PT8A2541WE

Programmable Timers And Oscillators Overview

The PT8A2541WE is a universal timer controller manufactured by Diodes Incorporated, designed for fixed-timer safety power control in 120V/240V AC systems. It operates with an internal RC oscillator or extracted AC clock (50/60Hz selectable via the ACSEL pin). The device features a shunt regulator providing a stable 4.7V typical supply voltage and drives external high-sensitivity SCRs. Timer duration is configurable via TS0-TS2 pins, supporting intervals from 15 to 480 minutes. It includes a Quick Test Mode (QTM) for manufacturing efficiency and supports button-based ON/OFF/RESET functions.

Programmable Timers And Oscillators Feature Summary

• Configurable timer durations: 15, 30, 45, 60, 90, 120, 240, or 480 minutes via TS0-TS2 pins
• Built-in shunt regulator outputting 4.2V–5.2V for internal circuit stability
• Selectable AC clock source (50Hz or 60Hz) using the ACSEL pin
• Quick Test Mode (QTM) reduces test times significantly for manufacturers

Programmable Timers And Oscillators Applications

• Universal timer controllers for safety power cutoff
• AC-powered appliances requiring automatic shut-off
• Systems driving external SCR loads

Programmable Timers And Oscillators Procurement Notes

Verify the suffix 'x' (A-H) determines the specific internal timer duration. Confirm package availability as DIP-8 or SOIC-8. Check datasheet notes regarding lead-free and green status for environmental compliance requirements.

Programmable Timers And Oscillators Selection Notes

Select based on required timer duration mapped to suffix A-H. Choose DIP-8 or SOIC-8 package. Ensure ACSEL pin configuration matches the local mains frequency (50Hz vs 60Hz). Verify SCR gate trigger current compatibility (approx. 200uA).

Programmable Timers And Oscillators Part Context

Part of the PT8A2521-2543 family. The PT8A2541 variant specifically supports optional 50/60Hz selection and configurable timers via hardware pins, unlike fixed-timer variants in the series.

Programmable Timers And Oscillators Replacement Considerations

Substitutes within the PT8A254x series (e.g., PT8A2542WE, PT8A2543WE) are available but differ in button functionality (On/Off vs Reset). Verify timer suffixes match application requirements.

Programmable Timers And Oscillators FAQ

How is the timer duration configured?

The timer duration is set by connecting TS0, TS1, and TS2 pins to logic high or low states, corresponding to values from 000 (15 min) to 111 (480 min).

What is the function of the ACSEL pin?

The ACSEL pin selects the AC clock frequency. Connecting it to VCC sets 50Hz operation; leaving it floating or connected to GND defaults to 60Hz.

How does Quick Test Mode (QTM) work?

QTM accelerates testing by reducing timer durations proportionally (e.g., 15 mins becomes 2 seconds). It is entered by holding the button >3s after power-on.