Rohm is claiming “industry’s first high-speed op-amp that eliminates oscillation due to load capacitances” for its 10V/μs BD77501G – which is not quite true unless some further caveats are added as, for example, ADI’s ‘C-Load’ op-amps are stable with any capacitance – LT1364 can hit 1,000V/μs. Rohm’s branding for capacitive tolerance is ‘Nano Cap’.

BD77501G is a ground sense CMOS op amp – input common-mode range is Vss to Vdd-2V and it operates from a single supply of 7 to 15V, or dual ±3.5 to ±7.5V rails.

Most parameters are specified at 12V 25°C (operation is across -40 to +85°C).

Rohm-BD77501GInput offset is typically within ±4mV and it comes in a 2.9 x 2.8 x 1.25mm package.

Noise immunity

The company emphasises noise immunity for industrial use

“Degradation of the noise environment resulting from increased electrification and mounting density is making it extremely difficult to implement noise design for small-signal devices,” said Rohm. “In response, Rohm developed the Emarmour series of op-amps and comparators that have been well-received in the automotive and industrial markets due to its superior noise immunity.”

Emarmour branding means that output voltage fluctuation is limited to better than ±300mV across the noise frequency band when tested to ISO11452-2.

With this op-amp, the company is claiming well under this. Noise-bucking techniques include internal RC filters on all pins. It “achieves unprecedented noise immunity that limits variation to less than ±20mV. This eliminates the need for filter circuits for each noise frequency”, said Rohm.

Samples are available now, with OEM quantities scheduled for October.

Application are expected in facility management equipment such as abnormal current and gas detectors, motor controls, inverter controls and pre-drive buffers for power transistors.