Questions tagged [schottky]

A Schottky diode typically has a lower forward voltage drop and faster switching speed than a standard silicon diode. Several forms of transistors also use the same Schottky barrier effect such as MESFET to increase switching speed while others include a Schottky diode as a form of clamping.

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53 views

Why do point contact diodes use wire whiskers?

I've recently been learning about the operating principles of various semiconductor devices, and I've run into difficulty regarding the point contact/metal-semiconductor diode. I can't find out why ...
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31 views

Metal semiconductor Junction

As we know in normal p-n junctions is formed by doping on a single semiconductor so that material continuity is maintained which facilitates the movement of charge carriers between two regions. But in ...
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44 views

Schottky diodes for dissimilar Ah e-bike parallel batteries

I have purchased an auxiliary 18 Ah lithium battery to supplement the stock 13 Ah battery. For convenience, I would prefer to configure them in parallel for operation. The resulting slower drain ...
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65 views

How to protect an input from ESD?

I would like to protect the input of a sensor (reference : MAX30001) from ESD. In the datasheet, they say that the absolute maximum rating of this input is -0.3 V < Vinput < 2 V. Do I have ...
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54 views

testing a schottky diode

I'm trying to find how i can test a schottky diode to check it's state but can only find info on 2 pin diodes. The particular diode is this: http://pdf.dzsc.com/2017/20161120/20161120081219688637.pdf ...
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47 views

Detecting activity on LVDS line

For some test equipment I have an LVDS line running at 100 Mbps. I would like to make an Arduino Due (because I use this for other monitoring in the test) detect activity on the LVDS line. Using a (...
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47 views

Schottky diodes voltage clamp Ltspice

I am trying to simulate a voltage clamp using two Schottky diodes. I am trying to recreate the case when a resistor (R1) shorts (0 ohms)... I would expect to have around 3.3v at out port. Without ...
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55 views

Schottky diodes in series to reduce maximum voltage at supercapacitor solar charging circuit

I use the following circuit to store solar energy harvested by photodiodes into a supercapacitor. The cap is rated at maximum 2.8V. The zener diode is rated at 3V, but depending on the harvested solar ...
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49 views

Schottky diode EAS test circuit

I'd like to test the non-repetitive avalanche energy (EAS) of a particular Schottky diode (VS-12CWQ10FN-M3), but I've never done this test before and can't find a typical test circuit. This comes from ...
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84 views

Why is an Enhancement P-Channel MOSFET Used?

I'm trying to design the power circuit for my project. I wanted to implement both USB and a LiPo battery to power it. I came across this circuit online but I'm struggling to understand how it works. ...
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227 views

Flyback Diode for 24V DC Solenoid

I am trying to select a diode to prevent my circuit from being damaged by the collapsing magnetic field from the solenoid in my circuit. Solenoid power will be switched off through the actuation of ...
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81 views

Combining 5V power supplies in parallel to obtain more current

I need to power 20 5V RGB LED strips, each consuming 1A at full white. I'm working with off the shelf 10A supplies, so technically I can power them all by combining two 10A supplies. I read that by ...
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110 views

Why do Schottky diodes have three pins

I don't understand how to deal with a Schottky diode that has three pins is it two diodes and work as two or two that work as one? And if I want to use it as a rectifier would I need only two three ...
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65 views

BAT60A diode allows reverse voltage

I have designed a board and it can be supplied by USB and/or D-Sub connector. The board gets the 5V from USB or another board via D-Sub connector. I have placed 2 schottky diodes to prevent reverse ...
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70 views

Schottky diode / Rectifier Diode difference and how to test them?

I have 3 diodes that I would like to test 1x USD935 2x USD2009 USD935 is identified by its datasheets as a "Power Schottky Rectifier Diode". I cannot find the datasheet of the USD2009 but they have ...
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116 views

Diode selection for step-down Converter

I have built quite some buck converters for ~3A@3-5V (~1MHz, 24V Input) and I always used schottky diodes due to their low forward voltage drop (and therefore low power dissipation during free ...
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91 views

Lowest forward voltage Schottky diode [closed]

I am looking for a lowest V_f possible Schottky diode out there for logic circuits in my designs. So far the best thing I came across is MCL103. It has 200 mV of V_f at 1 mA current. I am not looking ...
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94 views

Would the diode and the fuse protect the other components if power wiring is reversed?

