SGM80581XS8G/TR Rail-to-Rail Output CMOS Operational Amplifiers

Product Comparison: SGM80581XS8G/TR vs. ADA4891-1ARZ / ADA4891-1ARZ-R7

1. Power Consumption and Efficiency
The SGM80581XS8G/TR features a low quiescent current of 1.1mA (typical), which is substantially more power-efficient than the ADA4891-1ARZ, whose quiescent current typically reaches 3.5mA. This results in a nearly 70% reduction in power consumption, directly benefiting portable and battery-powered systems where thermal efficiency and extended battery life are critical.

2. Supply Voltage Range and Design Flexibility
SGMICRO’s SGM80581XS8G/TR operates over a wide single-supply range of 2.5V to 5.5V, offering excellent flexibility for both low-voltage and 5V analog systems. By comparison, ADA4891-1ARZ operates from ±2.5V (5V total), with limited single-supply compatibility. The broader supply range of SGM80581 enables simplified power architecture and easier integration in modern low-voltage designs.

3. High-Speed Performance
SGM80581XS8G/TR achieves a 120MHz gain-bandwidth product and a 45V/μs slew rate, closely matching the ADA4891-1ARZ, which delivers 130MHz GBW and a 55V/μs slew rate. While ADA4891 offers slightly faster specs, the SGM80581XS8G/TR delivers near-equivalent performance with significantly better power efficiency, giving it a superior performance-per-milliwatt ratio, ideal for compact, energy-sensitive analog front-ends.

4. Output Range and Rail-to-Rail Capability
A significant functional advantage of SGM80581XS8G/TR is its true rail-to-rail output, maximizing dynamic range and ensuring full utilization of the power supply voltage. ADA4891-1ARZ lacks true rail-to-rail output capability, limiting its signal swing—especially under low supply conditions. This makes SGM80581XS8G/TR better suited for precision applications operating near supply rails, such as ADC drivers and sensor interfaces.

5. Input Noise Performance
The ADA4891-1ARZ achieves an excellent low voltage noise of 1nV/√Hz, making it slightly more suitable for ultra-low-noise designs like instrumentation and medical analog chains. The SGM80581XS8G/TR, with a 3.5nV/√Hz noise density, still maintains solid low-noise characteristics that are more than sufficient for most high-speed signal chains, especially in consumer and industrial systems where total power and cost are larger constraints.

6. Packaging, Pinout, and Integration
The SGM80581XS8G/TR is offered in the industry-standard 8-lead SOIC (SOP-8) package, which is pin-compatible with ADA4891-1ARZ / ARZ-R7. This allows for easy drop-in replacement without PCB changes. For design engineers, this supports rapid prototyping, second-sourcing strategies, and seamless transition between vendors without compromising board layout or signal integrity.

7. Value and Availability
SGMICRO’s SGM80581XS8G/TR provides a cost-effective high-performance alternative with better supply assurance and regional support. In contrast, the ADA4891-1ARZ series—though high-performance—can face supply volatility and lead-time fluctuations. SGMICRO ensures stable production cycles and competitive pricing, which is crucial for mass production, cost-sensitive applications, or long-lifecycle designs.

Conclusion
The SGM80581XS8G/TR delivers excellent high-speed analog performance while dramatically improving power efficiency, supporting a wide supply range, and achieving rail-to-rail output—all at a more cost-effective and supply-stable advantage compared to ADA4891-1ARZ / ARZ-R7. For engineers looking to balance performance, power, and value, SGM80581XS8G/TR is an ideal alternative in applications such as video drivers, portable instrumentation, and high-speed signal acquisition systems.