INA117SM - High Common-Mode Difference Amplifier | TI
料号： INA117SM ✓ 量产中INA117SM 概述
A difference amplifier is a specialized amplifier configuration that rejects voltage common to both inputs and amplifies the voltage difference between them. The INA117 belongs to the high-common-mode difference-amplifier category, where its common-mode rejection capability is more important than its ability to operate only within a conventional low-voltage signal range. It is used as a signal-conditioning stage between high-voltage sensing nodes and downstream measurement or control circuitry.
The principal benefits of the INA117SM are its very high common-mode input range, low nonlinearity of 0.001%, and 200 kHz bandwidth in the CSO: SHE version. Its unity-gain architecture simplifies closed-loop implementation while the integrated resistor network reduces external component count. The TO-99-8 package also provides a traditional through-hole format for instrumentation and industrial equipment where long-term availability and straightforward assembly are important.
Internally, the INA117SM consists of a monolithic precision amplifier and thin-film resistor network. The difference-amplifier topology subtracts the two input voltages and multiplies the resulting differential signal by the closed-loop gain. At unity gain, the input pair is configured so that common-mode voltage is rejected while the desired sensor differential is amplified. Its specified bandwidth supports measurement systems that need more signal bandwidth than a slow precision-only amplifier, although filtering may still be required for high-noise environments.
Typical applications include high-voltage current sensing, bridge-sensor signal conditioning, battery and power-system monitoring, industrial process measurement, and laboratory instrumentation. The device is particularly useful when a low-level differential signal is superimposed on a much larger common-mode voltage. System designers should also consider input protection, supply requirements, resistor tolerance, and the bandwidth required for the sensed waveform when assigning the amplifier.
The main design consideration is that the INA117SM does not eliminate the need for careful analog layout. Keep input and feedback traces short, place compensation or filtering components close to the device, and avoid routing high-current paths near the sensitive input nodes. Confirm the common-mode and supply limits against the exact datasheet ordering information before applying the part where the input voltage can approach a system rail.
This page consolidates the verified INA117SM product information, source links, technical distinctions, and selection guidance into one engineering reference. It also identifies same-package family options and explains where application-specific verification remains necessary, helping designers choose a replacement without assuming that different INA117 order codes are automatically interchangeable.
直接替换替代料： INA117SM ——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： INA117SM （相同外形与封装尺寸） ——差异在于 Mounting Type, Package.
INA117BM
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →INA117SMQ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
INA117SM 最大额定值与电气特性
| Product Type | High common-mode voltage difference amplifier |
| Amplifier Count | 1 circuit |
| Gain Configuration | Unity gain |
| Maximum Nonlinearity | 0.001% |
| Bandwidth at CSO: SHE | 200 kHz |
| Bandwidth at CSO: TID | 500 kHz |
| Operating Temperature Range for Plastic Packages | -40°C to 85°C |
| Operating Temperature Range for INA117SM | -55°C to 125°C |
| 封装 | TO-99-8 |
| 引脚数量 | 8 pins |
| 安装类型 | Through-hole |
| Integrated Resistor Network | Thin-film resistor network |
| Signal Input | Differential input |
INA117SM to-99-8 引脚配置指南
INA117SM（to-99-8 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： INA117SM.
请参阅 数据手册 以查看完整引脚配置。
典型应用
INA117SM 适用于 6 应用s: High-Voltage Current Sensing, Bridge-Sensor Signal Conditioning, Battery and Power-System Monitoring, Industrial Process Measurement, Laboratory Instrumentation, Instrumentation and Test Equipment.
High-Voltage Current Sensing
The INA117SM fits current-sense circuits where a small differential voltage appears across a shunt while the shunt common-mode voltage is much higher. Its 0.001% maximum nonlinearity supports accurate conversion of the sensed voltage into an output proportional to the shunt differential. The 200 kHz bandwidth for the CSO: SHE version also permits measurement of current transients beyond very slow DC. Place the amplifier across the shunt, keep the input loop compact, and provide suitable input protection when the common-mode voltage can approach a rail.
推荐
Bridge-Sensor Signal Conditioning
The INA117SM is suitable for bridge or other differential sensors whose output includes a substantial common-mode component. Its unity-gain difference-amplifier architecture rejects the common signal and presents a conditioned differential output to a controller or converter. The specified nonlinearity of 0.001% is valuable when preserving sensor scale accuracy, while the 200 kHz CSO: SHE bandwidth supports moderately fast measurement loops. Input filtering and sensor-specific excitation settling should be evaluated so that bandwidth and noise do not compromise the bridge output.
