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[SOLVED] Why CMOS manufacturing is expensive than BJT?

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ckshivaram

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keith1200rs

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You need to compare like for like. A typical bipolar technology now would be fairly large geometry and you wouldn't get many devices within a given area. The state of the art CMOS would be packing many times the number of devices in the same area so while it may be more expensive for a given area you have a lot more devices within that area. So, price per transistor is lower for CMOS. However, inherently the bipolar process is simpler - fewer masks and fewer process steps.

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keith1200rs

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If I understand you question correctly, the answer is yes. Although it is not quite that simple, the drive to making larger wafers and smaller transistors results in a lower chip cost even though a single wafer can be very expensive. A single die could be as cheap as $0.03 depending on its size and could have a huge number of transistors on it. BUT you need to want a lot of them to justify the costs involved.

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