Texas Instruments ISO124UE4

Overview

ISO124UE4 from Texas Instruments is a precision analog isolation amplifier with galvanic isolation via integrated 2-pF differential capacitive barrier, ±10-V input/output range, 50-kHz signal bandwidth, and 140-dB isolation mode rejection at 60 Hz - used in industrial transducer isolation, 4–20-mA loop interfaces, and ground-loop elimination circuits.

For engineers reviewing the ISO124UE4 datasheet, ISO124UE4 pinout, ISO124UE4 application, or ISO124UE4 equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional trade-offs.

Technical Context

The ISO124UE4 employs duty-cycle modulation-demodulation: input voltage drives a 500-kHz triangular integrator waveform across the capacitive barrier; output section reconstructs analog VOUT = VIN using matched laser-trimmed circuitry and ripple suppression via sample-and-hold stages. No external components are required for basic operation.

It features dual isolated supply domains (±VS1/Gnd1 on high side, ±VS2/Gnd2 on low side), fixed unity gain (G = 1), and operates over ±4.5 V to ±18 V per supply rail. Input offset drift is 200 µV/°C; nonlinearity is ≤0.010% FSR; IMR remains ≥140 dB up to 60 Hz.

Key Specifications

Pinout & Package

ISO124UE4 is packaged in a 16-pin plastic DIP (PDIP-16) with body size 17.90 mm × 7.50 mm. Pin numbering follows standard dual-in-line top-view orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision isolation amplifier applications.

Compared with ISO124UE4, ISO122P offers greater supply flexibility but higher power draw, while AMC1301DWVR shifts signal processing to the digital domain - making ISO124UE4 optimal for legacy analog systems needing plug-in unity-gain isolation with minimal redesign.

Availability

ISO124UE4 is available at Aetrix Electronics and suitable for industrial process control, motor monitoring, and PC-based data acquisition requiring stable component supply and long-term manufacturability.

Supply support for ISO124UE4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and isolation solutions.

The ISO124 product line was designed specifically for high-fidelity analog signal isolation in harsh industrial environments - emphasizing low drift, high IMR, and guaranteed 1500-Vrms isolation integrity without external components.

FAQ

What is the maximum continuous isolation voltage rating for ISO124UE4?

The ISO124UE4 is rated for 1500 Vrms continuous AC isolation at 60 Hz, with 100% unit testing at 2400 Vrms for 1 second and ≤5-pC partial discharge. This rating applies to the PDIP-16 package and is validated per VDE0884-compliant partial discharge methodology - ensuring long-term reliability in safety-critical industrial installations.

Does ISO124UE4 require external components to achieve specified accuracy?

No, ISO124UE4 achieves its full datasheet specifications - including 0.010% nonlinearity and 200 µV/°C offset drift - without any external components. Only mandatory 1-µF tantalum bypass capacitors on each supply rail (+VS1, –VS1, +VS2, –VS2) are required for stable operation; no gain-setting resistors, trim pots, or compensation networks are needed.

Can ISO124UE4 operate from single-supply rails on either side?

Yes, ISO124UE4 supports single-supply operation on the high side using a Zener-derived negative rail (e.g., 5.1-V Zener), as documented in Figure 21 of the datasheet. The low side must remain dual-supply (±VS2) to maintain ±10-V output swing; however, the high-side input can accept 0–10-V or –2–+10-V ranges depending on bias configuration.

What is the carrier frequency used in ISO124UE4's modulation scheme?

The ISO124UE4 uses an internal 500-kHz oscillator to generate its duty-cycle modulation carrier. This fixed frequency defines the Nyquist limit (250 kHz) for alias-free operation and determines ripple frequency at the output - enabling predictable filter design for applications requiring sub-mV residual ripple.

How does ISO124UE4 handle high dV/dt transients across the isolation barrier?

ISO124UE4 maintains reliable operation up to ~1000 V/µs dV/dt; beyond this, sense amplifier false triggering may occur, causing spurious output errors. To mitigate, reduce supply voltages below ±15 V - lowering slew rate to ~500 V/µs - or add external RC snubbers on high-dV/dt nodes. Its 2-pF capacitive barrier inherently provides excellent high-frequency transient immunity.