Diodes Incorporated PT8A3516BPE

Overview

PT8A3516BPE from Pericom Semiconductor is a dedicated smart electric iron controller IC with integrated shunt regulator, sensor signal processor, RC oscillator, and AC-line-synchronized timer. It detects iron orientation (horizontal/vertical) via external sensor input, enforces 30s timeout in horizontal position and 15min timeout in vertical position, drives relay and buzzer outputs, and operates across 120V/240V AC systems using 60Hz line frequency.

For engineers reviewing the PT8A3516BPE datasheet, PT8A3516BPE pinout, PT8A3516BPE application, or PT8A3516BPE equivalent, key selection criteria include ACCLK-synchronized timing accuracy (±1%), open-drain LED control, DISC/BUZ dual-function output, relay drive capability, and DIP-8 lead-free packaging for thermal-safe iron PCB layouts.

Technical Context

The PT8A3516BPE uses 60Hz AC line voltage (applied to ACCLK pin) as its primary timing reference, eliminating need for external crystal while achieving ±1% timer accuracy. Its sensor interface (SW pin) interprets analog tilt status as digital high/low, feeding into logic-controlled state machine that distinguishes static horizontal vs. vertical orientation.

Internal blocks include a 4.5–5.5V shunt regulator (VCC), power-on reset circuit, and system oscillator for sensor signal detection. The DISC/BUZ pin provides active-high 4kHz buzzer drive on timeout and active-high capacitor discharge control; RELAY pin delivers active-high 5mA sink/source drive for external relay coil control.

Key Specifications

Pinout & Package

PT8A3516BPE is supplied in Pb-free DIP-8 package (JEDEC MS-001D/BA compliant), with 0.3" wide body, 2.54mm pitch, and 9.0–9.4mm length. Pin 1 (DISC/BUZ) is marked by notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3516APE and PT8A3518BPE, the PT8A3516BPE uniquely balances extended vertical safety (15min) with 60Hz line synchronization for North American and Japanese markets, while retaining identical DIP-8 footprint and relay/LED/buzzer interface compatibility.

Availability

PT8A3516BPE is available at Aetrix Electronics and suitable for electric iron safety controllers, AC-powered small appliance timers, and line-frequency-synchronized embedded shutdown systems requiring stable component supply and long-lifecycle support.

Supply support for PT8A3516BPE 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) specialized in high-reliability timing, interface, and power management ICs for consumer and industrial applications before acquisition in 2016.

The PT8A351x series was designed specifically for intelligent electric iron safety control - integrating sensor interface, AC-synchronized timing, and relay/buzzer drivers into a single low-cost CMOS chip for global appliance manufacturers.

FAQ

What is the function of the TEST pin on PT8A3516BPE?

The TEST pin is an active-low input that enables accelerated functional verification mode. When pulled low, it scales down all timeouts proportionally - e.g., 30s horizontal timeout becomes 3s, and 15min vertical timeout becomes 12s - allowing rapid validation without waiting for full-duration cycles.

Can PT8A3516BPE operate directly from rectified AC without external regulator?

Yes - the IC integrates an on-chip shunt regulator that accepts unregulated DC derived from AC mains (via bridge rectifier and smoothing capacitor), regulating VCC to 4.5–5.5V. External resistor-capacitor networks set the regulated voltage level per application circuit guidelines.

How does the SW pin detect iron orientation?

The SW pin reads a binary signal from an external mechanical or infrared tilt sensor. A high logic level indicates horizontal position (triggering 30s timeout), while low indicates vertical position (enabling 15min timeout). Internal debounce logic rejects vibration-induced false transitions.

Is PT8A3516BPE compatible with both 120V and 240V AC input systems?

Yes - the device itself operates from its internal 5V rail, but the supporting application circuit (resistor divider, rectifier, capacitor sizing) is configured differently for 120V/60Hz versus 240V/50Hz. The PT8A3516BPE variant is specifically optimized for 120V/60Hz mains with corresponding timing behavior.