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| High temperature part suggestion |
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| MagicSmoker:
--- Quote from: ali_asadzadeh on December 10, 2019, 07:27:30 am ---I want to design a data logger with a 170C working parts for a customer... ...the whole system should work with a single 3.7V Li-ion battery for 3 days(72hours) ... DO we have chinese parts? --- End quote --- Do you do ANY work yourself, or do you outsource everything to this forum? The only components made that are likely to tolerate operation at 170C are resistors and SiC MOSFETs and diodes. Molten salt batteries might be okay at 170C (might actually need to be hotter than that) but certainly nothing with a Li-ion chemistry. No MCUs are rated for >125C that I am aware of, but if there are any then they certainly won't be some cheap-ass Chinese parts like you are so fond of demanding we find for you. |
| mzzj:
--- Quote from: MagicSmoker on December 10, 2019, 02:36:42 pm --- --- Quote from: ali_asadzadeh on December 10, 2019, 07:27:30 am ---I want to design a data logger with a 170C working parts for a customer... ...the whole system should work with a single 3.7V Li-ion battery for 3 days(72hours) ... DO we have chinese parts? --- End quote --- Do you do ANY work yourself, or do you outsource everything to this forum? The only components made that are likely to tolerate operation at 170C are resistors and SiC MOSFETs and diodes. Molten salt batteries might be okay at 170C (might actually need to be hotter than that) but certainly nothing with a Li-ion chemistry. No MCUs are rated for >125C that I am aware of, but if there are any then they certainly won't be some cheap-ass Chinese parts like you are so fond of demanding we find for you. --- End quote --- Try hard-er https://aspencore.us.janrainsso.com/static/server.html?origin=https%3A%2F%2Fwww.embedded.com%2Ffloating-point-microcontroller-for-extreme-temperatures-up-210-c%2F |
| MagicSmoker:
--- Quote from: mzzj on December 10, 2019, 02:50:56 pm ---... Try hard-er ... --- End quote --- Why should I? I'm not the one trying to design something that works at 170C in an oil well bore hole for as cheap as possible. |
| David Hess:
The battery is going to be a major problem unless you use one with a special chemistry and construction intended for high temperature operation. Parts typically derate to 0 power by the time they reach 150C so be as conservative as possible with power and voltage derating. Watch out for leakage in precision circuits. What I would do is qualify parts by manufacturer and perhaps even lot for extended operation at 170C or actually a little higher. Destructive testing should give some idea of the reliability over temperature. |
| Gyro:
Sorry to say that people who know how to design circuits that can run at 170'C will already be working for companies making borehole logging equipment or similar. They will have access to a great deal of internal company hard-won knowledge and experience. As an 'outsider', you have very little chance of pulling it off successfully. |
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