INA133UA - 1.5 MHz Precision Difference Amplifier | Texas Instruments
Référence : INA133UA ✗ Fin de vieINA133UA Présentation
A difference amplifier is an operational-amplifier-based circuit that responds to the voltage difference between two input terminals rather than to either input voltage independently. This makes the INA133UA suitable for current-sense, bridge-sensor, instrumentation, and high-speed measurement circuits where common-mode voltage can be substantially larger than the wanted differential signal. The 1.5 MHz bandwidth provides a useful compromise between response speed and precision, while the specified 450 uV offset and 0.05% maximum gain error help establish the accuracy of the amplified result.
The INA133UA operates with single or dual power supplies according to the manufacturer family information. Its 0.95 mA power consumption is suitable for compact, low-power signal-conditioning equipment when compared with general-purpose implementations that consume more current. The 8-pin SOIC package permits conventional surface-mount assembly and provides a straightforward footprint for designs that require one precision differential amplifier.
Typical uses include bridge-based pressure and load sensing, current measurement in power-conversion systems, industrial instrumentation, and high-speed analog signal conditioning. In each case, the input common-mode range, supply voltage, output swing, gain-setting method, and required common-mode rejection must be checked against the complete manufacturer datasheet before implementation.
Designers should pay particular attention to input filtering, resistor matching, supply bypassing, and the output reference connection. The INA133UA is not automatically interchangeable with every 8-pin amplifier because package compatibility alone does not guarantee electrical compatibility. Verify the exact pinout, supply ratings, common-mode limits, gain configuration, and stability requirements before releasing a PCB.
This product page combines the verified Texas Instruments product description, distributor package information, price reference, and cross-reference results with practical selection guidance for engineers evaluating a drop-in replacement.
Alternatives de remplacement direct pour INA133UA — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec INA133UA (même facteur de forme et même empreinte) — différant par Offset Voltage Drift, Package.
INA133U
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →INA149AIDR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
INA133UA Valeurs maximales et caractéristiques électriques
| Product Type | Precision difference amplifier |
| Bandwidth | 1.5 MHz |
| Maximum Offset Voltage | 450 uV |
| Power Consumption | 0.95 mA |
| Maximum Gain Error | 0.05% |
| Offset Voltage Drift | ±5 uV/°C maximum |
| Tension d'alimentation | ±15 V |
| Plage de température de fonctionnement | -40 °C to +85 °C |
| Boîtier | 8-pin SOIC, 3.9 mm width |
| Package Length | 4.91 mm |
| Package Height | 1.5 mm maximum |
| Type de montage | Surface mount |
| Amplifier Count | 1 |
| Differential Input | Yes |
| Unity-Gain Configuration | Supported |
| Statut RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | unknown |
Configuration des broches de INA133UA
| Broche 1 | 1 — Pin function not available in the supplied verified data |
| Broche 2 | 2 — Pin function not available in the supplied verified data |
| Broche 3 | 3 — Pin function not available in the supplied verified data |
| Broche 4 | 4 — Pin function not available in the supplied verified data |
| Broche 5 | 5 — Pin function not available in the supplied verified data |
| Broche 6 | 6 — Pin function not available in the supplied verified data |
| Broche 7 | 7 — Pin function not available in the supplied verified data |
| Broche 8 | 8 — Pin function not available in the supplied verified data |
Applications typiques
INA133UA convient pour 6 applications: Bridge Sensor Signal Conditioning, Current-Sense Amplification, Industrial Instrumentation, High-Speed Analog Signal Conditioning, Power-Conversion Monitoring, Portable Measurement Equipment.
Bridge Sensor Signal Conditioning
The INA133UA fits bridge-based pressure, strain, and load sensing because it amplifies the differential bridge output while rejecting common-mode voltage. Its specified 1.5 MHz bandwidth is higher than required for many slow mechanical sensors, providing margin for filtering and signal-chain bandwidth. The 450 uV maximum offset and 0.05% maximum gain error are the important accuracy limits to evaluate against the bridge excitation and smallest expected measurement. Use the manufacturer application guidance to select resistor values, confirm the input common-mode range, and account for offset drift of ±5 uV/°C across the operating environment.
