Diodes Incorporated PT8A3514CWE

Overview

PT8A3514CWE from Pericom Semiconductor is a dedicated smart iron controller IC integrating sensor signal processing, AC-line-synchronized timing (50Hz), 30s horizontal timeout, 10min vertical timeout, buzzer drive (4kHz), relay control, and open-drain LED indication in a single SOIC-8 package. It enables automatic power cutoff for electric irons based on position/movement detection and supports both 120V/60Hz and 240V/50Hz mains systems.

For engineers reviewing the PT8A3514CWE datasheet, PT8A3514CWE pinout, PT8A3514CWE application, or PT8A3514CWE equivalent, key selection criteria include AC clock input compatibility (50Hz), precise 10min/30s timeout thresholds, relay/LED/buzzer output drive capability, shunt-regulated VCC operation at 4.5–5.5V, and SOIC-8 thermal/mechanical suitability for compact iron PCB layouts.

Technical Context

The PT8A3514CWE implements a sensor-based safety architecture where SW input interprets iron orientation via external mechanical or infrared sensor signals, while ACCLK accepts 50Hz zero-crossing reference to achieve ±1% timer accuracy without crystal. Its internal shunt regulator stabilizes VCC from rectified mains-derived supply, eliminating need for external LDO.

Logic control integrates power-on reset, built-in RC oscillator for sensor sampling, and state machine-driven outputs: RELAY (active-high, 5mA sink), DISC/BUZ (4kHz buzzer tone or capacitor discharge), and LED (open-drain, 10mA sink with 1Hz flash on timeout). All I/O tolerates -0.5V to VCC+0.5V with defined input leakage (e.g., SW: -1μA max low current).

Key Specifications

Pinout & Package

PT8A3514CWE is housed in a 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 reflow soldering and high-density iron control boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3514CWE, PT8A3515CWE offers earlier vertical cutoff (8min vs. 10min) for compact designs, while PT8A3519CWE retains identical timing but modifies buzzer behavior - both maintain pin-for-pin compatibility and require no schematic changes.

Availability

PT8A3514CWE is available at Aetrix Electronics and suitable for electric iron auto-shutoff, smart appliance safety modules, and energy-efficient white-goods designs requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for PT8A3514CWE 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 analog and mixed-signal IC designer specializing in timing, interface, and power management solutions for consumer and industrial applications.

The PT8A351x series was developed specifically for intelligent electric iron safety control - integrating sensor interface, AC-synchronized timing, and multi-output drive into a single low-cost CMOS chip to replace discrete safety logic.

FAQ

What is the function of the ACCLK pin on PT8A3514CWE?

The ACCLK pin accepts a 50Hz zero-crossing signal derived from the mains input, serving as the timing reference for the internal 30s and 10min timers. It features Schmitt-trigger input architecture to reject noise and ensure stable edge detection, enabling ±1% timer accuracy without an external crystal or RC oscillator.

Can PT8A3514CWE operate directly from rectified 240VAC?

No - PT8A3514CWE requires a DC supply between 4.5V and 5.5V. In practice, it operates from a rectified and filtered mains-derived rail (e.g., via D1/R1/C1 in Figure 5), regulated internally by its on-chip shunt regulator. External components must limit current into VCC to avoid exceeding 500mW power dissipation.

How does the TEST pin affect timing behavior?

When TEST is pulled low, the PT8A3514CWE enters quick-test mode: 30s horizontal timeout becomes 3s, and 10min vertical timeout becomes 9.6s. This compressed timing enables rapid functional verification of relay cutoff, LED flashing, and buzzer activation without waiting for full-duration cycles during production testing.

Is the LED pin actively driven or open-drain?

The LED pin is open-drain with 10mA sink capability. During normal operation, it floats - allowing an external pull-up resistor to illuminate a common-anode LED. On timeout, it pulses low at ~1Hz to produce visible flashing. This architecture avoids sourcing current and simplifies interface with standard indicator LEDs.