Film and Foil Organic Dielectric Capacitors PP & PC

Posted by Tomáš Zedníček
On October 26, 2020
0

Introduction Polypropylene (PP) is from a molecular point of view a non-polar dielectric with small losses and a relatively straight and moderate TC. Since the smallest film thickness is approx. 3.5 μm (0.14 mils) and εr ≈ 2.3 the capacitor can not come down to those sizes characterizing

EEE Components, PASSIVES

Film/Foil Organic Dielectric Capacitors PS,PPS,PTFE,PSU

Posted by Tomáš Zedníček
On October 26, 2020
0

Polystyrene (PS) represents a non-polar dielectric material that just as polycarbonate to a great extent has been replaced by polypropylene. The availability is strongly limited due to ceased production. Polyphenylene Sulfide or simply PPS has come to stay mainly because of its relatively high-temperature resistance which has allowed SMD manufacture.

ABC of CLR, EEE Components, PASSIVES, PHYSICAL, MECHANICAL & ASSEMBLY, TESTING

Mounting Guidelines: Soldering, PCB Handling & Rework

Posted by Tomáš Zedníček
On October 18, 2020
1

What are the optimum soldering conditions and solder fillet? The best solder fillet for all SMT applications is one which makes a reliable connection and which best withstands the environmental exposures of the products with minimum degradation. This fillet is difficult to describe quantitatively for all parts. The optimum fillet ranges in height from about 1/3 to 2/3 of the part termination height. This does not mean that all solder joints outside of this range should be repaired. It does mean that this is the target for the process engineer to reach for in his process. As many as possible of the solder fillets on the board should be in this range.

ABC of CLR, EEE Components, PASSIVES, RF & MW

Inductance, Impedance, SFR and Losses in Inductors

Posted by Tomáš Zedníček
On October 4, 2020
0

Inductance L Not only magnetic materials possess a magnetic field, but every current carrying conductor also creates a magnetic field itself. Energy can be temporarily stored in the magnetic field. This effect is technically exploited in coils, consisting of one or more wire windings. The synonymous term “inductor” has become established.

ABC of CLR, EEE Components, PASSIVES

Factors in the Functionality of Transformer in Inductors

Posted by Tomáš Zedníček
On October 4, 2020
0

EMC ferrites are based on Ni-Zn materials. This material has good quality factors (Q < 3) above approx. 20 MHz – i.e. trimmed for high losses. These originate in the core material and serve to absorb EMC interference. The inductance of these components is purposely kept low. Inductors however should show high quality factors, i.e. operate as loss-free as possible and buffer energy in the magnetic field. Also, they require stable inductance values over a wide frequency range. The distinction emphasized is reflected in the layout of the relevant manufacturer catalogue.

EEE Components, PASSIVES

New PCBs on 3D printer, When are we going to print?

Posted by Tomáš Zedníček
On October 4, 2020
1

The development of PCB 3D printers is potentially linked with a number of topics and challenges that can be closely related to passive components. The question I asked myself about 3D PCB printing capabilities was also inhibited by the current shortage of certain passive components.

ACTIVES, EEE Components, PASSIVES

Custom Inductors vs. Ready-Made Options

Posted by Tomáš Zedníček
On September 29, 2020
0

Engineers are under time and budget pressures to complete their tasks efficiently. Designing a power supply can be a daunting task, especially for those without much experience. One of the most critical components will be magnetic. For a basic non-isolated buck, boost, or SEPIC converters, the power storage inductor must be determined.

ABC of CLR, EEE Components, PASSIVES

Dielectric Capacitor Insulation Resistance (IR)

Posted by Tomáš Zedníček
On August 27, 2020
0

Insulation Resistance, IR The dielectric of a capacitor has a large area and a short length. Even if the material is a good isolator there always flows a certain current between the charged electrodes (the current increases exponentially with the temperature). This leakage can be described as a parallel resistance with a high value, an Insulation Resistance (Figure: Schematic of the Insulation Resistance IR in a capacitor.). We use the abbreviation IR in the following.

ABC of CLR, EEE Components, PASSIVES

Definition of Capacitor Losses (ESR, Z, DF, Q)

Posted by Tomáš Zedníček
On August 17, 2020
0

Losses Impedance and ESR A capacitor creates in AC circuits a resistance, the capacitive reactance (Formula C1-3). There is also certain inductance in the capacitor. In AC circuits it produces an inductive reactance that tries to neutralize the capacitive one. Finally the capacitor has resistive losses. Together these three elements produce the impedance, Z.

GaN Testing

Temperature Stability Assessment of GaN Power Amplifiers

Posted by Tomáš Zedníček
On July 5, 2020
0

Ta capacitors have become the favorite choice for BIAS decoupling GaN power amps, ensuring stability at various conditions, keeping the GaN transistor working point within the high linearity region.

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