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.

Filter by
Sorted by
Tagged with
0
votes
0answers
41 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 ...
1
vote
0answers
43 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 ...
1
vote
0answers
26 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 ...
2
votes
1answer
55 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?
0
votes
1answer
97 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 ...
3
votes
1answer
126 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 -...
0
votes
1answer
88 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 ...
0
votes
2answers
128 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 ...
2
votes
2answers
208 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 ...
2
votes
2answers
210 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'...
0
votes
1answer
116 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 ...
0
votes
1answer
59 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?
1
vote
2answers
115 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 ...
0
votes
1answer
21 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 ...
5
votes
3answers
472 views

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 ...
1
vote
2answers
111 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 ...
0
votes
1answer
33 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 ...
0
votes
2answers
47 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 ...
0
votes
0answers
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, ...
0
votes
0answers
81 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 ...
4
votes
1answer
152 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 ...
-2
votes
1answer
104 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?
2
votes
1answer
64 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. ...
2
votes
0answers
55 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 ...
0
votes
1answer
100 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 ...
1
vote
1answer
127 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 ...
0
votes
2answers
90 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 ...
1
vote
0answers
89 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 ...
0
votes
2answers
50 views

noise comparions between Schottky and MOSFET

I have a circuit that uses a Schottky diode to provide reverse voltage protection. However, the diode chosen is on a long lead time and an alternative that is immediately available is required. I've ...
1
vote
2answers
188 views

Diode Array for Full-Wave Rectifier for PoE

I was looking for SCHOTTKY diode for designing Full-Wave Rectifier for PoE. I was searching for the diode but came across the ...
6
votes
2answers
248 views

Self-made Schottky transistor doesn't behave as I'd expect

For a project of mine I need to generate UART-like signals with higher voltage (up to 18V) and a baudrate of 115200 bps and later possibly 250000 bps. I tried a basic BJT level shifter which worked as ...
0
votes
2answers
518 views

Schottky - Zener - TVS diode

I have a question!. As I understand,the 3 diodes are "more or less" the same but with really important differences: Zener diode: Clamps voltage at a breakout lvl. Schottky diode: Like Zener but it ...
1
vote
2answers
245 views

T.I H-Bridge design with No protection diodes?

I am still on my struggle trying to design my own Brushed DC H-bridge with all N-MOS, still in the research stage and burning mosfets left and right. I have come across this T.I design ,relatively ...
-1
votes
2answers
246 views

Charge 5,4V supercap with 12V solar panel

I'm building a circuit to charge a series of two supercap (500F, 2.7V each) with a solar panel (wich outputs, not sc, 18V@1.5A with direct sunlight at 12pm). Those supercap will then power an esp8266 ...
1
vote
1answer
984 views

Multiple DC power source to the board protected by schottky diodes

Provided is the DC power supply block to the micro-controller development board from one of the leading MCU manufacturers. I need help to understand this arrangement. I will use two sources V5-...
2
votes
0answers
48 views

Are there BJTs based on metal-semiconductor junctions?

So, I know that the fundamental part of a BJT is having a very thin base region that allows minority carriers to diffuse through it before they recombine. It seems to me, then, that it should be ...
1
vote
1answer
99 views

Demodulator with Schottky diodes

I was wondering how this demodulator works. The input voltage is on the left at C2 and the output voltage is on the right before C3. What is clear: C2 filters out low frequencies at the input, C3 ...
0
votes
2answers
182 views

Handling power loss in a Microcontroller

I am trying to save the context of a microcontroller during a power loss. I already have a detection circuit which tells the microcontroller about the power loss. During a power failure, I needed some ...
4
votes
1answer
6k views

What is a typical diode's ideality factor?

Some background, for anyone unfamiliar: The Shockley diode equation is \$I_D=I_S·(e^{\frac{V_D}{n·V_T}}-1)\$ with the quantity \$n\$ called the ideality factor, a number between 1 and 2. Ideal ...
3
votes
2answers
276 views

Tesla free energy collector

I'm trying to see how this circuit works: This is taken from http://www.instructables.com/id/TESLA-FREE-ENERGY-COLLECTOR/. I tried the circuit with 1n4148 diode and I can see a voltage on the ...
1
vote
3answers
503 views

High Frequency Rectification

I am trying to monitor an incoming signal and get some properties from it. The signal is a sine wave +-5V at 900Mhz. I am trying to measure the amplitude and the frequency of the signal. I will ...
0
votes
1answer
368 views

Applying negative voltage to CMOS chips

I have a situation where it's possible a negative voltage may appear on the power supply rails driving CMOS chips. The negative voltage will be very limited in current, fed through a resistor. The ...
1
vote
2answers
614 views

How to model a Schottky diode based on datasheet?

I have a question about how to model a non-linear a Schottky diode based on available datasheet in ADS. Should I just assign Rs and Cj values from datasheet? http://datasheet.octopart.com/DMK2790-...
2
votes
2answers
4k views

Do I need a Schottky diode as a flyback diode with PWM @ 30khz?

I use a regular diode (1N4007) as a flyback diode for a 250ma 5v fan. My transistor is a <...
0
votes
3answers
266 views

difference in reverse voltage of diodes?

I have a 9V circuit to operate latching relays. Because there are instances where two independent DC power supplies meet briefly, I decided to implement schottky diodes in the circuit to prevent them ...
0
votes
0answers
56 views

Diodes for mixer design

For a diode ring mixer, how should I choose the types of diodes? I've seen Schottky diodes as the primary choice. but why not PIN diodes? What diode aspects should I consider when designing a mixer? ...
0
votes
1answer
52 views

Can I replace a NUP2105L voltage suppressor with a NUP3105L?

Someone gifted me a device to read electronic control units from cars and trucks. They gave it to me because they don't use it and they have also removed some components from it to fix another device. ...
6
votes
3answers
281 views

When would I not want to replace a PN diode with a Schottky diode

When repairing or maintaining equipment, or even during design revisions, why would I, for electrical reasons (not interested in the potential financial aspects) not want to replace a PN junction with ...
3
votes
1answer
400 views

Connecting Schottky to Postive Supply

The circuit has 12V SMPS & 3.3V LDO supplies. Does connecting the Schottky diode SD2 to 24V supply is advisable? If so, is there any advantage over connecting to 3.3V supply? The Zener diode ZD ...
1
vote
2answers
429 views

Debouncing Circuit with Schottky Diode

I found the following circuit interfacing with a GPIO input on an MCU that has an internal pull up resistor. The GPIO is being used to detect the state of the push button. I have two questions ...