INA126PA - 36V Micropower Instrumentation Amplifier | TI
부품 번호: INA126PA ✗ 단종INA126PA 개요
An instrumentation amplifier is a specialized amplifier category used to amplify the difference between two input signals while rejecting common-mode voltage. Within the amplifier hierarchy, an instrumentation amplifier is a precision analog amplifier, while an operational amplifier is a more general-purpose building block. The INA126PA belongs to the micro-power instrumentation-amplifier family and combines differential input measurement, adjustable gain, and low bias current in one integrated circuit.
The principal advantages are low power consumption, low offset voltage, a wide operating-supply range of ±1.35 V to ±18 V, and operation from a single supply down to 2.7 V. According to the manufacturer datasheet, the device uses 175 µA per channel and provides a gain adjustment range of 1 V/V to 1000 V/V. These characteristics suit battery-powered and portable measurement systems where amplifier power can materially affect available operating time.
The INA126PA uses a two-operating-amplifier architecture for accurate, low-noise differential-signal acquisition. Its instrumentation-amplifier function is useful when the wanted signal is smaller than the voltage shared by both input nodes. The low 175 µA quiescent current is particularly important in portable instrumentation and data-acquisition systems, while the 250 µV offset specification supports precision measurement of small differential voltages.
Typical applications include portable sensor acquisition, industrial process measurement, battery-operated diagnostic equipment, low-current transducers, and differential voltage sensing. In each case, the device can condition a low-level differential input before it reaches an ADC or another signal-processing stage. Its single- and dual-supply flexibility allows it to be used with compact analog systems operating from low-voltage sources as well as higher-voltage industrial rails.
Designers should verify the exact gain-setting resistor against the manufacturer gain table and preserve the input and reference-pin arrangements shown in the datasheet. The reference input should be connected to a defined low-impedance voltage, and unused inputs must not be allowed to float. PCB layout should keep the gain-setting resistor close to the device to minimize added noise and instability in sensitive measurement circuits.
This product page consolidates verified manufacturer and distributor information, lifecycle guidance, package details, replacement analysis, and practical design guidance. It also distinguishes verified drop-in candidates from changes requiring a different package, helping engineers avoid confusing functional equivalence with literal PCB-level replaceability.
드롭인 대체품: INA126PA — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: INA126PA (동일 폼 팩터 및 풋프린트) — 차이점: Architecture, Quiescent Current, Package, Supply Voltage Range, Product Type.
INA126PAG4
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
INA126PA 최대 정격 & 전기적 특성
| Device Type | Single-channel precision instrumentation amplifier |
| Maximum Supply Voltage | 36 V |
| Supply Voltage Range | ±1.35 V to ±18 V |
| Minimum Total Supply Voltage | 2.7 V |
| 대기 전류 | 175 µA per channel |
| Input Offset Voltage | 250 µV |
| Architecture | Two-operating-amplifier instrumentation amplifier |
| Gain Range | 1 V/V to 1000 V/V |
| Small-Signal Bandwidth | 200 kHz |
| Slew Rate | 0.04 V/µs |
| Number of Amplifiers | 1 circuit |
| 패키지 | 8-pin PDIP |
| 실장 유형 | Through-hole |
INA126PA 핀 구성
| 핀 1 | RG — Gain-setting resistor connection |
| 핀 2 | IN- — Inverting input |
| 핀 3 | IN+ — Non-inverting input |
| 핀 4 | V- — Negative supply connection |
| 핀 5 | REF — Reference input |
| 핀 6 | OUT — Amplified output |
| 핀 7 | V+ — Positive supply connection |
| 핀 8 | RG — Gain-setting resistor connection |
일반적인 애플리케이션
INA126PA 적합 용도: 6 애플리케이션s: Portable Sensor Signal Conditioning, Industrial Process Measurement, Battery-Powered Diagnostic Equipment, Low-Level Transducer Acquisition, Data-Acquisition Front Ends, Precision Differential Voltage Sensing.
Portable Sensor Signal Conditioning
The INA126PA fits portable sensor acquisition because it combines differential measurement with only 175 µA of quiescent current per channel and supports a total supply as low as 2.7 V. Place the device between a differential sensor and an ADC to amplify the difference between two sensed voltages while rejecting voltage common to both inputs. Its 250 µV input offset voltage is useful when the target signal is small, and the adjustable gain range of 1 V/V to 1000 V/V allows the analog front end to match the available sensor span. The main design benefit is lower amplifier power consumption than a conventional high-current instrumentation amplifier; the tradeoff is that the target is obsolete and new portable products should verify long-term sourcing.
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Industrial Process Measurement
The INA126PA is applicable to industrial process measurement when the measured quantity is represented as a small differential voltage. Its 36 V maximum supply rating and ±1.35 V to ±18 V operating range provide useful supply flexibility for industrial analog circuits, while the two-operating-amplifier architecture supports low-noise differential acquisition. The 200 kHz bandwidth is adequate for many slowly varying process signals, and the gain can be adjusted from 1 V/V to 1000 V/V to improve use of the ADC input range. Engineers should account for the obsolete lifecycle status, confirm the operating-temperature requirement, and ensure the reference input is driven by a stable low-impedance source.
