Diodes Incorporated PT8A3519BPEX

Overview

PT8A3519BPEX from Pericom Semiconductor is a dedicated smart electric iron controller IC with integrated shunt regulator, AC-line-synchronized timer (60Hz), 30s horizontal timeout and 10min 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 safety compliance in household iron applications.

For engineers reviewing the PT8A3519BPEX datasheet, PT8A3519BPEX pinout, PT8A3519BPEX application, or PT8A3519BPEX equivalent, this device supports dual-voltage (120V/240V) systems, offers test mode activation via TEST pin, delivers <1W standby power dissipation, and integrates sensor signal processing for movement/position detection without external microcontroller.

Technical Context

The PT8A3519BPEX uses AC 60Hz line frequency as its primary timing reference, eliminating need for crystal oscillator. Its internal logic interprets SW pin voltage level to distinguish horizontal (high) vs. vertical (low) iron orientation, triggering respective 30s or 10min timeouts.

It features a built-in shunt regulator (4.5–5.5V output), Schmitt-triggered ACCLK input for noise-immune line synchronization, and dual-output capability: RELAY (active-high, 5mA sink) for heater control and DISC/BUZ (4kHz square wave during timeout) for audible alert generation.

Key Specifications

Pinout & Package

PT8A3519BPEX is supplied in lead-free DIP-8 package (JEDEC MS-001D/BA compliant), with 0.3" wide body and 2.54mm pitch. Pin 1 is marked by notch or dot; pin numbering follows standard counter-clockwise layout from top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar smart iron controller applications.

Compared with PT8A3519APEX, the PT8A3519BPEX provides 60Hz timing compatibility for North American markets, while PT8A3515BPEX offers reduced vertical timeout duration - enabling precise regional and safety-tier selection without redesigning the control logic or external circuitry.

Availability

PT8A3519BPEX is available at Aetrix Electronics and suitable for automatic shut-off irons, dual-voltage appliance controllers, and energy-compliant household electronics requiring stable component supply and long-term lifecycle support.

Supply support for PT8A3519BPEX 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 interface, timing, and power management solutions for consumer and industrial electronics.

The PT8A351x series belongs to Pericom's Smart Appliance Controller product line, designed specifically for electromechanical safety-critical functions in household appliances - integrating sensor interface, precision timing, and actuator drive in a single low-cost CMOS IC.

FAQ

What is the function of the DISC/BUZ pin?

The DISC/BUZ pin serves two roles: during power-up, it discharges an external electrolytic capacitor to stabilize voltage; during timeout, it outputs a 4kHz square wave to drive a buzzer directly. It operates as an open-drain output with active-high buzzer signal, eliminating need for external driver transistors or oscillators.

How does the PT8A3519BPEX detect iron orientation?

Orientation detection relies on the SW pin: a high logic level indicates horizontal position (e.g., iron lying flat), triggering the 30s timeout; a low level indicates vertical position (e.g., iron in stand), activating the 10min timeout. The internal sensor signal processor handles debouncing and noise immunity without external components.

Can the PT8A3519BPEX operate with both 120V and 240V AC supplies?

Yes - the IC itself operates from a regulated 4.5–5.5V supply generated internally via its shunt regulator. External application circuits (e.g., Figure 5 and 6 in datasheet) provide appropriate resistive divider and rectification networks for either 120V/60Hz or 240V/50Hz inputs, making the IC agnostic to mains voltage.

What is the purpose of the TEST pin?

The TEST pin enables accelerated functional verification: pulling it low reduces all timeout durations by a fixed ratio (e.g., 10min → 9.6s), allowing rapid validation of relay actuation, LED flashing, and buzzer output without waiting full operational periods - critical for production line testing and field service diagnostics.