Diodes Incorporated PT8A3280PE

Overview

PT8A3280PE from Pericom Semiconductor is a mixed-signal CMOS heating controller IC designed for dual-voltage (120V/240V) AC-powered thermal appliances. It implements proportional temperature control using an external NTC sensor, features NTC open-circuit protection, internal 5V Zener regulation, and delivers 15mA SCR gate trigger pulses. It operates across –20°C to +85°C and is used in hair curlers and straighteners.

For engineers reviewing the PT8A3280PE datasheet, PT8A3280PE pinout, PT8A3280PE application, or PT8A3280PE equivalent, key selection criteria include NTC-based closed-loop thermal regulation, auto voltage-adaptive power control, 1-hour heating timer with 50/60Hz CLK synchronization, and DIP-8 package compatibility with discrete SCR drive circuits.

Technical Context

The PT8A3280PE integrates a 5-bit ADC for NTC voltage sampling, a state machine for heating-on/off control, and a clock-synchronized pulse generator for SCR triggering. Its internal logic detects NTC open condition via NTC1/NTC2 pin interaction and adjusts output duty based on both NTC voltage and CLK amplitude level (indicating line voltage).

It uses a fixed 216,000-clock-cycle heating timer - yielding ~1.0 hr at 60 Hz and ~1.2 hr at 50 Hz - and supports two LED indicators with programmable flash patterns (1/32 and 1/8 CLK frequency). The GATE output delivers 160–240 µs pulses capable of directly driving high-current SCRs up to 15 mA sink current.

Key Specifications

Pinout & Package

PT8A3280PE is housed in an 8-pin lead-free DIP package (JEDEC MS-001D/BA), with 0.3 inch body width, 2.54 mm pitch, and 9.0–9.4 mm length. Pin 1 is marked by notch or dot; pins are numbered left-to-right on top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3284WE and PT8A3281PE, the PT8A3280PE uniquely combines DIP-8 through-hole mounting, flash-mode LED1, and SCR-specific gate drive - making it optimal for cost-sensitive, manually assembled curler/straightener designs requiring visible pulsing status and robust discrete SCR interfacing.

Availability

PT8A3280PE is available at Aetrix Electronics and suitable for hair styling tools, electric blankets, and beauty appliance manufacturing requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for PT8A3280PE 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-performance interface, timing, and power management ICs for consumer and industrial applications before its 2016 acquisition.

The PT8A3280PE belongs to Pericom's dedicated heating controller product line, engineered specifically for thermally regulated personal care appliances with integrated safety, dual-voltage operation, and minimal external component count.

FAQ

What is the function of the NTC2 pin?

NTC2 is an open-drain output used exclusively for NTC open-circuit detection. When the NTC sensor disconnects, the IC pulls NTC2 low to signal fault condition; otherwise, it remains high-impedance. This pin does not carry analog measurement data and must be externally pulled up to VDD for proper operation.

Can PT8A3280PE drive a TRIAC directly?

No. PT8A3280PE is configured for SCR triggering only, with GATE output optimized for unidirectional gate drive and 15 mA sink capability. For TRIAC control, use PT8A3284WE or PT8A3285WE, which feature modified output stage timing and drive strength compatible with TRIAC gate requirements.

How does the IC determine whether the input is 120V or 240V?

The IC samples CLK input amplitude relative to internal thresholds. A high-amplitude CLK signal indicates 240V line voltage; a low-amplitude signal indicates 120V. This detection occurs automatically at power-up and adjusts proportional control gain to maintain consistent thermal output across both voltages.

Is an external crystal or RC oscillator required for timing?

No. The PT8A3280PE uses the AC line frequency (50/60 Hz) fed into the CLK pin as its sole timing reference. All internal functions - including heating timer, LED flash rates, and proportional control loop - are synchronized to this input, eliminating need for external timing components.