INA141UA - G=10/100 Instrumentation Amplifier | TI
MPN: INA141UA ✓ सक्रियINA141UA अवलोकन
An instrumentation amplifier is a specialized amplifier that amplifies the voltage difference between two inputs while rejecting signals common to both inputs. The INA141 belongs to the amplifier hierarchy as an instrumentation amplifier, differential amplifier, and analog signal-conditioning IC. Its three-op-amp architecture provides accurate gain, high common-mode rejection, and balanced input impedance, making it useful for sensors whose outputs sit on a large common-mode voltage.
The INA141 uses a versatile three-op-amp design and current-feedback input circuitry. This architecture maintains 200 kHz bandwidth even at the higher gain of 100 V/V. The available gain settings are implemented through simple pin connections without external gain-setting resistors, reducing component count and avoiding the tolerance and temperature errors introduced by a conventional external resistor network. Its low 5 nA maximum input bias current is particularly useful for high-impedance sources.
The device is designed for precision measurement of low-level differential signals rather than for driving heavy loads. Its maximum offset voltage of 50 µV and drift of 0.5 µV/°C help maintain accuracy as temperature changes, while 117 dB minimum common-mode rejection suppresses common-mode noise and supply-related disturbances. The listed wide supply range of ±18 V accommodates dual-supply instrumentation systems, although operating-limit details should be confirmed in the manufacturer datasheet for a specific design.
Typical applications include bridge-transducer signal conditioning, strain-gauge and pressure-sensor amplification, current-shunt measurement, isolated or high-voltage sensor interfaces, laboratory instrumentation, and precision industrial control systems. Input protection to ±40 V is useful when the sensor input can exceed the normal operating range, but system-level protection, grounding, and common-mode limits still require careful review.
The principal design consideration is common-mode range. A high common-mode rejection ratio does not permit the input common-mode voltage to exceed the amplifier's linear input range. Designers should also place input and reference components for low noise, avoid long sensitive traces, and preserve the specified gain connections. Decoupling capacitors should be positioned close to the supply pins according to the manufacturer's layout guidance.
This page combines verified manufacturer and distributor information with application guidance, drop-in candidate comparisons, and design checks. It also distinguishes verified INA141UA parameters from data that must be confirmed in the manufacturer datasheet, helping engineers select and implement the amplifier without relying on unverified substitute specifications.
के लिए ड्रॉप-इन विकल्प INA141UA — समान पैकेज, पिन-टू-पिन संगत। PCB रीवर्क आवश्यक करने वाले भिन्न-पैकेज पार्ट्स शामिल नहीं हैं।
इस सीरीज़ के वेरिएंट
समान श्रृंखला के मॉडल जो ड्रॉप-इन संगत हैं INA141UA (समान फॉर्म फैक्टर और फुटप्रिंट) — इसमें भिन्न Bandwidth, Product Type, Package, Architecture, Gain.
INA143U
✅ ड्रॉप-इनकीमत के लिए संपर्क करें
डेटाशीट देखें →INA146UA
✅ ड्रॉप-इनकीमत के लिए संपर्क करें
डेटाशीट देखें →INA157U
✅ ड्रॉप-इनकीमत के लिए संपर्क करें
डेटाशीट देखें →INA141UA Maximum Ratings और Electrical Characteristics
| Amplifier Type | Instrumentation amplifier |
| Architecture | Three-op-amp design |
| Number of Circuits | 1 circuit |
| Selectable Gain | 10 V/V or 100 V/V |
| Bandwidth at G=100 | 200 kHz |
| Maximum Input Offset Voltage | 50 µV |
| Maximum Input Offset Drift | 0.5 µV/°C |
| Maximum Input Bias Current | 5 nA |
| Minimum Common-Mode Rejection | 117 dB |
| Maximum Protected Input Voltage | ±40 V |
| Supply Voltage Range | ±18 V |
| Temperature Grade | Industrial |
| पैकेज | 8-pin SOIC |
| माउंटिंग प्रकार | Surface mount |
| Terminal Count | 8 terminals |
INA141UA पिन कॉन्फ़िगरेशन
| पिन 1 | RG — Gain-setting connection for gain configuration |
| पिन 2 | RF — Feedback gain-setting connection |
| पिन 3 | V- — Negative supply connection |
| पिन 4 | -IN — Inverting input |
| पिन 5 | +IN — Non-inverting input |
| पिन 6 | V+ — Positive supply connection |
| पिन 7 | OUT — Amplified output |
| पिन 8 | RG — Gain-setting connection for gain configuration |
सामान्य अनुप्रयोग
INA141UA के लिए उपयुक्त है 6 अनुप्रयोगs: Strain-Gauge and Bridge Transducer Amplification, Precision Current-Shunt Measurement, Laboratory and Instrumentation Signal Conditioning, Pressure and Resistance Sensor Interfaces, Industrial Process-Control Measurement, High-Common-Mode Sensor Interface.
Strain-Gauge and Bridge Transducer Amplification
The INA141UA fits bridge-sensor front ends that produce small differential voltages over a substantial common-mode voltage. Its 50 µV maximum offset voltage and 0.5 µV/°C maximum drift reduce errors relative to the bridge output, while 117 dB minimum common-mode rejection suppresses common-mode excitation and supply noise. The fixed gains of 10 V/V and 100 V/V simplify conditioning without an external resistor network. The designer must still verify that the bridge excitation and input common-mode voltage stay within the amplifier’s linear operating range, and that input protection up to ±40 V is appropriate for the intended fault conditions.
