Diodes Incorporated PT8A3283PEX

Overview

PT8A3283PEX from Pericom Semiconductor is a mixed-signal CMOS heating controller IC designed for dual-voltage (120V/240V) hair styling appliances. It implements proportional temperature control using an external NTC sensor, features NTC open-circuit protection, auto power-off after 1.15–1.25 hour timer timeout, and drives SCR loads via 160–240 µs gate trigger pulses. Used in curlers and straighteners.

For engineers reviewing the PT8A3283PEX datasheet, PT8A3283PEX pinout, PT8A3283PEX application, or PT8A3283PEX equivalent, key selection criteria include SCR-compatible gate drive capability, 50/60 Hz line-synchronized clock input, NTC-based closed-loop thermal regulation, and lead-free DIP-8 packaging with integrated Zener (4.5–5.5 V) and POR (1.5–2.5 V).

Technical Context

The PT8A3283PEX integrates a 5-bit ADC for NTC voltage sampling, internal clock synchronization to AC line frequency (50/60 Hz), and state-machine-based heating control logic. Its proportional output adjusts SCR conduction angle based on real-time NTC voltage and detected line voltage level (120V vs 240V), enabling automatic power scaling without external microcontroller intervention.

It operates across -20°C to +85°C with supply voltage 3.5–5.5 V, delivers 5 mA sink current on GATE pin, supports 20 mA total I/O drive, and includes hardware-level NTC open detection that pulls NTC1 low during fault condition - all implemented in a single-chip solution without external timing components.

Key Specifications

Pinout & Package

PT8A3283PEX is supplied in a lead-free 8-pin PDIP package (JEDEC MS-001D/BA), 9.0–9.4 mm wide, 6.2–6.6 mm body width, 3.71–4.31 mm height, with 2.54 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3280PEX and PT8A3282PEX, PT8A3283PEX uniquely combines constant LED output with built-in 1.2-hour safety timer - making it optimal for cost-sensitive, self-contained curlers and straighteners requiring both visual feedback and autonomous thermal shutdown.

Availability

PT8A3283PEX is available at Aetrix Electronics and suitable for hair styling tools, portable thermal appliances, and low-cost consumer heating devices requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for PT8A3283PEX 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 PT8A328x series was developed specifically for thermal control in personal care appliances, integrating analog sensing, digital timing, and power switching in minimal footprint to replace discrete solutions.

FAQ

What is the maximum load current the PT8A3283PEX can directly drive?

The PT8A3283PEX does not drive load current directly. Its GATE pin delivers a 160–240 µs trigger pulse with 5 mA sink capability, intended to drive the gate of an external SCR (e.g., BT169, MCR100). Load current handling depends entirely on the selected SCR's rating - typically up to 4 A RMS for common TO-92 SCRs used in curlers.

Can the heating timer duration be adjusted or disabled?

No. The 1.15–1.25 hour timer is hardwired into the silicon and cannot be modified via pins, registers, or external components. It resets automatically upon power cycle or NTC open fault. For variable timing, an external microcontroller or programmable timer IC must be added - which negates the single-chip advantage of this device.

Does PT8A3283PEX support TRIAC-based loads?

No. PT8A3283PEX is configured for SCR triggering only, as confirmed by the Function Comparison Table ('SCR' in row for '3283'). For TRIAC drive, use PT8A3284PEX (flash LED, timer) or PT8A3286PEX (constant LED, no timer) - both share identical pinout and supply specs but differ in gate output logic and LED behavior.

How does the IC distinguish between 120V and 240V line operation?

The IC analyzes the amplitude of the CLK input signal derived from the AC line. Higher input voltage produces higher CLK amplitude, which the internal comparator uses to select appropriate proportional gain and pulse width scaling. This allows automatic adaptation without external voltage-sense resistors or configuration pins.