As the "signal conditioning hub" of electronic systems, operational amplifiers are indispensable in portable devices, industrial sensing, and medical equipment. However, three core pain points in practical applications—low power consumption versus battery life, signal distortion from high source impedance, and stability under harsh environments—often become critical bottlenecks constraining system performance. The CBM8541/CBM8542/CBM8544 series of operational amplifiers from Corebai Electronics delivers an efficient solution through its core features: flexible single/double/quad channel configuration, rail-to-rail input/output, and industrial-grade wide-temperature design.

1、Scene pain points: three core requirements restrict signal amplification performance

As the "signal conditioning hub" of electronic systems, operational amplifiers (OAs) are widely used in portable devices, industrial sensing, and medical equipment. However, three core challenges persistently hinder their performance improvement: 1) Battery-powered portable devices suffer from short battery life due to high power consumption of conventional OAs; 2) Limited output dynamic range at 2.7~3.7V low voltages and signal amplification distortion under weak signals; 3) In high-impedance scenarios like industrial sensors using integrators or piezoelectric sensors, standard OAs exhibit excessive input bias currents that cause signal drift and long-term measurement errors, failing to meet industrial-grade precision requirements. Furthermore, in harsh environments such as high-temperature workshops or outdoor monitoring, standard commercial OAs often experience performance degradation within the-40℃ to +125℃ wide temperature range due to weak electrostatic resistance and susceptibility to interference-induced damage.

2、Technical adaptation: three core features accurately match the needs of the scene

To address the above pain points, CBM8541/CBM8542/CBM8544 series achieves accurate correspondence between scenario requirements and performance through differentiated technical design:

1. Low power + rail to rail design: solve the problem of portable device battery life and dynamic range

Using CMOS process, it has the characteristics of low power consumption. The typical value of static current (IQ) of each amplifier is only 45μA at 5V power supply, and the typical value is 35μA at maximum 70μA;2.7Vpower supply, and 55μA at maximum power supply, which is only 1/5-1/10 of the traditional amplifier, greatly reducing the power consumption.

Supports 2.7V~5.5Vsingle power supply, covering the power supply domain of mainstream portable devices such as lithium battery and USB, without additional power conversion circuit, simplifying the power supply design.

This 5V-powered system employs a rail-to-rail input-output architecture with 1mA load current. The high-level output (VOH) typically reaches 4.965V (minimum 4.9V), while the low-level output (VOL) ranges from 25mV to 100mV;2.7V maximum 100mV. When powered, the VOH reaches 2.65V (minimum 2.575V) and VOL reaches 35mV (maximum 100mV). The output amplitude closely matches the power rail, delivering a dynamic range over 30% better than conventional amplifiers and enabling full-signal amplification of weak signals.

2. Low offset current + high precision: solve the distortion of high source impedance signal

The input bias current (IB) is controlled at 4pA typical and 60pA maximum, and the input offset current (IOS) is 0.1pA typical and 30pA maximum. The voltage drop generated on high source impedance is minimal and can be ignored to reduce signal distortion.

The typical input offset voltage (VOS) is 1mV and the maximum is 6mV. The typical offset voltage temperature drift (ΔVOS/ΔT) is 4μV/℃. Within a wide temperature range of -40℃ to +125℃, the total offset voltage drift is only 0.66mV, ensuring that the long-term measurement accuracy meets industrial-grade requirements.

The common mode rejection ratio (CMRR) is 48dB under typical 50dB, 2.7V power supply at 5V, which can effectively suppress the common mode interference such as power fluctuation and environmental noise, and improve signal fidelity.

3. Wide temperature and high reliability: to meet the challenges of harsh environments

The operating temperature range covers-40℃ ~ +125℃, and the storage temperature and junction temperature range are-65℃ ~ +150℃, which can be stably applied to various harsh temperature scenarios.

In the range of-40℃~+125℃, the static current increases from 45μA to 55μA when the power supply is 65μA,2.7V, and the change amplitude is less than 45%. The power consumption and performance are stable under wide temperature.

The anti-static capability is up to HBM (human discharge mode) 5000V and MM (machine discharge mode) 400V, which can resist the static interference in industrial scenarios.

The thermal resistance of different packages is optimized, such as SOP-8 package thermal resistance 120℃/W and TSSOP-14 package thermal resistance 112℃/W. The heat can be quickly conducted at high temperature to avoid overheating damage of devices.

