T4-1-KK81+ footprint, schematic symbol and 3D model by Mini-Circuits

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PCB Footprints

T4-1-KK81+ - Mini-Circuits PCB footprint - Other - Other - KK81_2025

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Datasheet Download Datasheet
Stock & Prices Price & Stock for T4-1-KK81+
Part Number T4-1-KK81+
Manufacturer Mini-Circuits
Pin Count 6
Part Category Transformer
Package Category Other
Footprint Name Other - KK81_2025
Released Date Aug 17, 2025
Last Modified Date Sep 3, 2025 9:43 PM UTC
Pinout / Pin List Click Here (Member Only)

T4-1-KK81+ Details

Manufacturer Part Number:
T4-1-KK81+
Pbfree Code:
Yes
Rohs Code:
Yes
Part Life Cycle Code:
Active
ECCN Code:
EAR99
Manufacturer:
Mini-Circuits
YTEOL:
5.5
Additional Feature:
OHMS RATIO IS 4
Application:
MATCHING
Cut-off Frequency-Max:
350 MHz
Cut-off Frequency-Min:
0.2 MHz
DC Unbalance Current-Max:
30 mA
Height:
5.84 mm
Insertion Loss:
3 dB
Length:
7.62 mm
Mounting Feature:
SURFACE MOUNT
Number of Primary Winding:
1
Number of Secondary Winding:
1
Operating Frequency-Max:
350000 kHz
Operating Frequency-Min:
200 kHz
Operating Temperature-Max:
85 °C
Operating Temperature-Min:
-20 °C
Power Rating:
0.25 W
Surface Mount:
YES
Transformer Type:
RF TRANSFORMER
Width:
6.86 mm

T4-1-KK81+ Frequently Asked Questions (FAQs)

Mini-Circuits provides a recommended PCB layout and footprint in their application notes, which can be found on their website. It's essential to follow these guidelines to ensure optimal performance and minimize parasitic effects.
The T4-1-KK81+ has a nominal impedance of 50 ohms. To impedance match, use a pi-network or a T-network topology with resistors and capacitors. You can use online impedance matching tools or consult with a RF design expert to determine the optimal matching network.
The maximum power handling of the T4-1-KK81+ is not explicitly stated in the datasheet. However, as a general rule, Mini-Circuits recommends derating the power handling by 1 dB for every 10°C increase in temperature above 25°C. It's essential to consult with a Mini-Circuits application engineer or perform thermal simulations to determine the maximum power handling for your specific application.
The T4-1-KK81+ is a commercial-grade component, and its reliability and performance may not meet the requirements of high-reliability or space-grade applications. Mini-Circuits offers specialized components for these applications, which undergo additional screening and testing. Consult with a Mini-Circuits application engineer to determine the best component for your specific requirements.
Common issues with the T4-1-KK81+ can be caused by improper PCB layout, poor soldering, or incorrect impedance matching. Consult the Mini-Circuits application notes and troubleshooting guides, which provide detailed steps for identifying and resolving common issues. You can also contact Mini-Circuits' technical support for assistance.

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T4-1-KK81+ Overview

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About Mini-Circuits

Mini-Circuits is a global leader in the design, manufacturing, and distribution of RF and microwave components and systems. The company's product portfolio includes a vast array of components such as amplifiers, mixers, splitters, couplers, filters, switches, and attenuators, among others. These components cover frequency ranges from DC to 65 GHz and beyond, serving applications in wireless communication, satellite communication, radar systems, test and measurement equipment, medical devices, and more.

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