INA125P - Precision Bridge Amplifier with 10V Reference | Texas Instruments
Référence : INA125P ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $7.852 | $7,85 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1 000 | $0 | $0,00 |
INA125P Présentation
An instrumentation amplifier is a precision analog amplifier optimized for measuring small differential signals while rejecting large common-mode voltages. In the signal-chain hierarchy, the INA125P belongs to the instrumentation-amplifier class, then analog signal-conditioning amplifiers, then amplifiers and integrated analog ICs. Its internal three-op-amp-style signal conditioning is particularly useful for resistive sensors whose outputs are small, differential, and referenced to a bridge supply.
Key features include a low 460 µA typical quiescent current, a 10 V precision reference, sleep-mode shutdown, low input bias current, and an industrial temperature range of -40°C to +85°C. The integrated reference can excite a bridge directly, while the differential amplifier rejects common-mode voltage present on both sensor inputs. Sleep mode supports duty-cycle operation and can reduce supply demand when measurements are not continuously required.
The verified distributor data identifies a 2.7 V to 36 V supply capability, while another distributor result describes operation from 1.35 V to ±18 V. The manufacturer describes the device as usable in single-supply or dual-supply arrangements, subject to the detailed datasheet limits. The 150 kHz bandwidth and 0.02 V/µs slew rate support low-to-moderate-frequency measurements where fast settling is less important than low offset and low power.
Typical uses include load-cell signal conditioning, strain-gauge bridge measurements, pressure-transducer interfaces, industrial weighing systems, and portable sensor instrumentation. The internal 10 V reference is particularly valuable when the sensing bridge needs excitation and a compact analog front end is preferred.
When designing around the INA125P, check the selected gain, reference configuration, supply voltage, input common-mode range, and output swing against the manufacturer datasheet. Decoupling capacitors should be placed close to the supply pins, and the sensor return should be connected with care to preserve differential accuracy. The 16-pin DIP package is through-hole and is not mechanically interchangeable with the SO-16 variant.
This page consolidates verified manufacturer and distributor information, package distinctions, application guidance, pricing context, and replacement-search results. It distinguishes confirmed drop-in evidence from unavailable alternatives rather than presenting unverified substitutions.
Alternatives de remplacement direct pour INA125P — 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 INA125P (même facteur de forme et même empreinte) — différant par Mounting Type, Package, Quiescent Current, Sleep Mode.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesINA125P Valeurs maximales et caractéristiques électriques
| Product Type | Instrumentation amplifier with precision voltage reference |
| Number of Circuits | 1 circuit |
| Maximum Input Offset Voltage | 250 µV |
| Maximum Input Offset Drift | 2 µV/°C |
| Slew Rate | 0.02 V/µs |
| Bandwidth | 150 kHz |
| Tension d'alimentation | 2.7 V to 36 V |
| Courant de repos | 460 µA typical |
| Precision Voltage Reference | 10 V |
| Température de fonctionnement | -40°C to +85°C |
| Boîtier | 16-pin plastic DIP, through-hole |
| Type de montage | Through-hole |
| Temperature Grade | Industrial |
| Sleep Mode | Supported |
Configuration des broches de INA125P
| Broche 1 | [DATA_NEEDED: pin 1 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 2 | [DATA_NEEDED: pin 2 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 3 | [DATA_NEEDED: pin 3 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 4 | [DATA_NEEDED: pin 4 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 5 | [DATA_NEEDED: pin 5 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 6 | [DATA_NEEDED: pin 6 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 7 | [DATA_NEEDED: pin 7 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 8 | [DATA_NEEDED: pin 8 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 9 | [DATA_NEEDED: pin 9 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 10 | [DATA_NEEDED: pin 10 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 11 | [DATA_NEEDED: pin 11 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 12 | [DATA_NEEDED: pin 12 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 13 | [DATA_NEEDED: pin 13 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 14 | [DATA_NEEDED: pin 14 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 15 | [DATA_NEEDED: pin 15 name] — Verify against the official Texas Instruments INA125 datasheet. |
| Broche 16 | [DATA_NEEDED: pin 16 name] — Verify against the official Texas Instruments INA125 datasheet. |
Applications typiques
INA125P convient pour 6 applications: Load-Cell Signal Conditioning, Strain-Gauge Bridge Measurement, Pressure-Transducer Interface, Portable Weighing Systems, Industrial Sensor Instrumentation, Precision Bridge Reference Circuits.
Load-Cell Signal Conditioning
The INA125P fits load-cell front ends because its built-in 10 V reference can support bridge excitation while its differential amplifier processes the small millivolt-level sensor output. The verified 250 µV maximum input offset is useful when the load-cell signal is small, and the instrumentation-amplifier topology helps reject common-mode voltage present equally on both bridge nodes. The circuit should be checked against the load-cell resistance, excitation current, input common-mode range, and required output range. The 150 kHz bandwidth is appropriate for static weighing and slower force measurements, while sleep mode can reduce power between measurements.
