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BUY LM239J https://www.utsource.net/itm/p/527378.html
Low Power Low Offset Voltage Quad Comparators
Description: LM239J is an operational amplifier with four independent high gain internally frequency compensated operational amplifiers. Features: * Low supply current drain (800 μA) * Low input offset voltage * Low input bias current * Low input offset current * High common mode rejection ratio * High open loop gain Applications: * Active filters * Sample and hold circuits * Voltage followers * Peak detectors * Instrumentation amplifiers * Logarithmic amplifiers * Precision rectifiers (For reference only)