INA155UA - 550 kHz Single-Supply CMOS Instrumentation Amp | TI
MPN： INA155UA ✓ 啟用中INA155UA 概覽
An instrumentation amplifier is a differential-input analog amplifier that combines high input impedance, accurate gain setting, and common-mode rejection into one integrated device. The INA155UA belongs to the instrumentation amplifier category, which is part of the broader amplifier IC and analog signal-processing hierarchy. Its rail-to-rail output allows the output to approach the supply rails, while its CMOS construction supports low-voltage operation and compact analog designs.
The INA155UA provides adjustable gain through external resistors, with the manufacturer describing the device as a 1 mV-offset, 550 kHz rail-to-rail CMOS instrumentation amplifier. The 550 kHz bandwidth is particularly useful for signals that require more bandwidth than a precision-only instrumentation amplifier but do not require the bandwidth of a high-speed differential ADC frontend. The 6.5 V/us slew rate listed in distributor search data helps characterize its ability to respond to changing input conditions.
The device is suited to low-voltage sensor conditioning, including bridge and strain-gauge signals, because its differential input architecture rejects common-mode noise when the common-mode voltage remains within the specified input range. It can also be used with current-shunt measurements, where the instrumentation amplifier converts a small differential voltage across a shunt into a larger single-ended signal. The rail-to-rail output is useful in systems where the available output headroom is limited.
Typical applications include industrial process measurement, portable instrumentation, battery-powered sensor interfaces, current monitoring, and low-voltage data acquisition. When designing around the INA155UA, confirm the complete input common-mode range, output swing, gain resistor values, supply decoupling, and operating temperature limits against the manufacturer datasheet. Pay particular attention to the distinction between rail-to-rail output operation and rail-to-rail input operation, because only the output characteristic is explicitly identified in the provided verified data.
This product record combines verified manufacturer and distributor information, package details, pricing references, replacement guidance, and application-oriented engineering notes. The provided search results confirm the INA155UA's 5.5 V single-supply classification, 550 kHz bandwidth, 1 mV offset specification, rail-to-rail output, CMOS construction, 2.5 V to 6 V supply range, and 8-pin SOIC package.
直接替換替代品，適用於 INA155UA — 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： INA155UA （相同外形與佔位） — 差異在於 Product Type.
INA155UA/2K5
✅ 直接替換📋 參考替代品（不在目錄中）
INA155UA/2K5G4
✅ 直接替換📋 參考替代品（不在目錄中）
INA155UA 最大額定值與電氣特性
| Product Type | Single-supply CMOS instrumentation amplifier |
| Number of Circuits | 1 circuit |
| Supply Voltage Range | 2.5 V to 6 V |
| Nominal Single-Supply Voltage | 5.5 V |
| Bandwidth | 550 kHz |
| Input Offset Voltage | 1 mV |
| Output Swing | Rail-to-rail output |
| Slew Rate | 6.5 V/us |
| Amplifier Type | Instrumentation amplifier |
| Semiconductor Technology | CMOS |
| 封裝 | 8-pin SOIC |
| 安裝類型 | Surface mount |
INA155UA 8-pin soic 腳位配置指南
INA155UA（8-pin soic 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： INA155UA.
請參閱 資料表 以查看完整腳位配置。
典型應用
INA155UA 適用於 6 應用s: Low-Voltage Current-Shunt Sensing, Industrial Sensor Signal Conditioning, Portable Battery-Powered Instrumentation, Data-Acquisition Front End, Bridge and Strain-Gauge Measurement, Low-Voltage Audio Signal Interface.
Low-Voltage Current-Shunt Sensing
The INA155UA fits low-voltage shunt monitoring because it combines a differential-input instrumentation-amplifier architecture with 550 kHz bandwidth and a 2.5 V to 6 V supply range. Place the shunt voltage across the differential inputs and set the gain with the manufacturer's specified external resistors. The 6.5 V/us slew rate allows the output to track changing current waveforms, while the rail-to-rail output improves utilization of limited signal headroom. Designers should verify that the maximum shunt voltage and common-mode level stay within the input limits, and should place supply and reference-decoupling capacitors close to the device.
推薦
Industrial Sensor Signal Conditioning
The INA155UA is appropriate for conditioning low-level differential outputs from industrial sensors when the system supply is limited to 6 V. Its 1 mV input offset specification and instrumentation-amplifier topology help preserve small sensor signals, while the 550 kHz bandwidth supports more dynamic measurement signals than a very slow precision-only amplifier. The 8-SOIC package supports conventional surface-mount assembly, and the rail-to-rail output can drive downstream ADC front ends. Confirm the sensor output range, required gain, common-mode voltage, and ADC input range before finalizing the external resistor network.
