INA166UA - G=2000 Low-Noise Instrumentation Amplifier | TI
Référence : INA166UA ⚠ Dernier achatINA166UA Présentation
An instrumentation amplifier is a differential-input amplifier optimized for precision signal conditioning. It combines high input impedance, accurate differential gain, and common-mode rejection into one device, reducing the need for several precision operational amplifiers and matched resistors. The INA166 belongs to the broader amplifier IC hierarchy and is commonly used where sensors and transducers produce small outputs that must be measured accurately in the presence of larger common-mode voltages.
The INA166's fixed gain of 2000 increases a small differential input by a factor of 2000, making it useful for low-level microphone, hydrophone, industrial transducer, and medical-instrumentation signals. Its 450 kHz -3 dB bandwidth provides substantially more bandwidth than a traditional low-noise precision amplifier with a narrow frequency response. The 15 V/µs slew rate supports rapid signal transitions, while the 2.5 µA input bias current helps preserve accuracy with high-impedance sources.
The current-feedback architecture differentiates the INA166 from voltage-feedback instrumentation amplifiers that depend on a closed-loop gain resistor. Because its gain is internally set, the circuit does not require an external gain-setting resistor, reducing component count and avoiding sensitivity to external gain-resistor tolerance. The manufacturer describes the device as a very low-noise, low-distortion monolithic instrumentation amplifier intended for low-level signals.
Typical uses include precision microphone preamplification, hydrophone signal chains, industrial process-control inputs, bridge-sensor interfaces, and medical monitoring equipment. In each case, the differential input can reject common-mode interference while the fixed high gain converts a millivolt-level sensor output into a range suitable for an ADC or subsequent signal-processing stage.
Designers should verify the signal bandwidth and output swing against the datasheet limits, place input and feedback connections for low noise, and provide stable bypassing on the supply pins. The wide bandwidth and slew rate can excite output-stage distortion if the output signal approaches the available output-voltage range, so the gain and sensor bandwidth should be considered together rather than independently.
This product record combines the verified manufacturer and distributor data for the INA166UA with lifecycle information, pricing context, package details, application guidance, and a conservative replacement analysis. It distinguishes verified drop-in candidates from related ordering variants so engineers can assess PCB and supply-chain decisions without confusing a different gain option with an exact functional replacement.
Alternatives de remplacement direct pour INA166UA — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
INA166UA/2K5
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
INA166UAG4
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
INA166UA Valeurs maximales et caractéristiques électriques
| Product Type | 1 circuit instrumentation amplifier |
| Internal Gain | 2000 V/V |
| External Gain Resistor | Not required |
| -3 dB Bandwidth | 450 kHz |
| Slew Rate | 15 V/µs |
| Input Offset Voltage | 50 µV |
| Input Bias Current | 2.5 µA |
| Architecture | Current-feedback |
| Number of Circuits | 1 circuit |
| Nombre de broches | 14 pins |
| Boîtier | SOIC-14 (D) |
| Type de montage | Surface mount |
| Température de fonctionnement | -40 °C to +85 °C |
| Signal Type | Low-level differential input |
| Type de sortie | Single-ended instrumentation-amplifier output |
| Statut RoHS | unknown |
| REACH Status | unknown |
Guide de configuration des broches du INA166UA soic-14 (d)
Configuration des broches du INA166UA (boîtier soic-14 (d)). Ce composant analogique comporte des broches d'entrée, de sortie et d'alimentation. Consultez la fiche technique du fabricant pour les configurations des broches d'annulation d'offset, de compensation et d'activation. Idéal pour le conditionnement de signaux et les circuits amplificateurs.
Aucune donnée de brochage détaillée disponible pour INA166UA.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
INA166UA convient pour 6 applications: Precision Microphone Preamplification, Hydrophone Signal Conditioning, Industrial Transducer Measurement, Medical Monitoring Signal Chain, Precision Bridge-Sensor Interface, Dynamic Test and Measurement Amplifier.
Precision Microphone Preamplification
The INA166UA fits low-level microphone front ends because its fixed 2000 V/V gain can raise a small differential audio signal while its current-feedback architecture preserves a 450 kHz -3 dB bandwidth. The 15 V/µs slew rate provides additional headroom for dynamic transients, while the 2.5 µA input bias current is useful when the microphone or preamplifier has high source impedance. Place the amplifier close to the source and keep both differential input routes short and symmetrical. Because the device adds 2000 times the input voltage, verify that normal speech or music peaks do not drive the output beyond the usable swing. Its 14-pin SOIC package also supports conventional surface-mount assembly without requiring a high-gain external resistor.
Recommandé
Hydrophone Signal Conditioning
The INA166UA is appropriate for hydrophone signals because it combines 2000 V/V differential gain with a 450 kHz -3 dB bandwidth and low input bias current. This allows a small transducer output to be amplified without the narrow signal range associated with a low-bandwidth precision amplifier. The 15 V/µs slew rate supports faster acoustic events, and the current-feedback architecture provides strong dynamic response over a wide range of gain. In the circuit, use closely matched input routing and solid ground referencing to preserve differential performance and common-mode rejection. Confirm the sensor's usable bandwidth and the amplifier's output-swing limits before setting the system gain, because a 2000:1 ratio can convert small sensor peaks into voltages that consume the available output headroom.
