INA2143U - 5-V/µs Dual Precision Difference Amplifier | TI
料号： INA2143U ✓ 量产中INA2143U 概述
A difference amplifier is a specialized operational-amplifier circuit that compares voltages applied to its inverting and non-inverting inputs and amplifies the voltage between them. This method helps reject signals that appear equally on both inputs, making difference amplifiers useful within measurement, instrumentation, analog-control, and signal-conditioning systems. The INA2143U belongs to the amplifier IC category and combines two precision difference amplifiers in one package.
Key features include a 5 V/µs slew rate, 250 µV offset, gain options of 10 and 0.1, dual-channel operation, and an operating temperature range of -55°C to 125°C. The 5 V/µs slew rate allows the output to respond quickly to input-voltage changes, while the selectable gain provides flexibility for different differential-signal levels. Each channel can support the two stated gain configurations.
The INA2143U combines two difference amplifiers in a single 14-pin SOIC (D) package, reducing board area when two differential channels are required. Its high-speed and precision positioning makes it applicable to fast analog signal conditioning, where the main design objective is to preserve the relationship between two input voltages while converting the differential signal into a single-ended output.
Typical applications include current-sense amplifier front ends, differential sensor interfaces, bridge-based measurement circuits, industrial instrumentation, and analog control systems. In a current-sense design, the amplifier processes the voltage generated across a sense resistor rather than the full supply voltage. In a bridge or differential sensor interface, it rejects common-mode voltage and preserves the smaller differential component being measured.
Designers should use the manufacturer pin-description table when assigning traces and power connections, and they should verify signal amplitudes against the selected gain of 10 or 0.1. PCB placement should minimize resistive and capacitive pickup around the differential inputs, while supply bypassing should follow the connection and capacitor recommendations in the manufacturer datasheet.
This page combines the confirmed INA2143U operating characteristics with practical selection guidance, application context, package information, and drop-in replacement validation. It distinguishes confirmed device attributes from parameters that require confirmation from the complete manufacturer datasheet, helping engineers plan sourcing and circuit design with fewer assumption-driven steps.
直接替换替代料： INA2143U ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料INA2143U 最大额定值与电气特性
| Amplifier Type | Dual precision difference amplifier |
| Number of Amplifier Channels | 2 channels |
| Slew Rate | 5 V/µs |
| Input Offset Voltage | 250 µV |
| Gain Option 1 | 10 |
| Gain Option 2 | 0.1 |
| Minimum Operating Temperature | -55°C |
| Maximum Operating Temperature | 125°C |
| Package Type | SOIC (D) |
| 引脚数 | 14 pins |
| 安装类型 | Surface mount |
INA2143U soic (d) 引脚配置指南
INA2143U（soic (d) 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： INA2143U.
请参阅 数据手册 以查看完整引脚配置。
典型应用
INA2143U 适用于 6 应用s: High-Side Current Sensing, Bridge Sensor Signal Conditioning, Industrial Differential Instrumentation, Analog Control Feedback, Differential Voltage Monitoring, Test and Measurement Front Ends.
High-Side Current Sensing
The INA2143U is suitable for high-side current-sense amplifier circuits in which a small differential voltage across a sense resistor must be amplified. Its 5 V/µs slew rate supports measurement of changing load current, while the selectable gains of 10 and 0.1 provide options for different sense-resistor values. The 250 µV offset is an important consideration when the expected differential voltage is close to the measurement floor. Each of the two amplifier channels can monitor a different current path, including separate supply branches or a three-phase system. Confirm the input common-mode range, output swing, and gain-error limits in the manufacturer datasheet before finalizing the resistor and trace layout.
Bridge Sensor Signal Conditioning
The INA2143U can condition differential outputs from resistive bridge sensors such as strain, pressure, and temperature bridges. The 250 µV offset supports precision-oriented measurements, while gain settings of 10 and 0.1 allow the front end to match different bridge excitation levels and sensitivities. Its two channels can process complementary bridge signals or two independent sensors with consistent conditioning requirements. The 5 V/µs slew rate is valuable when the sensor waveform changes rapidly or when the amplifier follows a dynamic mechanical or thermal event. Use matched routing for the differential inputs and verify supply voltage, common-mode range, and output-voltage limits against the manufacturer datasheet.
