ISO120G - Precision Isolation Amplifier | Texas Instruments
MPN： ISO120G ✗ 停產ISO120G 概覽
An isolation amplifier is an analog signal-conditioning component that transfers a voltage or current measurement across an electrically isolated barrier. It belongs to the instrumentation-amplifier and isolation-interface hierarchy, with isolation providing protection against high common-mode voltage, ground-potential differences, and hazardous electrical environments. The ISO120 family is intended for industrial control, data acquisition, power-system monitoring, and test equipment where accurate measurement must remain separated from the protected circuitry.
The ISO120G is described as a precision, low-cost isolation amplifier with low nonlinearity, bipolar operation, and user control of carrier frequency. The verified material specifically identifies ±0.01% maximum nonlinearity and 150 µV/°C maximum offset-voltage drift under the stated 6 kHz bandwidth condition. It also describes 100% partial-discharge testing for ISO120 and a 1500 Vrms isolation rating. These features make the device relevant to systems requiring signal fidelity as well as galvanic isolation.
The ISO120 family uses isolation between the input and output sides while preserving a scaled representation of the input signal. Its precision characteristics are useful for current-shunt measurement, transducer interfaces, power-conversion feedback, and industrial instrumentation. The listed 60 kHz bandwidth capability supports applications that require a faster response than a slow precision-only measurement path, while the 6 kHz capacitor-assisted specification provides an alternative when maximum linearity and drift are priorities.
Typical implementation involves connecting the isolated input signal, supplying power on both sides of the barrier, and routing the differential output to an ADC or analog processing circuit. Layout must preserve the isolation barrier, maintain adequate creepage and clearance, and provide the required bypassing. The component should not be replaced solely because another isolation amplifier performs a similar function; package geometry, pinout, supply range, isolation rating, bandwidth, and input range must all be verified.
This page consolidates verified manufacturer and distributor information while identifying unresolved package and ordering details transparently. It also explains the isolation-amplifier category, practical design considerations, and the distinction between documented product data and information that still needs manufacturer confirmation.
直接替換替代品，適用於 ISO120G — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ISO120G （相同外形與佔位） — 差異在於 Package, Carrier Frequency, Product Type, Isolation Voltage Rating, Nonlinearity.
ISO120
✅ 直接替換📋 參考替代品（不在目錄中）
ISO121
✅ 直接替換📋 參考替代品（不在目錄中）
ISO120G 最大額定值與電氣特性
| Product Type | Precision low-cost isolation amplifier |
| Isolation Voltage Rating | 1500 Vrms |
| Input Range | 50 mV |
| Supply Voltage Range | ±4.5 V to ±18 V |
| Bandwidth | 60 kHz |
| Nonlinearity | ±0.01% maximum |
| Offset Voltage Drift | 150 µV/°C maximum at 6 kHz bandwidth with two external capacitors |
| Partial Discharge Testing | 100% tested for partial discharge for ISO120 |
| Carrier Frequency | User controlled |
| Bipolar Operation | Supported |
| Amplifier Count | 1 circuit |
| 封裝 | 16-CDIP according to the DigiKey product result; related family listing also states 24-pin hermetic DIP |
| Lead Count | 16 leads according to the DigiKey product result |
| Isolation Class | Galvanic isolation amplifier |
| Input Type | Bipolar analog input measurement |
| 輸出類型 | Differential isolation amplifier output |
| Manufacturer Product Family | ISO120 precision low-cost isolation amplifier |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | unknown |
ISO120G 16-cdip according to the digikey product result; related family listing also states 24-pin hermetic dip 腳位配置指南
ISO120G（16-cdip according to the digikey product result; related family listing also states 24-pin hermetic dip 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： ISO120G.
請參閱 資料表 以查看完整腳位配置。
典型應用
ISO120G 適用於 6 應用s: Industrial current-shunt measurement, Power-conversion feedback isolation, High-side transducer interface, Medical-equipment signal isolation, Test and measurement instrumentation, Power-system monitoring.
Industrial current-shunt measurement
The ISO120G fits industrial current measurement when a shunt or sensor produces a small bipolar signal that must be transferred across an isolation barrier. Its documented 50 mV input range and precision low-cost isolation-amplifier positioning are appropriate for conditioning a differential measurement before an ADC or controller. The 1500 Vrms ISO120 isolation rating can help separate the measured power domain from the control domain, but the circuit must preserve the required input common-mode range and use the manufacturer-recommended isolation layout. The 60 kHz capability is useful for faster transients, while the capacitor-assisted 6 kHz configuration prioritizes guaranteed nonlinearity and offset drift.
推薦
Power-conversion feedback isolation
ISO120G is relevant to power-conversion systems where a control circuit must observe a feedback signal across a high-side or high-voltage barrier. Its bipolar operation allows the measurement path to handle signals around ground, while the 1500 Vrms isolation rating provides the stated barrier capability. The amplifier should sit between the power-stage sensing node and the controller ADC or comparator, with the input network scaled to the available shunt or divider range. Designers must confirm supply polarity, isolation working voltage, capacitor selection, and whether 60 kHz response or the reduced 6 kHz precision configuration better matches the converter control loop.
