SGM80581XN5G/TR Rail-to-Rail Output CMOS Operational Amplifiers

Technical Comparison: SGMICRO SGM80581XN5G/TR vs. Analog Devices ADA4891-1ARJZ / ADA4891-1ARJZ-R7

1. Power Consumption and Quiescent Current Efficiency
The SGM80581XN5G/TR offers an impressively low quiescent current of just 1.1mA (typical), significantly outperforming the ADA4891-1ARJZ, which operates at a typical quiescent current of 3.5mA. This approximately 69% reduction in power consumption enables lower heat generation and extended battery life, making the SGM80581 ideal for power-sensitive applications such as portable instrumentation and sensor interfaces.

2. Wide Supply Voltage Range and Design Flexibility
SGM80581XN5G/TR supports a broad supply voltage range of 2.5V to 5.5V, which offers more flexibility in both low-voltage and standard analog supply environments. In contrast, the ADA4891-1ARJZ is limited to a ±2.5V (5V total) supply, offering slightly less headroom. This gives SGM80581XN5G/TR an advantage in modern low-voltage systems, especially in single-supply designs where flexibility is key.

3. Bandwidth and Slew Rate Performance
Both devices are high-speed amplifiers optimized for video and fast signal processing. The SGM80581XN5G/TR delivers a 120MHz gain-bandwidth product and a slew rate of 45V/μs, while the ADA4891-1ARJZ provides a 130MHz bandwidth and slew rate of 55V/μs. While ADA4891-1ARJZ is slightly faster on paper, the SGM80581 achieves near-equivalent performance with significantly lower power, yielding a better performance-per-watt ratio, which is critical in power-constrained designs.

4. Rail-to-Rail Output and Signal Swing
SGM80581XN5G/TR supports rail-to-rail output operation, maximizing dynamic range and ensuring full utilization of the supply rail. ADA4891-1ARJZ, while capable of outputting close to the rails, does not fully achieve rail-to-rail output performance. This makes SGM80581 a more robust choice in applications that require precise full-range signal output, particularly in single-supply systems.

5. Noise Performance
The ADA4891-1ARJZ has a lower input voltage noise density (1nV/√Hz) compared to the SGM80581XN5G/TR’s 3.5nV/√Hz, giving it an edge in ultra-low-noise applications. However, for the vast majority of general-purpose high-speed designs, SGM80581's noise performance remains well within acceptable ranges, especially when balanced against its superior power efficiency and lower cost.

6. Package and Integration Considerations
Both products are available in compact SOT-23-5 (5-pin) packages, making them drop-in compatible for most layouts. This enables straightforward replacement of ADA4891-1ARJZ with the SGM80581XN5G/TR in many existing designs, while reducing overall BOM costs and power budget.

7. Cost Efficiency and Supply Chain Benefits
SGMICRO’s SGM80581XN5G/TR offers outstanding price-performance ratio, making it an ideal choice for volume production. Additionally, SGMICRO’s robust local support, stable supply chain, and competitive lead times provide significant advantages over global alternatives such as the ADA4891-1ARJZ series, which may face longer delivery cycles and higher cost volatility.

Conclusion
The SGM80581XN5G/TR delivers competitive high-speed analog performance with dramatically lower quiescent current, rail-to-rail output, and greater supply voltage flexibility, making it a compelling alternative to Analog Devices’ ADA4891-1ARJZ / R7. For designers seeking an efficient, cost-effective solution with excellent analog performance in a compact form factor, the SGM80581XN5G/TR stands out as a smart and practical choice.