Recommandé
Current-Sense Amplification
The INA133UA is appropriate for current-sense monitoring where a small shunt voltage is measured across a common-mode power rail. The 1.5 MHz bandwidth can preserve fast current transients, while the 450 uV offset specification determines the smallest shunt voltage that can be resolved accurately. The 0.95 mA power consumption is useful in compact monitoring electronics, although the supply configuration and common-mode limits must be checked carefully. Use Kelvin connections where possible and verify the output swing, supply range, and gain-network calculations in the manufacturer datasheet.
Recommandé
Industrial Instrumentation
The INA133UA supports industrial measurement systems that need a compact, low-power differential front end. Its specified 1.5 MHz bandwidth is adequate for many sensor and process-control signals, while the extended -40 °C to +85 °C operating range supports a broad range of ambient environments. Accuracy planning should include the 450 uV offset, 0.05% gain error, and ±5 uV/°C offset drift. The 8-pin SOIC package also simplifies conventional industrial PCB assembly, provided the complete pinout and grounding arrangement are verified against the manufacturer documentation.
Recommandé
High-Speed Analog Signal Conditioning
The INA133UA is useful when a differential analog signal must be conditioned before conversion or further processing. Its 1.5 MHz bandwidth provides substantially more signal bandwidth than many precision instrumentation amplifiers, while the single-amplifier configuration keeps the circuit compact. Designers should still verify input common-mode range, output swing, slew rate, and stability for the selected gain. Resistor matching, short trace geometry, and proper bypassing are important because the package-level pinout and the manufacturer application circuit should govern the layout rather than generic SOIC conventions.
Recommandé
Power-Conversion Monitoring
The INA133UA can monitor differential feedback or shunt information in power-conversion systems where the signal of interest is small relative to the operating voltage. The specified bandwidth of 1.5 MHz supports monitoring of relatively fast transients, and the 450 uV offset sets an important floor for low-current measurements. The 0.95 mA operating current helps limit auxiliary-circuit consumption. Before deployment, confirm that the converter’s common-mode voltage remains within the amplifier limits and that the output does not clip at the selected supply voltage and gain.
Recommandé
Portable Measurement Equipment
The INA133UA is a candidate for portable and field measurement equipment because its 0.95 mA power consumption is low for a precision difference amplifier with 1.5 MHz bandwidth. The 8-pin SOIC package supports compact assembly, and the -40 °C to +85 °C range is useful for products exposed to changing ambient conditions. Battery-powered designs must still include regulator headroom, filtering, and input protection without loading the sensor excessively. Verify the complete electrical limits, particularly common-mode range and output swing, before selecting resistor values.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour INA133UA — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | INA133U | INA149AIDR |
|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
Principaux différenciateurs
- Higher verified bandwidth than the INA149AIDR comparator (vs INA149AIDR)
- Precision offset specification (vs INA149AIDR)
- Low-power precision performance (vs INA133U)
- Documented gain accuracy (vs INA149AIDR)
Notes de conception
The verified INA133UA power specification is 0.95 mA, but the actual supply dissipation depends on the selected single or dual supply configuration, output load, and quiescent-current conditions. Place the decoupling capacitors close to the supply pins and follow the manufacturer’s recommended capacitor values and layout. Do not infer the maximum allowable supply voltage from the listed ±15 V condition without checking the complete datasheet limits and operating ratings.
Use a compact, symmetric differential-input layout and keep the external gain-setting resistors close to the amplifier pins where the manufacturer circuit permits. High-impedance input nodes are susceptible to leakage, contamination, and parasitic capacitance. Confirm the INA133UA pin functions from the manufacturer datasheet before assigning PCB labels; the supplied verified data confirms the 8-SOIC package but does not provide the individual pin names.
The INA149AIDR is not a bandwidth-equivalent replacement for the INA133UA: the verified comparison lists 500 kHz for the INA149AIDR versus 1.5 MHz for the INA133UA. Even though both use an 8-SOIC package, package matching does not guarantee common-mode range, offset, gain accuracy, or output-swing compatibility. Validate every electrical parameter and confirm the physical pinout before substituting either candidate.
For a 1.5 MHz difference amplifier, route the differential pair with matched geometry and minimize exposure to noisy switching nodes. The verified data does not provide slew rate, common-mode range, output swing, or noise figures, so these must be obtained from the manufacturer datasheet. Add filtering where needed, but ensure that the filter does not introduce an unacceptable phase shift into the intended measurement bandwidth.
Informations de conformité
Compliance data was not explicitly provided in the verified web data or internal database data. Do not infer RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status from the manufacturer or distributor pages alone.