推薦
Portable Battery-Powered Instrumentation
The INA155UA supports portable and battery-powered instrumentation because it operates from a supply as low as 2.5 V and uses a CMOS instrumentation-amplifier implementation. The low-voltage operation leaves more of the available supply range available for the measured signal, and the rail-to-rail output helps maximize usable analog swing in compact systems. Its 1 mV offset is relevant when scaling small sensor or shunt signals, while the 550 kHz bandwidth supports moderately responsive measurements. Power-budget calculations must include the device supply current, which is not available in the provided verified data and therefore requires confirmation from the datasheet.
推薦
Data-Acquisition Front End
The INA155UA can serve as the analog front end of a low-voltage data-acquisition system by converting a differential sensor signal into a single-ended voltage suitable for an ADC. Its 550 kHz bandwidth accommodates moderate-speed acquisition channels, and its rail-to-rail output can reduce signal loss near the supply limits. The 1 mV input offset value is an important selection criterion when the measured signal is small. Before choosing it, verify the ADC settling requirements, acquisition bandwidth, output drive, input common-mode range, and anti-alias filtering; the provided data does not establish a specific ADC companion.
推薦
Bridge and Strain-Gauge Measurement
The INA155UA is a candidate for bridge or strain-gauge signal conditioning when the excitation and measurement system operate at low voltage. The differential input topology supports measurement of small imbalances generated by a sensor bridge, while adjustable external feedback resistors establish the required gain. Its 1 mV offset specification helps define the floor for small-signal measurements, and the rail-to-rail output can improve dynamic range in compact sensor nodes. Engineers must confirm that bridge excitation voltage, input bias behavior, common-mode range, gain error, and power consumption are acceptable; several of these values are not present in the supplied verified snippets.
推薦
Low-Voltage Audio Signal Interface
The INA155UA can condition small differential audio or communication signals in low-voltage equipment because distributor data describes it as a CMOS instrumentation amplifier optimized for single-supply operation. Its 550 kHz bandwidth covers audio-band and other moderate-frequency signals, and the rail-to-rail output allows operation near the available supply limits. The differential architecture can help reject common-mode noise when the signal path permits it. Designers should still evaluate input offset, gain accuracy, output distortion, noise, common-mode rejection, and the signal source impedance against the complete datasheet, since those detailed limits are not included in the provided source excerpts.
推薦
推薦產品摘要
工程參考資料，適用於 INA155UA — 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 | INA155UA/2K5 | INA155UA/2K5G4 | INA155U |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | SOP-8 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | Single-supply CMOS instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier | Single-supply, rail-to-rail-output CMOS instrumentation amplifier |
主要差異化特點
- Purpose-built single-supply instrumentation-amplifier function (對比INA155UA/2K5)
- Same verified 8-pin family format for PCB-focused substitution (對比INA155UA/2K5G4)
- Verified rail-to-rail-output positioning (對比INA155U)
設計說明
Design the INA155UA around the verified 2.5 V to 6 V supply range and place the required bypass capacitors directly beside the supply and ground pins. The provided excerpts do not state the recommended capacitor values or supply-current limit, so use the manufacturer datasheet for those values. Avoid allowing a nearby switching converter's transient or common-mode range to move the differential inputs outside their permitted operating region.
Keep the gain-setting and feedback resistors close to the corresponding INA155UA pins to reduce parasitic resistance, capacitance, and sensitivity to board contamination. Route the differential input pair together and away from clocks, high-current switching nodes, and inductive traces. Because the complete input common-mode range is unavailable in the supplied excerpts, do not use the rail-to-rail output statement as evidence that the inputs can safely reach either supply rail.
Use the INA155UA's 550 kHz bandwidth as an upper consideration when selecting gain and filtering. A high gain amplifies both the wanted signal and noise, while excessive bandwidth can admit unwanted high-frequency content. Set the gain with the manufacturer's specified resistor network and validate the complete signal chain with the intended source impedance, common-mode voltage, output loading, and required settling time.
Do not assume that INA155UA, INA155UA/2K5, INA155UA/2K5G4, and INA155U are interchangeable solely because they use an eight-pin family package. Verify the exact gain configuration, gain-setting requirements, temperature grade, qualification, tape-and-reel suffix, and pin-level ordering information for each suffix. The verified search snippets establish family and package relationships but do not quantify every electrical difference.
合規資訊
The provided verified snippets do not contain explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. No compliance claim has been inferred.