Nexgen Vishay Siliconix Gen4 Mosfets can they be used for audio? - diyAudio
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Old 1st January 2013, 10:20 PM   #1
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Default Nexgen Vishay Siliconix Gen4 Mosfets can they be used for audio?

TrenchFET Gen IV MOSFETs - Vishay/Siliconix | DigiKey
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Old 2nd January 2013, 12:18 AM   #2
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The spec seems to suggest not as it only lists switching systems.

However vertical and lateral mosfets are commonly used in amplifiers.
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Old 2nd January 2013, 02:09 AM   #3
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reading the pdf datasheet seems to say that these are specifically limited to VERY fast switching applications at unusually low voltages. The current draw seems high, but it is for milliseconds. Linear operation does not seem to be an option.

Also, I didn't look to see if there are complementary pairs.
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Old 2nd January 2013, 02:27 AM   #4
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for linear you actually want some Rdson- small milliOhm values are a bad sign
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Old 4th January 2013, 09:51 AM   #5
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Certain types of architecture of vertical fets are not suitable for analog operation. Trench-types are not suitable mostly because they actually have a secondary breakdown like feature and will hot spot and fail. Also Cgd becomes very large at Vds saturation with these devices. Uni-fet is another unsuitable canidate. Look for the differences in capacitance curves along with Rds-on for the different types of devices. Generally, the cellular devices, like Hexfets are more suitable for analog purposes. Also Planer Stripe type fets are very rugged for analog uses, but notice the increased dependency of Vgs vs Id upon Vds for these. I use these with excellent results but only with somewhat sophisticated error correction.
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