Diodes Incorporated PT8A3519APEX

Overview

PT8A3519APEX from Pericom Semiconductor is a dedicated smart electric iron controller IC with integrated shunt regulator, AC-line-synchronized timer (50Hz), 30s horizontal timeout and 10min vertical timeout, open-drain LED driver, active-high relay output, and 4kHz buzzer drive capability - deployed in household iron safety control systems to prevent overheating.

For engineers reviewing the PT8A3519APEX datasheet, PT8A3519APEX pinout, PT8A3519APEX application, or PT8A3519APEX equivalent, key selection criteria include AC-clock frequency compatibility (50Hz), vertical/horizontal timeout configuration, relay/LED/buzzer interface logic levels, standby power (<1W), and DIP-8 lead-free packaging for through-hole assembly in high-reliability consumer appliance PCBs.

Technical Context

This IC implements a sensor-based safety architecture using an external tilt sensor input (SW pin) to distinguish horizontal (30s auto-shutoff) and vertical (10min auto-shutoff) iron positions. Timing accuracy is derived directly from 50Hz AC line frequency via the ACCLK pin with Schmitt-trigger input, eliminating need for crystal or RC timing components.

The on-chip shunt regulator maintains stable 5V operation across 4.5–5.5V VCC range while supporting <400µA quiescent current. Logic control integrates power-on reset, internal oscillator, sensor signal processor, and output drivers for RELAY (20mA sink), DISC/BUZ (20mA sink, 4kHz tone), and LED (10mA sink, open-drain).

Key Specifications

Pinout & Package

DIP-8 package (JEDEC MS-001D/BA compliant), lead-free, through-hole mountable. Body dimensions: 9.2mm × 6.4mm × 3.3mm (L×W×H), 2.54mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3515APEX and PT8A3519BPEX, PT8A3519APEX uniquely satisfies 50Hz-synchronized 10min vertical timeout requirements for European and Asian 240V iron platforms - making it non-substitutable where both frequency alignment and exact timeout duration are safety-critical.

Availability

PT8A3519APEX is available at Aetrix Electronics and suitable for electric iron safety control, appliance auto-shutoff systems, and energy-efficient standby management requiring stable component supply and long-lifecycle support.

Supply support for PT8A3519APEX 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 provider of high-performance interface, timing, and power management ICs for consumer, computing, and industrial markets.

PT8A3519APEX belongs to Pericom's Smart Iron Controller product line - designed specifically for cost-sensitive, safety-critical thermal management in mains-powered household irons with zero-microcontroller architecture.

FAQ

What is the function of the DISC/BUZ pin?

The DISC/BUZ pin serves dual purpose: it discharges external electrolytic capacitors to stabilize voltage during power-up, and outputs a 4kHz square wave to drive a buzzer when the timer expires. It operates as an active-high output with 20mA sink capability, and its behavior is determined by internal state - not user-configurable via software.

Can PT8A3519APEX operate with 60Hz AC line frequency?

No. PT8A3519APEX is factory-configured for 50Hz ACCLK input only, as indicated by the "A" suffix in its part number. Using it with 60Hz will cause timing errors exceeding ±1%, violating safety-critical timeout specifications. For 60Hz systems, PT8A3519BPEX must be used instead.

How does the SW pin detect iron orientation?

The SW pin accepts a digital-level signal from an external tilt sensor (e.g., mercury switch or MEMS accelerometer). A high logic level indicates horizontal orientation, triggering the 30s timeout; low indicates vertical orientation, enabling the 10min timeout. Internal hardware debouncing filters mechanical vibration to prevent false triggers.

Is an external crystal required for timing accuracy?

No. PT8A3519APEX uses the 50Hz AC line signal applied to the ACCLK pin as its primary timing reference. This eliminates need for external crystal, RC oscillator, or trimming components - delivering ±1% timer accuracy across temperature and voltage without calibration.