Diodes Incorporated PT8A3514AWEX

Overview

PT8A3514AWEX from Pericom Semiconductor is a dedicated smart electric iron controller IC with integrated shunt regulator, sensor signal processor, RC oscillator, and programmable 30s/8min/10min/15min timer. It detects iron orientation (horizontal/vertical) via external sensor input, drives relay and buzzer outputs, and supports both 50Hz and 60Hz AC line-synchronized timing. Used in safety-critical household iron auto-shutoff systems.

For engineers reviewing the PT8A3514AWEX datasheet, PT8A3514AWEX pinout, PT8A3514AWEX application, or PT8A3514AWEX equivalent, key selection criteria include AC-line-referenced timer accuracy (±1%), open-drain LED output behavior, DISC/BUZ dual-function terminal operation, and DIP-8/SOIC-8 package compatibility with thermal and layout constraints in mains-connected appliances.

Technical Context

The PT8A3514AWEX implements a sensor-based safety control architecture where SW pin interprets iron tilt status (high = horizontal), while ACCLK accepts 50Hz or 60Hz zero-crossing signals for line-synchronized timing-eliminating crystal dependency. Its internal shunt regulator maintains stable 5V operation across 4.5–5.5V VCC range.

Timer logic triggers RELAY deactivation after 30s (horizontal) or 10min (vertical, per A/B variant), with DISC/BUZ output generating 4kHz tone bursts on timeout. LED pin operates open-drain with active-low sinking (10mA sink capability) to drive indicator LEDs directly.

Key Specifications

Pinout & Package

PT8A3514AWEX is available in lead-free, RoHS-compliant SOIC-8 package (JEDEC MS-012E/AA), measuring 4.7–5.1mm × 3.8–4.0mm × 1.35–1.75mm, suitable for compact PCB layouts in double-sided iron control modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3514AWEX, PT8A3515AWEX offers tighter vertical timing and segmented audio feedback, while PT8A3516AWEX extends vertical hold time-both retain identical sensor interface, relay drive, and ACCLK synchronization, enabling drop-in replacement with only firmware-adjacent configuration changes.

Availability

PT8A3514AWEX is available at Aetrix Electronics and suitable for electric iron auto-shutoff systems, thermal safety controllers, and appliance-level timeout management requiring stable component supply and long-lifecycle support.

Supply support for PT8A3514AWEX 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) specialized in high-reliability interface, timing, and power management ICs for consumer and industrial applications.

The PT8A351x series was designed specifically for intelligent, sensor-driven safety control in mains-powered household appliances-emphasizing AC-line-referenced timing, low external component count, and robust noise immunity in electromechanically noisy environments.

FAQ

What is the function of the DISC/BUZ pin?

The DISC/BUZ pin serves two roles: it actively discharges an external electrolytic capacitor to stabilize voltage during power-up, and outputs a 4kHz square wave to drive a buzzer when the internal timer expires. Its active-high behavior means it sources current during buzzer tone generation and sinks current during capacitor discharge-requiring appropriate external pull-down or series resistor per application schematics.

How does the PT8A3514AWEX detect iron orientation?

Orientation detection relies on the SW (Sensor) input pin. An external mechanical or MEMS tilt sensor pulls SW high for horizontal position and low for vertical. The IC's internal sensor signal processor filters bounce and validates sustained state before initiating corresponding timeout logic-30s for horizontal, 10min for vertical-ensuring reliable, noise-immune detection without microcontroller intervention.

Can the PT8A3514AWEX operate directly from 240VAC?

No-it requires a stepped-down, rectified, and filtered DC supply between 4.5V and 5.5V. Application circuits show transformerless capacitive dropper networks (e.g., 12kΩ + 10µF/100V) feeding an internal shunt regulator. Direct 240VAC connection would destroy the IC; proper isolation, voltage reduction, and ripple suppression must be implemented externally per Figures 5–8.

Is the TEST pin required for normal operation?

No-the TEST pin is optional and pulled high (via resistor or open) during normal use. Only pulling it low enters accelerated test mode, scaling all timeouts (e.g., 10min → 9.6s). Leaving it unconnected or tied to VCC ensures standard timing behavior. No external components are needed unless production testing mandates fast validation cycles.