ISO124U/1K - ±10V Precision Isolation Amplifier | Texas Instruments
부품 번호: ISO124U/1K ✓ 활성ISO124U/1K 개요
An isolation amplifier is a specialized interface amplifier that transfers a low-level input signal while electrically separating the input circuitry from the output circuitry. The isolation barrier prevents ground-potential differences and high-voltage events on one side of the system from corrupting measurements or damaging downstream circuitry. In the power-management hierarchy, the ISO124U/1K belongs to the isolation-amplifier and signal-conditioning IC category, where accurate voltage sensing, galvanic isolation, and compact implementation are the primary design goals.
The ISO124U/1K supports a precision isolation-amplifier configuration with fixed unity gain and bipolar operation. According to the Texas Instruments product information, maximum nonlinearity is 0.010%, signal bandwidth is 50 kHz, and input offset-voltage temperature drift is 200 µV/°C. These characteristics make the device suitable for industrial instrumentation, current-voltage sensing, power-conversion feedback, and isolated control or measurement circuits.
The device operates from dual supplies in the range of ±4.5 V to ±18 V, allowing it to interface with systems using conventional analog rails. Quiescent current is approximately ±5 mA on VS1 and ±5.5 mA on VS2. The ISO124 family is also characterized by high-voltage isolation testing and a rated isolation barrier of 1500 Vrms, although final working-voltage and safety-limit decisions must be based on the complete system requirements and manufacturer documentation.
Typical uses include isolated shunt measurement, inverter and motor-control feedback, power-supply monitoring, test and measurement equipment, and industrial communication interfaces. The 50-kHz bandwidth is sufficient for many control and sensing signals but is not intended for high-frequency waveform capture. The capacitive isolation barrier should be treated as a safety-critical component when it is part of an end-product isolation barrier.
When designing around the ISO124U/1K, provide local decoupling close to the supply pins and respect the input common-mode range. The input voltage range is limited to ±10 V, so larger process signals require attenuation or protection. Confirm the output swing, supply polarity, isolation rating, and system creepage and clearance requirements before releasing a production design. This page combines manufacturer specifications, distributor availability information, and same-footprint alternatives for engineering selection.
드롭인 대체품: ISO124U/1K — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
ISO124U
✅ 드롭인가격 문의
데이터시트 보기 →ISO124U/1KE4
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ISO124U/1KG4
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ISO124UG4
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ISO124U/1K 최대 정격 & 전기적 특성
| Product Type | Precision isolation amplifier |
| 입력 전압 범위 | ±10 V |
| Supply Voltage Range | ±4.5 V to ±18 V |
| Signal Bandwidth | 50 kHz |
| Maximum Nonlinearity | 0.010% |
| Input Offset Voltage Drift | 200 µV/°C |
| Quiescent Current on VS1 | ±5 mA |
| Quiescent Current on VS2 | ±5.5 mA |
| Isolation Voltage Rating | 1500 Vrms |
| Isolation Barrier | 2-pF differential capacitive barrier |
| Signal Transmission Method | Duty-cycle modulation-demodulation |
| Number of Channels | 1 circuit |
| 동작 온도 범위 | -25°C to +85°C |
| 패키지 | 8-pin SOIC (DVA) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
| REACH Status | Unknown |
ISO124U/1K 8-pin soic (dva) 핀 구성 가이드
ISO124U/1K(8-pin soic (dva) 패키지)의 핀 구성입니다. 이 아날로그 부품에는 입력, 출력, 전원 공급 핀이 있습니다. 오프셋 널, 보상, 인에이블 핀 구성은 제조사 데이터시트를 참조하십시오. 신호 컨디셔닝 및 증폭기 회로에 이상적입니다.
다음에 대한 상세 핀아웃 데이터 없음: ISO124U/1K.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
ISO124U/1K 적합 용도: 6 애플리케이션s: Industrial Voltage Sensing, Power-Supply Feedback, Current-Shunt Measurement, Motor-Control Isolation, Test and Measurement Equipment, Isolated Sensor Interface.
Industrial Voltage Sensing
The ISO124U/1K fits industrial voltage sensing where a bipolar measurement must be transferred across an isolation barrier. Its ±10-V input range accommodates common process-control signals, while the 0.010% maximum nonlinearity supports accurate monitoring and control-loop feedback. The device transmits the signal digitally across a 2-pF differential capacitive barrier using duty-cycle modulation and demodulation, helping prevent ground-potential errors from corrupting the measurement. With 50-kHz bandwidth, it is appropriate for relatively slow process signals rather than high-frequency waveform analysis. The fixed unity-gain architecture also simplifies system calibration and signal-chain documentation.
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Power-Supply Feedback
ISO124U/1K can be used in power-supply and converter designs that require an isolated representation of output voltage. The ±10-V sensing range allows the output to be scaled into the amplifier input domain, while 0.010% maximum nonlinearity supports the accuracy needed in control and supervision functions. Its capacitive isolation barrier separates the high-side measurement network from the controller ground, reducing common-mode coupling and ground-loop risks. The 50-kHz bandwidth is useful for loop-related voltage information, while the ±4.5-V to ±18-V supply range accommodates conventional analog rails. System designers must still verify operating voltage, transient protection, and isolation requirements.
