U6046B-MFPG3Y

Overview

The U6046B-MFPG3Y is a bipolar long-term timer designed for automotive applications to limit high-load operation time. It features an RC oscillator where external components R2 and C2 determine timing characteristics, allowing delay times from 3.7 seconds to 20 hours. The device includes two debounced inputs (ON/OFF) and a toggle input, with a relay control output capable of driving loads up to 300 mA. It incorporates load-dump protection, RF interference shielding, and power-on reset functionality to prevent unintentional current consumption.

Feature Summary

• RC Oscillator Timing: Delay range adjustable from 3.7s to 20h via external resistor and capacitor.
• Automotive Protection: Includes load-dump protection, RF interference protection, and ISO/TR7637-1 compliance.
• Relay Driver Output: Open-collector Darlington circuit with integrated 23V Z-diode; max static collector current 300 mA.
• Input Flexibility: Features debounced ON/OFF inputs and a toggle input for manual interruption or switching.

Applications

• Rear window heating timers
• Long-term timers for high loads in automotive environments
• Automatic shutoff circuits for current-consuming devices

Procurement Notes

Verify the ordering suffix MFPG3Y indicates SO8 package in tape and reel format. Confirm lead-free status as specified in the ordering information table. Ensure compatibility with 12V automotive supply requirements including the recommended R1C1 filter circuit for interference protection.

Selection Notes

Select external R2 and C2 values based on the desired delay time using Table 6-1. For frequencies between 1 Hz and 20 kHz, ensure R2 is significantly larger than the internal 2 kΩ discharge resistance for stable frequency. Use the 510Ω resistor and 47µF capacitor at the VS pin for standard 12V operation to meet surge immunity standards.

Part Context

This component belongs to the U6046B family of bi-polar long-term timers originally developed by Atmel Corporation, now part of Microchip Technology. The specific MFPG3Y suffix denotes the SO8 surface-mount package configuration supplied in a taped and reeled format for automated assembly processes.

Replacement Considerations

Compatible variants within the same family include U6046B-MFPY (SO8 tubed) and U6046B-MY (DIP8). These share identical electrical specifications and pinouts but differ in packaging type and reel/tube configuration.