Diodes Incorporated PT8A3517BPEX

Overview

PT8A3517BPEX from Pericom Semiconductor is a dedicated smart electric iron controller IC with integrated shunt regulator, AC-line-synchronized timer (60Hz), 30s horizontal timeout and 8min vertical timeout, open-drain LED driver, active-high relay output, and buzzer tone generation at 4kHz. It enables automatic power cutoff in static positions for household irons operating on 120V/60Hz systems.

For engineers reviewing the PT8A3517BPEX datasheet, PT8A3517BPEX pinout, PT8A3517BPEX application, or PT8A3517BPEX equivalent, key selection criteria include AC clock synchronization capability, dual-position timeout logic, low-power standby (<1W), DIP-8 package compatibility, and sensor-based movement detection architecture.

Technical Context

This IC implements a system-on-chip solution for thermal safety control in electric irons, using AC line frequency (60Hz) as the primary timing reference via the ACCLK input with Schmitt-triggered input stage. Its internal oscillator drives sensor signal processing and logic control without external crystal.

The chip integrates a 4.5–5.5V shunt-regulated power supply, position-discriminating sensor interface (SW pin), and dual-mode timeout logic: 30s for horizontal static detection and 8min for vertical static detection. Output drivers support relay switching (active-high), buzzer excitation (4kHz, continual after timeout), and LED status indication (open-drain, 1Hz flash post-timeout).

Key Specifications

Pinout & Package

DIP-8 package per JEDEC MS-001D/BA; lead-free (P suffix), RoHS-compliant, through-hole mountable.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar smart appliance timer applications.

Compared with PT8A3515BPEX and PT8A3518BPEX, PT8A3517BPEX offers the optimal balance of rapid vertical response (8min) and persistent audible alert (continual 4kHz tone), making it ideal for North American 120V/60Hz iron designs prioritizing immediate user notification and moderate hold time.

Availability

PT8A3517BPEX is available at Aetrix Electronics and suitable for household electric iron safety control, AC-mains-powered appliance timer modules, and smart movement-detection subsystems requiring stable component supply and long-lifecycle support.

Supply support for PT8A3517BPEX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Pericom Semiconductor (now part of Diodes Incorporated) is a fabless semiconductor company specializing in timing, interface, and power management solutions for consumer and industrial electronics.

PT8A3517BPEX belongs to the PT8A351x Smart Iron Controller family, designed specifically to replace electromechanical thermostats and discrete timer circuits in electric irons with integrated, AC-synchronized, low-power safety logic.

FAQ

What is the function of the ACCLK pin?

The ACCLK pin accepts a 60Hz AC signal from the mains via a resistive divider and serves as the primary timing reference for all internal timeouts. It features a Schmitt-trigger input for noise immunity and directly synchronizes the 30s horizontal and 8min vertical timers-eliminating drift associated with RC oscillators.

How does the SW pin detect iron position?

The SW pin reads the output of an external tilt sensor (e.g., mercury switch or ball switch). A high logic level indicates horizontal orientation; low indicates vertical. Internal signal conditioning rejects mechanical vibration noise, ensuring reliable position discrimination without false triggers during normal use.

Can PT8A3517BPEX operate on 240V/50Hz systems?

No. PT8A3517BPEX is specifically configured for 60Hz operation (denoted by "B" in the part number). For 240V/50Hz systems, PT8A3517APEX ("A" variant) must be used-it provides identical functionality but uses 50Hz ACCLK input and matches corresponding timeout values.

What is the purpose of the TEST pin?

The TEST pin enables a diagnostic mode when pulled low: timeout durations scale down proportionally (e.g., 30s becomes 3s, 8min becomes 9.6s), allowing rapid functional verification during manufacturing test or field service without waiting for full operational periods.