Questions tagged [junction]
31 questions
11
votes
3 answers
What does the 'junction' of a silicon semiconductor look like in real-life?
The P-N junction is a small area within a package where heating is most prominent. Junction temperature is a key parameter we try to track when operating a diode or a transistor.
I am wondering what the so-called 'junction' really looks like in…
HYQ
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11
votes
3 answers
Can SiC diodes run at higher temperature than common silicon diodes?
For a usual silicon semiconductor, the junction temperature is rated at 150 degree C. That said, for lifespan reasons, the usual limit for junction temperature is around 100 degree C.
My question is whether a SiC device, say a diode, can allow us to…
HYQ
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10
votes
5 answers
Where is the cold junction on the commercial thermocouples?
According to all textbooks and articles, a thermocouple must have a cold junction somewhere on the middle of it.
But none of the commercial products have a middle point or a marked spot for indicating the position of the cold junction. They are…
hkBattousai
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4
votes
2 answers
What prevents the lead attached to a semiconductor from forming Shottky junction
What prevents lead attached to a piece of semiconductor (for example in BJTs and FETs) from forming a Shottky junction?
Martin
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3
votes
2 answers
Evaluating junction temperature from thermal imaging data
I have a SOD-123F diode through which a current of ~1A flows, creating a forward voltage drop of around 300mV. The datasheet does not specify Rjc but gives Rja = 200 C/W and Rjl = 70 C/W for a 10cm x 10cm copper pad area (!). I only have 12 mil…
gsimard
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3
votes
1 answer
Why can't current go through two voltage source junction?
I crossed out the middle because it felt like it wouldn't make sense. (Mostly because i felt like conservation of current was violated.) But im not sure why it wont go through at that particular section. I thought whenever you have junction the…
Sysnaptic
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2
votes
1 answer
Why aren't the majority charge carriers attracted by terminals of a battery when the p n junction is reverse biased?
It is clear that when the junction is reverse biased, the free electrons from the n side can not pass the depletion layer and fill the holes in the p side. But why will the free electrons not move toward the battery's positive terminal instead? at…
Tomas
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2
votes
1 answer
Calculating maximum power dissipation based on contact area between two metal conductors
I am trying to figure out how to properly calculate the minimum contact surface area based on the maximum required power dissipation. Let me explain..
I am creating a custom semi-circular metal tab that makes an electrical connection to a metal…
Willis
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1
vote
6 answers
No voltage gain in a common-emitter class A amplifier using a 3904 NPN transistor - Ngspice simulation
I am currently trying to build an amplifier for a condenser microphone in order to use it as a way to amplify an acoustic guitar. I am having some trouble to achieve my goals.
In order to learn I decided to make some analog simulations using…
Man789
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1
vote
1 answer
Case temperature MOSFET
I am going to use a nMOSFET (NTMFS5C670NL) which will a varied power dissipation. The current going from drain to source is determined by a control signal. The maximum power dissipation for the MOSFET is 1.29 W.
The junction-to-case thermal…
Tungstein
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1
vote
1 answer
Majority Charge carriers and electron holes
Suppose I have an extrinsic semiconductor made of silicon and doped with phosphorous. Now, phosphorous has one more electron than silicon. After replacing one silicon atom, and taking its place, the phosphorous safely form covalent bonds with four…
Nakshatra Gangopadhay
- 113
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1
vote
1 answer
Why is the collector region doped?
As long as within the active region the collector-emitter junction is reverse biased, is there a purpose for which the collector must be doped? Moreover, not only that it is doped, but it is moderately doped, thus more than slightly doped like the…
pauk
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1
vote
1 answer
Blocking voltage of diodes
What exactly is blocking voltage in relation with Metal-semiconductor junction diodes? Is it related to breakdown voltage?
Paakhi
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1
vote
0 answers
Calculate the Thermal Resistance (Junction to ambient) from Thermal Resistance (Junction to mounting base)
I have this MOSFET - MOSFET Datasheet
I want to calculate the maximum junction temperature of the MOSFET part. I have calculated the power dissipation.
In the MOSFET datasheet, there is only Thermal Resistance (junction to mounting base) parameter…
user220456
1
vote
3 answers
Failed to plot junction capacitance versus reverse voltage in LTspice
The 1N4001 diode's junction capacitance versus reverse voltage plot is given as follows:
I guess to measure this capacitance they applied 1MHz 50mV pk-pk sine wave signal as reverse biased and varied the DC reverse bias from 100mV to 100V(?).
I…
user16307
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