Are there's differences in technology/design/fab between them?
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Both die are exactly the same. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C. This means that the UC184x devices are able to meet all the parameters specified in the data sheet over a wider temperature range compared to UC284x devices.