The UTC M2115 is a low operating Voltage(1.0V min.) and low saturation output voltage( 2.0V p-p at supply voltage 2.5V) operational amplifier. It is applicable to handy type CD,radio cassete CD, and portable DAT, that are digital audio apparatus which require the 5V single supply operation and high output voltage. The UTC M2115 is improved version of the UTC M2100 about BIAS-CIRCUIT. So the UTC M2115 is low saturation compared to the UTC M2100 under the condition of low supply voltage(< 2.5V).The UTC M2115 is stable about the oscillation compared to the UTC M2100 under the condition of V+/V- >2.5V.