INA117BM - Precision Difference Amplifier | Texas Instruments
料号： INA117BM ✓ 量产中INA117BM 概述
A difference amplifier is an analog signal-conditioning component that subtracts one input voltage from another and amplifies the resulting difference. The INA117 belongs to the instrumentation amplifier and differential amplifier family, where precision resistor matching helps maintain accurate gain and common-mode rejection. Its monolithic construction combines a precision operational amplifier with an integrated thin-film resistor network, simplifying circuit design compared with a discrete resistor network and separate op amp. The result is a fixed unity-gain device intended for applications requiring accurate differential measurement rather than adjustable gain.
Key characteristics of the INA117BM include low nonlinearity of 0.001% and a 200 kHz bandwidth for the specified CSO: SHE die. The wide common-mode input range allows the input terminals to operate near the supply-voltage envelope, which is useful when measuring small differential signals riding on a larger voltage. The device is offered in an 8-pin plastic mini-DIP and an 8-pin SO-8 surface-mount package in the INA117 family; INA117BM specifically uses the TO-99-8 package. The specified operating temperature range for the family is -40°C to 85°C.
Typical uses include high-side current sensing in motor-control and power-conversion systems, battery monitoring, precision bridge amplifiers, and industrial measurement front ends. The unity-gain architecture makes the part appropriate when the system requires a fixed differential gain of one and very high common-mode rejection. Applications should still verify the exact supply, common-mode, output-swing, and stability limits for the selected package and operating conditions before production release.
For PCB implementation in a through-hole TO-99-8 design, preserve adequate clearance around the metal package, route sensitive input traces away from switching nodes, and use a stable reference or low-impedance return for the signal source. Because the internal gain network is precision matched, careful grounding and connector placement are important for preserving the benefit of the common-mode rejection. This page provides technical guidance, application fit, and pin-compatible replacement information for engineers evaluating the INA117BM.
直接替换替代料： INA117BM ——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： INA117BM （相同外形与封装尺寸） ——差异在于 Bandwidth, Gain, Mounting Type, Operating Temperature Range, Package.
INA117AM
✅ 直接替换联系询价
查看数据手册 →INA117BM-BI
✅ 直接替换📋 参考替代料（不在目录中）
INA117P-BI
✅ 直接替换📋 参考替代料（不在目录中）
INA117BM 最大额定值与电气特性
| Product Type | Precision unity-gain difference amplifier |
| Number of Circuits | 1 circuit |
| Gain | 1 unity gain |
| Bandwidth | 200 kHz for CSO: SHE |
| Maximum Bandwidth | 500 kHz for CSO: TID |
| Nonlinearity | 0.001% |
| 工作温度范围 | -40°C to 85°C |
| 封装 | 8-pin TO-99-8 metal package |
| 安装类型 | Through-hole |
| Die Manufacturing Process | CSO: SHE |
INA117BM 8-pin to-99-8 metal package 引脚配置指南
INA117BM（8-pin to-99-8 metal package 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： INA117BM.
请参阅 数据手册 以查看完整引脚配置。
典型应用
INA117BM 适用于 6 应用s: High-Side Current Sensing, Battery Monitoring, Industrial Bridge Measurement, Precision Buffering, Motor Control Feedback, Test and Measurement Front Ends.
High-Side Current Sensing
The INA117BM suits high-side current sensing when a small shunt voltage must be measured while the common-mode voltage is substantially higher than the signal. Its unity-gain difference-amplifier architecture is useful for preserving a 1:1 differential relationship, while the very high common-mode input range helps the amplifier operate near the supply envelope. Place the shunt inputs on short, symmetric traces and keep switching-node copper away from the input pair. Confirm the actual common-mode limits, output swing, and transient response against the Texas Instruments datasheet before using it in a motor or power-converter leg.
推荐
Battery Monitoring
The INA117BM can monitor differential voltage across a battery sense resistor or divider when the common-mode voltage varies over a broad range. Its fixed unity gain makes it appropriate for measurements where the circuit later performs scaling and filtering. The integrated precision resistor network simplifies the differential front end and reduces dependence on external resistor matching. In a battery-management design, verify the maximum common-mode voltage, supply range, input polarity, and output headroom. Use Kelvin routing where practical to reduce voltage drops in the sense connections.
