Diodes Incorporated PT8A3517BWE

Overview

PT8A3517BWE from Pericom Semiconductor is a dedicated smart electric iron controller IC with integrated shunt regulator, AC-line-synchronized timer (60Hz), 8-minute vertical timeout, 30-second horizontal timeout, buzzer drive (4kHz), and open-drain LED output. It detects iron position via external sensor input (SW pin), drives relay and discharge/buzzer (DISC/BUZ), and operates across 120V/240V AC systems.

For engineers reviewing the PT8A3517BWE datasheet, PT8A3517BWE pinout, PT8A3517BWE application, or PT8A3517BWE equivalent, key selection criteria include AC clock compatibility (60Hz), vertical timeout duration (8 min), buzzer behavior (continual tone on timeout), relay drive capability (active-high, 5 mA sink), and SOIC-8 lead-free/Green packaging for thermal and safety-critical household appliance control.

Technical Context

The PT8A3517BWE uses AC line frequency (60Hz) as its primary timing reference, eliminating need for external crystal while achieving ±1% timer accuracy. Its internal shunt regulator maintains stable 5V operation from rectified AC supply, and sensor signal processor handles debounce and tilt-state discrimination between horizontal and vertical iron positions.

Logic control circuitry coordinates RELAY activation, DISC/BUZ pulsing (4kHz during timeout), and LED flashing (~1Hz post-timeout) using a built-in RC oscillator and power-on reset. The chip supports test mode via low-level TEST pin, enabling accelerated functional validation with scaled-down timeout durations (e.g., 9.6s instead of 8min).

Key Specifications

Pinout & Package

PT8A3517BWE is supplied in a lead-free and RoHS-compliant SOIC-8 package (JEDEC MS-012E/AA), measuring 4.7–5.1 mm × 3.8–4.0 mm × 1.35–1.75 mm, optimized for compact iron PCB layouts with thermal and creepage requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3517BWE, PT8A3515BWE offers reduced buzzer duration but identical safety timing, while PT8A3517AWE supports 50 Hz regions but cannot operate on 60 Hz lines-making each variant application-locked to regional AC infrastructure and acoustic requirements.

Availability

PT8A3517BWE is available at Aetrix Electronics and suitable for electric iron safety shutdown, AC-powered appliance timer, household appliance test mode, and low-power indicator control requiring stable component supply and long-term lifecycle support.

Supply support for PT8A3517BWE 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 electronics.

The PT8A351x series was developed specifically for intelligent electric iron control-integrating sensor interface, AC-synchronized timing, and safety-critical output drivers into a single low-cost CMOS IC.

FAQ

What AC line frequency does PT8A3517BWE support?

PT8A3517BWE is configured for 60 Hz AC line synchronization, as indicated by the "B" suffix in its part number. It accepts 60 Hz signals on the ACCLK pin to generate precise 8-minute and 30-second timeouts. Using it with 50 Hz will cause significant timing error and is not supported.

Can PT8A3517BWE drive a relay directly?

No-it provides an active-high RELAY output capable of sinking 5 mA, intended to drive the base of an external NPN transistor (e.g., 2N5551) that switches the relay coil. Direct relay connection is unsafe due to insufficient current and voltage rating; the recommended circuit uses Q1 as a current amplifier.

How does the TEST pin affect timing behavior?

When TEST is pulled low, PT8A3517BWE enters accelerated test mode: vertical timeout scales from 8 minutes to 9.6 seconds, and horizontal timeout scales from 30 seconds to 3 seconds. This enables rapid functional validation without waiting for full safety intervals during production testing.

Is PT8A3517BWE compliant with modern environmental standards?

Yes-PT8A3517BWE carries the "W" package code indicating lead-free and Green (halogen-free) construction per JEDEC and RoHS Directive 2011/65/EU. Its SOIC-8 body uses matte tin lead finish and complies with IPC/JEDEC J-STD-020 moisture sensitivity level MSL3.