INA117AM - ±200V Difference Amplifier | Texas Instruments
料号： INA117AM ✓ 量产中INA117AM 概述
A difference amplifier is a specialized amplifier topology that amplifies the voltage between two inputs while rejecting a voltage common to both inputs. The INA117 belongs to the broader hierarchy of differential amplifiers, instrumentation signal conditioners, amplifier ICs, and analog semiconductor devices. Its integrated thin-film resistor network provides matched ratios, allowing accurate differential measurement when its common-mode and output operating limits are respected.
The monolithic INA117 combines a precision operational amplifier with an integrated resistor network. Its unity-gain architecture makes it suitable for direct differential sensing, while the ±200 V common-mode capability separates the usable input signal from the potentially much larger voltage appearing at both inputs. The 200 kHz bandwidth supports measurements beyond static DC conditions but remains focused on precision signal extraction rather than high-speed data conversion. The INA117 family is also specified for operation from -40°C to 85°C.
Two package options are available for the INA117 family: an 8-pin plastic mini-DIP and an 8-pin SO-8 surface-mount package. The INA117AM is the TO-99-8 metal-can ordering option shown by the manufacturer and distributor listings. The metal-can format supports compact through-hole insertion and is useful where a robust, shielded package is preferred over a surface-mount carrier. Its 8-pin configuration also means the differential amplifier requires careful signal routing and grounding around the circular package.
Typical applications include high-voltage current sensing, power-converter feedback monitoring, battery-system measurement, industrial transducer interfaces, and instrumentation where a small differential signal is superimposed on a large common-mode voltage. In these systems, the INA117 can reject the common signal and present a scaled differential result to an ADC, comparator, control loop, or measurement instrument. Input protection, common-mode transient limits, output saturation, and thermal behavior must be evaluated together.
When implementing this device, verify that neither input exceeds the specified common-mode range under every operating condition. Keep sensitive input and reference connections short, use a stable low-noise supply, and provide adequate return paths for high-impedance sources. Account for output settling and bandwidth when filtering small signals from fast common-mode transients, since common-mode rejection and transient performance are distinct design considerations.
This product page combines the manufacturer’s device description, package information, operating-temperature range, exact ordering identifier, source documents, application guidance, and qualified replacement analysis. It also distinguishes genuine pin-compatible alternatives from devices that share only the broad function of high-voltage difference amplification, helping engineers make a PCB-level replacement decision rather than a feature-level comparison.
直接替换替代料： INA117AM ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： INA117AM （相同外形与封装尺寸） ——差异在于 Bandwidth, Gain, Mounting Type, Operating Temperature Range, Package.
INA117AM 最大额定值与电气特性
| Amplifier Type | Precision unity-gain difference amplifier |
| Number of Circuits | 1 circuit |
| Common-Mode Input Voltage Range | ±200 V |
| Gain | 1 (unity gain) |
| Bandwidth | 200 kHz |
| Architecture | Monolithic precision operational amplifier with integrated thin-film resistor network |
| 封装 | TO-99-8 metal can |
| 引脚数量 | 8 pins |
| 安装类型 | Through-hole insertion |
| 工作温度范围 | -40°C to +85°C |
| Family Package Options | 8-pin plastic mini-DIP and 8-pin SO-8 surface mount |
INA117AM 8-pin plastic mini-dip and 8-pin so-8 surface mount 引脚配置指南
INA117AM（8-pin plastic mini-dip and 8-pin so-8 surface mount 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： INA117AM.
请参阅 数据手册 以查看完整引脚配置。
典型应用
INA117AM 适用于 6 应用s: High-Voltage Current Sensing, Power-Converter Feedback Monitoring, Battery-System Measurement, Industrial Transducer Interfaces, Precision Signal Isolation Across High Side, Laboratory and Instrumentation Front Ends.
High-Voltage Current Sensing
The INA117AM fits high-voltage current sensing when a small shunt voltage appears across a resistive sense element while both measurement inputs share a large common-mode voltage. Its ±200 V common-mode range provides substantial headroom in motor, power-converter, and industrial drive systems, while unity gain preserves the measured differential signal for an ADC or controller. Place the amplifier across the shunt and provide a low-impedance reference return. Verify differential input limits, output swing, supply compatibility, and the effects of shunt impedance and bandwidth before production use.
推荐
Power-Converter Feedback Monitoring
INA117AM can monitor small feedback or error voltages in power-converter systems where switching-node or bus voltage appears at both inputs. The ±200 V common-mode range allows the difference amplifier to operate close to elevated power rails without an external high-voltage divider. Use it near the controller feedback network to improve local signal integrity and reduce contamination from the switching node. The 200 kHz bandwidth should be checked against ripple and transient requirements, and the output must remain within the amplifier’s linear output range.
