INA155U - 5.5V 550kHz CMOS INA | Texas Instruments
料号： INA155U ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
INA155U 概述
An instrumentation amplifier is a specialized analog IC that amplifies the difference between two input signals while rejecting common-mode noise. INA155U belongs to the broader hierarchy of analog signal-conditioning devices: instrumentation amplifier, differential amplifier, analog amplifier, and semiconductor. This device is particularly useful when a sensor output is small, noisy, or referenced to a changing common-mode voltage and the next stage requires a larger single-ended signal.
The manufacturer identifies the INA155 family as a 5.5 V single-supply, 550 kHz, rail-to-rail-output CMOS instrumentation amplifier. The verified distributor data identifies INA155U as a one-circuit, rail-to-rail-output device in an 8-pin SOIC package. The 550 kHz bandwidth makes it appropriate for signal paths that require response beyond static precision measurements, provided the application does not require high-frequency instrumentation-amplifier performance.
The INA155U is intended for low-voltage sensor interfaces, portable measurement systems, industrial signal conditioning, and analog-to-digital converter front ends. Its rail-to-rail output can simplify designs using a 3.3 V or 5 V supply because the output can swing close to the upper rail under suitable load conditions. The exact input common-mode range, gain settings, output swing, noise, and current specifications were not included in the verified data and must be checked in the manufacturer datasheet before final design release.
For PCB implementation, use a low-noise ground reference, place input and feedback components close to the device, and keep sensitive differential traces short and symmetric. Decoupling capacitors should be placed at the supply pins according to the manufacturer recommendations. Verify the complete signal chain against the datasheet limits, especially when the source impedance, gain, output load, supply voltage, or common-mode input level differs from the nominal application conditions.
This page combines the verified INA155U product identity and distributor links with structured application, comparison, and design guidance. It does not infer electrical values that were not explicitly supplied in the retrieved data, and it identifies missing parameters for engineering confirmation.
直接替换替代料： INA155U ——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： INA155U （相同外形与封装尺寸） ——差异在于 Bandwidth, Product Type.
快速对比工具——选择替代料号进行并排对比：
INA155UA
✅ 直接替换📋 参考替代料（不在目录中）
INA155UG4
✅ 直接替换📋 参考替代料（不在目录中）
INA155U/2K5
✅ 直接替换📋 参考替代料（不在目录中）
INA141UA/2K5E4
✅ 直接替换📋 参考替代料（不在目录中）
INA154U
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →INA155E/250
✅ 直接替换📋 参考替代料（不在目录中）
INA155U 最大额定值与电气特性
| Product Type | CMOS instrumentation amplifier |
| Number of Channels | 1 circuit |
| 电源电压 | 5.5 V maximum single supply |
| Supply Topology | Single supply |
| Bandwidth | 550 kHz |
| Output Offset Voltage | 1 mV |
| 输出类型 | Rail-to-rail output |
| Input Type | Differential instrumentation-amplifier input |
| Technology | CMOS |
| 封装 | 8-pin SOIC |
| 安装类型 | Surface mount |
INA155U 8-pin soic 引脚配置指南
INA155U（8-pin soic 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： INA155U.
请参阅 数据手册 以查看完整引脚配置。
典型应用
INA155U 适用于 6 应用s: Low-Voltage Sensor Signal Conditioning, Portable Battery-Powered Measurement, ADC Input Amplification, Industrial Process Monitoring, Bridge and Strain-Sensor Interfaces, Precision Analog Signal Conditioning.
Low-Voltage Sensor Signal Conditioning
The INA155U fits low-voltage differential sensor front ends where the sensor produces a small signal referenced to a changing common-mode voltage. Place the two sensor outputs on the differential inputs, configure the gain according to the manufacturer’s supported resistor or internal-gain arrangement, and use the rail-to-rail output to preserve signal swing toward the positive supply. The verified 550 kHz bandwidth supports moderate-speed conditioning, while the 1 mV offset specification is relevant when the sensed quantity is small. Confirm input common-mode limits, source impedance, gain accuracy, and output loading before production release.
推荐
Portable Battery-Powered Measurement
The single-supply INA155U is appropriate for portable measurement systems operated from a low-voltage battery or regulated rail. Its verified 5.5 V maximum single-supply description supports compact analog front ends, and the CMOS implementation is suitable for power-conscious instrumentation. The rail-to-rail output can help retain usable dynamic range when the amplifier is powered from a 3.3 V or 5 V system, subject to the exact output-swing and load limits. Validate battery maximum, startup behavior, supply current, and common-mode headroom in the manufacturer datasheet.
