Diodes Incorporated PT8A3516APE

Overview

PT8A3516APE from Pericom Semiconductor is a dedicated smart electric iron controller IC with integrated shunt regulator, sensor signal processor, RC oscillator, and programmable 30s/15min timer. It detects iron orientation (horizontal/vertical) via external sensor input, drives relay and buzzer outputs, supports 50Hz AC clock input, and operates across 120V/240V mains systems in DIP-8 package.

For engineers reviewing the PT8A3516APE datasheet, PT8A3516APE pinout, PT8A3516APE application, or PT8A3516APE equivalent, this device delivers precise timeout control for safety-critical household appliance thermal management with minimal external components and <1W standby power.

Technical Context

The PT8A3516APE implements a sensor-based logic control architecture that interprets SW pin voltage level to determine iron orientation and triggers fixed-duration timers-30 seconds for horizontal static position and 15 minutes for vertical static position-using AC line frequency (50Hz) as the timing reference. Its internal shunt regulator maintains stable 5V operation from unregulated input.

It features Schmitt-triggered ACCLK input for noise-immune 50Hz synchronization, open-drain LED output with 1Hz flash on timeout, and DISC/BUZ pin capable of sourcing 4kHz buzzer drive or discharging electrolytic capacitors. All logic and timing functions are fully self-contained without external crystal or RC timing networks.

Key Specifications

Pinout & Package

DIP-8 package (JEDEC MS-001D/BA compliant), lead-free, through-hole mount. Dimensions: 9.2 mm × 6.4 mm × 3.4 mm (L×W×H), 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 PT8A3516BPE and PT8A3519APE, the PT8A3516APE uniquely combines 50Hz line synchronization, 15-minute vertical timeout, and continual buzzer output-making it optimal for European 240V/50Hz irons requiring extended safe-standing duration and persistent audible alert.

Availability

PT8A3516APE is available at Aetrix Electronics and suitable for electric iron safety shutdown, thermal management systems, appliance energy compliance, and manufacturing test & validation requiring stable component supply and long-term lifecycle support.

Supply support for PT8A3516APE 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-performance interface, timing, and power management ICs for consumer and industrial applications before acquisition in 2016.

The PT8A351x series belongs to Pericom's Smart Appliance Controller product line, engineered specifically for automatic thermal cutoff in electric irons using AC-line-referenced timing and mechanical orientation sensing.

FAQ

What is the function of the DISC/BUZ pin on PT8A3516APE?

The DISC/BUZ pin serves dual roles: it discharges external electrolytic capacitors to limit voltage spikes during relay switching, and outputs a 4kHz square wave to drive a buzzer when the internal timer expires. It operates as an open-drain output with active-high buzzer drive and active-high discharge control, requiring an external pull-up resistor for proper logic level definition.

How does PT8A3516APE detect iron orientation?

PT8A3516APE detects orientation via the SW pin: a logic-high input indicates horizontal placement (triggering 30s timeout), while logic-low indicates vertical placement (triggering 15min timeout). This signal originates from an external tilt sensor circuit-typically a mercury switch or MEMS accelerometer-with level-shifting to meet the IC's input voltage thresholds.

Can PT8A3516APE operate directly from 240V AC?

No. PT8A3516APE requires a regulated 5V DC supply. In 240V AC systems, it is powered through a resistive-capacitive dropper network followed by rectification, filtering, and internal shunt regulation. The datasheet recommends specific resistor/capacitor values (e.g., R1=12kΩ, C1=10µF/100V) to deliver stable VCC under load.

Is PT8A3516APE pin-compatible with other PT8A351x variants?

Yes-PT8A3516APE shares identical DIP-8 pinout and electrical characteristics with all PT8A351xA/B variants (e.g., PT8A3514APE, PT8A3515APE). Differences are limited to internal timer configuration (8/10/15min) and buzzer behavior (continual vs. 6-pulse), which are factory-programmed and not user-modifiable.