推荐
Industrial Bridge Measurement
The INA117BM is appropriate for differential bridge outputs where the desired signal is small relative to a substantial common-mode voltage. Its 200 kHz bandwidth for the CSO: SHE implementation provides useful bandwidth for many slow-to-moderate industrial measurement paths, while 0.001% nonlinearity supports accurate signal reproduction. The device provides unity gain, so downstream circuitry must perform any required additional scaling. Ensure excitation and input common-mode voltages remain within the datasheet limits, and provide filtering appropriate for the sensor bandwidth rather than unnecessarily reducing the usable signal rate.
推荐
Precision Buffering
The INA117BM can serve as a differential buffer in measurement systems that need to reject common-mode noise before a converter or control circuit. Its monolithic construction combines a precision op amp with an integrated thin-film resistor network, simplifying implementation compared with discrete matched resistors. The high common-mode capability makes it useful when the buffer input is not referenced to ground. Confirm the required output swing and drive capability at the selected supply voltage, and avoid excessive capacitive loading that could affect stability.
推荐
Motor Control Feedback
The INA117BM can monitor motor-drive feedback or shunt current in systems where the sensed common-mode voltage rises and falls rapidly. Its high common-mode input range and differential rejection are useful for separating a small measurement signal from the motor-switching environment. Layout quality remains essential: use short differential traces, a solid ground reference, and isolation from gate-drive and power-switching copper. Validate bandwidth and recovery behavior against the fastest switching transient, and confirm that the output remains within the linear range at maximum motor current.
推荐
Test and Measurement Front Ends
The INA117BM is useful in laboratory and industrial test front ends where a small differential input must be isolated from a larger common-mode voltage. The fixed unity gain provides a predictable signal path, while the 200 kHz CSO: SHE bandwidth accommodates many general-purpose measurement tasks. For instrument-grade accuracy, include offset, bias-current, and CMRR terms in the uncertainty budget. Use shielded input routing and controlled grounding to prevent leakage and connector noise from dominating the measurement, especially at long input-cable lengths.
推荐
推荐产品汇总
工程参考数据： INA117BM ——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 | INA117AM | INA117BM-BI | INA117P-BI |
|---|---|---|---|---|
| Product Type | Precision unity-gain difference amplifier | Precision unity-gain difference amplifier | Precision unity-gain difference amplifier | Precision unity-gain 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 |
| Number of Circuits | 1 circuit | 1 circuit | 1 circuit | 1 circuit |
| Gain | 1 unity gain | 1 unity gain | 1 unity gain | 1 unity gain |
| Mounting Type | Through-hole | Through-hole | Through-hole | Through-hole |
关键差异点
- Unity-gain precision difference-amplifier architecture （对比 INA117AM)
- High common-mode input voltage capability （对比 INA117P-BI)
- 200 kHz CSO: SHE bandwidth （对比 INA117BM-BI)
设计说明
Route the two INA117BM input connections as a tight differential pair from the source to the device. Keep the pair away from switching nodes, relay contacts, and high-current return paths. A common return conductor can help reject the unwanted voltage shared by both inputs; do not create a large copper loop between the input source and the amplifier ground.
Check the common-mode voltage at the pins, not only the differential voltage across them. The INA117BM can accept a very high common-mode input range, but the supply voltage, output swing, input polarity, and maximum input differential voltage still limit the operating region. Use the manufacturer ordering information to confirm the exact INA117BM suffix and its electrical limits before production.
For high-side sensing, connect the shunt and amplifier inputs with Kelvin routing so copper resistance does not add to the measured voltage. Keep the sense loop small and place any input protection close to the source. If the input cable is long, add protection and filtering that are stable with the INA117 frequency response rather than relying on excessive capacitance at the input.
Decouple the supply pins with local ceramic capacitance and provide a low-impedance return to the device. If the common-mode signal is referenced to a high-voltage rail, use the amplifier's supply arrangement and pin assignments exactly as shown in the manufacturer application guidance. Verify output headroom at the worst-case differential input because unity gain does not eliminate the normal output-swing limitation.
合规信息
The INA117 product information confirms the package and operating temperature range but does not provide the extracted compliance classifications.
