ALD4501SEL

Programmable Timers And Oscillators Overview

The ALD4501SEL is a quad precision high-speed micropower timer manufactured by Advanced Linear Devices Inc. It integrates four independent monolithic timing circuits built with advanced silicon gate CMOS technology, housed in a 20-pin Small Outline (SOIC) package. The device operates on a supply voltage ranging from 2V to 12V, with a typical supply current of 150 µA. Key electrical characteristics include a typical oscillation frequency of 2 MHz at 5V, discharge output sinking current of 40 mA, and extremely low trigger, threshold, and reset currents of 10 pA typical. Each timer supports monostable, astable, or fixed 50% duty cycle modes.

Programmable Timers And Oscillators Feature Summary

• Quad configuration with four independent timers capable of monostable, astable, or 50% duty cycle operation
• High-speed performance with typical oscillation frequency of 2 MHz at 5V supply
• Micropower consumption with typical supply current of 150 µA and low supply current spikes
• CMOS, NMOS, and TTL compatible inputs and outputs

Programmable Timers And Oscillators Applications

• High speed one-shot pulse generation
• Precision timing and sequential timing circuits
• Long delay timers
• Pulse width and pulse position modulation
• Missing pulse detection and frequency division

Programmable Timers And Oscillators Procurement Notes

Verify the specific suffix 'SEL' corresponds to the 20-pin Plastic SOIC package with an operating temperature range of 0°C to +70°C. Confirm RoHS compliance status as the 'L' suffix denotes lead-free construction. Ensure compatibility with standard surface-mount assembly processes for SOIC-20 packages.

Programmable Timers And Oscillators Selection Notes

Select the ALD4501SEL when multiple synchronized timing channels are required in a compact surface-mount form factor. Consider this component for battery-operated environments due to its low power dissipation. Verify that the required timing resolution and frequency range align with the device's 2 MHz maximum frequency capability and 150 µA typical current draw.

Programmable Timers And Oscillators Part Context

The ALD4501 series includes variants such as the ALD4501PEL (20-pin Plastic DIP) and ALD4501DE (20-pin CERDIP). The SEL variant specifically utilizes the 20-pin Small Outline package. All variants share the same internal quad timer architecture but differ in physical packaging and operating temperature ranges.

Programmable Timers And Oscillators Replacement Considerations

The datasheet notes functional equivalence to the NE555 for individual timers, though the ALD4501 offers expanded frequency ranges and lower power. No direct cross-referenced substitute part numbers are provided in the source material.