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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3answers
300 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 ...
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1answer
406 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 ...
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453 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 ...
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454 views

Need help identifying a mystery component with double-diode marking

I've found this MOSFET-shaped component inside a Dell laptop power supply (I've lost the case so I can't tell you any details, sorry): The problem is that I can't find any datasheet for it anywhere. ...
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2k views

Choosing the right Schottky for the voltage/amperage

What do these ratings mean when it comes to reading datasheets for Schottky and how do you pick a diode based on these ratings: Current, Forward, Continuous <...
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1answer
433 views

Protect battery from overvoltage - DC brushless motor overspeeding condition

I'm trying to figure how to protect batteries from overvoltage on my electric skate. Specific condition is : motor would run above max RPM based on system voltage. Motor is 85Kv, battery voltage is ...
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2answers
248 views

Noise margin of a cascade connection of Schottky clamped transistor and a regular transistor

simulate this circuit – Schematic created using CircuitLab This is a buffer. So what's the \$Vil - Vol\$ ? I would have thought it's it's \$Vbe - Vces\$, but that's incorrect. Does Q1 ever go ...
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2answers
696 views

LM78xx Reverse Polarity and Reverse Bias

I'm building a circuit that will use a LM7805 and LM7812 to produce 5VDC and 12VDC respectively, with the input power being ~16VDC from an external wall wart. I already fried one of each regulator ...
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1answer
2k views

Load Sharing charging circuit for Lithium polymer

Charging lithium battery while at the same time trying to use circuit didn’t quite workout, with problems like the circuit not turning on and the battery never finish charging. The battery is 3.7V ...
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1answer
463 views

Schottky diode in series

I have a circuit from u-blox website in which the backup voltage pin of NEO-M8N is connected to coin cell battery 3V. In the circuit, they put two schottky ss14 1A 40V in series with the battery. Is ...
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1answer
377 views

Extra (diode?) protection for H-bridge to prevent damage - how?

I am trying to use a IMS-1 H-Bridge with a 24V/20A psu and a motor 24V/20A. I already burned one of these H-bridges in one direction and I assume that was caused by a back EMF. Specs of the H-bridge ...
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73 views

1N5821 Schottky diode material

Is the 1N5821 Schottky diode made of silicon? Or is it composed of other materials?
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1k views

Forward voltage schottky

If I want to use a Schottky diode with a forward voltage of 450 mV at 1 A. Is the forward voltage the same at 0.3 mA? The diode is a 1N5817 and for 10 mA there is Vf=0 V. If I put this diode in ...
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1answer
647 views

How do I figure out which Schottky diode to use?

I'm not well-versed in the domain of electrical engineering, so please bear with me if this question is too basic. I'm putting together an automatic watering system for my greenhouse. Basically, it's ...
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1answer
4k views

Sensitivity of Schottky Diodes to ESD, effectiveness vs TVS diodes

I'm trying to protect a component against ESD strikes - this component is particularly sensitive, so I am also trying to protect against sub-ns strikes. Forward voltage (max allowable) is 8V, reverse ...
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2answers
712 views

Stepper Motor wind turbine AC to DC - what diodes / or rectifier to use?

I'm building a small wind turbine from this tutorial. It uses Nema 17 stepper motor as the generator. We need to convert the AC of the motor to DC. The setup is said to be able to produce up to 30V ...
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1answer
703 views

Why Schottky diode’s cut in voltage is less and the reverse saturation current is more than normal P-N junction diode? [closed]

I want to know how do we achieve lower forward voltage as much as 0.2-0.3 volt in schottky diodes.
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217 views

Schottky diode part of a laser power supply enable circuit

In this circuit from Jim Williams' AN90 the enable line pulls down the base of Q1 through Q2, through a Schottky diode (1n5712). Why is this Schottky diode there? I imagine it's a Schottky diode so it ...
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2answers
289 views

How to power from among several sources and monitor which sources are active?

I have a microcontroller circuit that uses voltage dividers to monitor presence of 5V DC power from several sources, but the circuit is currently powered from a separate 5V DC source. I've seen ...
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1answer
297 views

Output of 4.8V due to reverse polarity series schottky diode?

I was reading through the Data Sheet for the Photon, an IoT dev board: https://docs.particle.io/datasheets/photon-datasheet/ and under the Power section it says: When the Photon is powered via the ...
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2answers
322 views

Low Voltage limiter circuit with fast recovery time

Hello I am having trouble building/finding parts for a circuit that I need to limit the peak voltage of a signal coming from a photodetector. My problem is that an amplifier I am using will not ...
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2answers
330 views

Use of schottky diode and tracking peaks of input signal with capacitors

I am using this instructable to make a VU meter: http://www.instructables.com/id/Mini-Decibels-a-Simple-Volume-Meter-With-an-Electr/?ALLSTEPS I have two questions. What's the use of the Schottky ...
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1answer
367 views

protecting batteries from cross discharge

I am charging multiple batteries in parallel using a solar panel. The batteries are not meant to be used together and their voltages might be different when connected for charging. Another issue is ...
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3answers
3k views

Power Dissipation of Schottky Diode

I am implementing a circuit as shown below :- Source is a 15V Solar panel & Load is the Battery. The intent is that if someone tries to connect a bigger battery on the output, Diode(Schottky is ...
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4answers
231 views

Help understanding high \$V_F\$ ratings of Schottky diodes

My reason for wanting to pick a Schottky diode is being lead to believe they have lower \$V_F\$ than conventional silicon or germanium ones. So I was a little taken back to look at offerings at Mouser ...
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1answer
3k views

Burnt SMD diode identification. General Semiconductor S4 6CA

I have an Artesyn 7001138-Y000 835 server power supply unit that has a burnt component. The burnt component reads S4 6CA and has the general Semiconductor logo on it. I have been looking online to ...
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3answers
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Using a schottky diode to improve PNP transistor turn off time

I was able to use the following schematic to improve the turn off time of a NPN transistor Adding a schottky diode (even externally to transistor) component reduces the turn off time dramatically. ...
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1answer
1k views

Schottky diode equivalence in RF wattmeter?

