What you’ll learn:
- ROHM claims the lowest-power op amp available.
- Rail-to-rail operation on up to a 5.5-V supply.
- SSOT5 surface-mount packaging.
ROHM recently introduced the LMR1901YG-M op amp, designed for sensor amplifiers and battery-powered and portable devices. This AEC-Q100-qualified operational amplifier features leading ultra-low power consumption, low input-offset voltage, and rail-to-rail-capable inputs/output.
With its typical 160-nA supply current, the single-channel LMR1901YG-M has the company claiming the title to lowest-power general-purpose op amp, reducing power by 38% over the nearest competitor. Thus, it’s suitable for low-power remote sensing and portable applications. Power-rail current consumption is claimed to be invariant over the operating temperature range, though ROHM declined to provide details on how this was achieved.
The device can operate from single- or dual-polarity power supplies, spanning a total of 1.7 to 5.5 V, and has an operating temperature range of −40 to 105°C. ROHM didn’t provide a timeframe for when a −40 ~ 125°C automotive-grade part could be expected when asked. The parts will likely be test sorted at temperature, so maybe in a few quarters from now is a guess as they get more wafer lots through the fab.
Other key specifications:
- 0.55-mV maximum input offset voltage
- VSS to VDD common-mode “rail-to-rail” input-voltage range
- 0.5-pA typical input bias current
The LMR1901YG-M datasheet, and a Spice model for the device, can be found here, along with Spice decks for common op-amp circuits.
The device, packaged in an SMT SSOP5, is currently in stock (check inventory here) at leading distributors, with a 1kU budgetary distributor price of around $0.82 each.
Read more articles in the TechXchange: Exploring Op Amps.
