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Posts Tagged ‘vishay’

App note: How to avoid chipLEDs sticking to cover tape during automated tape-and-reel assembly

Sunday, December 16th, 2018

Investigative app note from Vishay on preventing too light components from sticking on the cover tape of their reel. Link here (PDF) Customers have informed Vishay that 0603 LEDs (ChipLEDs) supplied in tape and reel format sometimes stick to the PSA cover tape that is peeled off from the carrier...

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App note: AC ripple current calculations solid tantalum capacitors

Sunday, August 19th, 2018

Application note from Vishay on power and voltage limitations of solid tantalum capacitors for both low and high frequency applications. Link here (PDF) Solid tantalum capacitors are preferred for filtering applications in small power supplies and DC/DC converters in a broad range of military, industrial and commercial systems including computers,...

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App note: Power management solution – Constant Voltage (CV) pulse charging of hybrid capacitors

Sunday, May 13th, 2018

App note from Vishay about constant voltage (CV) pulse charging as the most cost-efficient solution to use on Hyrid capacitors. Link here (PDF) Rechargeable energy storage solutions are of high interest because of their flexibility, low maintenance requirements, and reduced cost over their life-cycle. For compact applications, classic electrolytic capacitors...

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App note: Capacitance change with applied DC voltage

Sunday, October 8th, 2017

Tantalum comparison to other types of capacitors shows stable capacitance in this app note from Vishay, Link here (PDF) Tantalum capacitors in general - and Vishay’s 298D/TR8/TM8 MicroTan tantalum capacitors in particular - demonstrate very stable performance over the DC voltage (bias) applied in an application. At the same time,...

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App note: Through-Hole versus SMD components

Sunday, September 3rd, 2017

App note from Vishay on the advantages of using Through-Hole mounting. Link here (PDF) Most electronic gadgets are designed to interface with humans, and we humans are very abusive to most electronic devices. We drop them, poke them, open and close them, and in general feed stuff into and out...

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App note: Thermal management in surface-mounted resistor applications

Sunday, September 3rd, 2017

App note from Vishay on PCB thermal management specifically on components like SMD resistors, where if allowed a design change (e.g. change in SMD size or change in more heat tolarant ones) must be implemented in order to squeeze more thermal capability. Link here (PDF) Thermal management is becoming more...

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App note: Potentiometers and trimmers

Sunday, August 27th, 2017

App note from Vishay on variable resistors primer. Link here (PDF) A potentiometer is a mechanically actuated variable resistor with three terminals. Two of the terminals are linked to the ends of the resistive element and the third is connected to a mobile contact moving over the resistive track. The...

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App note: Application of leaded resistors in energy meters

Sunday, May 28th, 2017

App note from Vishay about energy meter circuits and the use of leaded resistors on them. Link here (PDF) An electric meter or energy meter is a device that measures the amount of electrical energy supplied to a residence or business. It is also known as (k)Wh meter. The main...

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App note: Overcurrent protection with Thin Film resistors technology

Sunday, May 28th, 2017

A technical note about Thin Film fuses from Vishay. Link here (PDF) Thin film technology is an established technology for high-grade passive components, which has been proved and refined over decades. Its advantages in terms of accuracy, repeatability and stability are appreciated in mass production for billions of thin film...

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App note: Solid state relays input resistor selection

Sunday, December 25th, 2016

SSR or solid state relays input resistor recommendation app note from Vishay. Link here (PDF) Solid state relays (SSRs) are commonly driven by TTL or buffered CMOS logic gates. These gates, when used to sink current, provide adequate drive for SSRs. An open-collector output is not required to drive the...

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App note: The heat is on – High-power surface-mount resistors

Sunday, December 25th, 2016

Application notes from Vishay on effective heat dissipation for their aluminum nitride utilized resistors. Link here (PDF) The intent is to discuss a few techniques to manage the heat that is generated by high-power surface-mount resistors and the effects they will have on design space, complexity, and cost.

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App note: EPIC: Electro-Pyrotechnic Initiator Chip Resistor

Sunday, December 4th, 2016

An application note on Vishay's electro-pyrotechnic resistor chip made from thin film technology. Link here (PDF) In this paper we will show how the EPIC’s thin film construction is unique in providing pyrotechnic engineers with outstanding performances in terms of firing energy, firing time, reproducibility and reliability, easy set up,...

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App note: Using Vishay infrared receivers in a Wi-Fi environment

Sunday, September 25th, 2016

2.4Ghz and 5 Ghz Wi-fi signals can sometimes affect IR receivers, here's Vishay's app note about them. Link here (PDF) In recent years, Wi-Fi connectivity has penetrated most consumer electronic devices used for media reproduction. New TVs, satellite receiver and cable boxes, and streaming devices are more often than not...

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App note: Solid state relay parallel and DC operation

Sunday, July 31st, 2016

Parallel two solid state relays for improved current handling and avoiding imbalance of load distribution are discussed in this an app note from Vishay. Link here (PDF) Vishay solid state relay (SSR) outputs can be wired in parallel enabling the user to benefit from lower on-resistance and higher load currents...

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App note: Solid-State Relays

Sunday, July 31st, 2016

Solid-state relays introduction from Vishay, Link here (PDF) MOSFET SSRs feature an optocoupler construction, but have a pair of MOSFETs on the output instead of a phototransistor. A pair of source-coupled MOSFETs emulate an electromechanical relay by providing bidirectional switch capability and a linear contact. No output power supply is...

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App note: Rectifiers for Power Factor Correction

Sunday, July 10th, 2016

Another Vishay's app note about power factor correction this time about the component used and their effects. Link here (PDF) PFC devices are generally selected base on the speed of their reverse recovery time (trr). Currently for CCM (Continuous-Conduction-Mode) and CRM (Critical Conduction-Mode) PFC devices in market, rectifiers up to...

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App note: Power factor correction with ultrafast diodes

Sunday, July 10th, 2016

Vishay's app note in keeping the power supplies' power factor in check with their ultrafast diodes. Link here (PDF) More and more switched mode power supplies (SMPS) are being designed with an active power factor correction (PFC) input stage. This is mainly due to the introduction of regulations aimed at...

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App note: HVArc Guard® surface-mount capacitors for low-power voltage multiplier applications

Sunday, May 8th, 2016

Application note on Vishay's arc resistant SMD capacitors, Link here (PDF) Voltage multipliers can generate very high voltages due to an inverter circuit that feeds a step-up transformer, which is connected to the multiplier circuit. An example of a typical voltage multiplier, which is simply a circuit comprised of capacitors...

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App note: AC film capacitors in connection with the mains

Sunday, May 8th, 2016

An application note from Vishay about choosing the right filter capacitors that are placed directly on mains. Link here (PDF) To help reducing emission and increasing the immunity of radio interference, electromagnetic interference suppression film capacitors (EMI capacitors) are playing a major role in all kind of applications. These capacitors...

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App note: Power MOSFET in high-side operating modes, possible failure modes, and failure signatures

Saturday, January 2nd, 2016

App note from Vishay on high-side MOSFET failures investigation leads to one of the following modes of operation: (a) High-impedance gate drive (b) Electro-static discharge (ESD) exposure (c) Electrical over-stressed (EOS) operation More on it here (PDF) Power MOSFET failures in high-side applications can often be attributed to a high-impedance...

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