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Two transistors of the same type, {such as two bipolar NPN, or two bipolar PNP, or two enhancement N MOSFET,} which by either manufacture, selection, or both have similar characteristics. The closer the characteristics, the better the match. The most important is input matching, both at 25 degrees C and through the use temperature range. This is perhaps best done by making them together, next to each on a single die. The second most important characteristic for bipolars is Beta (hFE also hfe)), the forward static and dynamic current gain, or for FET's forward transconductance. Breakdown properties are not important as the pair can be rated for the lowest breakdown. Matched transistors are needed for balanced differential stages (normally used for amplifier inputs) and for bridges.

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