ISO102B

Overview

The ISO102B is a capacitive coupled isolation buffer amplifier manufactured by Texas Instruments. It features a 24-pin ceramic DIP package with a rated continuous isolation voltage of 1500Vrms at 60Hz and 2121VDC. The device operates within an ambient temperature range of -25°C to +85°C, utilizing ±15V power supplies (range ±10V to ±20V). Key electrical specifications include a small-signal bandwidth of 70kHz, a slew rate of 0.5V/µs, and an initial gain error of ±0.1% FSR. Input offset voltage is specified at ±25mV, with a maximum input voltage range of ±10V.

Feature Summary

• Hermetically sealed hybrid construction using high-voltage tungsten thick-film ceramic capacitors for the isolation barrier
• Digital encoding of analog signals via voltage-to-frequency conversion and phase-lock loop decoding
• Integrated low-drift +5V reference outputs for bipolar offset setting and signal conditioning
• Optional external adjustment capabilities for gain and offset voltage

Applications

• Transducer channel isolation for thermocouples, RTDs, pressure bridges, and flow meters
• Isolation in 4mA to 20mA current loops
• Motor and SCR control systems
• Elimination of ground loops in measurement circuits
• Biomedical and analytical measurements

Procurement Notes

Verify that the specific part number corresponds to the B-grade variant, which offers tighter accuracy specifications compared to the standard ISO102. Confirm the package type is the 24-pin ceramic DIP. Ensure compliance with RoHS directives if required for the application environment. Check datasheet notes regarding the hermetic seal integrity and operating temperature limits.

Selection Notes

Select the ISO102B when high accuracy is required alongside galvanic isolation. The B-grade designation indicates improved initial gain error and offset voltage performance over the standard ISO102. Consider the 70kHz bandwidth and 0.5V/µs slew rate for signal fidelity requirements. Evaluate the need for optional external gain and offset adjustments based on system calibration needs.

Part Context

The ISO102B belongs to the ISO102/ISO106 family of capacitive coupled isolation amplifiers from Burr-Brown, now part of Texas Instruments. These devices utilize digital signal transmission across a ceramic barrier to achieve isolation without magnetic components. The ISO102 series is distinguished by its 24-pin package and 1500Vrms rating, contrasting with the 40-pin ISO106 series rated for 3500Vrms.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.