SGM8551
High-precision zero-drift op-amp with 5μV offset and rail-to-rail I/O for sensor interfaces
Product Overview
Description
The SGM8551 is a high-precision zero-drift operational amplifier featuring chopper-stabilized architecture.
With typical input offset voltage of only 5μV and near-zero drift, it is ideal for precision sensor interfaces.
The rail-to-rail input/output capability maximizes dynamic range in single-supply applications.
Product Series
SGM
Primary Application
Precision sensor interfaces
Key Features
- Zero-drift chopper-stabilized architecture
- Ultra-low 5μV input offset voltage
- Rail-to-rail input and output
- Low 0.05μV/°C offset drift
- 1.5MHz bandwidth
- Low 80μA quiescent current
Specifications
| Supply Voltage | 2.7V to 5.5V |
|---|---|
| Input Offset Voltage | 5μV (typ) |
| Offset Drift | 0.05μV/°C |
| Bandwidth | 1.5MHz |
| Slew Rate | 0.8V/μs |
| Quiescent Current | 80μA |
| Input Noise | 25nV/√Hz |
| Package | SOT-23-5, SOIC-8 |
Applications
Precision sensor interfaces
Sensor signal conditioning
Strain gauge amplifiers
Electronic system design
Thermocouple amplifiers
Electronic system design
Current sensing
Electronic system design
Electronic scales
Electronic system design
FAE Expert Insights
"The SGM8551 is my first choice for precision DC measurement applications. The chopper-stabilized architecture delivers exceptional accuracy that rivals much more expensive precision op-amps from major brands. I've successfully used this part in weigh scale applications where microvolt-level signal resolution was required. The 5μV offset specification is conservative - most units measure below 2μV in production. The rail-to-rail capability is genuine, with output swing within 10mV of the rails under light loads. I highly recommend it for any precision DC application where offset drift must be minimized."
Exceptional 5μV precision with near-zero drift for high-accuracy sensor interfaces
— Dr. Michael Chen, BeiLuo
Frequently Asked Questions
What is the typical input offset voltage of SGM8551?
The SGM8551 features a typical input offset voltage of 5μV at 25°C, with a maximum of 20μV over the full temperature range. This ultra-low offset is achieved through chopper-stabilized architecture. This ultra-low offset is achieved through chopper-stabilized architecture that continuously corrects offset errors. In production testing, most units measure below 2μV offset, making this op-amp suitable for precision measurement.
For applications requiring offset below 10μV, SGM8551 is an excellent choice.
How does the chopper-stabilized architecture work?
The SGM8551 uses auto-zero/chopper-stabilized architecture to achieve ultra-low offset. The internal circuitry continuously measures and corrects the input offset voltage, switching at approximately 10kHz.
Use SGM8551 for DC or low-frequency precision applications.
What PCB layout recommendations apply to SGM8551?
Place 0.1μF ceramic decoupling capacitors within 2mm of supply pins. Keep input traces short and symmetric. Use a solid ground plane under the op-amp. For optimal performance with SGM8551: Place 0.1μF ceramic decoupling capacitors within 2mm of the supply pins. Keep input traces short and symmetric to minimize noise pickup and parasitic capacitance.
Follow standard precision analog layout practices.
What is the noise performance of SGM8551?
The SGM8551 has input voltage noise density of 25nV/√Hz at 1kHz. The integrated noise over 10Hz to 10kHz bandwidth is approximately 2.5μV RMS. Due to the chopper architecture, the noise spectrum has two components: broadband noise similar to standard op-amps, and switching noise at the chopper frequency and its harmonics.
SGM8551 noise is optimized for DC/low-frequency applications.
Can SGM8551 operate on single supply?
Yes, the SGM8551 is designed for single-supply operation from 2.7V to 5.5V with rail-to-rail input/output capability. The rail-to-rail input/output capability allows the full supply range to be utilized for signal swing. Input common-mode range extends beyond both rails, and output can swing close to the rails.
SGM8551 excels in single-supply applications from 2.7V to 5.5V.