Recommandé
Industrial Transducer Measurement
The INA166UA can condition low-output industrial transducers where useful differential signals coexist with larger common-mode levels. Its fixed 2000 V/V gain reduces the need for a separate gain stage, and the 50 µV input offset specification is important when the measured signal is small. The 450 kHz bandwidth covers faster process-control and dynamic-sensor signals, while the 2.5 µA input bias current helps avoid loading high-impedance sensor outputs. Place the amplifier near the transducer connector, maintain symmetrical differential routing, and bypass the supply pins locally. The design must check output voltage, noise, and settling behavior for the selected sensor bandwidth; a higher gain can improve signal-to-noise ratio but can also move peaks closer to the output limit.
Recommandé
Medical Monitoring Signal Chain
The INA166UA is suitable for medical monitoring front ends that must amplify small differential sensor signals while preserving bandwidth and dynamic response. The combination of 2000 V/V gain, 450 kHz -3 dB bandwidth, 15 V/µs slew rate, and 50 µV input offset supports amplification before an ADC or subsequent processing stage. Texas Instruments specifically identifies medical applications as benefiting from the INA166's low noise and low distortion. The fixed internal gain simplifies circuit construction, while the 14-pin SOIC package supports compact instrumentation. Engineers must still validate the complete signal chain for patient-safety requirements, isolation, leakage, noise, and output limits; those system-level properties are not established by the verified component excerpts.
Recommandé
Precision Bridge-Sensor Interface
The INA166UA can serve as the front end of a bridge-sensor interface when the bridge output is small and differential. Its internally set 2000 V/V gain provides a large signal swing before conversion, while the current-feedback topology maintains wide bandwidth and strong dynamic response. The 2.5 µA input bias current reduces potential loading of the bridge, and the 50 µV offset specification contributes to accuracy near the signal origin. Route the bridge and amplifier as a compact, symmetrical analog section to reduce differential pickup and ground potential differences. Because bridge excitation amplitude, output imbalance, and sensor bandwidth determine the usable dynamic range, the amplifier's output swing and distortion must be checked against the worst-case bridge signal rather than only the nominal value.
Recommandé
Dynamic Test and Measurement Amplifier
The INA166UA is appropriate for dynamic instrumentation where a small differential test signal must be amplified over a comparatively wide frequency range. Its 450 kHz -3 dB bandwidth and 15 V/µs slew rate offer more headroom than a narrow-band precision instrumentation amplifier, while the fixed 2000 V/V gain avoids an external gain-setting component. This combination is useful in laboratory and industrial test fixtures that need both sensitivity and response speed. Keep input and feedback paths short, provide local supply bypassing, and terminate unused inputs according to the manufacturer datasheet. The 50 µV input offset and 2.5 µA input bias current must be included in total measurement uncertainty, and the output must remain within its verified linear range for the largest expected test signal.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour INA166UA — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | INA166UA/2K5 | INA166UAG4 |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOIC-14 (D) | SOIC-14 (D) | SOIC-14 (D) |
| Product Type | Instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Principaux différenciateurs
- Lower gain than the related 2500 V/V option (vs INA166UA/2K5)
- Wide 450 kHz signal bandwidth (vs INA166UA/2K5)
- High slew rate for a low-noise instrumentation amplifier (vs INA166UAG4)
Notes de conception
Route the differential inputs as a short, symmetrical pair and keep the INA166UA close to the signal source. With a fixed gain of 2000 V/V, even small pickup differences between the two input paths are multiplied at the output. Place local supply-bypass components at the device's supply pins and avoid routing sensitive input traces beneath digital, clock, or switching-converter nodes. The exact exposed-pad and thermal-layout requirements should be taken from the complete manufacturer datasheet.
Do not assume that the 450 kHz -3 dB bandwidth guarantees low-distortion output across the full range or at every output amplitude. Check output swing, slew-rate demand, and distortion for the largest expected input. A 2000 V/V gain means that a modest input transient can move the output rapidly toward its limit. INA166UA/2K5 increases gain by 25% and can therefore consume additional output headroom, so it should not be substituted without recalculating downstream scaling.
Treat the analog input path as a high-impedance, high-gain signal path. Minimize connector-to-amplifier distance, maintain consistent grounding, and use a stable reference and decoupling arrangement. The verified input bias current is 2.5 µA, which can create an offset error when combined with a high source impedance. Calculate that contribution for each sensor and avoid leakage paths on the input nodes. Verify common-mode range and output behavior from the complete Texas Instruments datasheet.
Informations de conformité
The supplied verified excerpts do not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations for INA166UA. No compliance status has been inferred.
