LM321-TR 1MHZ High Voltage Bipolar Opamp

Product Overview: LM321-TR vs. LM321MFX/NOPB

The LM321-TR is a low-power, precision operational amplifier designed for cost-sensitive applications where performance and efficiency are critical. It offers low offset voltage and a wide range of industrial applications, including sensors, signal processing, and audio equipment. Competing in the same space is the LM321MFX/NOPB from Texas Instruments, a low-power op-amp that also targets cost-sensitive designs. However, the LM321-TR offers distinct advantages in terms of offset voltage, power consumption, and overall cost-effectiveness.

Input Offset Voltage

The LM321-TR features a typical input offset voltage of 300 μV, which ensures reliable and accurate performance for most general-purpose applications. This low offset voltage allows it to be used in precision systems without the need for complex external calibration.

In comparison, the LM321MFX/NOPB has a typical input offset voltage of 500 μV, which is higher than that of the LM321-TR. While this is still acceptable for many applications, the LM321-TR provides a more precise solution, reducing the need for additional compensation circuits and improving accuracy in sensitive signal processing.

Power Consumption

The LM321-TR is designed to be highly efficient, with a typical supply current of 40 μA. This low supply current makes it ideal for battery-powered applications, where minimizing power usage is a top priority without sacrificing performance.

The LM321MFX/NOPB, on the other hand, has a typical supply current of 55 μA. While this is still relatively low, the LM321-TR offers a more efficient solution, extending battery life and reducing overall system power consumption.

Noise Performance

The LM321-TR offers a voltage noise density of 12 nV/√Hz at 1 kHz, which is beneficial in applications requiring low-noise performance, such as audio processing or precision measurement systems. This low noise ensures clean amplification, reducing signal interference and providing better overall system performance.

The LM321MFX/NOPB, in comparison, has a voltage noise density of 18 nV/√Hz at 1 kHz. While still suitable for many applications, the LM321-TR offers a significant improvement in noise performance, making it more suitable for noise-sensitive applications.

Bandwidth and Slew Rate

The LM321-TR features a gain-bandwidth product of 1 MHz and a slew rate of 0.3 V/μs, which is adequate for most low-speed applications. These specifications are optimized for stability and precision, making it ideal for signal conditioning and audio systems where high-speed performance is not a primary requirement.

The LM321MFX/NOPB offers a gain-bandwidth product of 1 MHz as well but has a slightly higher slew rate of 0.5 V/μs. While this provides faster response times, the LM321-TR is better suited for applications where stability and precision take precedence over speed.

Package and Pin Compatibility

The LM321-TR is available in a SOT-23-5 package, which is compact and ideal for space-constrained designs. Its small size and efficient performance make it well-suited for portable and cost-sensitive applications.

The LM321MFX/NOPB is available in an SOIC-8 package. While the larger package allows for easier handling in certain applications, the LM321-TR’s smaller package offers a clear advantage in designs where space is at a premium.

Cost Efficiency

The LM321-TR is priced very competitively at approximately $0.11 per unit (in small quantities), making it an excellent choice for high-volume applications where cost control is crucial.

In comparison, the LM321MFX/NOPB is priced around $0.25 per unit (digikey.com). This higher cost does not necessarily reflect a proportional performance improvement, making the LM321-TR a more cost-effective solution for many low-power and cost-sensitive designs.

Rail-to-Rail Input and Output

Both the LM321-TR and LM321MFX/NOPB feature rail-to-rail input and output capabilities, which is advantageous in low-voltage applications where maximizing the input and output voltage swing is essential.

Conclusion

The LM321-TR outperforms the LM321MFX/NOPB in several important areas, including input offset voltage, power consumption, and noise performance. Its lower input offset voltage and reduced power consumption provide distinct advantages in precision and battery-powered applications. Moreover, the LM321-TR’s superior noise performance ensures better signal clarity in sensitive applications.

Additionally, the LM321-TR offers a significant cost advantage, providing the same level of performance at a much lower price point than the LM321MFX/NOPB. This makes it an excellent choice for high-volume, cost-sensitive designs where both performance and cost-effectiveness are key considerations.

Overall, the LM321-TR offers a more precise, efficient, and cost-effective solution for low-power, high-performance applications compared to the LM321MFX/NOPB, making it the preferred choice for many engineers seeking optimal value without compromising on quality.