Would the diode and the fuse protect the other components if power wiring is reversed? Is the polarity of the diode correct?
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38 views

Schottky diodes operation

As far as I know the depletion region is created due to the diffusion of majority charge carriers which expose the charge of their ions. Is this the same for Schottky diodes (electrons diffuse from ...
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119 views

DIY UPS for Home Automation/Energy Management system

OK, the original post asked too many questions and I was asked to rewrite the post question. So after reviewing the old post and rethinking the project here it is. So, as requested, I will ask 1 ...
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64 views

Is the switching speed of MOSFET comparable to that of a Schottky diode?

Assuming identical voltage and current rating, which is having higher switching speed? MOSFET or Schottky diode? In synchronous buck converter, we replace Schottky diode with MOSFET (low side) for ...
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122 views

Pull-up resistor in parallel with Schottky barrier diode

I was looking at the Zynq-7000 SOC startup sequence designed in the Zynq Evaluation and Development board (ZedBoard), which requires specific voltage level regulation sequence (1.0V, 1.8V, 3.3V and 1....
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52 views

Over voltage protection without shorting the Output to GND during Over voltage

Here is the circuit diagram i am referring. Vin_12v_ext - Max 12V; Batt_V = max 5.4V; Vin_ext_12v_gen is either Vin_12v_ext or batt_v; 5v_reg - is either generated by an on board regulator or ...
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62 views

Using schottky diode near reverse breakdown region

I am currently using a 1N7070 schottky diode as the output rectifier for a flyback converter. The designed reverse blocking voltage is 70V. However, due to leakage elements I am seeing a transient ...
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66 views

Effect of Schottky diode capacitance for LM2596-based buck converter

I select a schottky diode to output a DC / DC converter. Found several SMD SS52 options. One option has a capacity of 800pF, the other 200pF. The smaller the capacity, the better? The version with ...
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205 views

What is 'Nonrepetitive Peak Surge Current' in diodes?

I just went through many datasheets of diodes but didn't understand the term "Nonrepetitive Peak Surge Current". Can someone please explain this to me?
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178 views

Schottky Diodes as Full Bride Rectifier

I need to make a 75-100vdc high current power supply. I do not have any high current diodes or bridge rectifier ic’s but I do have a load of scrap switching power supplies. Could I take 4 of the(lack ...
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967 views

Analog input over-voltage protection using Schottky and Zener Diodes. Can it work?

I'm developing an analog input module based on TI's ADS8668 and want to protect the input channels from over-voltage. According to the datasheet, each analog input channel withstands voltages from -...
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113 views

Drawback of using Schottky Diode to lower MOSFET threshold voltage?

I am considering using Schottky diode to lower PMOS's Vth as the following diagram: As the current extracted from Schottky diode is small enough to provide 0.3-0.4V voltage drop, PMOS's threshold ...
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185 views

What is the best method for reverse voltage protection of a microcontroller

When connecting a USB to TTL cable to flash a microcontroller (ESP32), I want to provide reverse voltage protection because connecting the pins in the wrong direction is easy to do and will destroy ...
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520 views

Protect ADC input from over-voltage with Schottky diodes

Alan Walsh on this article has suggested using Schottky diodes to protect ADC input from over-voltage, the circuit looks like below: simulate this circuit – Schematic created using CircuitLab ...
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502 views

Disadvantage of using a Schottky diode across the LDO input/output for reverse voltage protection

I'm studying a linear power supply circuit design for my future project and I started off disassemblying a good(expensive) LPS out in the market. While I was studying it, there was a part that I wasn'...
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294 views

Should I replace this Schottky Diode?

electronics noob here. Just looking for some advice on replacing a part for a ebike motor controller. I think I may have shorted one of the schottky diodes (part) by running current through the ...
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136 views

Using 1N5822 (40v 3A) schottky instead of 1N5819 (40v, 1A)

Is it okay to substitute 1A 40V Schottky with 40V 3A version of it and what can go wrong with that setup?
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353 views

Can Zener or Schottky diodes be used as a substitute for varicap diodes in tuning a VCO?

