HEF4541BT-Q100J

Programmable Timers And Oscillators Overview

The HEF4541BT-Q100J is a programmable timer manufactured by Nexperia, qualified to AEC-Q100 Grade 1 standards for automotive applications. It integrates a 16-stage binary counter, an RC oscillator, and automatic power-on reset logic. The device operates on a single supply voltage ranging from 3 V to 15 V. Oscillator frequency is determined by external components RTC and CTC, covering a range of 1 Hz to 100 kHz, or it can accept an external clock signal at the RS input. The counter divides the frequency by 2^8, 2^10, 2^13, or 2^16 based on address inputs A0 and A1. It features low quiescent power dissipation and high noise immunity.

Programmable Timers And Oscillators Feature Summary

• Automotive qualification in accordance with AEC-Q100 (Grade 1) for -40 °C to +125 °C operation
• Integrated 16-stage binary counter with selectable division ratios (2^8, 2^10, 2^13, 2^16)
• Wide supply voltage range from 3.0 V to 15.0 V with CMOS low power dissipation
• ESD protection exceeding 2000 V (HBM) and 1000 V (CDM)

Programmable Timers And Oscillators Applications

• Automotive timing circuits requiring AEC-Q100 compliance
• Programmable delay generation using external RC components
• Frequency division stages in digital control systems

Programmable Timers And Oscillators Procurement Notes

Verify the specific ordering suffix matches the required package variant. The HEF4541BT-Q100J designation indicates the SO14 plastic small outline package (SOT108-1). Confirm that the temperature grade corresponds to the application's thermal requirements, as this part supports up to +125 °C ambient temperature. Ensure design reviews account for the specified derating curves above 100 °C.

Programmable Timers And Oscillators Selection Notes

Select this component when an integrated timer solution with automotive reliability is needed. The internal oscillator requires external resistors and capacitors; ensure RTC values exceed the LOCMOS 'ON' resistance (typically 500 Ω at 5 V). For precise timing, maintain CTC values greater than inherent stray capacitance. Verify that the maximum clock frequency limits align with the system's signal transition rates.

Programmable Timers And Oscillators Part Context

This part belongs to the HEF4541B-Q100 family of programmable timers. The 'BT' suffix denotes the SO14 surface-mount package, while 'Q100' signifies AEC-Q100 Grade 1 qualification. The 'J' suffix typically refers to the tape and reel packaging format used for automated assembly. It serves as a robust alternative to discrete timer implementations in space-constrained automotive designs.

Programmable Timers And Oscillators Replacement Considerations

Direct pin-compatible replacements within the same family include other variants of the HEF4541B-Q100 series. Cross-family replacements require verification of logic levels, output drive capabilities, and package dimensions. Ensure any substitute maintains the 3 V to 15 V operating range and meets the specific AEC-Q100 grade if automotive use is intended.