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TL103WA ckt problem

Other Parts Discussed in Thread: TL103WA, TL072, LM358


I am using channel 2 of TL103WA as a unity gain buffer (non-inverting). Vcc is 5V, Vee is gnd.

The input is 0.45V. The output of the buffer is connected to junction of an 8.5K resistor and a 1k resistor. See attachment.

The opamp is sinking current of about 50uA. The intersection of 8.5k and 1k form a resistor divider. The voltage at the intersection is 0.5V.

I tried to calculate the output impedance of the opamp. (0.45-0.5)/50uA = 1Kohms !!??

I don't get it. Opamps usually have output impedance in the range of 100-200 ohms. Whats wrong here?