INA188ID - 36V Zero-Drift Instrumentation Amplifier | Texas Instruments
MPN： INA188ID ✓ 啟用中INA188ID 概覽
An instrumentation amplifier is a specialized differential amplifier that measures a small voltage difference between two inputs while offering high input impedance, common-mode rejection, and gain accuracy. The INA188 belongs to the zero-drift instrumentation-amplifier family, a subtype of precision analog amplifiers used for sensor interfaces, current measurement, biomedical instrumentation, and industrial process control. Its internal auto-zeroing techniques reduce offset voltage and offset drift, making it more suitable for slowly varying precision signals than a conventional amplifier whose offset moves with temperature.
Key features include a 36 V maximum supply voltage, rail-to-rail output operation, gains from 1 to 1000, and a maximum input offset voltage of 55 µV as reported by the comparative distributor data. The reference pin supports output level shifting in single-supply systems and offset calibration. A single gain-setting resistor simplifies design-in, while the zero-drift architecture addresses offset stability in temperature, bridge, and slow-current-measurement systems. The 8-pin SOIC package also supports conventional surface-mount assembly.
The gain relationship G = 1 + (50 kΩ/RG) allows the sensor interface to be scaled without an active gain network. For example, a 1 kΩ gain resistor produces a nominal gain of 51, while a 50 Ω resistor produces a nominal gain of 1001 before rounding and standard gain-error considerations are applied. The reference input provides an additional analog node for systems that cannot shift their output entirely in the analog domain. Designers should preserve the instrumentation-amplifier grounding and input-common-mode requirements when evaluating usable signal range.
Typical uses include strain-gauge and load-cell bridges, RTD and thermocouple signal conditioning, precision current-shunt measurements, battery monitoring, and low-level sensor acquisition. The INA188ID is particularly appropriate when low offset and low drift matter more than wideband response. In bridge systems, its differential input arrangement and adjustable gain can amplify the small bridge imbalance while limiting sensitivity to common-mode voltage. In battery-powered equipment, the reference pin can place the output within the usable range of a single-supply analog-to-digital converter.
The primary design consideration is ensuring that input and output common-mode voltages remain inside the device's operating limits at every gain and supply condition. Gain-set resistor tolerance contributes directly to gain accuracy, so precision resistors may be required for calibrated measurements. Input filtering, source impedance, reference-pin routing, and exposed-area thermal management should also be evaluated before production release.
This product page consolidates manufacturer specifications, verified distributor pricing, package details, comparison data, and practical design guidance. It also distinguishes verified drop-in candidates from broader functional alternatives so engineers can assess footprint, gain-setting, voltage-range, and precision differences before changing a production design.
直接替換替代品，適用於 INA188ID — 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： INA188ID （相同外形與佔位） — 差異在於 Amplifier Type, Gain Equation, Number of Channels, Output Type, Package.
INA128ID
✅ 直接替換📋 參考替代品（不在目錄中）
INA828ID
✅ 直接替換📋 參考替代品（不在目錄中）
INA821ID
✅ 直接替換📋 參考替代品（不在目錄中）
INA188ID 最大額定值與電氣特性
| Amplifier Type | Single-channel zero-drift instrumentation amplifier |
| Maximum Supply Voltage | 36 V |
| Minimum Supply Voltage | 4 V |
| Minimum Gain | 1 V/V |
| Maximum Gain | 1000 V/V |
| Gain Equation | G = 1 + (50 kΩ/RG) |
| Input Offset Voltage | ±55 µV maximum |
| 輸出類型 | Rail-to-rail output |
| 工作溫度範圍 | -40°C to +125°C |
| Gain-Setting Method | 1 external resistor |
| Reference Input | Available for level shifting and offset calibration |
| Number of Channels | 1 channel |
| 封裝 | 8-pin SOIC, 3.90 mm width |
| 安裝類型 | Surface mount |
INA188ID 8-pin soic, 3.90 mm width 腳位配置指南
INA188ID（8-pin soic, 3.90 mm width 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： INA188ID.
請參閱 資料表 以查看完整腳位配置。
典型應用
INA188ID 適用於 6 應用s: Strain-Gauge and Load-Cell Bridge Measurement, RTD and Temperature Sensor Conditioning, Precision Current-Shunt Monitoring, Battery Voltage and State-of-Charge Sensing, Industrial Process Sensor Interface, Portable Instrumentation and Diagnostic Equipment.
Strain-Gauge and Load-Cell Bridge Measurement
The INA188ID fits low-level bridge measurements because it combines a differential input with selectable gain from 1 to 1000 and zero-drift offset behavior. A Wheatstone bridge powered by a stable reference can produce only a small differential voltage when strain is low, and the INA188ID amplifies that imbalance while rejecting much of the bridge's common-mode voltage. The external gain resistor follows G = 1 + (50 kΩ/RG), simplifying adjustment. Engineers should verify the bridge excitation range, input common-mode limits, reference configuration, and gain-resistor tolerance. The ±55 µV maximum input offset listed in the verified comparison data is especially relevant because bridge output changes can also be small. Zero-drift operation helps preserve measurement stability as the bridge temperature changes.
