signal transformation with a 1:1 ratio.
• Operates effectively across a wide bandwidth from 0.15 MHz to 400 MHz.
• Features a compact surface-mount design suitable for automated assembly processes.

Balun Applications

• RF signal path impedance matching
• Balun applications in communication systems
• Signal conditioning in test and measurement equipment

Balun Procurement Notes

Verify the specific suffix (+) indicates lead-free compliance per RoHS standards. Confirm the package variant matches the required reel or cut-tape quantity for production lines. Ensure the operating temperature range aligns with the environmental conditions of the final assembly. Cross-reference the datasheet for precise S-parameter performance at target frequencies.

Balun Selection Notes

Select this component when a 50-ohm impedance match is required between 0.15 MHz and 400 MHz. Consider the physical dimensions of the KK81 package for PCB layout constraints. Evaluate the 250 mW power handling capability against the expected signal levels in the circuit. Compare against higher-frequency variants if the application extends beyond 400 MHz.

Balun Part Context

This part belongs to the T1 series of audio and signal transformers from Mini-Circuits. It is categorized under RF transformers and is distinct from other series like T1-1T or T1-6 which offer different frequency ranges. The KK81 case style defines its physical footprint and pin configuration for surface-mount integration.

Balun Replacement Considerations

Direct substitutes include T1-1-X65+ for alternative packaging or T1-1T-KK81+ for extended low-frequency response down to 0.08 MHz. Verify electrical compatibility before swapping, as frequency ranges and package styles differ between these variants.