In particular, this would be a fairly low frequency VCO with a frequency range of 10 Hz to 20 kHz. I'm thinking of the configuration with the T-junction that has 2 opposite facing, reversed biased ...
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23 views

Schottky datasheet - divergence in Vf / If diagram vs “pulse test” table values

while looking at datasheets for clamping schottky diodes, I noticed that the values that manufacturers state in their tables ("Pulse test: tp < 300 µs; delta < 0.02.") are different from the ...
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Adding Diodes to Transistor Astable Multivibrator; 1N5818 Schottky diodes work but 1N4148 diodes don't; can't figure out why

I am an avid electronics hobbyist, not an electronics engineer. I built a transistor-based astable multivibrator circuit and then fed its output to an op amp buffer amplifier which then drove an 8 ...
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183 views

Can a TTL LS device (low-power Schottky) serve as an input to a basic TTL device?

A 74121 (One-shot) worked well as a reset to a counter device. There is an enable line using a 7400 NAND gate to allow or disallow the trigger to pass. While duplicating the circuit, I found that all ...
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34 views

The way to efficiently operate some power devices with less loss, and appropriate heat sharing

I'm using a buck converter(OKR-T/10-W12-C made by Murata Power Solutions). The converter supports 4.5 ~ 14.0V input. The input is 9.5V voltage from the another buck device. And between of them, the ...
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48 views

How to narrow down choice of diode given max voltage and max current drawn [closed]

I'm working on a project that uses this board I made and the Arduino Mega 2560, where the board will need to be powered by the Mega's +5V pin at certain times. A connector will be used to bridge the ...
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32 views

intrinsically matched Schottky diodes (sharing common substrate)?

I'm looking for a pair of Schottky diodes on a single die: one to use as a non-linear element and one to measure the temperature. All of the dual Schottky's I've found so far are on separate dice, ...
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118 views

Why can't I get the output of a 74LS221 to idle at 5 VDC?

I have an industrial machine with an encoder feeding a Measurement Computing USB-CTR08 counter board. In order for the board to count the pulses the counter's gate ...
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164 views

How can I get this circuit to “make noise”

I designed this noise generator circuit that uses a 1N514 Schottky diode with a VDB transistor amplifier(note: the upper VDB resistor is actually 15kOhm). Looking at the oscilloscope trace it seems to ...
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115 views

Does IRF3710 have a schottky diode inside?

I'm using IRF3710 MOSFET H-bridge for 40A 12V motor driver. Should I use a schottky diode inside or should I use a separate one?
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104 views

Cost vs quality and performance of H-bridge

I'm working on a project where low cost and small BOM is just as important as optimal functionality. The goal is to drive a cheap DC motor (aka 'yellow motor'), in two directions, optionally with PWM. ...
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70 views

Factors affecting the \$V_f\$ of a Schottky diode

The usual wisdom about Schottky diodes is that their \$V_f\$ is around 0.2 to 0.3 volts, but what specifically determines this? I know that for p-n diodes, doping concentration can affect the forward ...
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256 views

Diode Substitution

I am creating a printed circuit board that is utilizing a circuit from a sparkfun product: (https://www.digikey.ca/product-detail/en/sparkfun-electronics/SEN-12642/1568-1290-ND/5762440) I have ...
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250 views

How does this Current Comparator Circuit Work?

I have a quick couple of questions about this circuit: The schottky diodes are obviously for minimizing slew delay but how exactly do they do this? If the non inverting input is tied to ground and ...
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144 views

Use of Dual Schottky diode in voltage supervisor output

I was exploring one of the popular Tiva C launchpad (http://processors.wiki.ti.com/index.php/Tiva_C_Series_LaunchPads) to create a custom board based on TM4C123GXL evaluation kit. There is a Schottky ...
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128 views

LTC3780 for charging batteries (backflow protection)

I have very little experience with these type of things and I couldn't find the answer anywhere else. I want to use LTC3780 module with ATX PSU to primarily charge batteries (deep cycle battery and ...