Diodes Incorporated PT8A3514BPEX

Overview

PT8A3514BPEX from Pericom Semiconductor is a dedicated CMOS smart iron controller IC with integrated shunt regulator, sensor signal processor, 30s/10min timer (horizontal/vertical timeout), AC-line-synchronized clock input (60Hz), and open-drain LED/buzzer/relay drivers. It enables automatic power cutoff for electric irons in static positions and supports 120V/240V mains systems.

For engineers reviewing the PT8A3514BPEX datasheet, PT8A3514BPEX pinout, PT8A3514BPEX application, or PT8A3514BPEX equivalent, key selection criteria include ACCLK frequency compatibility (60Hz), vertical timeout duration (10 minutes), buzzer behavior (continual tone on timeout), relay drive capability (active-high, 5V logic), and DIP-8 lead-free packaging.

Technical Context

The PT8A3514BPEX uses AC line frequency (60Hz) as its primary timing reference via the Schmitt-triggered ACCLK input, eliminating external crystal requirements. Its internal oscillator drives sensor signal detection and logic control, while the shunt regulator maintains stable VCC at 4.5–5.5V from unregulated input.

Position detection is performed through the SW input, interpreting high/low states as horizontal/vertical orientation. The logic control block generates time-out responses: 30s for horizontal static position and 10min for vertical static position, with DISC/BUZ output pulsing at 4kHz and RELAY deactivating heating elements upon timeout.

Key Specifications

Pinout & Package

DIP-8 package (JEDEC MS-001D/BA compliant), lead-free, 9.0–9.4 mm body width, 6.2–6.6 mm body length, 3.2–3.6 mm height. Pin 1 marked by notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3515BPEX and PT8A3517BPEX, the PT8A3514BPEX offers the longest vertical timeout (10 min) and uninterrupted buzzer feedback, making it optimal for full-size household irons requiring extended safe upright operation and clear user notification.

Availability

PT8A3514BPEX is available at Aetrix Electronics and suitable for electric iron safety shutdown, auto-off control modules, buzzer-alerted timeout systems, and universal mains-voltage iron controllers requiring stable component supply across global production programs.

Supply support for PT8A3514BPEX 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 ICs for consumer and industrial applications.

The PT8A351x series belongs to Pericom's Smart Iron Controller product line, designed specifically to replace electromechanical thermostats and discrete timer circuits in electric iron safety systems with single-chip, AC-synchronized intelligence.

FAQ

What is the function of the ACCLK pin on PT8A3514BPEX?

The ACCLK pin accepts a 60 Hz AC line signal (Schmitt-triggered) to serve as the primary timing reference for all internal timeouts. It eliminates the need for an external crystal or RC oscillator, enabling highly accurate 10-minute and 30-second delays directly synchronized to mains frequency. This ensures consistent timing across varying temperature and voltage conditions without calibration.

How does the PT8A3514BPEX detect iron orientation?

Orientation detection relies on the SW (Sensor Switch) input pin: a logic high indicates horizontal position (triggering 30s timeout), while logic low indicates vertical position (triggering 10min timeout). The internal sensor signal processor filters mechanical vibration and contact bounce, ensuring reliable detection without external debouncing circuitry.

Can the PT8A3514BPEX operate from 240V AC mains directly?

No - the PT8A3514BPEX requires a regulated 4.5–5.5 V DC supply derived from the mains via external components (e.g., resistor-capacitor dropper + shunt regulator). Application circuits in the datasheet show proven 240V/50Hz and 120V/60Hz implementations using D1, R1–R7, C1–C4, and Q1–Q2 to generate appropriate VCC and sensor biasing.

What is the purpose of the TEST pin?

The TEST pin enables accelerated functional verification: pulling it low scales all timeouts proportionally (e.g., 10-minute vertical timeout becomes 9.6 seconds). This allows rapid bench testing of safety logic without waiting for full-duration cycles, preserving development time while maintaining identical timing ratios and response behavior.