Diodes Incorporated PT8A3518APE

Overview

PT8A3518APE from Pericom Semiconductor is a dedicated smart electric iron controller IC with integrated shunt regulator, sensor signal processor, AC-line-synchronized timer, and relay/LED/buzzer drivers. It detects iron orientation (horizontal/vertical) via external sensor input, enforces 30s timeout in horizontal position and 15min timeout in vertical position, and supports both 50Hz (A-suffix) and 120V/240V global mains systems. Used in safety-critical household iron control circuits.

For engineers reviewing the PT8A3518APE datasheet, PT8A3518APE pinout, PT8A3518APE application, or PT8A3518APE equivalent, key selection criteria include AC-frequency selection (50Hz), vertical timeout duration (15min), buzzer output behavior (continual 4kHz tone after timeout), open-drain LED drive capability, and DIP-8 lead-free packaging for through-hole assembly.

Technical Context

The PT8A3518APE uses AC line frequency (50Hz) as its primary timing reference, eliminating need for external crystal while achieving ±1% timer accuracy. Its sensor interface employs Schmitt-triggered SW input and internal debounce logic to distinguish static orientation and movement-critical for reliable iron position detection under mechanical vibration.

On-chip shunt regulator maintains stable 5V operation across 4.5–5.5V VCC range, powering internal blocks including 30s/15min timer, logic control, power-on reset, and output drivers (RELAY, DISC/BUZ, LED). All outputs are CMOS-compatible with defined sink/source current specs and active-high or open-drain configurations per function.

Key Specifications

Pinout & Package

DIP-8 package (JEDEC MS-001D/BA compliant), lead-free, through-hole mountable. 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 appliance timer control applications.

Compared with PT8A3516APE and PT8A3519APE, the PT8A3518APE uniquely delivers 15min vertical timeout with continual 4kHz buzzer output - optimizing for markets prioritizing extended safe usage time and persistent alerting without pulse-counting logic.

Availability

PT8A3518APE is available at Aetrix Electronics and suitable for electric iron safety shutdown, household appliance timer control, energy-efficient standby mode, and appliance status feedback systems requiring stable component supply and long-term industrial availability.

Supply support for PT8A3518APE 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 interface, timing, and power management solutions for consumer and industrial electronics.

The PT8A351x series belongs to Pericom's Smart Appliance Controller product line, designed specifically for cost-sensitive, safety-critical thermal management in electric irons and similar resistive-heating appliances.

FAQ

What is the function of the ACCLK pin on PT8A3518APE?

The ACCLK pin accepts 50Hz AC line voltage (via resistor divider) as a precision timing reference. Internally conditioned with Schmitt trigger and pull-down, it synchronizes the 15min vertical and 30s horizontal timers to mains frequency - eliminating need for external crystal and ensuring ±1% accuracy without calibration.

How does the PT8A3518APE detect iron orientation?

Orientation detection relies on the SW (sensor) input pin. When the iron's mechanical tilt sensor closes a switch or changes resistance, it pulls SW high (horizontal) or low (vertical). The IC's internal sensor signal processor applies adaptive debounce and state logic to distinguish static orientation from movement - triggering appropriate timeout actions.

Can the PT8A3518APE operate directly from 240VAC?

No - PT8A3518APE requires 4.5–5.5V DC supply. In 240VAC systems, a resistor-capacitor dropper network (e.g., 12kΩ + 10µF/100V) and bridge rectifier generate the required low-current 5V rail. The on-chip shunt regulator stabilizes this input, enabling robust operation without transformer-based supplies.

What is the purpose of the TEST pin?

The TEST pin enables fast functional verification: pulling it low at power-up reduces all timeouts proportionally (e.g., 30s → 3s, 15min → 9.6s). This allows rapid bench validation of relay actuation, buzzer tone, and LED flash behavior without waiting full operational durations - critical for production line testing and design debug.