RS8051XF Non-Unity Gain, Rail-to-Rail I/O CMOS Operational Amplifier

RS8051XF vs. TLV379 / OPA379 / MCP6421 / MCP6141: High-Precision Single Op Amp Comparison

The RS8051XF is a single-channel, low-power, high-precision CMOS operational amplifier optimized for sensor signal conditioning, battery-powered devices, and portable medical and industrial equipment. It is a compelling alternative to industry-standard op amps such as TLV379, OPA379, MCP6421, and MCP6141. The comparison below highlights how RS8051XF stands out in critical areas such as offset voltage, input bias current, bandwidth, and power consumption.

1. Input Offset Voltage (Vos)

• RS8051XF: ±25 μV (typical), ±100 μV (max)

• OPA379: ±150 μV (typical), ±300 μV (max)

• TLV379: ±300 μV (typical), ±700 μV (max)

• MCP6421: ±150 μV (typical), ±500 μV (max)

• MCP6141: ±3 mV (typical)

✅ Advantage: RS8051XF delivers best-in-class precision, ideal for high-accuracy applications where drift and offset directly impact performance.

2. Input Bias Current

• RS8051XF: 0.2 pA (typical)

• OPA379 / TLV379: ~1 pA

• MCP6421: ~1 pA

• MCP6141: ~1 pA

✅ Advantage: The ultra-low input bias current of RS8051XF ensures minimal loading of high-impedance sources such as photodiodes and sensor outputs.

3. Gain Bandwidth Product (GBP)

• RS8051XF: 2.5 MHz

• OPA379: 90 kHz

• TLV379: 90 kHz

• MCP6421: 550 kHz

• MCP6141: 100 kHz

✅ Advantage: RS8051XF significantly outpaces competitors in bandwidth, enabling faster signal acquisition and response, particularly in filter, control loop, and ADC driver applications.

4. Quiescent Current (per channel)

• RS8051XF: ~280 μA

• OPA379 / TLV379: ~2.9 μA

• MCP6421: ~450 μA

• MCP6141: ~45 μA

⚖️ Comparison: While TLV379/OPA379 offer ultra-low power, their low bandwidth and high Vos limit precision use. RS8051XF balances low power with superior performance, making it ideal for systems requiring both accuracy and moderate bandwidth.

5. Voltage Noise Density

• RS8051XF: 25 nV/√Hz

• OPA379: ~50 nV/√Hz

• TLV379: ~50 nV/√Hz

• MCP6421: 22 nV/√Hz

• MCP6141: 35 nV/√Hz

⚖️ Comparison: RS8051XF delivers competitive low-noise performance, critical for maintaining SNR in precision analog front ends.

6. Rail-to-Rail Input/Output

• All devices: Support rail-to-rail input and output

• ✅ RS8051XF maintains full-range linearity and swing*, even near supply rails, especially important in low-voltage (1.8V–5.5V) systems.

✅ RS8051XF vs. Competitors: Specification Summary

🔧 Ideal Applications for RS8051XF

• Sensor signal conditioning (thermistors, photodiodes, strain gauges)

• Battery-powered precision systems

• Low-drift instrumentation amplifiers

• High-impedance front-ends for ADCs

• Medical and industrial monitoring devices

🎯 Why Choose RS8051XF?

The RS8051XF offers a unique combination of high DC precision, ultra-low input bias current, and excellent bandwidth, positioning it as a drop-in performance upgrade for designs currently using TLV379, OPA379, MCP6421, or MCP6141.

Whether you're designing for accuracy-critical portable devices or precision analog front-ends with limited power budgets, RS8051XF delivers unmatched value in precision, performance, and efficiency.