I think I may have fried D1 in the circuit below, if that seems plausible? (During my initial testing, with up to 15W of input power, I had an open circuit after R4. I really don't understand how this ...
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2answers
803 views

Diode oring and charger

I am trying to setup a schottky diode oring circuit to switch between my battery and a dc power supply. I am dealing with some pretty high amperages and a liPo battery, so I need to make sure I get ...
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3answers
464 views

How to to Use a Nylon Shoulder Washer?

I'm somewhat curious as to how to use a nylon shoulder washer with a bolt. There is an example of this here (https://electronics.stackexchange.com/a/45579/95654), but I can't figure out how it would ...
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1answer
2k views

Voltage regulator using bipolar NPN transistor

I came across a circuit, and I got some questions about it. What is the reasoning behind using the NPN-transistor? What part of the circuit draws the most current?
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1answer
237 views

BAT54c and TVS SM6T39A application usage?

I need to design a circuit for my vehicle tracking application and i am using pic micro-controller . I need to capture the iginition status of a vehicle using the micro-controller ,where i have ...
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2answers
672 views

Diode Bridge Rectifier using Dual Schottkey Diode Bridge

I am trying to develop the first stage circuitry of a kinetic energy harvester from that is made using magnets and a coil. I attach a photo of the harvester taken during development. My intention is ...
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1answer
329 views

Reverse voltage protection diode - necessary?

I'm designing a system to drive 5 strips of RGB LEDs, it will draw around 25 amps, at 12 volts. This system is only going to be used by me, and I have the suitable power supply coming in the mail. ...
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1answer
2k views

Suitable Schottky (Dual) Bridge Rectifier ICs to protect stepper motor drivers

I need to protect a number of 24V stepper motor drivers from cable disconnects as described in "Adding diodes to easy driver stepper motor driver". This means using eight Schottky diodes with a ...
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1answer
1k views

Why do Schottky diodes have two anodes?

I was looking for a SMD diode to add reverse-polarity protection to a circuit I was designing, and the PMEG3020CPA looked like a good fit with regards to my current and voltage needs. What confused ...
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2answers
699 views

SPI Isolation with Open Drain MISO

So I am trying to interface a slave device to a master uC through an ADUM4151 SPI Isolator and am getting confused on where I need pullups for the MISO line as I see it a few ways in reference designs....
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2answers
2k views

What exactly determines recovery time of Schottky diodes?

I did see that low-voltage Schottky diodes have essentially zero recovery time. But would not there be still a small recovery time even for low-voltage Schottky diodes? IF so, what determines recovery ...
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1answer
7k views

Why does this schottky diode have three pins [duplicate]

I'm just wondering why this schottky diode have three pins? I know two of the pins acts like rectifier but what does the a third pin do? Source: http://www.digikey.com/product-detail/en/DB3J208K0L/...
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1answer
483 views

schottky diode power rating

I am trying to calculate the power rating of a schottky diode. The diode in question is the 1N5822U from ST Micro (a rad hard schottky diode). The datasheet is - Diode datasheet Now, I am using in a ...
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1answer
853 views

Does this Schottky provide MOSFET transient protection?

I'm studying the schematic for an electronic load available as a kit from Jameco: http://www.jameco.com/Jameco/Products/ProdDS/2161107%20Schematic.pdf There is a Schottky diode shunting the source-to-...
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1answer
308 views

Most efficient two-way switch relay and/or schottky (or..)

Scenario: On my old military Land Rover I have a three-way pole switch which turns the pilot and tail lights on (top position), or also turns on the headlights (bottom position). Top: Pilot and rear ...
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1answer
138 views

Is it a good choice to use mbrb1545ct schottky for the 5 MHz signal clipper?

For my application, I need to clip 5 MHz(max) signal to stay within ±0.5 V. I selected two of mbrb1545ct Schottky to clip my signal. I selected Schottky because I think they are faster to turn on and ...
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3answers
2k views

microcontroller input protection with Schottky clipping diodes

I regularly see the use of Schottky diodes in order to protect microcontroller inputs from overvoltages (>5V). The Schottky diodes are connected to the 5V power supply (cathode) and the ...
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1answer
1k views

Protecting I2C bus with diodes

I'm trying to add some protection to an I2C bus, and keep getting an unexpected result. simulate this circuit – Schematic created using CircuitLab In principle, I'd expect this to clamp the ...
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1answer
128 views

How do I clip voltage between ±0.5 for ADC input?

I have an ADC which accepts 0.5 to -0.5 V for input. How do I clamp the voltage at the input of the ADC to assure protection and maintain voltages between 0.5 to -0.5? Any Suggestion?
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3answers
135 views

source indicator, dual schottky passive load transfer switch

A dual schottky diode powers a load from either battery or off-the-shelf power supply. How to indicate which sources are providing current to the load? None, one, the other, or both. Yet draw less ...
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4answers
1k views

Floating diode in a Sot23 package

I have a schottky diode in a sot23 package that is composed by 2 schottky diodes with a common catode connection. I need to use one of them. Should I let the second floating with unconnected pin or ...
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1answer
2k views

Schottky diode as AM detector?

An old AM radio that passed down to me from my grandparents finally ceased to function after I accidentally dropped it and old parts inside got damaged. I ripped all damaged parts out and replaced ...
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1answer
1k views

Reverse recovery time of Schottky diodes

I am considering redesigning a IR2110-based H-bridge driver with 1N5819 because UF4007 he ...