3、Test verification: electrical characteristics and environmental adaptability

1. Measured performance of core electrical parameters

Under standard test conditions of 25℃ room temperature, 5V power supply and 2.5V common mode voltage:

Dynamic Performance: The Gain Bandwidth Product (GBP) typically reaches 1 MHz, capable of handling industrial sensor signals (typically <100kHz) and low-rate signal amplification requirements for portable devices. With a slew rate (SR) of 0.7V/μs and a response time (ts) of 6μs (0.1% accuracy) for a 1V step signal, it enables rapid response to dynamic signal variations from sensors, effectively eliminating data latency.

Noise characteristics: The input voltage noise density is typical 42nV/√Hz at 1kHz and 38nV/√Hz at 10kHz. The low noise characteristics can reduce signal interference in medical equipment (such as electrocardiogram monitoring) and industrial sensing, and improve data accuracy.

Open-loop gain: In the load and output voltage 0.5~2.2V range of 100kΩ, the open-loop voltage gain (AVO) is typically 42V/mV to ensure linearity and avoid distortion when amplifying small signals.

Under the low power supply condition of 2.7V, the product performance changes only slightly: GBP typical 0.98MHz, SR typical 0.7V/μs, AVO typical 500V/mV, proving that high precision and dynamic performance can be maintained under low voltage, which is suitable for the low power supply scenario of portable devices.

2. Environmental adaptability test

From the typical characteristic curve, we can see that:

Temperature stability of input bias current: when the temperature rises from-40℃ to +125℃, the input bias current increases from 1pA to 10pA, which is still far below the maximum limit of 60pA. The accuracy under high source impedance scenario is not affected by temperature, which is suitable for industrial wide temperature sensing requirements.

Temperature adaptability of output capability: When the temperature rises from-40℃ to +125℃, the output drain current (SinkCurrent) and source current (SourceCurrent) fluctuate only slightly. The output current can still maintain more than 25mA when the power supply is 5V, ensuring stable load drive capability without additional buffer circuit.

Phase margin and stability: When the frequency increases from 10Hz to 10MHz, the phase margin (PM) is typical 67°(5V), 63°(2.7V), there is no risk of self-oscillation, and the closed-loop operation is stable, which is suitable for complex circuit environment in industrial control.

4、Value of landing: efficiency improvement and cost optimization in multiple industry scenarios

CBM8541/CBM8542/CBM8544 series brings clear implementation value for consumer electronics, industrial, medical and other industries through the combination of "performance adaptation + flexible packaging + high reliability":

1. Consumer electronics: Extend the battery life of portable devices and simplify small design

The product series offers ultra-compact packaging solutions including SOT23-5 and SC70-5 (e.g., CBM8541ASC7 uses SC70-5 packaging with a size of just 1.8~2.2mm×1.15~1.35mm). These components can be embedded in smartwatches, wireless sensors, and other micro-devices, saving over 30% of PCB space. With a low static current of 45μA, the 2000mAh lithium battery-powered sensor terminals achieve four times longer battery life, reducing users' charging frequency and enhancing product competitiveness.

2. Industrial sensing: improve measurement accuracy, reduce system cost

The CBM8542 (dual-channel) and CBM8544 (quadruple-channel) modules can replace two or four single-channel amplifiers. For example, industrial multi-parameter monitoring systems (temperature + humidity + pressure) using the CBM8544 quadruple-channel solution can reduce PCB area by 30% and component count by 50%, while simultaneously lowering power loss. The 4pA low bias current is compatible with piezoelectric sensors and photodiodes, eliminating the need for additional current-to-voltage conversion circuits. This simplifies design processes and reduces system costs.

3. Medical and harsh environments: ensure reliability and meet industry standards

The series features a-40℃ to +125℃ wide temperature range, designed for medical device sterilization environments (e.g., high-temperature disinfection). Its 5000VESD protection prevents electrostatic damage during transportation, while low noise characteristics (42 nV/√Hz @1 kHz) minimize signal interference in ECG monitoring and blood glucose detection. A 1mV offset voltage ensures measurement errors below 0.5%, meeting medical equipment's high-precision requirements. Additionally, packaging options like TSSOP-14 and TDFN-3x3-16L accommodate miniaturization needs, enhancing product integration.