The LMC6035 and LMC6036 (LMC603x) are economical, low-voltage op amps capable of rail-to-rail output swing into loads of 600Ω. The LMC6035 is available in a chip-sized package (8-bump DSBGA) using micro SMD package technology. Both devices allow for single-supply operation and are specified for 2.7V, 3V, 5V, and 15V supply voltage. The 2.7V supply voltage corresponds to the end-of-life voltage (0.9V/cell) for three NiCd or NiMH batteries in series, making the LMC603x an excellent choice for portable and rechargeable systems. These devices also feature a well behaved decrease in specifications at supply voltages less than the specified 2.7V operation. This behavior provides a comfort zone for adequate operation at voltages significantly less than 2.7V. The ultra-low input current makes these devices an excellent choice for low-power, active-filter applications because a low input bias current allows the use of higher resistor values and lower capacitor values. In addition, the drive capability of the LMC603x makes these op amps an excellent choice in a broad range of applications for low-voltage systems.