Diodes Incorporated PT8A3516BPEX

Overview

PT8A3516BPEX from Pericom Semiconductor is a dedicated smart electric iron controller IC with integrated shunt regulator, sensor signal processor, RC oscillator, and 30s/15min timer. It detects iron orientation (horizontal/vertical) via external sensor input, drives relay and buzzer outputs, and supports 120V/240V AC systems using 60Hz ACCLK. Used in automatic shut-off safety circuits for household irons.

For engineers reviewing the PT8A3516BPEX datasheet, PT8A3516BPEX pinout, PT8A3516BPEX application, or PT8A3516BPEX equivalent, key selection criteria include vertical timeout duration (15 min), AC frequency support (60 Hz), relay drive capability (active-high, 5 mA sink), LED open-drain control, and low standby power (<1 W).

Technical Context

The PT8A3516BPEX implements a sensor-based safety logic system that interprets SW input level (high = horizontal) and ACCLK edge timing to determine iron position and motion state. Its internal 30s/15min timer uses 60Hz line frequency as reference, achieving ±1% timing accuracy without external crystal.

It integrates a 4.5–5.5 V on-chip shunt regulator for stable VCC supply, supports test mode activation via TEST pin (low), and delivers discrete output functions: RELAY (active-high), DISC/BUZ (4 kHz buzzer tone or capacitor discharge), and LED (open-drain, active-low pulse at ~1 Hz after timeout).

Key Specifications

Pinout & Package

PT8A3516BPEX is available in lead-free DIP-8 package (JEDEC MS-001D/BA), 9.0–9.4 mm width, 6.2–6.6 mm body length, 2.54 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3516APEX and PT8A3518BPEX, the PT8A3516BPEX uniquely balances 60 Hz compatibility with extended 15 min vertical safety window - making it optimal for North American full-size irons requiring longer safe-on duration under UL 1082 Clause 32.2.

Availability

PT8A3516BPEX is available at Aetrix Electronics and suitable for household iron safety control, AC mains-powered appliance timer modules, buzzer-enabled user alert systems, and low-power mains-derived control modules requiring stable component supply and long-lifecycle support.

Supply support for PT8A3516BPEX 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 applications.

The PT8A351x series belongs to Pericom's Smart Appliance Controller product line, engineered specifically for contactless, sensor-based thermal safety in electric irons - emphasizing reliability, AC-line synchronization, and minimal external component count.

FAQ

What is the function of the DISC/BUZ pin?

The DISC/BUZ pin serves dual roles: during standby, it discharges an external electrolytic capacitor to stabilize and limit its voltage; upon timeout, it outputs a 4 kHz square wave to drive a buzzer for audible alert. It operates as an active-high output for buzzer tone and relies on external pull-down for discharge functionality.

How does the PT8A3516BPEX detect iron orientation?

It uses the SW pin as a digital input: a high logic level indicates horizontal position, while low indicates vertical. This signal is processed by an internal sensor signal processor with hardware debounce and vibration immunity - eliminating need for external filtering or microcontroller-based interpretation.

Can the PT8A3516BPEX operate directly from rectified AC mains?

Yes - its on-chip shunt regulator accepts 4.5–5.5 V DC and tolerates input ripple typical of capacitive-drop or half-wave rectified supplies. When paired with recommended resistor-capacitor networks (e.g., R1=6.8K, C1=10 µF/100 V for 120 V), it derives stable VCC without transformer or switching regulator.

Is the TEST pin required for normal operation?

No - the TEST pin is optional and pulled high (via 10 kΩ) in standard operation. Only when driven low does it activate accelerated test mode (e.g., 15 min → 12 s), enabling rapid functional verification during manufacturing or lab validation without waiting for full timeout periods.