ISO120SG - Precision Isolation Amplifier | Texas Instruments
MPN： ISO120SG ✗ 停產ISO120SG 概覽
An isolation amplifier is an instrumentation-amplifier derivative that transfers a differential input signal across a galvanic-isolation barrier while preventing conductive current between the input and output domains. The ISO120 family uses duty-cycle modulation and demodulation to encode the analog input as a carrier signal, cross the capacitive barrier, and recover it at the output. This architecture makes the device suitable for measuring low-level signals in electrically noisy or hazardous environments where a common ground cannot be shared.
According to the supplied manufacturer and distributor references, the ISO120SG is a one-circuit isolation amplifier with 60 kHz signal bandwidth, bipolar operation, low nonlinearity, and user control of carrier frequency. The ISO120 family is also described as 100% tested for partial discharge and rated for 1500 Vrms isolation; these claims should be checked against the applicable ISO120 datasheet before using the part in a safety-critical design. The family supports operation without external components for 60 kHz bandwidth, while two external capacitors can enable precision specifications at reduced bandwidth.
Typical uses include industrial process-control channels, isolated sensor interfaces, medical monitoring equipment, power-conversion feedback, data-acquisition systems, and galvanically isolated communications. The isolation barrier allows a field-side input circuit and output-side signal chain to use separate ground domains, reducing common-mode current paths and protecting sensitive equipment from ground-potential differences.
The key design issue is package verification. DigiKey describes ISO120SG as a 16-CDIP part, while Heisener describes a 24-CDIP package with 16 leads. Do not select a footprint or publish a complete pinout until the exact ordering suffix and mechanical drawing are confirmed. Also verify whether the required isolation rating, creepage, clearance, and barrier construction fit the final safety standard.
This page consolidates the verified manufacturer identification, distributor descriptions, sourcing references, and application guidance while marking unresolved package and detailed electrical values rather than guessing them.
直接替換替代品，適用於 ISO120SG — 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： ISO120SG （相同外形與佔位） — 差異在於 Package, Product Type, Carrier Frequency, Nonlinearity, Isolation Voltage Rating.
ISO120G
✅ 直接替換聯絡詢價
查看資料表 →ISO120BG
✅ 直接替換聯絡詢價
查看資料表 →ISO120SG 最大額定值與電氣特性
| Product Type | Precision low-cost isolation amplifier |
| Isolation Architecture | Duty-cycle modulation and demodulation across a 2 pF differential capacitive barrier |
| Signal Bandwidth | 60 kHz |
| Isolation Voltage Rating | 1500 Vrms |
| Nonlinearity | ±0.01% maximum at the precision operating condition |
| Input Offset Voltage Drift | 150 µV/°C maximum with the specified external-capacitor and reduced-bandwidth condition |
| Common-Mode Rejection | High IMR at 60 Hz |
| Carrier Frequency | User controlled |
| Supply Operation | Bipolar operation |
| Number of Circuits | 1 isolation amplifier per package |
| Package Information | 16-CDIP according to the DigiKey listing; 24-CDIP with 16 leads according to the Heisener listing |
| Package Family | Ceramic dual in-line package (CDIP) |
| Partial Discharge Qualification | 100% tested for partial discharge |
| External Components | None required for 60 kHz bandwidth; two external capacitors used for specified precision operation |
| Synchronization | ISO120 family synchronization feature |
ISO120SG ceramic dual in-line package (cdip) 腳位配置指南
ISO120SG（ceramic dual in-line package (cdip) 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： ISO120SG.
請參閱 資料表 以查看完整腳位配置。
典型應用
ISO120SG 適用於 6 應用s: Industrial Process-Control Signal Isolation, Medical Patient-Monitoring Front End, Power-Conversion Feedback Isolation, Data-Acquisition and Instrumentation, Isolated Sensor Interface for Industrial Equipment, Isolated Communications and Control Interfaces.
Industrial Process-Control Signal Isolation
ISO120SG fits isolated process-control channels where a low-level differential sensor signal must cross from a field-side ground domain to a controller-side ground domain. Its 60 kHz bandwidth supports process signals without requiring the reduced-bandwidth precision configuration, while the 1500 Vrms family isolation rating can help separate hazardous or noisy field wiring from control electronics. The capacitive barrier avoids a conductive input-output path. Design confirmation is still required for the final isolation standard, working voltage, creepage, clearance, and temperature range.