推荐
Battery-System Measurement
The INA117AM is appropriate for battery-management systems that must measure a small differential cell or balancing signal while the input pair sits at a substantial common-mode voltage. The integrated thin-film network supports accurate difference amplification without a discrete resistor divider, and the ±200 V common-mode capability covers many traction, stationary, and industrial battery buses. The designer must still confirm polarity, input protection, supply availability, output headroom, and operating temperature. Protection components should handle fault energy without distorting the measurement bandwidth.
推荐
Industrial Transducer Interfaces
INA117AM can serve as the front end for industrial transducers that produce a small differential output while sharing a high common-mode voltage. Its precision unity-gain architecture helps preserve transducer signals without requiring an external matched divider, and the metal-can TO-99-8 package provides a compact through-hole implementation. Connect the output to an ADC or instrumentation stage with adequate grounding and isolation. Check input bias current, source impedance, output swing, supply range, and common-mode transient behavior because a high input voltage does not replace application-specific protection.
推荐
Precision Signal Isolation Across High Side
INA117AM can amplify a low-level differential signal referenced to a high-side or floating potential, making it useful when the measured quantity is small but its common-mode voltage is large. The integrated precision resistor network simplifies matching compared with a discrete difference stage. For a working design, establish a suitable local supply and reference, keep the input loop compact, and verify that both inputs remain within the ±200 V common-mode region even during switching events. The 200 kHz bandwidth is appropriate for many measurement-band signals but not arbitrary high-frequency transients.
推荐
Laboratory and Instrumentation Front Ends
INA117AM is useful in laboratory instrumentation that must measure small differential signals riding on large common-mode voltages. The unity-gain topology gives engineers a defined gain of 1, while the 200 kHz bandwidth supports audio-band and general-purpose measurement work. Use a low-noise local supply and a clean reference return, and evaluate output offset, settling, and common-mode rejection at the actual signal frequency. Because the TO-99-8 package uses a circular through-hole lead arrangement, follow the package drawing exactly when creating the footprint.
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推荐产品汇总
工程参考数据： INA117AM ——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 | INA117BM |
|---|---|---|
| Package | TO-99-8 metal can | TO-99-8 metal can |
| Brand | Texas Instruments | Texas Instruments |
| Amplifier Type | Precision unity-gain difference amplifier | Precision unity-gain difference amplifier |
| Gain | 1 (unity gain) | 1 (unity gain) |
| Bandwidth | 200 kHz | 200 kHz |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C |
| Circuit Count | 1 circuit | 1 circuit |
| Internal Resistor Network | Integrated thin-film resistor network | Integrated thin-film resistor network |
关键差异点
- High common-mode measurement capability （对比 INA149)
- Integrated precision resistor network （对比 INA117BM)
- Defined unity-gain measurement behavior （对比 INA828)
设计说明
Do not treat the ±200 V common-mode capability as permission to apply arbitrary voltages to either input. Check the differential input rating, absolute maximum ratings, input current behavior, and output swing in the Texas Instruments manufacturer datasheet. Add protection that limits fault energy without introducing excessive leakage or capacitance, and verify that startup, shutdown, and fault conditions cannot move either input outside its safe operating region.
Route the two sense inputs as a tightly coupled pair and provide a low-impedance return close to the source. The TO-99-8 package has a circular lead arrangement, so create the footprint from the package drawing rather than adapting an SO-8 land pattern. Keep high-current switching paths and protection devices away from the input pins. A solid ground plane, short output route, and local supply bypassing help preserve signal integrity around the monolithic amplifier and integrated resistor network.
Evaluate the complete signal path against the 200 kHz bandwidth rather than checking only DC accuracy. Source impedance, input capacitance, protection leakage, output loading, and post-amplifier filtering can each affect settling and differential-to-common-mode conversion. Measure common-mode rejection at the frequencies present in the design and include startup or protection-related transients in system validation. The manufacturer datasheet remains the controlling reference for recommended operating conditions.
Design the local supply for the amplifier’s exact voltage and current requirements, including startup behavior at the highest expected input common-mode voltage. Confirm that the output can remain linear at the intended signal level and load. Because the TO-99-8 package must dissipate internally, calculate worst-case internal power from the actual supply, output voltage, and load. Use the manufacturer thermal information and maintain the package’s specified environmental and copper conditions.
合规信息
The INA117AM is a precision analog amplifier in a TO-99-8 package. Specific RoHS, REACH, lead-free, halogen-free, and conflict-minerals statements require confirmation from the manufacturer’s current product documentation.
