Diodes Incorporated PT8A3515AWE

Overview

PT8A3515AWE from Pericom Semiconductor is a dedicated CMOS smart iron controller IC with integrated shunt regulator, AC-line-synchronized timer (50Hz), 30s horizontal timeout, 8min vertical timeout, open-drain LED driver, active-high relay output, and 4kHz buzzer drive capability. It enables automatic power cutoff in electric irons based on position and motion sensing.

For engineers reviewing the PT8A3515AWE datasheet, PT8A3515AWE pinout, PT8A3515AWE application, or PT8A3515AWE equivalent, this device supports dual-voltage (120V/240V) systems, requires minimal external components, delivers <1W standby power, and integrates sensor signal processing with Schmitt-trigger ACCLK input for robust noise immunity.

Technical Context

The PT8A3515AWE uses 50Hz AC line frequency as its primary timing reference via the ACCLK pin with internal Schmitt-trigger input, enabling precise 30s horizontal and 8min vertical auto-shutoff without crystal or RC timing drift. Its sensor interface (SW pin) detects iron orientation by interpreting analog sensor voltage levels as digital high/low states.

On-chip blocks include a shunt regulator (4.5–5.5V output), logic control unit generating RELAY/LED/DISC/BUZ signals, power-on reset, and a built-in oscillator for sensor signal detection. The DISC/BUZ pin serves dual function: discharging electrolytic capacitors during startup and driving a buzzer at 4kHz upon timeout.

Key Specifications

Pinout & Package

PT8A3515AWE is packaged in lead-free, RoHS-compliant SOIC-8 (JEDEC MS-012E/AA), with body dimensions 4.7–5.1mm × 3.8–4.0mm × 1.35–1.75mm and 1.27mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3515BWE and PT8A3517AWE, the PT8A3515AWE uniquely combines 50Hz synchronization, 6-pulse buzzer alert, and SOIC-8 packaging - making it optimal for EU/UK/Asia-market irons requiring precise, audibly distinct timeout signaling.

Availability

PT8A3515AWE is available at Aetrix Electronics and suitable for electric iron auto-shutoff systems, universal voltage appliance control, and IEC 60335-1 safety-compliant heating devices requiring stable component supply and long-term lifecycle support.

Supply support for PT8A3515AWE 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 high-performance timing, interface, and power management solutions for consumer and industrial applications.

The PT8A351x series belongs to Pericom's Smart Iron Controller product line, designed specifically to replace electromechanical timers and discrete safety circuits in electric irons with a single, low-cost, fully integrated CMOS solution.

FAQ

What is the function of the TEST pin on PT8A3515AWE?

The TEST pin is an active-low input that enables accelerated functional verification. When pulled low, it scales down all timeout durations (e.g., 30s becomes 3s, 8min becomes 9.6s) while preserving timing ratios and output behavior. This allows rapid validation of relay cutoff, LED flashing, and buzzer activation without waiting full operational periods.

Can PT8A3515AWE operate directly from rectified AC mains?

Yes - the on-chip shunt regulator accepts unregulated DC derived from rectified 120V or 240V AC mains (via resistor-capacitor dropper or transformerless supply). It regulates VCC to 4.5–5.5V and tolerates input transients up to VCC +0.5V, enabling direct integration into compact, cost-sensitive iron power supplies.

How does the SW pin detect iron orientation?

The SW pin reads voltage from an external tilt sensor (e.g., mercury switch or MEMS accelerometer). A high logic level indicates horizontal orientation (triggering 30s timer); a low level indicates vertical orientation (triggering 8min timer). Internal hysteresis and filtering ensure reliable detection despite mechanical vibration during use.

Is PT8A3515AWE pin-compatible with other PT8A351x variants?

Yes - all PT8A351x variants (A/B suffixes, 14–19 numbers) share identical SOIC-8 and DIP-8 pinouts, electrical characteristics, and functional block architecture. Only timing behavior (vertical timeout duration, buzzer pattern) and ACCLK frequency support differ - allowing drop-in replacement within same voltage region.