Diodes Incorporated PT8A3515APEX

Overview

PT8A3515APEX from Pericom Semiconductor is a dedicated smart electric iron controller IC with integrated shunt regulator, AC-line-synchronized timer (60Hz/50Hz selectable), movement/position detection logic, and dual-mode timeout protection (30s horizontal / 8min vertical). It drives relay, buzzer (4kHz), and LED outputs, supports 120V/240V systems, and operates within -10°C to +85°C.

For engineers reviewing the PT8A3515APEX datasheet, PT8A3515APEX pinout, PT8A3515APEX application, or PT8A3515APEX equivalent, key selection criteria include AC-frequency clock compatibility, open-drain LED drive capability, DISC/BUZ dual-function output timing, relay drive current (5mA sink), and DIP-8 lead-free packaging for thermal-safe iron control designs.

Technical Context

The PT8A3515APEX uses AC line frequency (60Hz) as its primary timing reference via Schmitt-triggered ACCLK input, enabling ±1% timer accuracy without external crystal. Its sensor signal processor interprets SW input polarity to distinguish horizontal vs. vertical iron orientation and detects motion through debounce-immune signal conditioning.

Internal blocks include a 4.5–5.5V shunt regulator, system oscillator for sensor sampling, 30s/8min timer with test mode scaling (3s/9.6s), logic control for RELAY (active-high, 0.7mA source), and DISC/BUZ (4kHz buzzer drive or capacitor discharge).

Key Specifications

Pinout & Package

DIP-8 package (JEDEC MS-001D/BA compliant), lead-free, 0.3" wide body. Pin 1 marked by notch or dot; pins spaced 2.54mm (0.1") pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3515APEX, PT8A3515BPEX supports 60Hz-only operation and requires matching AC input, while PT8A3517APEX retains 50Hz compatibility but changes buzzer output behavior-both maintain identical safety timing and relay drive specs.

Availability

PT8A3515APEX is available at Aetrix Electronics and suitable for electric iron auto-shutoff, thermal safety controller, and energy-efficient appliance control requiring stable component supply, long-lifecycle availability, and lead-free compliance.

Supply support for PT8A3515APEX 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, designed specifically for cost-sensitive, safety-critical thermal appliances requiring hardware-enforced timeout without software intervention.

FAQ

What is the function of the DISC/BUZ pin?

The DISC/BUZ pin serves two roles: it discharges external electrolytic capacitors to stabilize voltage during power-up, and outputs a 4kHz square wave to drive a buzzer when the timer expires. It is active-high, capable of sourcing up to 20mA, and shares functionality with the capacitor discharge path-requiring careful PCB layout to avoid coupling noise into timing circuits.

Can PT8A3515APEX operate on both 120V and 240V mains?

Yes-PT8A3515APEX itself operates from 4.5–5.5V DC, derived from a rectified and filtered AC supply. The application circuits provided support both 120V/60Hz and 240V/50Hz inputs via different resistor networks (e.g., R1=6.8kΩ for 120V, R1=12kΩ for 240V), while the IC's ACCLK input accepts either frequency depending on suffix (A=50Hz, B=60Hz).

How does the TEST pin affect timer behavior?

When TEST is pulled low, the internal timer scales down to 1/10 real-time: 30s becomes 3s, and 8min becomes 9.6s. This allows rapid functional validation without waiting full timeout durations. The scaling applies uniformly across all timing functions-including LED flash rate and buzzer pulse count-preserving relative timing relationships.

Is an external crystal required for accurate timing?

No-PT8A3515APEX uses the AC line frequency (60Hz for 'B' variants, 50Hz for 'A') as its timing reference via the ACCLK pin. This eliminates the need for an external crystal or precision RC network, achieving ±1% accuracy while reducing component count, cost, and board space in iron control applications.