ISO122PE4

Overview

The ISO122PE4 is a precision isolation amplifier from Texas Instruments, available in a 16-pin plastic DIP package. It utilizes a duty cycle modulation-demodulation technique to transmit signals digitally across a 2-pF differential capacitive barrier, ensuring high reliability and excellent high-frequency transient immunity. The device features a fixed unity gain configuration with a maximum nonlinearity of 0.020% and a signal bandwidth of 50 kHz. It supports bipolar operation with an output voltage range of ±10 V and operates on supply voltages ranging from ±4.5 V to ±18 V. The unit is rated for 1500 Vrms continuous isolation voltage.

Feature Summary

• High Isolation Mode Rejection: Achieves 140 dB IMR at 60 Hz for effective noise suppression.
• Digital Signal Transmission: Uses duty cycle modulation to transmit signals across the barrier without affecting integrity.
• Zero External Components: Fixed unity gain configuration requires no external components for basic operation.
• Robust Barrier Reliability: 100% tested for high-voltage breakdown with embedded barrier capacitors.

Applications

• Transducer Isolator
• Isolator for Thermocouples, RTDs, Pressure Bridges, and Flow Meters
• 4-mA to 20-mA Loop Isolation
• Ground Loop Elimination
• Motor and SCR Control

Procurement Notes

Verify that the specific ordering suffix PE4 corresponds to the 16-pin PDIP package variant as documented in the manufacturer's datasheet. Confirm compliance with RoHS standards and lead-free status. Ensure the procurement specification matches the required operating temperature range of -25°C to 85°C. Cross-reference the part number against the latest orderable addendum to confirm current production status and availability.

Selection Notes

Select the ISO122PE4 when a cost-effective, precision isolation solution with fixed unity gain is required. It is suitable for applications demanding high common-mode rejection and reliable galvanic isolation up to 1500 Vrms. Consider this component for systems requiring bipolar power supplies within the ±4.5 V to ±18 V range. Evaluate thermal resistance parameters if operating in enclosed environments or at elevated ambient temperatures.

Part Context

The ISO122 series represents Texas Instruments' precision low-cost isolation amplifiers. The PE4 suffix denotes the specific 16-pin Plastic Dual In-Line Package (PDIP) variant. This family employs a novel digital transmission method across a capacitive barrier, distinguishing it from traditional analog isolation techniques. The device integrates all necessary circuitry for signal conditioning and isolation within a single monolithic structure.

Replacement Considerations

Consult the official datasheet for direct pin-compatible alternatives within the ISO122 family. Verify that any substitute maintains the same 16-pin PDIP footprint and electrical characteristics, including the 1500 Vrms isolation rating and 50 kHz bandwidth. Ensure the replacement part supports the required ±10 V output swing and bipolar supply operation.