All Questions
Tagged with semiconductors thermal
14
questions
0
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110
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Understanding thermal instability breakdown in pn junctions
I am currently reading Sze (Physics of Semiconductor Devices, 3e, Chapter 2.4.1) and am trying to understand his discussion of thermal instability breakdown/runaway in pn junctions. I have also ...
- 1,161
1
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0
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88
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Coupling heatsink RC network to MOSFET's Cauer circuit
I am trying to understand simple RC thermal simulation to analyse the temperature rise in Rohm a 1200 V N-channel SiC MOSFET SCT3040KR.
RC Cauer parameters are as depicted in the LTspice circuit ...
- 21
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1
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54
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What does the interface between lead(s) and the silicon chip look like inside a semiconductor package?
For a leaded semiconductor, like a diode or a transistor, one of the leads is usually the same piece of metal as the copper pad/heat spreader on the back, which is also shorted to one of the junctions ...
- 749
1
vote
1
answer
117
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What is the type of material used for the casing of semiconductors?
I am trying to build some thermal models for leaded and surface-mount diodes and transistors.
Below is a picture of the TO-220 outline I got from the internet. What kind of material is the black part ...
- 749
1
vote
1
answer
173
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Clarification of 'case' in junction to case thermal resistance
Junction to case thermal resistance (Rjc) is a key parameter when characterizing a package. It can be expressed as the temperature difference between the two locations over the heat dissipation.
I am ...
- 749
2
votes
1
answer
217
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Compute the junction temperature for a bridge diode
Here is the datasheet:
I calculated the power dissipated through one of the 6 diodes according to this formula
$$P_d = U_\text{D0}\cdot I_\text{average} + R_{d}\cdot I_\text{rms}^2$$
Then, I would ...
- 2,434
7
votes
5
answers
1k
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What makes the value of the surface to case thermal resistance?
From the datasheet:
The datasheet notes that the case to heatsink thermal resistance is equal to 0.4 K/W. I do not know how they obtain this value as the thermal resitance depends at least on the ...
- 2,434
0
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1
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158
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Thermal impedance - what is the purpose?
If I want to compute the junction temperature of a component, I can by using its thermal resistance (case to junction) and if I know the power dissipated by the component and the temperature of the ...
- 2,434
0
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2
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2k
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Calculating chip junction temperature based on case temperature
As far as I know one can calculate a chip’s (Diode, Transistor..) junction temperature rise with the consumed power and the thermal resistance Rth.
Is there a way to calculate the junction ...
- 143
1
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1
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139
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How can you measure voltage differences less than thermal voltage (~26mV at room temp)?
If thermal voltage is the average voltage of any given electron relative to the voltage at ground state, and this presumably fluctuates, how can you make any measurement on a circuit more accurate ...
- 388
-1
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1
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100
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Fixing hot plate and the heat sink, which thermoelectric module would produce more power?
Thermoelectric coolers (TECs) are typically used to generate temperature difference. Thermoelectric generators (TEGs), however, are used for power generation. While TECs are much cheaper than TEGs, ...
- 101
3
votes
2
answers
576
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Heat dissipation in a DIP Solid State Relay
I am working on an application that switches a high power (15 W typical, 100 W maximum) resistive load at 230 VAC (RMS) from a 5 VDC control line. For this I plan to use a Solid State Relay. I am ...
- 73
3
votes
2
answers
3k
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Thermal Runaway in Diodes
Datasheet for 1N5406 diode states "3.0 ampere operation at Ta = 75°C with no thermal runaway".
What does this mean exactly? Can I place these in parallel to increase current capability?
- 531
5
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3
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Given metal dimensions and material, is it possible to determine the maximum current that the structure can handle? [semiconductor processing]
I have a linewidth structure that has very low resistance. I want to know the maximum current that this structure can handle.
Since the resistance of the metal is so low, it's hard to measure the ...
- 153