Industrial Differential Instrumentation
The INA2143U fits industrial measurement systems that must recover a small differential signal from a larger common-mode voltage. Its -55°C to 125°C operating-temperature range supports equipment designed for extended thermal environments, and the dual architecture reduces the amplifier count when two measurement channels are needed. Gains of 10 and 0.1 provide flexibility for both low-level sensor outputs and larger differential inputs. The 5 V/µs slew rate allows accurate tracking of faster instrumentation waveforms, while the 250 µV offset is a key parameter for low-level accuracy calculations. Confirm the power rails, common-mode limits, electrical noise, and calibration requirements before integrating it into measurement equipment.
Analog Control Feedback
The INA2143U can amplify the error voltage in an analog feedback loop where two nodes must be compared directly. The gain of 10 increases small differences for corrective action, while the gain of 0.1 attenuates larger differential errors. Its 5 V/µs slew rate supports feedback systems that require a rapid response to control-loop corrections. The two channels allow one amplifier to compare inputs while the other handles a complementary monitoring or feedback function. Because the package is a 14-pin SOIC (D), the device can be placed near the measured nodes to reduce signal pickup. Validate loop stability, output swing, noise behavior, and saturation recovery using the manufacturer datasheet and application guidance.
Differential Voltage Monitoring
The INA2143U is appropriate for continuous differential-voltage monitoring where the quantity of interest is the difference between two input nodes rather than either voltage referenced to ground. The 250 µV offset defines the nominal input imbalance associated with the amplifier, and the available gains of 10 and 0.1 accommodate two signal ranges. Two channels permit simultaneous monitoring of supply differences, battery imbalance, or paired sensor outputs. The 5 V/µs slew rate provides useful response margin for rapidly changing monitored quantities. Keep input traces short and symmetric, avoid routing beside noisy switching paths, and confirm that both input and output operating points remain inside the electrical limits in the manufacturer datasheet.
Test and Measurement Front Ends
The INA2143U can serve as the analog front end of test and measurement equipment requiring differential input conditioning with two available gain settings. Gain of 10 is useful for expanding small errors, while gain of 0.1 provides attenuation for larger differential signals. The 250 µV offset should be included in the total measurement-error budget, and the 5 V/µs slew rate should be checked against the fastest waveform expected by the test system. The dual configuration allows two channels to share consistent conditioning characteristics. For instrumentation-grade results, evaluate input bias current, noise, common-mode rejection, gain error, and output behavior under the intended bandwidth using the manufacturer datasheet.
工程参考数据： INA2143U ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 |
|---|---|
| Brand | Texas Instruments |
| Package | 14-pin SOIC (D) |
| Amplifier Channels | 2 channels |
| Slew Rate | 5 V/µs |
| Input Offset Voltage | 250 µV |
| Gain Setting 1 | 10 |
| Gain Setting 2 | 0.1 |
| Operating Temperature Range | -55°C to 125°C |
设计说明
Route the two inputs belonging to each differential channel as a closely matched pair and keep them away from switching nodes and high-current return paths. A difference amplifier rejects common-mode voltage only when both input nodes experience the same disturbance. Place the device close to the source of the differential signal when the application is sensitive to induced noise, and use a continuous ground reference beneath the relevant signal path.
Select the gain of 10 or 0.1 according to the differential-input range and required output range rather than using gain as the only protection against overdrive. Confirm the output-voltage limits, input common-mode range, and saturation-recovery behavior in the manufacturer datasheet. Place the bypass capacitor directly across the appropriate supply and ground pins using the shortest possible connection to minimize supply impedance and switching noise.
Do not assume that the 250 µV offset specification covers every error source. Include gain error, input bias current, noise, and common-mode effects in the complete error budget. Also verify that both amplifier channels are connected according to the pin-description table; the 14-pin SOIC package contains signals for two channels, and swapping input or feedback assignments can introduce positive feedback or incorrect gain.
合规信息
The available manufacturer product information does not explicitly state the requested compliance classifications.
