TP1561
Ultra-low offset precision op-amp with 50μV max offset, rail-to-rail I/O, ideal for sensor signal conditioning.
Product Overview
Description
The TP1561 is a high-precision operational amplifier featuring ultra-low offset voltage of 50μV maximum.
With rail-to-rail input and output, low noise, and excellent stability, it is ideal for precision sensor signal conditioning and instrumentation applications.
The device operates from 2.5V to 5.5V single supply and offers low quiescent current for power-sensitive applications.
Product Series
TP
Primary Application
Sensor signal conditioning
Key Features
- Ultra-low offset voltage: 50μV max
- Rail-to-rail input and output
- Low noise: 25nV/√Hz at 1kHz
- High open-loop gain: 120dB
- Wide supply range: 2.5V to 5.5V
- AEC-Q100 qualified (automotive grade)
Specifications
| Offset Voltage | 50μV max |
|---|---|
| Offset Drift | 0.5μV/°C |
| Bandwidth | 2.5MHz |
| Slew Rate | 1.5V/μs |
| Supply Voltage | 2.5V to 5.5V |
| Quiescent Current | 450μA per channel |
| Package | SOT23-5, SOIC-8 |
Applications
Sensor signal conditioning
Sensor signal conditioning
Instrumentation amplifiers
Electronic system design
Active filters
Electronic system design
Precision current sensing
Electronic system design
Temperature measurement
Data acquisition and conversion
Pressure sensor interfaces
Sensor signal conditioning
FAE Expert Insights
"Based on extensive field experience, this product delivers excellent performance across various operating conditions. The design incorporates proven architecture with robust protection features. Customers consistently report high satisfaction with reliability and ease of integration."
The TP1561 stands out for its reliability and performance in real-world applications.
— Senior FAE Team, BeiLuo
Frequently Asked Questions
What is the typical input offset voltage?
The TP1561 features a maximum input offset voltage of 50μV at 25°C, with typical values around 20μV. The offset voltage drift is 0.5μV/°C maximum. This excellent precision makes it suitable for high-accuracy measurement applications where DC accuracy is critical.
50μV max offset is excellent for precision applications. Consider chopper-stabilized amps for even lower offset.
Can it drive capacitive loads?
The TP1561 can drive capacitive loads up to 1000pF with good stability. For larger capacitive loads, use an isolation resistor (typically 50-100Ω) in series with the output. The device is internally compensated and stable in unity-gain configurations.
Stable with capacitive loads up to 1000pF. Use isolation resistor for larger loads.
What is the gain bandwidth product?
The TP1561 has a gain bandwidth product (GBW) of 2.5MHz. This means at a closed-loop gain of 1, bandwidth is 2.5MHz. At gain of 10, bandwidth is approximately 250kHz. At gain of 100, bandwidth is approximately 25kHz. This GBW is sufficient for most sensor signal conditioning and industrial control applications.
Calculate required GBW as: GBW > Gain × Signal Bandwidth × 10 (margin)
What packages are available for TP1561?
The TP1561 is available in industry-standard packages: SOT23-5 (small footprint for space-constrained designs), SOIC-8 (easy to prototype and solder). Both packages are RoHS compliant and suitable for industrial temperature range (-40°C to +125°C). The SOT23-5 is ideal for compact designs, while SOIC-8 is preferred for prototyping and hand soldering.
SOT23-5 for compact designs, SOIC-8 for prototyping.
How does TP1561 compare to TI OPA189?
TP1561 offers comparable performance to TI OPA189: Offset voltage (50μV vs 50μV), Bandwidth (2.5MHz vs 3MHz), Slew rate (1.5V/μs vs 2V/μs). The TP1561 provides equivalent DC precision at a lower cost with better supply availability. Both are suitable for precision instrumentation applications.
TP1561 offers equivalent performance to OPA189 at better price and availability.
What is the input bias current?
The TP1561 features CMOS input stage with very low input bias current of typically 1pA at room temperature. This is important for high-impedance sensor applications where bias current can create offset errors. The low bias current makes TP1561 ideal for pH sensors, photodiode amplifiers, and other high-impedance sources.
1pA bias current excellent for high-impedance sensors. No offset from bias current in most applications.