INA148UA - ±200V Differential Amplifier | Texas Instruments
部品番号: INA148UA ✓ 生産中INA148UA 概要
A difference amplifier is an analog signal-conditioning IC that subtracts two input voltages and amplifies the resulting differential signal. The INA148 belongs to the instrumentation-amplifier application class, uses a monolithic precision bipolar operational amplifier, and incorporates a thin-film resistor network. Its internal unity-gain architecture gives it a gain of one, so the output represents the difference between the two inputs while rejecting voltage shared by both.
Key features include a ±200 V common-mode input range, 100 kHz bandwidth, 1 V/µs slew rate, 5 mV input offset voltage, and a minimum common-mode rejection ratio of 70 dB. The electrical operating range is 2.7 V to 36 V, supporting both low-voltage signal conditioning and conventional industrial supply systems. The listed operating-temperature range extends from −55 °C to +125 °C.
The high common-mode capability allows small sensor or shunt signals to be measured when both input nodes are riding on a substantially larger voltage. The thin-film network supports stable precision matching, while the bipolar amplifier and unity-gain configuration provide a straightforward implementation for high-side current sensing, industrial measurement, battery monitoring, and grounded signal acquisition. The 100 kHz bandwidth is appropriate for relatively slow sensor and control signals rather than wideband waveform systems.
Typical uses include motor and solenoid current feedback, power-converter telemetry, industrial process monitoring, automotive battery sensing, and measurement of small voltages across high-side shunt resistors. The INA148UA is particularly useful when the signal of interest is small but its common-mode voltage is large, and when the system needs an output referenced to a low-voltage analog or mixed-signal domain.
Designers should verify input and output voltage limits, external input protection, supply bypass capacitance, and the common-mode range across temperature before applying the device to a new high-voltage design. Differential input filtering and careful routing are also important when long sensor leads or switching power stages are present. The INA148UA does not provide isolation, so its input and supply ratings must be satisfied by the surrounding system.
This product page combines verified manufacturer and distributor information with application-oriented engineering guidance, package details, pricing context, and a replacement-oriented comparison. It is intended to help engineers determine whether the INA148UA fits a high-common-mode measurement design and to identify the limitations of any proposed substitute.
ドロップイン代替品: INA148UA — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: INA148UA （同一形状・フットプリント） — 相違点: Bandwidth, Package, Product Type.
INA148UAG4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA148QDRQ1
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA146UAG4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA143U
✅ ドロップイン価格はお問い合わせください
データシートを見る →INA128U
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA148UA 最大定格＆電気的特性
| Product Type | Precision unity-gain difference amplifier |
| Common-Mode Voltage Range | ±200 V |
| Differential Gain | 1 |
| Bandwidth | 100 kHz |
| Slew Rate | 1 V/µs |
| Input Offset Voltage | 5 mV |
| Minimum Common-Mode Rejection Ratio | 70 dB |
| Minimum Supply Voltage | 2.7 V |
| Maximum Supply Voltage | 36 V |
| Minimum Operating Temperature | −55 °C |
| Maximum Operating Temperature | +125 °C |
| Amplifier Count | 1 |
| Internal Amplifier Implementation | Monolithic precision bipolar operational amplifier |
| Resistor Network | Thin-film resistor network |
| パッケージ | 8-pin SOIC |
| 実装タイプ | Surface mount |
| Moisture Sensitivity Level | MSL 3, 168 hours |
INA148UA 8-pin soic ピン配置ガイド
INA148UA (8-pin soic パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: INA148UA.
詳細は データシート をご参照ください。
主な用途
INA148UA の用途: 6 件s: High-Side Current Sensing, Industrial Process Measurement, Automotive Battery Monitoring, Motor and Solenoid Feedback, Power Converter Telemetry, Ground-Referenced Sensor Acquisition.
High-Side Current Sensing
The INA148UA fits high-side current sensing when a small shunt voltage must be measured on a signal node with a large common-mode voltage. Its ±200 V common-mode range allows the difference amplifier to operate around high-voltage industrial or automotive buses, while the unity gain preserves the shunt-voltage scale for an ADC. The verified 100 kHz bandwidth is suitable for current feedback and power-control loops that are not intended to capture very fast edges. Designers should keep both inputs within the common-mode limits, use the 5 mV offset specification in the error budget, and place protection or filtering ahead of the pins when the bus contains switching transients.
おすすめ
Industrial Process Measurement
The INA148UA is useful for industrial process measurements in which a sensor or bridge produces a small differential voltage relative to a much larger excitation or ground potential. Its ±200 V common-mode input rating and unity-gain architecture simplify acquisition around high-voltage process equipment. The 70 dB minimum common-mode rejection helps suppress voltage shared by the two inputs, while the 100 kHz bandwidth supports process signals within the industrial control bandwidth. The supply range of 2.7 V to 36 V allows local conditioning from standard low-voltage or industrial rails. Protection, isolation boundaries, and hazardous-area requirements must be addressed separately because the INA148UA itself is not an isolation device.
