ISO124U - ±10V Precision Isolation Amplifier | Texas Instruments
MPN: ISO124U ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ISO124U Overview
An isolation amplifier is a signal-conditioning semiconductor that transfers an analog input voltage while maintaining galvanic separation between the input-side and output-side circuitry. The isolation amplifier category belongs to the broader instrumentation-amplifier and signal-conditioning hierarchy, where accuracy, noise rejection, common-mode immunity, and safe voltage separation are central design requirements. ISO124U is intended to preserve signal integrity while transferring measurements across high-voltage, industrial, or safety-related boundaries.
The ISO124U uses a differential capacitive barrier and a duty-cycle modulation-demodulation technique to transmit the signal digitally across the isolation boundary. According to the manufacturer datasheet, this approach prevents barrier characteristics from directly affecting signal integrity and provides strong high-frequency transient immunity. The device supports bipolar operation, a fixed unity-gain configuration, and supply rails from ±4.5 V to ±18 V.
Key specifications include 0.010% maximum nonlinearity, 50 kHz signal bandwidth, and input-offset-voltage drift of 200 µV/°C. Quiescent current is ±5 mA on VS1 and ±5.5 mA on VS2. The input-side and output-side supply domains allow the output side to operate at a different voltage reference from the input side, which is useful when measuring signals across high-side or floating power domains. The 8-pin SOIC package also supports conventional surface-mount assembly.
Typical uses include isolated current and voltage measurement, industrial process-control acquisition, power-converter feedback isolation, data-acquisition systems, instrumentation front ends, and high-side sensing. The isolation barrier allows the sensing circuit to remain electrically separate from the controlled equipment, provided the PCB layout, creepage, clearance, decoupling, and barrier requirements follow the manufacturer’s guidance.
When designing around ISO124U, separate input-side and output-side ground planes and maintain the required isolation boundary. Keep analog traces short and place input and output bypass capacitors near their respective supply pins. The fixed unity-gain configuration simplifies signal-chain design, while the ±10 V input range and 50 kHz bandwidth limit the design to suitable analog signal levels and frequency content.
This page combines verified manufacturer and distributor data, practical application guidance, and verified cross-reference results for ISO124U. It is intended to help engineers evaluate supply requirements, signal bandwidth, isolation placement, package compatibility, and sourcing without relying on unverified generic substitutions.
Drop-in alternatives for ISO124U — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ISO124U (same form factor and footprint) — differing in Input Offset Voltage Drift, Isolation Barrier, Maximum Nonlinearity, Mounting Type, Package.
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View Datasheet →ISO124U Maximum Ratings & Electrical Characteristics
| Product Type | Precision isolation amplifier |
| Input Voltage Range | ±10 V |
| Signal Bandwidth | 50 kHz |
| Maximum Nonlinearity | 0.010% |
| Input Offset Voltage Drift | 200 µV/°C |
| Supply Voltage Range | ±4.5 V to ±18 V |
| VS1 Quiescent Current | ±5 mA |
| VS2 Quiescent Current | ±5.5 mA |
| Gain Configuration | Fixed unity gain |
| Operating Mode | Bipolar |
| Isolation Barrier | 2-pF differential capacitive barrier |
| Isolation Method | Duty-cycle modulation-demodulation |
| Package | 8-pin SOIC (DVA) |
| Mounting Type | Surface mount |
| Operating Temperature | -25°C to +85°C |
| High-Voltage Testing | 100% tested for high-voltage breakdown |
| Isolation Rating | 1500 Vrms rated |
ISO124U 8-pin soic (dva) Pin Configuration Guide
Pin configuration for ISO124U (8-pin soic (dva) package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for ISO124U.
Refer to the datasheet for full pin configuration.
Typical Applications
ISO124U is suitable for 6 applications: Isolated Voltage Sensing, Industrial Process-Control Acquisition, Power-Converter Feedback Isolation, Data-Acquisition Systems, High-Side Current Feedback, Instrumentation and Test Equipment.
Isolated Voltage Sensing
ISO124U fits isolated voltage sensing because it accepts a ±10 V input range and provides a verified maximum nonlinearity of 0.010%. Place the device between a high-voltage or floating sensor domain and the measurement system, with VS1 powering the input side and VS2 powering the output side. Its 50 kHz signal bandwidth accommodates many process and power-control signals while rejecting the need for a direct galvanic connection across the isolation barrier. Confirm the sensor voltage, bandwidth, supply levels, isolation layout, and system accuracy budget before finalizing the design.