推薦
RTD and Temperature Sensor Conditioning
The INA188ID is suitable for precision temperature-sensor interfaces where the required signal is small and measurement drift matters. Texas Instruments identifies temperature measurement as a primary INA188 application, and the zero-drift architecture addresses offset changes with temperature. The reference pin can shift the output into the usable range of a single-supply converter or analog-to-digital converter. Gain is established with one resistor using G = 1 + (50 kΩ/RG), allowing an RTD bridge to use a convenient scale factor. For an industrial temperature-measurement channel, check excitation accuracy, self-heating, lead resistance, input common-mode range, and the ADC's input range. Calibration should include the gain resistor and sensor system rather than relying on offset voltage alone.
推薦
Precision Current-Shunt Monitoring
The INA188ID can measure the small differential voltage produced by a current shunt while providing selectable gain up to 1000. Its differential input supports measurement in a system containing substantial common-mode voltage, and the zero-drift architecture is appropriate for slow or changing current levels where offset drift would otherwise corrupt the result. Designers can place the shunt in the high-side or low-side return path and select RG using G = 1 + (50 kΩ/RG). The design must confirm that both shunt terminals remain within the amplifier's input common-mode range and that the output does not exceed its rail limits at the maximum expected current. Kelvin connections to the shunt reduce parasitic voltage error, while filtered differential routing helps reject switching noise.
推薦
Battery Voltage and State-of-Charge Sensing
The INA188ID can condition small voltage changes associated with battery sensing when the system needs better offset behavior than a conventional general-purpose amplifier provides. Its gain may be set from 1 to 1000 using the 50 kΩ resistor relationship, and the reference pin permits output level shifting in single-supply equipment. The 36 V maximum supply capability supports higher-voltage industrial battery systems, although the actual common-mode and output ranges must remain within the operating limits for the selected configuration. A practical design should use low-leakage resistors, controlled reference routing, and an ADC whose input range matches the conditioned output. Offset calibration and temperature compensation should be verified across the battery's full operating range, particularly where cell voltage changes are small.
推薦
Industrial Process Sensor Interface
The INA188ID is appropriate for conditioning low-level industrial sensor outputs that require stable offset performance and adjustable gain. Examples include pressure transducers, force sensors, and resistive detectors whose differential outputs are measured in the presence of a larger common-mode voltage. The device's single-resistor gain setting, G = 1 + (50 kΩ/RG), reduces analog component count and makes gain selection straightforward. The reference input offers an additional degree of freedom when the conditioned signal must be biased for a single-supply ADC. Engineers must check the sensor excitation, common-mode range, output swing, noise bandwidth, and protection network. EMI filtering and a solid ground reference are important in factory environments, while the zero-drift architecture helps preserve calibration stability over temperature.
推薦
Portable Instrumentation and Diagnostic Equipment
The INA188ID supports portable measurement systems that combine low-level analog inputs with compact, low-power digital hardware. Its 8-pin SOIC package simplifies surface-mount assembly, while the rail-to-rail output and reference input provide flexibility when operating from a single supply. Gains up to 1000 allow weak physiological, resistive, or bridge signals to be brought into a useful ADC range using one external resistor. Because the device uses zero-drift techniques, it is better suited to static or slowly varying measurements than to wideband signal acquisition. Layout should keep the gain and reference resistors close, provide a quiet ground path, and include protection appropriate to externally connected sensors. The system designer should also verify startup behavior, supply sequencing, and whether any input or output state needs to remain safe during power-down.
推薦
推薦產品摘要
工程參考資料，適用於 INA188ID — 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 | INA128ID | INA828ID | INA821ID |
|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Offset Drift Architecture | Zero-drift | Conventional drift; numerical difference unavailable | Zero-drift; numerical difference unavailable | Zero-drift; numerical difference unavailable |
| Number of Channels | 1 channel | 1 channel | 1 channel | 1 channel |
主要差異化特點
- Zero-drift precision architecture (對比INA128ID)
- Rail-to-rail output operation (對比INA821ID)
- Single-resistor gain programming (對比INA828ID)
設計說明
Do not treat a shared SOIC-8 footprint as proof of electrical equivalence. The INA188ID uses G = 1 + (50 kΩ/RG), so before installing INA128ID, INA828ID, or INA821ID, verify the alternative's gain equation and recalculate RG. Also compare input common-mode range, output swing, offset drift, gain error, and supply limits against the original design. The verified data does not quantify every difference, so a bench-level substitution check is required before production use.
Place the gain-setting resistor close to the RG connection and use a low-noise reference node because both can influence gain error and output stability. Route the differential inputs as a compact, matched pair and keep them away from switching nodes and high-current return paths. For bridge or shunt sensing, use Kelvin connections where possible so connector contacts and copper-trace voltage do not become part of the measured signal.
The verified maximum supply voltage is 36 V, but that limit does not guarantee correct operation at every supply combination. Check the input common-mode range and output swing against the minimum and maximum supply voltages used in the design. In single-supply systems, drive the reference pin only within its permitted range and account for reference current when selecting its source impedance. Add input protection only after confirming that it does not degrade offset accuracy or noise performance.
The INA188ID is intended for precision signal measurement rather than unrestricted high-bandwidth operation. Match input impedances when practical, place any input filters symmetrically across the differential pair, and filter ahead of the amplifier if bandwidth reduction is acceptable. The zero-drift architecture improves offset stability, but it does not remove noise, gain error, reference error, or errors introduced by the sensor and excitation source.
合規資訊
The supplied verified excerpts do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. No compliance claim has been inferred.