おすすめ
Automotive Battery Monitoring
The INA148UA can support battery-pack monitoring when a cell or shunt voltage is measured with a high common-mode potential relative to the measurement electronics. Its ±200 V common-mode capability provides tolerance for high-voltage automotive test conditions, and the 5 mV input offset specification is relevant to battery-state estimation and current reporting. The 100 kHz bandwidth and 1 V/µs slew rate are suitable for slower pack-control signals but not necessarily for high-frequency ripple analysis. Automotive production use should specifically evaluate the automotive-qualified INA148QDRQ1 and verify the required operating-temperature range, AEC-Q100 status, and functional-safety expectations from current TI documentation.
おすすめ
Motor and Solenoid Feedback
The INA148UA supports motor and solenoid feedback systems that require measurement of a small differential signal riding on a high-side supply or switching node. The ±200 V common-mode range offers headroom for automotive, industrial, and power-converter environments, while common-mode rejection reduces errors from voltage shared at the two inputs. With a unity gain and 100 kHz bandwidth, it can condition feedback for current-mode controllers or diagnostics without adding closed-loop gain. Input clamps may still be required because inductive transients can exceed steady-state bus voltage. Layout should minimize trace length, use a quiet ground reference, and verify the amplifier output remains within its supply rails at the minimum detected differential voltage.
おすすめ
Power Converter Telemetry
The INA148UA is applicable to power-converter telemetry where the controller must observe a small voltage difference across a high-side element while the switch node swings over a wide range. Its ±200 V common-mode rating enables measurement at voltages above the INA148UA supply rails, and unity gain keeps the output directly comparable to the sensed differential voltage. The 100 kHz bandwidth accommodates bandwidth-limited control and monitoring signals, whereas the 1 V/µs slew rate supports rapid transitions through the amplifier. Design work should include common-mode transient analysis, input clamp selection, output-range verification, and decoupling near the supply pins. The device does not replace an isolated measurement front end when galvanic separation is required.
おすすめ
Ground-Referenced Sensor Acquisition
The INA148UA can acquire small ground-referenced sensor outputs even when the measurement system operates from a low-voltage supply, because its input common-mode range is substantially wider than its 2.7 V to 36 V supply range. This separation is helpful in sensor interfaces where a downstream ADC cannot tolerate the sensor’s higher reference voltage. The unity-gain structure avoids external gain-setting resistors, and the thin-film resistor network supports precise subtraction of the two input voltages. The 5 mV offset and at least 70 dB CMRR must be included in the acquisition error budget. Engineers should confirm the exact pin functions and reference behavior from the manufacturer datasheet before finalizing the schematic and PCB footprint.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: INA148UA — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | INA148UAG4 | INA148QDRQ1 | INA146UAG4 | INA143U | INA128U |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
主な差別化要因
- Exceptionally wide common-mode input range （vs INA128U)
- Automotive-family ordering option （vs INA148UAG4)
- Verified precision and dynamic specifications （vs INA146UAG4)
設計ノート
Confirm that both input pins remain within the ±200 V common-mode range under worst-case operating conditions and that the output stays between the powered rails. The INA148UA operates from 2.7 V to 36 V, so a high-side measurement can be sensed even when its common-mode voltage is much higher than the local supply. Add external input clamps where switching spikes or fault conditions can exceed the input ratings; the common-mode rating is not the same as an absolute maximum voltage or transient withstand rating.
Route the two high-impedance input connections as a matched, compact pair and minimize their exposed length to reduce pickup of noise and differences in parasitic capacitance. Place input protection and filtering components close to the relevant pins, and keep the amplifier ground connection short and electrically quiet. Because the device performs subtraction at unity gain, unequal input impedances or propagation delays can convert unwanted common-mode energy into differential error; identical input networks and careful grounding are therefore important.
Do not treat the INA148UA as an isolation amplifier, surge protector, or unrestricted input clamp. The verified ±200 V figure describes common-mode operating capability, while the source excerpts do not establish the absolute maximum input voltage, isolation rating, or transient survivability. Check the manufacturer datasheet for absolute maximum ratings, input-current limits, output-swing limits, reference-pin behavior, and supply sequencing before connecting the device to an unclamped high-voltage node.
コンプライアンス情報
The supplied excerpts do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The standard INA148UA is not identified as an automotive-qualified variant; INA148QDRQ1 is the automotive-oriented ordering candidate, but its formal AEC-Q100 status should be verified from current TI documentation.