Recommended
Industrial Process-Control Acquisition
The ISO124U is suitable for industrial process-control acquisition when a controller must monitor a signal referenced to a separate or hazardous voltage domain. Its 200 µV/°C input-offset drift and 0.010% maximum nonlinearity support repeatable measurement, while the 50 kHz bandwidth covers many sensor and control-loop signals. Use the fixed unity-gain configuration to simplify analog conditioning, and maintain separate bypass networks for VS1 and VS2. The isolation barrier helps separate the measurement path, but transient immunity, clearance, creepage, and grounding must be validated at the system level.
Recommended
Power-Converter Feedback Isolation
ISO124U can isolate feedback or sensing signals in power-converter systems where the control circuitry must not share ground with the switching domain. The ±10 V input range is useful for scaled feedback voltages, and the 50 kHz bandwidth provides margin for control-loop signals below the device limit. The isolation barrier transmits the signal through differential capacitive coupling rather than a direct conductive input-to-output path. Validate loop bandwidth, supply ripple, switching-node layout, creepage, clearance, and transient immunity because those requirements depend on the converter topology and safety class.
Recommended
Data-Acquisition Systems
ISO124U is appropriate for a data-acquisition front end that needs to preserve analog signal quality across a high-side or floating measurement domain. Its 0.010% maximum nonlinearity and fixed unity gain make system calibration easier, while 50 kHz bandwidth covers many sensor signals before digitization. Connect the input and output grounds according to the isolation architecture, not by casually joining them on the PCB. The following ADC should be selected for the required resolution, sample rate, input range, and common-mode compatibility; isolation alone does not determine the complete acquisition accuracy.
Recommended
High-Side Current Feedback
ISO124U can be used to isolate a scaled high-side current-feedback signal when the sensed voltage is within its ±10 V input range. The device’s separate VS1 and VS2 domains allow the input-side sensing electronics and output-side acquisition electronics to operate at different ground references. Its 50 kHz bandwidth supports many feedback waveforms, but the actual usable bandwidth also depends on the front-end amplifier, filter, sensor response, and switching environment. Verify input common-mode limits, isolation rating, PCB barrier construction, and temperature drift before using it in a high-side power circuit.
Recommended
Instrumentation and Test Equipment
ISO124U is useful in instrumentation and test equipment when a measurement input must be transferred to a safer, remote, or independently referenced acquisition section. The 0.010% maximum nonlinearity and 200 µV/°C offset drift provide useful precision characteristics for calibrated measurement paths, while fixed unity gain simplifies system documentation. The 50 kHz bandwidth is suitable for many low- and moderate-frequency sensor signals but is not intended for arbitrary wideband instrumentation. Confirm input-referenced error, calibration method, isolation safety, and analog grounding before integrating it into a bench instrument.
Recommended
Recommended Products Summary
Engineering reference data for ISO124U — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISO124U/1K | ISO124U |
|---|---|---|---|
| Package | 8-pin SOIC (DVA) | 8-pin SOIC | 8-pin SOIC (DVA) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | Precision isolation amplifier | Isolation amplifier | Precision isolation amplifier |
| Signal Bandwidth | 50 kHz | 50 kHz reported | 50 kHz |
| Maximum Nonlinearity | 0.010% | 0.010% reported | 0.010% |
| Gain Configuration | Fixed unity gain | Fixed unity gain reported | Fixed unity gain |
Key Differentiators
- Precision nonlinear-error specification (vs ISO124U/1K)
- Bipolar isolated-signal architecture (vs ISO124U/1K)
- Capacitive digital signal transfer (vs ISO124U/1K)
Design Notes
Maintain the manufacturer-defined isolation barrier across the PCB rather than routing copper, planes, or signal traces beneath the isolation region. Keep the input-side and output-side ground domains separated, place the device in accordance with the SOIC DVA footprint, and route each analog connection away from switching nodes. The verified datasheet describes a 2-pF differential capacitive barrier, so board geometry and contamination control directly affect the isolation implementation.
Design separate VS1 and VS2 supply networks for the input and output domains, each staying within the verified ±4.5 V to ±18 V range. Place the required bypass capacitors close to their corresponding supply pins and observe the datasheet’s polarity and grounding requirements. Estimated supply-current figures should use the specified quiescent currents of ±5 mA on VS1 and ±5.5 mA on VS2 plus external load current; these are application estimates, not guaranteed total board consumption.
Use the verified 50 kHz signal bandwidth as an upper design constraint, not merely a nominal marketing specification. Place input filtering close to the device, keep the ±10 V input within the supported range, and account for offset drift of 200 µV/°C in the overall error budget. If the source contains fast transients or large common-mode excursions, validate the complete front end rather than assuming the isolation amplifier alone will control all errors.
Compliance Information
The supplied verified data confirms 100% high-voltage-breakdown testing and a 1500 Vrms isolation rating, but it does not state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification status. Those fields remain unknown or not_applicable rather than assumed.