अनुशंसित
Precision Current-Shunt Measurement
The INA141UA is suitable for measuring the small voltage generated across a current shunt when the shunt voltage is superimposed on a large common-mode potential. Its 5 nA maximum input bias current limits the disturbance introduced into high-impedance sensing paths, while 117 dB minimum common-mode rejection improves rejection of supply and system noise. A gain of 10 V/V or 100 V/V can scale the shunt signal toward an ADC input range. Before deployment, check the common-mode voltage, output swing, shunt impedance, and amplifier recovery behavior following a large overcurrent event.
अनुशंसित
Laboratory and Instrumentation Signal Conditioning
The INA141UA can condition low-level differential signals in laboratory and test equipment where a readable output is required without excessive noise or dc offset. The three-op-amp architecture supports accurate differential amplification, and the 200 kHz bandwidth at a gain of 100 accommodates signals beyond precision dc-only measurements. Simple gain selection reduces external components and calibration complexity compared with a discrete amplifier network. Designers should preserve short, symmetric input routes, use a stable reference connection where required, and avoid assuming that common-mode rejection remains constant outside the manufacturer’s stated test conditions.
अनुशंसित
Pressure and Resistance Sensor Interfaces
The INA141UA is appropriate for resistive pressure, position, and resistance sensors when the desired output is a low-level differential signal. Maximum input offset voltage of 50 µV and maximum drift of 0.5 µV/°C support stable measurement as temperature changes, while the selectable gains provide headroom between sensor sensitivity and downstream converter resolution. The 5 nA maximum input bias current is beneficial when sensor resistance is high. System-level accuracy must also account for excitation drift, sensor nonlinearity, reference quality, and the allowable common-mode range of the amplifier.
अनुशंसित
Industrial Process-Control Measurement
The INA141UA can amplify differential process-sensor signals in industrial control equipment where common-mode noise and offset errors affect control accuracy. Its 117 dB minimum common-mode rejection is valuable when the measurement is referenced to a noisy industrial ground, and the 10 V/V or 100 V/V gains simplify scaling to an analog-to-digital converter. The wide stated supply capability of ±18 V supports dual-rail instrumentation architectures. The PCB should keep sensitive inputs away from switching nodes and power inductors, while surge protection must be designed around the amplifier’s input limits and application fault conditions.
अनुशंसित
High-Common-Mode Sensor Interface
The INA141UA is useful when a sensor output must be measured above a changing common-mode voltage and cannot be referenced directly to ground. The three-op-amp instrumentation-amplifier topology provides differential gain while maintaining high common-mode rejection, and current-feedback input circuitry preserves 200 kHz bandwidth at gain 100. This combination is valuable for compact sensor modules and industrial interface boards. The design must verify the complete common-mode range, output-voltage headroom, supply sequencing, and whether the ±40 V protected-input specification represents an operating limit or only a survivability feature.
अनुशंसित
अनुशंसित उत्पादों का सारांश
के लिए इंजीनियरिंग संदर्भ डेटा INA141UA — तुलना, डिज़ाइन मार्गदर्शन और अनुपालन जानकारी।
चयन गाइड
विकल्पों के साथ तुलना
| पैरामीटर | यह उत्पाद | INA143U | INA146UA | INA157U |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 |
| Amplifier Type | Instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier |
मुख्य विशेषताएँ
- Two direct gain selections simplify bridge-sensor conditioning (बनामINA143U)
- Documented 200 kHz bandwidth at the higher gain (बनामINA146UA)
- Low offset and drift support precision differential measurement (बनामINA157U)
- Defined protected-input capability (बनामINA146UA)
डिज़ाइन नोट्स
Route the two input signals as short and symmetrically as practical, and keep them away from switching nodes, high-current return paths, and inductor fields. Place the input, feedback, gain-setting, and bypass components close to their associated pins. Because the INA141 uses current-feedback input circuitry, maintaining the manufacturer’s recommended connection and component-placement arrangement is important for predictable bandwidth, offset, and stability.
Decouple each supply rail close to the corresponding INA141UA pin and confirm capacitor voltage ratings against the actual rail voltage and expected transient peaks. The supplied data states a wide supply range extending to ±18 V but does not provide complete operating or absolute-maximum limits. Do not infer safe limits from the protected-input rating of ±40 V; use the official manufacturer datasheet for supply, input, output, and power limits.
Do not confuse high common-mode rejection with unlimited common-mode input range. The amplifier may reject common-mode noise well, but the input pair must remain within its linear common-mode range to avoid saturation or recovery problems. Likewise, ±40 V is presented as input protection, not as permission to operate continuously at ±40 V. Verify sensor excitation, fault voltages, output swing, and supply sequencing before energizing the circuit.
The three-op-amp topology provides useful rejection of common-mode noise but can amplify differential noise and offsets as well as the intended signal. Use short input traces, suitable grounding, clean excitation sources, and stable gain or reference connections. When a sensor output contains high-frequency content, evaluate the 200 kHz bandwidth at gain 100 together with settling requirements rather than treating bandwidth alone as a complete accuracy specification.
अनुपालन जानकारी
The verified excerpts identify RoHS and REACH as comparison attributes but do not state their compliance status. The INA141UA is an industrial-grade instrumentation amplifier, not an explicitly AEC-Q100-qualified automotive device in the supplied data.