Depends exactly what you’re looking for but so far we’ve used 100,000s of parts from these companies without issue: Wuxi NCE Power, Oriental Semiconductor Group, Panjit, Suzhou Changjiang Electronics (JCET)
Thanks. Looking for reliable manufacturers for production use. For exmaple 2n7002 is available from a ton of manufacturers on LCSC and the non western brands can be a lot cheaper. Not having used these manufacturers before Im wondering how the same parts can be cheaper and if they are the same quality.
I don't really know why they are cheaper. Could be something harmless like lower company overhead and/or streamlined supply chain or something worse like unethical sourcing of raw material and/or poor environmental practices. Could be that the western brands are just taking way more profit per part. But, I really don't want to make baseless claims.
There are lot of fabless start-ups, which may be okay, but really can't say for sure...unknown track record, unknown quality system, etc. For that reason, I think the big Chinese/Taiwanese brands are your best bet. Still have the cost advantage, while also having a name and reputation to defend.
For generic diodes, small signal transistors, etc., we uses a lot of Panjit. For high voltage MOSFETs, we use a lot Oriental Semiconductor. For low and medium voltage MOSFETs, we use a lot of NCE Power parts. Of course, these brands don't always have the solution you need. It seems that Infineon (et. al.) are typically ahead of the Chinese brands by 2-3 years in terms of technology. We still use lots of Infineon, ST, etc..