Recommandé
Strain-Gauge Bridge Measurement
For strain-gauge bridges, the INA125P combines a precision reference with differential input amplification, reducing the number of separate analog blocks required for excitation and readout. The 10 V reference is useful for bridges specified around that excitation level, while the 250 µV offset specification helps preserve measurement accuracy when strain-gauge outputs are small. Engineers should verify bridge sensitivity, input common-mode voltage, gain setting, reference noise, and output headroom in the manufacturer datasheet. The device is best suited to low-frequency mechanical measurements where bandwidth and settling requirements are moderate.
Recommandé
Pressure-Transducer Interface
The INA125P is appropriate for bridge-based pressure transducers because the differential measurement path can reject supply or ground variation shared by both sensor inputs, while the integrated 10 V reference supplies a defined excitation voltage. Its 460 µA typical quiescent current supports low-power instrumentation, and sleep mode allows a duty-cycled measurement architecture. The transducer's sensitivity, bridge impedance, allowable excitation voltage, and output range must be matched to the selected gain and supply arrangement. Designers should also account for cable noise, input filtering, reference decoupling, and the device's stated operating temperature range of -40°C to +85°C.
Recommandé
Portable Weighing Systems
Battery-powered scales and portable weighing instruments can use the INA125P to combine bridge excitation and analog signal conditioning in one package. The low 460 µA typical quiescent current is helpful when energy consumption matters, and sleep mode supports intermittent measurements. The 16-pin plastic DIP package is appropriate for through-hole prototypes and assemblies where a larger package is acceptable. Before selecting it, confirm the load-cell excitation requirements, analog output range, ADC interface, mechanical noise environment, and whether the required temperature grade and supply arrangement meet the product specification.
Recommandé
Industrial Sensor Instrumentation
The INA125P is useful in industrial sensor instrumentation that measures small differential signals from resistive bridges while operating from a relatively constrained power budget. Its precision reference provides a defined excitation reference, and the differential input architecture helps manage common-mode voltage in cable-connected or grounded systems. The 150 kHz bandwidth is suitable for many process and machine-monitoring signals but not for high-speed vibration analysis. Industrial designs should provide local supply bypassing, protect inputs from surge and ESD events, verify reference stability, and check the operating temperature range against the enclosure environment.
Recommandé
Precision Bridge Reference Circuits
The INA125P can serve as a compact bridge-reference and differential-measurement block when a system needs excitation and signal amplification without separate reference and instrumentation-amplifier ICs. The 10 V internal reference is the defining feature for this use, while the 250 µV maximum offset supports accurate sensing of small bridge differentials. The reference output and amplifier gain must be configured according to the manufacturer datasheet, and the circuit must remain within the allowed supply, common-mode, and output-swing limits. This use is particularly relevant to laboratory instruments, calibration fixtures, and compact industrial measurement modules.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour INA125P — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit |
|---|---|
| Product Type | Instrumentation amplifier with precision voltage reference |
| Package | 16-pin plastic DIP |
| Brand | Texas Instruments |
| Maximum Input Offset Voltage | 250 µV |
| Maximum Input Offset Drift | 2 µV/°C |
| Slew Rate | 0.02 V/µs |
| Bandwidth | 150 kHz |
| Precision Voltage Reference | 10 V |
| Quiescent Current | 460 µA typical |
| Supply Voltage | 2.7 V to 36 V |
| Operating Temperature | -40°C to +85°C |
| Sleep Mode | Supported |
Principaux différenciateurs
- Integrated precision reference (vs INA125U)
- Through-hole integration (vs INA125U)
- Low-offset bridge measurement (vs AD623ANZ)
Notes de conception
Use the verified 460 µA typical quiescent-current figure only as a starting point for power budgeting. Actual current depends on supply voltage, gain configuration, reference state, output load, and sleep-mode control. Place the supply bypass capacitors close to the INA125P power pins and keep the reference and analog return paths compact. Verify the selected supply arrangement against the datasheet before using the 2.7 V to 36 V distributor range as an unconditional operating guarantee.
Route the two bridge inputs as a matched differential pair and keep them away from switching nodes and high-current return paths. Connect the sensor return and reference ground deliberately so small differential signals are not contaminated by ground gradients. Because the device uses a 16-pin plastic DIP, provide adequate through-hole spacing and inspect the solder joints for bridges around fine-pitch pins. Use the manufacturer application guidance for gain-resistor placement and reference configuration.
Do not select the INA125 solely by its 10 V reference output. First verify bridge excitation voltage, input common-mode range, supply voltage, gain, output swing, and required bandwidth. The 150 kHz bandwidth is adequate for many static sensor systems but may be insufficient for faster dynamic measurements. Also confirm whether the mechanical design requires the INA125P DIP package rather than the SO-16 INA125U variant, since the packages are not drop-in replacements.
Informations de conformité
The supplied verified data identifies an industrial temperature range but does not provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is not applicable based on the available information because automotive qualification is not stated.
