Ultra-compact CMOS op amp delivers industry-leading ultra-low circuit current

ROHM’s ultra-compact CMOS op amp – TLR1901GXZ – achieves the industry’s lowest operating circuit current. This IC is optimised to be applied as a measurement sensing amplifier in size-constrained applications such as handheld measurement instruments, wearable devices, and indoor motion detectors.

As demand for more sophisticated control in battery-driven devices continues to increase, the importance of sensors that detect parameters such as temperature, humidity, vibration, pressure, and flow rate, along with the op amps used to amplify these sensor signals, also rises. At the same time, greater miniaturisation and energy savings in applications are a necessary step to realising a sustainable society, placing similar demands on individual devices as well.

In response to these evolving market needs, the company has advanced its process, packaging, and proprietary Nano Energy circuit technologies to develop an op amp that meets three key requirements: lower power consumption, higher accuracy, and compact size. The newly developed TLR1901GXZ achieves an ultra-compact footprint of less than 1mm2 by adopting a WLCSP with a fine ball pitch of 0.35mm while delivering an industry-leading low operating current of 160nA (typ.). This not only contributes to high-density mounting in space-constrained applications but also significantly extends battery life.

Moreover, the TLR1901GXZ features an extremely low input offset voltage of just 0.55mV (max.), one of the best among ultra-low current op amps. This represents an approximate 45% reduction compared to typical products on the market. A maximum input offset voltage temperature drift of 7µV/C ensures high accuracy operation over the operating temperature range.

Design flexibility can be further enhanced by pairing the op amp with ROHM’s ultra-compact general-purpose resistors, such as the MCR004 (0402 metric / 01005 inch) and MCR006 (0603 metric / 0201 inch), for applications like gain adjustment. The MCR004 series lineup includes the MCR004E – an environmentally friendly, fully lead-free option designed to support sustainable designs. Adapter boards featuring SSOP5 package ICs are offered as well to support initial evaluation and replacement assessments.

Application Examples include:

• Consumer devices: wearables, smart devices, motion sensors, etc.
• Industrial equipment: gas detectors, fire alarms, handheld measurement instruments, loggers, environmental sensors for IoT, etc.