推薦
High-side transducer interface
The ISO120G can isolate a bipolar transducer or sensor output before it reaches a data-acquisition system. Its precision isolation architecture is useful when the transducer is referenced to a noisy or potentially hazardous ground and the downstream electronics need a clean differential signal. The 50 mV input range means the source may require amplification or attenuation before the isolation amplifier, and that conditioning stage must be checked for common-mode limits. The 60 kHz bandwidth supports moderately fast process signals, whereas the 6 kHz precision configuration can be preferable when ±0.01% maximum nonlinearity and 150 µV/°C maximum drift are the priorities.
推薦
Medical-equipment signal isolation
ISO120G can be evaluated for medical-equipment signal paths where an analog measurement must be separated from patient-connected or externally accessible circuitry. The isolation barrier and precision low-cost isolation-amplifier description provide the core electrical function, but the retrieved data does not establish medical certification, patient-isolation rating, leakage-current limits, or AEC-Q100 status. Therefore, the component should not be assumed compliant without a complete safety and qualification review. A design would need application-specific input protection, barrier construction, creepage and clearance validation, leakage testing, and confirmation that the completed equipment meets its intended standard.
推薦
Test and measurement instrumentation
ISO120G is suitable for test equipment that measures low-level differential signals while keeping the instrument electronics isolated from the source under test. The 50 mV range supports sensitive measurements after appropriate scaling, and the precision characterization is useful when the instrument needs repeatable gain and low nonlinearity. The 60 kHz option can address faster test signals, while the capacitor-assisted 6 kHz mode gives a documented accuracy-oriented alternative. The final design must account for input-referred noise, offset drift, calibration, isolation capacitance, test-fixture creepage, and the grounding strategy of the instrument chassis.
推薦
Power-system monitoring
ISO120G can be used in power-system monitoring to transfer a scaled voltage, current, or feedback signal from a high-voltage domain into a controller or logger. The stated 1500 Vrms isolation rating supports designs where the measurement node must remain electrically separated from low-voltage electronics. The device is especially useful when the monitored signal is bipolar and the downstream system needs better than a simple differential front end with no isolation. Engineers should verify the exact working-voltage requirements, input protection, divider or shunt design, surge environment, and whether the available ISO120G package and lifecycle status suit the production program.
推薦
推薦產品摘要
工程參考資料，適用於 ISO120G — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ISO120 | ISO121 |
|---|---|---|---|
| Product Type | Precision low-cost isolation amplifier | Precision low-cost isolation amplifier | Precision low-cost isolation amplifier family |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Isolation Voltage | 1500 Vrms | 1500 Vrms associated with ISO120 family | 3500 Vrms |
主要差異化特點
- Precision isolation-amplifier positioning (對比ISO120)
- Isolation rating (對比ISO121)
- Precision configuration flexibility (對比ISO120)
設計說明
Maintain the isolation barrier as a continuous physical separation between input-side and output-side copper, components, and ground networks. Verify the exact ISO120G package and lead numbering from the manufacturer datasheet before routing because the retrieved distributor material describes conflicting 16-CDIP and 24-pin hermetic-DIP configurations. Route the input and output returns separately, avoid copper planes spanning the barrier, and place protection components on the side where the transient energy originates.
Choose between the 60 kHz configuration and the capacitor-assisted 6 kHz configuration according to the measurement objective. The 60 kHz mode avoids the documented external components, while the 6 kHz mode is associated with ±0.01% maximum nonlinearity and 150 µV/°C maximum offset drift. Check input-referred noise, source impedance, settling time, ADC acquisition window, and the bandwidth required by the isolated signal rather than selecting bandwidth solely from the headline frequency.
Provide independent bypassing and regulated bipolar supplies on both sides of the isolation barrier. The verified supply range is ±4.5 V to ±18 V, so the design must remain within the confirmed absolute maximum and operating limits of the exact ordering code. Keep switching regulators and high-current return paths away from the analog input and isolation amplifier, and validate power-up, power-down, and rail-sequencing behavior before production release.
Do not treat ISO120, ISO120G, ISO120BG, or ISO121 as interchangeable merely because related product pages list them together. Confirm lead assignments, package dimensions, isolation rating, input range, supply requirements, temperature grade, and lifecycle status. A functional isolation amplifier with a different package is not a drop-in replacement, and a claimed substitute must be validated by the manufacturer or by a documented pin and parameter cross-reference.
合規資訊
The verified data does not provide compliance declarations for ISO120G. The Texas Instruments support discussion snippet states that ISO120G was listed as Not Recommended for New Designs, but the supplied product snippets do not independently confirm that status for every package or ordering code. Current manufacturer documentation should be reviewed before production use.
