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October 10th, 2017 - Linear System's LSK389 and LSK489 Transistor Series

Linear Integrated Systems offers a popular line of ultra low noise monolithic dual N-channel JFET, the LSK389 series. JFETS provide extremely high resolution and enhance details making sound cleaner, clearer and more natural than the best bipolar transistors (like the LM394). It is widely believed that JFETS offer the best sound in audio circuits. JFETs are not only cost effective, they are readily available. Linear Integrated Systems also offers a low capacitance monolithic dual N-channel JFET, the LSK489. All of these products are offered in To-71, SOIC, and the LSK489 is also offered in SOT-23. These parts are expected to be available very soon in the tiny DQFN package.


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LSK389 Series LSK48912345 LSK489 Series



Download Datasheet (PDF) Download Datasheet (PDF)


Features to note: the LSK389 has lower noise than the LSK 489 and while the LSK489’s noise is nearly as low, it also has much lower typical gate to drain capacitance of just 4 pF, compared with 25pF for the LSK389. Although the noise difference between the two JFETS is not significant, the lower gate to drain capacitance can be important as the higher capacitance can cause intermodulation distortion in some designs. This lower capacitance results in a wider bandwidth front end for the audio op amp, while also reducing the IMD that the op amp will see.

For applications that strive to achieve the highest level of performance in one or two parameters, these JFETs can provide the flexibility in specification, configuration, topology and associated components needed to achieve these goals. If you are interested in more information on the LSK389 and LSK489 series, please contact our sales team at sales@trendsetter.com.






October 4th, 2017 - Min-E-Con: Pin vs. Twist Pin

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Connectors offer many options from material finish, to shell plating, hardware, and wire. One of those options is the contact and whether it is a twist pin or Min-e-con’s Fifty lock system, engineering’s preference dictates which contact is utilized. Trendsetter has been a distributor for Minecon for many years and has been working with our customers' engineering staffs to offer Minecon’s contact solution. Minecon has been among the leaders in the design and manufacture of high density micro-miniature connectors since 1974. They make Micro-D (MIL83513), Strips and Nano connectors (Mil 32139), as well as cable harnesses and custom solutions. The founders of Minecon spent their early years working at interconnect companies where they recognized the need for a different kind of contact system. At Minecon, they created and patented the Fifty Lock system, which is a pin and contact system consisting of a tubular machined contact mating with a recessed male pin that is protected in the cavity of the plastic insulator. Once mated, the compressed beams of the pin contact provide constant pressure which results in higher reliability.

Another contact solution is the twist pin, which was developed in the 60s and is licensed to many interconnect companies. The twist pin consists of several stranded cores that make up the wire bundle which is heat treated and has a weld performed at the tip of each contact. Crimp sleeves are then inserted over the contact and contact areas and the pin is recessed into the insulator with a rigid socket exposed thus reversing the traditional positions of the pin and socket.

After 20+ yrs of working with engineering to provide the solution that works best in their application, I have come to realize that for many of you, I am trying to convert you to a new belief system and supercede the contact preference that you have embraced for a long time and that has served you well.

I am interested to know which interconnect solution you prefer and what helps you “stay connected” and sleep better at night. Let me know?

Carol Williams
carolw@trendsetter.com