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Why is the voltage high?

NA.1067
Associate

I’ve bought 1000+ L7805CP voltage regulators. On all the data sheets it say there is a +-10% voltage tolerance yet the voltage I’m getting is +55%. It says it’s input voltage range is 35v - 7v and its output is a nominal 5v (4.5-5.5v) yet I’m getting 7.85vdc. My power source is a 28.8v battery. Is this just a faulty batch?

thanks.

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