推荐
Battery and Power-System Monitoring
INA117SM can amplify a small voltage-difference measurement taken across a battery, power bus, or protection element while rejecting a high common-mode voltage. Its 0.001% maximum nonlinearity supports accurate supervisory and energy-management measurements, and the extended -55°C to 125°C range suits demanding industrial environments. The circuit must remain within the device's specified input and supply limits, and the input network should include protection appropriate for the bus voltage and fault conditions.
推荐
Industrial Process Measurement
The INA117SM is appropriate for process-control front ends that measure small differential sensor signals riding on larger industrial common-mode voltages. Its integrated precision amplifier and thin-film resistor network reduce the number of external precision components, while unity gain simplifies amplifier configuration. The 200 kHz bandwidth for the CSO: SHE version is useful for process loops that require reasonable dynamic response. Use short, shielded signal routing, verify the exact common-mode limits, and consider input filtering to reject high-frequency interference.
推荐
Laboratory Instrumentation
The INA117SM can serve as the input stage of laboratory instruments that measure weak differential voltages with substantial common-mode content. Its low 0.001% nonlinearity helps preserve measurement accuracy, and its 200 kHz CSO: SHE bandwidth is adequate for many general-purpose signal sources and measurement chains. The TO-99-8 through-hole package supports traditional instrument construction and repair practices. For precision bench equipment, check noise, offset, drift, supply requirements, and grounding before finalizing the signal path.
推荐
Instrumentation and Test Equipment
The INA117SM supports instrumentation amplifier front ends that must recover a low-level differential input from a high-voltage common-mode environment. Its thin-film resistor network and precision op-amp architecture provide integrated differential sensing, while the 200 kHz bandwidth accommodates many general-purpose test signals. The same-package INA117 order codes provide potential upgrade paths when grade or qualification requirements differ. Board-level design should include a low-noise supply, grounding that avoids shunt currents, and protection against accidental overvoltage.
推荐
推荐产品汇总
工程参考数据： INA117SM ——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 | INA117SMQ | INA117P |
|---|---|---|---|---|
| Product Type | High common-mode voltage difference amplifier | High common-mode voltage difference amplifier | Qualified high common-mode voltage difference amplifier | High common-mode voltage difference amplifier |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | TO-99-8 | TO-99-8 - same | TO-99-8 - same | TO-99-8 - same |
| Pin Count | 8 pins | 8 pins | 8 pins | 8 pins |
| Gain Configuration | Unity gain | Unity gain | Unity gain | Unity gain |
关键差异点
- Extended-temperature TO-99-8 option （对比 INA117AM)
- Low signal-chain nonlinearity （对比 INA117BM)
- Qualified same-package family option （对比 INA117SMQ)
设计说明
Route the two INA117SM inputs as a closely matched, short pair from the sensing source, with continuous grounding under the differential path. Keep the input loop small and avoid switching-power nodes, high-current returns, and isolation boundaries. Because the device measures a small difference between two potentially large voltages, even a few millivolts of parasitic conversion in the input network can become a meaningful measurement error.
Do not assume that the family-level bandwidth applies to every die process. The manufacturer lists 200 kHz for the CSO: SHE version and 500 kHz for the CSO: TID version. Confirm the process marking and ordering information for the INA117SM before sizing filters or interpreting dynamic response. Likewise, verify the exact common-mode, supply, input-current, and temperature limits from the manufacturer datasheet.
Keep feedback and gain-setting components close to the device and use a stable, low-impedance reference for the noninverting input. Treat the common-mode input network as a precision resistor network: resistor drift, mismatch, and leakage directly affect differential accuracy. If additional input filtering is required, account for the resulting differential phase shift and verify that it does not impair the intended measurement bandwidth.
Decouple the supply pins close to the device and provide a return path that does not share current with sensitive input measurement nodes. Before energizing a high-voltage circuit, confirm the absolute maximum input and supply ratings, including transients. Add clamp or series impedance where necessary so that a fault cannot exceed the limits specified for the exact order code.
合规信息
Compliance information was not stated for the INA117SM on the referenced product page and search result. Use the manufacturer product page, current material-declaration records, or a project-specific quality assessment for confirmation.
