Diodes Incorporated PT8A3518AWE

Overview

PT8A3518AWE from Pericom Semiconductor is a dedicated smart electric iron controller IC with integrated shunt regulator, AC-line-synchronized timer (50Hz), 15-minute vertical timeout, 30-second horizontal timeout, buzzer drive (4kHz), and open-drain LED control. It detects iron position via external sensor input and drives relay, buzzer, and status LED in 240V/50Hz systems.

For engineers reviewing the PT8A3518AWE datasheet, PT8A3518AWE pinout, PT8A3518AWE application, or PT8A3518AWE equivalent, this device supports safe thermal shutdown based on real-time orientation sensing, requires no external crystal, operates across 4.5–5.5V supply, and delivers <1W system standby power in recommended circuits.

Technical Context

The PT8A3518AWE uses AC 50Hz line frequency as its primary timing reference-eliminating need for precision oscillator-and implements dual-mode timeout logic: 30s for static horizontal position and 15min for static vertical position. Its sensor signal processor includes Schmitt-triggered SW input and noise-immune movement detection circuitry.

It integrates an on-chip shunt regulator (4.5–5.5V output), power-on reset, system oscillator, logic control block, and output drivers for RELAY (active-high, 5mA sink), DISC/BUZ (4kHz buzzer tone or capacitor discharge), and LED (open-drain, 10mA sink, 1Hz flash on timeout).

Key Specifications

Pinout & Package

PT8A3518AWE is available in lead-free, RoHS-compliant SOIC-8 package (JEDEC MS-012E/AA), measuring 4.7–5.1 mm × 3.8–4.0 mm × 1.35–1.75 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3516AWE and PT8A3518BWE, the PT8A3518AWE uniquely combines 50Hz synchronization, 15-minute vertical timeout, and continual buzzer output - making it optimal for 240V/50Hz iron designs requiring persistent audible warning on timeout.

Availability

PT8A3518AWE is available at Aetrix Electronics and suitable for electric iron safety shutdown, 240V/50Hz appliance control, and smart status indication requiring stable component supply and long-term lifecycle support.

Supply support for PT8A3518AWE 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, computing, and industrial applications.

The PT8A351x series belongs to Pericom's Smart Appliance Controller product line, engineered specifically for low-cost, high-reliability thermal safety control in electric irons using AC-line-derived timing and minimal external components.

FAQ

What is the function of the DISC/BUZ pin?

The DISC/BUZ pin serves two roles: it discharges external electrolytic capacitors to stabilize voltage during startup, and outputs a 4kHz square wave to drive a buzzer when the timer expires. It is active-high and capable of driving standard 20mm piezoelectric buzzers without external amplification.

Can PT8A3518AWE operate on 120V/60Hz systems?

No - PT8A3518AWE is configured for 50Hz AC clock input and optimized for 240V/50Hz applications. For 120V/60Hz systems, use PT8A3518BWE, which shares identical functionality but accepts 60Hz line frequency as its timing reference.

How does the SW pin detect iron orientation?

The SW pin receives a conditioned signal from an external mechanical or infrared sensor. A logic-high level indicates horizontal position; internal circuitry applies hysteresis and filtering to reject vibration noise and ensure reliable static/dynamic state discrimination without false triggers.

Is an external power supply regulator required?

No - the PT8A3518AWE integrates a shunt regulator that accepts raw rectified DC (typically 8–12V) and regulates it to 4.5–5.5V internally. This eliminates the need for an external LDO or switching regulator in typical iron power supply designs.