TEA1708T/1J

Overview

The TEA1708T/1J is an automatic discharge integrated circuit designed for X capacitors in AC-connected power supplies. It achieves low standby power consumption, typically 1 mW at 230 V AC. The device features an integrated 500 V clamping circuit that protects against mains surges without requiring external metal-oxide varistors. It operates by detecting voltage thresholds between high-voltage pins to activate a discharge current limited internally to approximately 2.3 mA. The discharge delay timer is set externally using a capacitor connected between the TMR1 and TMR2 pins.

Feature Summary

• Integrated 500 V clamp eliminates the need for external metal-oxide varistors
• Self-supplied operation requires no external bias voltage
• Internally limited discharge current of 2.3 mA
• Adjustable discharge delay via external low-voltage capacitor

Applications

• AC-connected power supplies with X-capacitors greater than 100 nF
• Applications requiring low load standby power
• Power supplies needing EMI reduction while maintaining efficiency

Procurement Notes

Verify the package type matches the required SO8 plastic small outline configuration. Confirm the ordering suffix corresponds to the specific tape and reel or cut tape packaging format needed for the assembly process. Ensure the component grade meets the project specifications as standard commercial grade is indicated.

Selection Notes

Select this IC for designs where minimizing standby power is critical. The internal 500 V clamp simplifies surge protection design. External resistors and capacitors must be chosen to meet discharge timing requirements and ensure the X-capacitor discharges below 60 V within the specified time frame after mains disconnect.

Part Context

This component belongs to the NXP GreenChip series of power management solutions. It is specifically engineered to address energy efficiency standards by managing X-capacitor discharge in offline power converters. The TEA1708T/1J serves as a specialized interface between the high-voltage mains input and the filtering components.

Replacement Considerations

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