The ISO124U/1K from Texas Instruments is a precision analog isolation amplifier that uses capacitive isolation and duty-cycle modulation-demodulation technology to transfer analog signals across a galvanic isolation barrier. It provides a fixed unity gain of 1V/V, with rated input and output signal ranges of ±10V.
The device is rated for 1500Vrms continuous isolation voltage, and every unit is tested at 2400Vac for one second. It provides an isolation-mode rejection ratio of 140dB at 60Hz, a typical gain error of ±0.05% FSR, and maximum nonlinearity of ±0.010% FSR.
ISO124 offers a 50kHz small-signal bandwidth, a 2V/μs slew rate, and a typical input resistance of 200kΩ. The isolated input and output sections require separate bipolar supplies ranging from ±4.5V to ±18V, with ±15V commonly used. Its operating-temperature range is -25°C to +85°C.
The ISO124U/1K is supplied in a 28-lead wide-body SOIC DVA package measuring approximately 20.01 × 6.61mm. The “/1K” suffix specifies 1,000 units in large tape-and-reel packaging for automated SMT assembly.
Key Specifications:
- Manufacturer: Texas Instruments
- Manufacturer Part Number: ISO124U/1K
- Device Type: Precision Analog Isolation Amplifier
- Number of Channels: 1
- Nominal Gain: 1V/V, Fixed Unity Gain
- Input Voltage Range: ±10V
- Output Voltage Range: ±10V
- Continuous Isolation Voltage: 1500Vrms
- Production High-Voltage Test: 2400Vac for 1 Second
- Isolation-Mode Rejection: 140dB at 60Hz
- Typical Gain Error: ±0.05% FSR
- Maximum Gain Error: ±0.50% FSR
- Typical Nonlinearity: ±0.005% FSR
- Maximum Nonlinearity: ±0.010% FSR
- Small-Signal Bandwidth: 50kHz
- Slew Rate: 2V/μs
- Input Resistance: 200kΩ
- Supply-Voltage Range: ±4.5V to ±18V
- Operating Temperature: -25°C to +85°C
- Package: 28-Lead Wide-Body SOIC, DVA
- Packaging: Large Tape and Reel
- Standard Package Quantity: 1,000 Units
Typical Applications:
Suitable for industrial process control, thermocouple and RTD isolation, pressure bridges, flow meters, 4–20mA loop isolation, ground-loop elimination, motor and SCR control, power monitoring, data acquisition, and test equipment.
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