推荐
ADC Input Amplification
The INA155U can condition a differential sensor or transducer signal before conversion by an ADC. The 550 kHz verified bandwidth provides response for many moderate-speed acquisition paths, while the instrumentation-amplifier architecture helps reject common-mode disturbance before digitization. Use the output to drive the ADC within its input range, adding an anti-alias filter when required by the signal bandwidth and sampling rate. Because ADC drive current, acquisition time, and the INA155U settling specifications were not included in the verified data, those values must be checked together before selecting the gain.
推荐
Industrial Process Monitoring
The INA155U can amplify low-level differential process signals in industrial monitoring equipment when the supply and common-mode requirements match its operating limits. Differential inputs help reduce sensitivity to shared supply and ground disturbances compared with a single-ended amplifier, while the 550 kHz bandwidth accommodates many sensor signals that do not require wide-band instrumentation-amplifier performance. Provide local supply decoupling, a quiet analog ground, and input protection appropriate to the transducer. Verify the complete industrial temperature, isolation, surge, and EMC requirements separately.
推荐
Bridge and Strain-Sensor Interfaces
The INA155U is a candidate for bridge or strain-sensor interfaces that generate a small differential voltage around a common-mode level. The instrumentation-amplifier topology is intended to amplify that differential result and suppress common-mode error, which is useful when the sensor output is small and the surrounding analog node is electrically noisy. Gain, input bias behavior, excitation settling, and allowable sensor impedance must be confirmed from the manufacturer datasheet. Add input filtering and ESD protection only after checking their capacitance, leakage, and noise effects on the measurement bandwidth.
推荐
Precision Analog Signal Conditioning
The INA155U can serve as a precision analog signal-conditioning stage when a differential source requires amplification before comparison, measurement, or further filtering. The verified 1 mV offset specification provides a concrete starting point for offset-error analysis, while rail-to-rail output increases available signal range near the upper supply limit. The 550 kHz bandwidth should be compared with the required settling time and noise bandwidth rather than treated as an all-purpose frequency limit. Confirm resistor values, gain accuracy, output load, and temperature drift before using it in a precision measurement chain.
推荐
工程参考数据： INA155U ——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 | INA155UA | INA155UG4 | INA155U/2K5 | INA141UA/2K5E4 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Product Type | CMOS instrumentation amplifier | Instrumentation amplifier | CMOS instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier |
| Number of Channels | 1 circuit | 1 channel | 1 channel | 1 channel | 1 channel |
| Output Architecture | Rail-to-rail output | Rail-to-rail output | Rail-to-rail output | Rail-to-rail output | Rail-to-rail output |
关键差异点
- Single-supply rail-to-rail-output architecture （对比 INA141UA/2K5E4)
- Verified 550 kHz bandwidth （对比 INA155UA)
- 1 mV offset specification （对比 INA154U)
设计说明
Keep the two differential input traces short, matched in length, and surrounded by a continuous ground reference where practical. Route feedback and gain-setting components close to the relevant device pins, and avoid sharing high-current return paths with the input reference. The verified data confirms a differential CMOS instrumentation amplifier but does not provide the exact pin names or recommended layout, so consult the official package drawing and datasheet before final routing.
Place the required supply-decoupling capacitors immediately at the device supply and ground pins, and keep the analog supply path separate from switching-node and motor-return currents wherever possible. The verified 5.5 V maximum single-supply specification must not be treated as a recommended operating point; check absolute maximum and recommended supply limits. Also verify output loading and rail-to-rail behavior under the actual load rather than assuming full rail swing.
Treat the sensor source impedance, differential input capacitance, and feedback network as a matched system. Excess source imbalance can degrade common-mode rejection, while long or asymmetric traces can add phase delay and reduce the effective bandwidth below the verified 550 kHz family specification. Add filtering only after calculating its effect on settling and signal bandwidth, and validate the complete channel with the intended sensor and ADC or downstream load.
合规信息
The supplied verified data confirms the manufacturer, product type, package, supply class, bandwidth, offset, and distributor listings, but does not provide explicit RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification statements.