HEF4541BT,518

Programmable Timers And Oscillators Overview

The HEF4541BT,518 is a programmable timer from the Nexperia HEF4541B series, housed in a 14-lead SO14 (SOT108-1) plastic small outline package. It integrates a 16-stage binary counter, an RC oscillator, and automatic power-on reset logic. The device operates on a supply voltage range of 3 V to 15 V with CMOS low power dissipation. External components RTC and CTC set the oscillator frequency between 1 Hz and 100 kHz, or an external clock can be applied to input RS. The counter divides the frequency by 2^8, 2^10, 2^13, or 2^16 based on address inputs A0 and A1.

Programmable Timers And Oscillators Feature Summary

• Integrates a 16-stage binary counter with selectable division ratios (2^8, 2^10, 2^13, 2^16).
• Includes an internal RC oscillator controlled by external resistor (RTC) and capacitor (CTC).
• Features automatic power-on reset and master reset capabilities for reliable initialization.
• Operates over an ambient temperature range of -40 °C to +125 °C.

Programmable Timers And Oscillators Applications

• Programmable timing circuits requiring precise frequency division.
• Clock generation systems utilizing external RC components.
• Digital counters in industrial control applications.

Programmable Timers And Oscillators Procurement Notes

Verify the ordering suffix '518' against official Nexperia documentation to confirm specific reel packaging or tape-and-reel specifications. Ensure the selected variant matches the required SO14 package dimensions and thermal characteristics defined in the SOT108-1 outline.

Programmable Timers And Oscillators Selection Notes

Select this component when a single-chip solution combining a programmable timer and binary counter is required. Verify that the external timing components (RTC, CTC) fall within the recommended ranges (10 kΩ ≤ RTC ≤ 1 MΩ; CTC ≥ 100 pF) to maintain oscillation accuracy across the specified temperature range.

Programmable Timers And Oscillators Part Context

This part belongs to the HEF4541B family of programmable timers manufactured by Nexperia USA Inc. The 'BT' designation indicates the surface-mount SO14 package, while the suffix '518' typically denotes specific packaging details such as tape and reel configuration for automated assembly.

Programmable Timers And Oscillators Replacement Considerations

Direct replacements must match the HEF4541B functional specification and SO14 pinout. Non-Nexperia equivalents require verification of supply voltage compatibility (3 V–15 V), propagation delay characteristics, and ESD protection levels.