INA117BM - Precision Difference Amplifier | Texas Instruments
MPN： INA117BM ✓ 啟用中INA117BM 概覽
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.
直接替換替代品，適用於 INA117BM — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： INA117BM （相同外形與佔位） — 差異在於 Bandwidth, Gain, Mounting Type, Operating Temperature Range, Package.
INA117AM
✅ 直接替換聯絡詢價
查看資料表 →INA117BM-BI
✅ 直接替換📋 參考替代品（不在目錄中）
INA117P-BI
✅ 直接替換📋 參考替代品（不在目錄中）
INA117BM 最大額定值與電氣特性
| 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% |
| 工作溫度範圍 | -40°C to 85°C |
| 封裝 | 8-pin TO-99-8 metal package |
| 安裝類型 | Through-hole |
| Die Manufacturing Process | CSO: SHE |
INA117BM 8-pin to-99-8 metal package 腳位配置指南
INA117BM（8-pin to-99-8 metal package 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： INA117BM.
請參閱 資料表 以查看完整腳位配置。
典型應用
INA117BM 適用於 6 應用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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 INA117BM — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Unity-gain precision difference-amplifier architecture (對比INA117AM)
- High common-mode input voltage capability (對比INA117P-BI)
- 200 kHz CSO: SHE bandwidth (對比INA117BM-BI)
設計說明
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.
合規資訊
The INA117 product information confirms the package and operating temperature range but does not provide the extracted compliance classifications.