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Current-Shunt Measurement
The ISO124U/1K is suitable for isolated shunt-current measurement when the shunt voltage is scaled to the ±10-V input range. The 200-µV/°C offset drift specification supports stable measurements across industrial temperature changes, and the 0.010% maximum nonlinearity limits amplitude error. Placing the isolation amplifier across a high-side shunt can create a galvanically separated measurement path for inverters, motor drives, and power modules. The 50-kHz bandwidth captures many control and protection signals but should be checked against the actual current transient content. Input filtering and surge protection must be designed around the maximum fault voltage seen by the sensing circuit.
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Motor-Control Isolation
ISO124U/1K can provide an isolated feedback signal in motor-control and inverter systems where the controller must remain separated from a noisy power stage. Its 50-kHz bandwidth is adequate for many current, voltage, and position-related feedback loops, while capacitive isolation reduces the need for a shared ground between the power electronics and control circuitry. The ±10-V input range covers suitably scaled sensor outputs, and bipolar supply operation supports common analog power systems. Designers should verify the isolation rating, working voltage, creepage, clearance, and external filtering against the motor-bus environment. The part should not be treated as a universal safety isolator without end-product qualification.
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Test and Measurement Equipment
ISO124U/1K is appropriate for bench and embedded measurement systems requiring a precision isolated voltage channel. Its ±10-V input range is convenient for many sensor and source signals, and its 0.010% maximum nonlinearity supports calibrated instrument performance. The fixed unity gain avoids external gain-setting components, while duty-cycle modulation across the capacitive barrier allows the measured quantity to cross an electrical isolation boundary. The 50-kHz bandwidth supports general-purpose instrumentation rather than precision low-frequency-only measurement. Because the exact pinout is not reproduced in the supplied verified results, the manufacturer datasheet should be used for the final board footprint, test-point arrangement, and decoupling layout.
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Isolated Sensor Interface
The ISO124U/1K can serve as the isolated signal-conditioning element between a remote sensor and a central controller. Its ±10-V input range accepts suitably conditioned bipolar sensor outputs, and the duty-cycle modulation-demodulation architecture transfers the measurement without a conductive signal path across the barrier. This helps isolate the sensor and its wiring from ground shifts, electrical noise, and high-potential faults. The 0.010% maximum nonlinearity preserves amplitude accuracy, while the 50-kHz bandwidth supports many temperature, pressure, and position sensors. The interface should be completed with input protection, supply decoupling, and a layout that respects the manufacturer's isolation and clearance recommendations.
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추천 제품 요약
엔지니어링 참조 데이터: ISO124U/1K — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ISO124U | ISO124U/1KE4 | ISO124U/1KG4 | ISO124UG4 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC (DVA) | 8-pin SOIC (DVA) - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Number of Channels | 1 circuit | 1 circuit | 1 circuit | 1 circuit | 1 circuit |
주요 차별점
- Direct ISO124-family replacement with matching principal specifications (vs ISO124U)
- Same 8-SOIC footprint across the documented family alternatives (vs ISO124U/1KE4)
- Precision signal-transfer performance for isolated voltage measurement (vs ISO124U/1KG4)
설계 노트
Use the Texas Instruments ISO124 datasheet as the authoritative source for the 8-pin SOIC DVA footprint, pin numbering, isolation-barrier geometry, and recommended copper keepout. Place input and output components so the isolated input network remains on the high-impedance side of the capacitive barrier. Maintain the manufacturer-recommended spacing across the barrier and avoid placing high-voltage copper, test pads, or fast-switching nodes beneath the isolation region.
The ISO124U/1K requires bipolar supplies from ±4.5 V to ±18 V. Decouple VS1 and VS2 locally and independently, since each supply domain belongs to a different side of the isolation barrier. Avoid sharing ground returns across the barrier unless the system architecture explicitly permits it. Check the output common-mode voltage against the receiving circuitry and confirm that the available supply voltage supports the required input and output operating ranges.
Do not treat the 1500-Vrms isolation rating as permission to apply that voltage continuously to every application. Determine the maximum working voltage, insulation rating, pollution degree, external-component ratings, creepage, and clearance for the finished equipment. ISO124U/1K is a precision signal-isolation amplifier, not a substitute for a dedicated reinforced safety barrier without complete application review.
The 50-kHz bandwidth makes ISO124U/1K suitable for many industrial control and measurement signals but not high-frequency waveform capture. Add input protection and filtering for surge, motor, or switching-node environments, and verify that the filter does not degrade the required settling time. Where the source impedance is high, account for input bias-current effects and use the shortest practical input trace while observing the isolation layout constraints.
규정 준수 정보
The comparison data explicitly identifies ISO124U/1K as RoHS compliant. REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals status were not confirmed for the exact ordering code in the supplied results.
