SGM8551
Ultra-low offset precision op-amp with 5uV max offset voltage, rail-to-rail I/O, and wide supply range of 2.5V to 5.5V.
Product Overview
Description
The SGM8551 is a high-precision operational amplifier featuring ultra-low input offset voltage of just 5uV maximum.
With rail-to-rail input and output capability, this op-amp maximizes dynamic range in single-supply applications.
The device operates from 2.5V to 5.5V supplies, making it ideal for portable and battery-powered equipment.
Product Series
SGM
Primary Application
Sensor signal conditioning
Key Features
- Ultra-low offset voltage: 5uV max
- Rail-to-rail input and output
- Low quiescent current: 180uA
- Wide supply range: 2.5V to 5.5V
- Excellent PSRR and CMRR
Specifications
| Supply Voltage | 2.5V - 5.5V |
|---|---|
| Offset Voltage | 5uV (max) |
| Bandwidth | 1.5MHz |
| Slew Rate | 0.9V/us |
| Noise Density | 25nV/sqrt(Hz) |
| Package | SOT-23-5, MSOP-8 |
Applications
Sensor signal conditioning
Sensor signal conditioning
Medical instrumentation
Medical electronics
Precision data acquisition
Data acquisition and conversion
Current sensing
Electronic system design
Battery-powered equipment
Battery and charging management
FAE Expert Insights
"The SGM8551 is an excellent choice for precision measurement applications where DC accuracy is critical. In my experience supporting industrial sensor designs, the 5uV offset specification provides significant advantages over general-purpose op-amps. I particularly recommend this device for thermocouple amplifiers and strain gauge signal conditioning where microvolt-level signals must be accurately amplified. The rail-to-rail I/O capability is valuable for maximizing ADC dynamic range in single-supply systems. For best performance, I recommend proper PCB layout with guard rings around high-impedance nodes and careful attention to thermal gradients."
Exceptional precision for sensor applications with ultra-low offset voltage
— Michael Chen, BeiLuo
Frequently Asked Questions
What is the maximum operating temperature for the SGM8551?
The SGM8551 is rated for industrial temperature range of -40C to +125C. This wide temperature range makes it suitable for industrial, automotive, and outdoor applications. The offset voltage drift is typically 0.03uV/C, ensuring stable performance across the temperature range. For high-temperature applications, proper PCB thermal design is recommended to minimize self-heating effects.
For extended temperature applications, verify your system operating range is within -40C to +125C. Contact us for automotive-grade options.
Can the SGM8551 operate with a single 3.3V supply?
Yes, the SGM8551 is fully specified for single-supply operation from 2.5V to 5.5V. At 3.3V supply, the op-amp maintains rail-to-rail input and output capability, allowing maximum signal swing. The common-mode input range extends 100mV beyond the supply rails, and the output can swing within 10mV of the rails under light loads. This makes it ideal for 3.3V microcontroller systems and portable battery-powered applications.
The SGM8551 is well-suited for 3.3V single-supply designs. Ensure your load requirements are within the output drive capability.
What is the recommended PCB layout for the SGM8551?
For optimal performance with the SGM8551: 1) Place decoupling capacitors (0.1uF ceramic) close to the power supply pins; 2) Use guard rings around high-impedance input traces to minimize leakage currents; 3) Keep input traces short and shielded from digital noise sources; 4) Use a solid ground plane to reduce noise pickup; 5) Avoid thermal gradients across the package that could create thermocouple effects. For precision applications, consider using a four-layer PCB with dedicated ground and power planes.
Follow these layout guidelines for best precision performance. Contact our FAE team for layout review services.
How does the SGM8551 compare to the OPA333 in terms of performance?
The SGM8551 and OPA333 are both precision op-amps with similar applications. The OPA333 offers slightly better offset voltage (2uV vs 5uV) and lower voltage operation (down to 1.8V), but has significantly lower bandwidth (350kHz vs 1.5MHz). The SGM8551 provides better AC performance with wider bandwidth and faster slew rate, making it more suitable for applications requiring both DC precision and AC response. For pure DC measurement, the OPA333 has a slight edge, while the SGM8551 is better for mixed-signal applications.
Choose SGM8551 for applications requiring both precision and bandwidth. Choose OPA333 for ultra-low offset DC-only applications.
What types of sensors work well with the SGM8551?
The SGM8551 is ideal for amplifying low-level sensor signals due to its ultra-low offset voltage. Excellent applications include: thermocouples (type K, J, T) producing microvolt-level signals, strain gauges in bridge configurations, pressure sensors with mV outputs, current sense resistors for low-side and high-side sensing, and photodiode transimpedance amplifiers. The low offset ensures that the amplified signal accurately is the sensor output without introducing significant DC error.
The SGM8551 is recommended for any sensor application where microvolt-level accuracy is required. Contact us for specific sensor interface recommendations.