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Battery-Powered Diagnostic Equipment
The INA126PA supports battery-powered diagnostic equipment because its 175 µA-per-channel quiescent current reduces the continuous load associated with analog amplification. The device can operate from a 2.7 V total supply and accepts dual supplies from ±1.35 V to ±18 V, allowing it to fit different portable power architectures. A 250 µV input offset specification supports measurement of small differential signals, and programmable gain can amplify a weak transducer output before digitization. The engineering trade-off is that low offset and gain accuracy must be checked against battery drift, sensor excitation requirements, and the error contribution of the external gain resistor.
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Low-Level Transducer Acquisition
The INA126PA is suited to acquiring low-level differential outputs from resistive, strain, pressure, and similar transducers when supply power must remain modest. Differential amplification suppresses common-mode voltage that could otherwise consume the input range, while the selectable gain of 1 V/V to 1000 V/V allows the circuit to amplify a weak millivolt-level signal ahead of an ADC. Its 250 µV offset voltage establishes an important error floor that must be included in the measurement budget. Designers should follow the datasheet gain table, place the gain-setting resistor close to the device, and verify that excitation drift and sensor noise remain acceptable.
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Data-Acquisition Front Ends
The INA126PA can form the analog input stage of a compact data-acquisition system by converting a differential sensor signal into a single-ended voltage suitable for an ADC. Its 200 kHz small-signal bandwidth supports signal rates well beyond many slow environmental and industrial measurements, while the 36 V maximum supply offers headroom for higher-voltage systems. The tradeoff is that the 175 µA quiescent current should be included in a continuous-power budget, and an external ADC may require an input range that changes the optimum gain. The reference and gain pins should be configured directly from the manufacturer guidance rather than treated as general-purpose op-amp inputs.
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Precision Differential Voltage Sensing
The INA126PA is appropriate for precision differential voltage sensing when the required signal is smaller than the common-mode voltage present at both inputs. Its low 250 µV offset and adjustable gain help preserve measurement resolution, while differential operation reduces the influence of shared supply or ground disturbances. The device can be operated from a 2.7 V total supply in compact systems or from higher dual rails in industrial equipment. Engineering checks should include the complete error chain, source impedance balance, reference stability, gain-resistor tolerance, and whether the obsolete lifecycle status is acceptable for the intended production program.
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추천 제품 요약
엔지니어링 참조 데이터: INA126PA — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | INA126PAG4 |
|---|---|---|
| Package | 8-pin PDIP | 8-pin PDIP - same package |
| Brand | Texas Instruments | Texas Instruments |
| Device Type | Single-channel instrumentation amplifier | Single-channel INA126-family instrumentation amplifier |
주요 차별점
- Established 8-pin PDIP footprint (vs INA126UA/2K5)
- Low-power differential acquisition (vs INA126PAG4)
- Wide supply capability (vs INA126PAG4)
설계 노트
Do not treat the Texas Instruments-recommended INA126UA/2K5 as a literal PCB drop-in for INA126PA without comparing package drawings. INA126PA is specified in an 8-pin PDIP package, while the UA ordering code denotes a different physical option. Even when the electrical functions match, a new PCB or careful lead-forming and pin-mapping review is required. Confirm the gain formula, reference connection, supply pins, and exposed functional differences against the manufacturer documentation.
Place the gain-setting resistor close to the INA126PA gain terminal to minimize parasitic resistance, capacitive pickup, and sensitivity to induced noise. Keep the input and reference routing short and use a low-impedance reference source. The two-operating-amplifier architecture is intended for accurate differential acquisition, but incorrect grounding, unbalanced source impedances, or an unstable reference can degrade performance more than the nominal 250 µV offset specification would suggest.
Budget the continuous INA126PA supply consumption using the verified 175 µA-per-channel quiescent current and the actual total supply voltage. Additional current comes from the signal source, gain-setting network, reference circuitry, and downstream conversion stages. Although the device can operate from a 2.7 V total supply, the minimum voltage, usable output swing, gain, and source impedance must be checked together rather than treating the minimum supply rating as a guarantee of full-scale output.
Resolve the obsolete lifecycle status before committing a new design. Existing assemblies may be supported by distributor stock, but that does not provide a manufacturer production commitment. For repairs, compare the complete ordering codes, package drawings, temperature requirements, gain settings, and device markings. For new designs, obtain a current manufacturer recommendation or equivalent with verified lifecycle status instead of assuming that distributor availability makes the target suitable for long-term production.
규정 준수 정보
The supplied manufacturer and distributor snippets do not provide explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is not applicable because the verified data does not identify an automotive-qualified variant.