Diodes Incorporated PT8A3515BPE

Overview

PT8A3515BPE from Pericom Semiconductor is a dedicated smart electric iron controller IC with integrated shunt regulator, AC-line-synchronized timer (60Hz), 30s horizontal timeout and 8min vertical timeout, open-drain LED driver, active-high relay output, and buzzer tone generation at 4kHz. It operates from 4.5–5.5V supply and supports 120V/240V mains systems via external sensor and relay interface.

For engineers reviewing the PT8A3515BPE datasheet, PT8A3515BPE pinout, PT8A3515BPE application, or PT8A3515BPE equivalent, key selection criteria include AC-clock-based timing accuracy (±1%), low standby power (<1W system-level), dual-position detection logic, and DIP-8 lead-free packaging compatible with iron safety certification requirements.

Technical Context

The PT8A3515BPE uses 60Hz AC line frequency as its primary timing reference via Schmitt-triggered ACCLK input, enabling precise 8-minute vertical and 30-second horizontal timeout without crystal or RC timing drift. Its internal logic interprets SW pin voltage level to distinguish iron orientation and triggers DISC/BUZ (4kHz) and RELAY outputs accordingly.

It integrates a 5V shunt regulator for internal supply stabilization, sensor signal processor with vibration immunity, power-on reset, and system oscillator - all in a single CMOS die. The LED pin operates in open-drain mode with ~1Hz flash during timeout, while TEST pin enables factory functional verification with scaled-down timing (9.6s instead of 8min).

Key Specifications

Pinout & Package

DIP-8 (lead-free, JEDEC MS-001D/BA compliant) with 2.54mm pitch; body dimensions 9.0–9.4mm × 6.2–6.6mm × 3.2–3.6mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3515APE and PT8A3517BPE, the PT8A3515BPE uniquely balances regional AC frequency alignment (60Hz), standardized 8-minute safety cutoff, and pulse-mode buzzer signaling - making it optimal for North American iron designs requiring UL/CSA-compliant auto-shutoff behavior.

Availability

PT8A3515BPE is available at Aetrix Electronics and suitable for electric iron safety control, auto-shutoff appliance modules, and 120V dual-voltage consumer electronics requiring stable component supply across long production lifecycles.

Supply support for PT8A3515BPE 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, focused on signal integrity and system-level integration for consumer and industrial applications.

The PT8A351x series belongs to Pericom's Smart Appliance Controller product line, engineered specifically for contactless, low-cost, and certification-ready thermal safety management in electric irons and similar handheld heating appliances.

FAQ

What is the function of the DISC/BUZ pin?

The DISC/BUZ pin serves dual roles: it discharges an external electrolytic capacitor to stabilize voltage during startup, and outputs a 4kHz square wave to drive a buzzer when the internal timer expires. It operates as an active-high output, with timing behavior dependent on the specific variant (e.g., PT8A3515B triggers 6-pulse buzzer output). No external pull-up is required for buzzer operation.

How does the PT8A3515BPE detect iron orientation?

Orientation detection relies on an external mechanical or infrared sensor connected to the SW pin. A high logic level on SW indicates horizontal position (triggering 30s timeout), while a low level indicates vertical orientation (activating 8min timeout). The internal sensor signal processor includes digital filtering to reject vibration-induced noise, ensuring reliable detection without false triggers.

Can the PT8A3515BPE operate directly from 120V AC?

No - the PT8A3515BPE requires a regulated 4.5–5.5V DC supply derived from the mains via external circuitry (e.g., capacitive dropper + shunt regulator or transformer + rectifier). Its VCC pin accepts only low-voltage DC; the ACCLK pin accepts 60Hz AC but at logic-compatible amplitude after conditioning - direct 120V AC connection would destroy the device.

Is the TEST pin required for normal operation?

No - the TEST pin is optional and inactive during standard operation. It must be pulled high (e.g., via 10kΩ to VCC) to disable test mode. When pulled low, it activates scaled-down timing (e.g., 8min → 9.6s) and modifies buzzer/LED behavior for rapid functional verification during production testing or debug.