Diodes Incorporated PT8A3230PEX

Overview

PT8A3230PEX from Pericom Semiconductor is a mixed-signal CMOS LSI heating controller IC designed for automatic temperature regulation in 120V/240V hair curlers using external NTC sensors. It integrates dual-voltage detection, auto-heating-off timer (1.2h @50Hz), NTC open-circuit protection, and direct SCR gate drive. Key parameters include VDD = 3.5–5.5V, operating temperature –20°C to +85°C, and GATE output current ≥2.5mA.

For engineers reviewing the PT8A3230PEX datasheet, PT8A3230PEX pinout, PT8A3230PEX application, or PT8A3230PEX equivalent, key selection criteria include NTC-based thermal feedback compatibility, 50/60Hz line-synchronized timing, dual-voltage power line adaptation, SCR gate drive capability, and LED indicator control with flash modes tied to NTC voltage thresholds.

Technical Context

The PT8A3230PEX implements a 2-bit ADC for NTC voltage sampling across three threshold bands (VNTC0–VNTC2), enabling discrete temperature zone detection. Its internal state machine transitions between Reset, Heating-On, and Heating-Off states based on ON/OFF button inputs and timer expiration.

CLK input synchronizes all timing functions-including the 216,000-clock auto-off timer-to AC line frequency (50/60Hz). GATE output drives an external SCR with active-high logic; LED outputs (Pin 5 and Pin 7) provide inverse-coded visual status via flash patterns (1/32 CLK or 1/8 CLK) dependent on NTC condition and voltage level.

Key Specifications

Pinout & Package

PT8A3230PEX is packaged in lead-free 8-pin DIP (JEDEC MS-001D/BA compliant), with 2.54mm pitch and body dimensions 9.0–9.4mm × 6.2–6.6mm × 3.0–3.6mm (L×W×H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3234WE and PT8A3232PE, the PT8A3230PEX uniquely supports two independent mechanical buttons (ON/OFF), retains the auto-off timer, and uses DIP-8 packaging-making it optimal for cost-sensitive, serviceable, and safety-certified consumer thermal appliances.

Availability

PT8A3230PEX is available at Aetrix Electronics and suitable for hair curlers, flat irons, travel dryers, and electric blankets requiring stable component supply, dual-voltage AC compatibility, and certified thermal safety features.

Supply support for PT8A3230PEX 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 PT8A323x series was developed specifically for cost-sensitive, safety-critical thermal control in AC-powered personal care appliances-emphasizing hardware-based reliability over firmware-dependent implementations.

FAQ

What is the function of Pin 2 (NTC2) on the PT8A3230PEX?

Pin 2 (NTC2) is an open-drain output used exclusively for NTC open-circuit detection. When the NTC sensor becomes disconnected or exceeds ~20MΩ, NTC2 pulls low, forcing GATE=0 and initiating LED2 flash mode (1/8 CLK) to indicate fault. It does not carry analog measurement data or serve as a general-purpose I/O.

Can the PT8A3230PEX operate without an external NTC sensor?

No. The PT8A3230PEX requires an external NTC thermistor connected between NTC1 and GND to enable temperature sensing, auto-off timing modulation, and open-circuit safety shutdown. Operating without NTC causes undefined behavior: GATE remains inactive, LED indicators flash erratically, and thermal regulation is disabled per design safety architecture.

How does the PT8A3230PEX adapt to 120V vs. 240V power lines?

The device detects RMS line voltage via internal circuitry analyzing CLK amplitude and timing relationships. At 240V, it reduces SCR conduction time per half-cycle to prevent overheating; at 120V, it extends conduction to maintain target temperature-achieving automatic power scaling without external components or configuration pins.

Is the PT8A3230PEX RoHS-compliant and halogen-free?

Yes. The "E" suffix in PT8A3230PEX denotes lead-free and green (halogen-free) construction per JEDEC J-STD-609A. The DIP-8 package uses matte tin plating over copper leadframe and meets IPC/JEDEC J-STD-020 moisture sensitivity level MSL3, verified in Pericom's original qualification report PT0211-6.