ACTIVES, EEE Components, PASSIVES, SPECIFICATIONS / QPLs

Issue 196 Of ESCC QUALIFIED PART LIST (QPL)

Posted by Emilio Cano García
On May 20, 2019
0

ESCC QUALIFIED PART LIST (QPL) The changes in issue 196 of ESCC QUALIFIED PART LIST (QPL) are included in the DCR 1266 and detailed here

EEE Components, PASSIVES

MLCC capacitors, when cracks occur?

Posted by Mari Carmen López
On May 16, 2019
0

Ceramic capacitors are the most widely used passive component in the electronic circuit. MLCCs are composed of dielectric layers, inner electrodes, and outer terminal electrodes. Some MCLL designs add Flexible Terminations to improve the performance of the device.

EEE Components, PASSIVES

MLCC cracking issues in low voltage is report & evaluates by NASA

Posted by Tomáš Zedníček
On May 15, 2019
0

Report prepared by Alexander Teverovsky, ASRC Federal Space and Defense. NASA recently released an extensive 70pages report on low voltage MLCC cracking issues published on nepp.nasa.gov. The report in detail describes the manufacturing process of MLCC types, provide comparative analyses of MIL, NASA vs ESA vs JAXA specifications, explains qualification procedures and cracking risk issues including degradation and failure mechanisms. The final section recommends methods for workmanship and failure detection.

ACTIVES, PASSIVES

RC Snubber Design for SMPS Protection (Part I)

Posted by doEEEt Media Group
On May 13, 2019
0

This is the first of the two articles devoted to the topic of an RC snubber design. In Part I, we discuss the fundamentals of inductive switching and the need for circuit protection. The impact of an RC snubber on the circuit performance is demonstrated through a series of simulations. Part II (to appear in the March 2019 issue of In Compliance) will address the systematic process of the snubber circuit design, together with the simulation and verification through the laboratory measurements.

ABC of CLR, EEE Components, PASSIVES

Equivalent Circuits and Circuit Types of Inductors

Posted by Tomáš Zedníček
On May 3, 2019
0

Modern measuring equipment, such as the HP4195A impedance analyzer and similar instruments, allow computer-aided derivation of equivalent circuits and their optimization. Constant parameters for inductance L, capacitance C, and resistance R are required for the simulation of electronic circuits. An incorrect approach in defining an equivalent circuit leads to flawed or incorrect simulation results.

ABC of CLR, EEE Components, PASSIVES

Comparison Charts of Film & Foil Organic Capacitors

Posted by Tomáš Zedníček
On April 30, 2019
0

Some comparison graphs between different dielectric types of organic capacitors are depicted in this post

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

Hi-Rel EEE Parts Mounting Techniques Overview

Posted by Tomáš Zedníček
On April 30, 2019
0

IR reflow soldering IR infrared “convection” reflow is commonly used in commercial large volume SMD components mounting process. The main differences in reflow soldering processes and oven types lie in heat transfer methods – radiation, conduction, convection, and condensation. In fact, all heat transfers are used in modern reflow ovens. The heat is applied from above, below, or all directions dependent on the equipment being used. In classical infrared “radiation” reflow ovens, several ceramic heaters are transferring the heat to the assemblies, moving through the oven on a conveyor belt, by radiation.

ABC of CLR, EEE Components, PASSIVES

Pulse Load, Power and Voltage Derating on Resistors

Posted by Tomáš Zedníček
On March 6, 2019
0

PULSE LOADS In many applications, the resistor will be subjected to pulse loads. We make distinctions between periodical/repetitive loads and pulse trains; on one hand, where the pulse is repeated at a certain frequency, and on the other separate pulses where a possible repetition will occur after so long time that the resistor has recovered its original ambient temperature.

EEE Components, PASSIVES

Magnetic Induction (B) and Flux (F). Faraday’s Law explanation

Posted by Tomáš Zedníček
On March 5, 2019
2

A potential is induced in a conductor loop if the magnetic field passing through the conductor loop changes with time. The surge in potential over the area of the loop is known as the magnetic induction B. Like the magnetic field strength, the magnetic induction B is a vector quantity.

ABC of CLR, EEE Components, PASSIVES

Capacitance, Dipoles and Dielectric Absorption

Posted by Tomáš Zedníček
On March 4, 2019
0

The Capacitance is determined by, among other things, the characteristics of the dielectric material. International standards speak of the Dielectric Constant or permittivity, designated by the symbol ε.

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