推薦
Medical Patient-Monitoring Front End
ISO120SG can be considered for isolated low-level biomedical signal acquisition because it transfers a differential analog signal across a capacitive barrier and offers a precision isolation-amplifier architecture. The 60 kHz mode is useful for many sensor and instrumentation signals, while the family’s low nonlinearity and drift-focused option support measurement accuracy. Medical use requires separate verification of applicable patient-protection requirements, isolation type, leakage, creepage, clearance, and certification; those claims are not established by the supplied snippets.
推薦
Power-Conversion Feedback Isolation
ISO120SG is suitable for power-conversion feedback paths when the controller needs a voltage or current measurement transferred across a high-common-mode barrier. Its 60 kHz bandwidth allows feedback information to pass without the extreme bandwidth of a communications isolator, and user-controlled carrier frequency provides a design variable for system filtering and interference management. The engineer must still verify supply voltage, input range, output swing, isolation working voltage, and thermal performance against the complete ISO120 datasheet.
推薦
Data-Acquisition and Instrumentation
ISO120SG can isolate a differential instrumentation input from an ADC, data-acquisition module, or laboratory measurement system. The 60 kHz bandwidth is appropriate for many sensor and transducer signals, and the modulation approach avoids relying on barrier capacitance as a linear analog signal path. For high-resolution acquisition, the design should account for the device’s gain, input range, output settling, bandwidth, and accuracy specifications, which are not fully present in the supplied snippets and must be taken from the manufacturer datasheet.
推薦
Isolated Sensor Interface for Industrial Equipment
ISO120SG is a candidate for pressure, temperature, current, and other differential sensor interfaces where the sensor is exposed to substantial ground-potential differences. The capacitive barrier and high IMR at 60 Hz help reduce common-mode interference transfer, while the available 60 kHz mode preserves useful signal bandwidth. The package conflict in the supplied distributor records is especially important here: confirm whether the production suffix uses the 16-CDIP or 24-CDIP outline before selecting connectors, sockets, or PCB land patterns.
推薦
Isolated Communications and Control Interfaces
ISO120SG may be used where an analog control signal must pass between equipment domains with different ground potentials, such as an actuator-control partition or an industrial communication controller. The 60 kHz bandwidth is more than adequate for many slow analog-control signals, and user-controlled carrier frequency allows the system to select a compatible operating condition. Because this is an analog isolation amplifier rather than a digital isolator, signal integrity, bandwidth settling, and isolation capacitance must be evaluated in the actual channel.
推薦
推薦產品摘要
工程參考資料，適用於 ISO120SG — 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 | ISO120G | ISO120BG | ISO121G | ISO121BG |
|---|---|---|---|---|---|
| Package | CDIP package; supplier descriptions conflict | CDIP package; exact suffix must be verified | CDIP package; exact suffix must be verified | CDIP package; exact suffix must be verified | CDIP package; exact suffix must be verified |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | Precision isolation amplifier | Related ISO120 isolation amplifier | Related ISO120 isolation amplifier | Related ISO121 isolation amplifier | Related ISO121 isolation amplifier |
主要差異化特點
- Low-cost precision isolation-amplifier positioning (對比Generic isolated signal-chain solutions)
- User-controlled carrier frequency (對比ISO121 family variants listed in supplied comparison data)
- Low nonlinearity in precision configuration (對比Higher-bandwidth communication-oriented isolation devices)
設計說明
Resolve the package conflict before layout: DigiKey identifies ISO120SG as a 16-CDIP, while the Heisener result describes a 24-CDIP with 16 leads. Use the Texas Instruments ordering information, package drawing, and pin table as the authority. A wrong footprint can prevent assembly or cause incorrect connections to the isolation barrier and supply pins.
Treat the isolation barrier, input-side ground, and output-side ground as separate layout regions. Keep the analog input path and associated filtering away from output-side switching nodes, maintain the manufacturer’s required creepage and clearance, and avoid placing high-voltage or fast-current copper beneath the barrier. Verify the final layout against the applicable isolation and safety requirements rather than relying only on nominal isolation voltage.
Use the 60 kHz no-external-component mode only when the resulting signal bandwidth is adequate. When precision nonlinearity and offset-drift limits are required, use the manufacturer’s two-capacitor configuration and accept the corresponding bandwidth reduction. Place input, output, bypass, and optional compensation capacitors according to the datasheet return path so that parasitic loading does not distort the isolation channel.
合規資訊
The supplied data identifies partial-discharge testing for the ISO120 family but does not provide verified ISO120SG RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. Compliance must be confirmed from the current manufacturer product documentation.
