Diodes Incorporated PT8A3295PE

Overview

PT8A3295PE from Pericom Semiconductor is a mixed-signal CMOS heating controller IC designed for single-button (ON/OFF) proportional temperature regulation in 120V/240V AC appliances. It integrates 5-bit ADC, NTC open detection, auto-heating-off timer (1.15–1.25 hr), Zener-regulated 5.0 V reference, and 160–240 µs TRIAC gate trigger pulse. Used in hair straighteners and curling irons with external NTC feedback.

For engineers reviewing the PT8A3295PE datasheet, PT8A3295PE pinout, PT8A3295PE application, or PT8A3295PE equivalent, key selection criteria include its constant-mode LED indicator, single-key ON/OFF logic, 50/60 Hz line-synchronized timing, 20 mA max output drive, and DIP-8 package compatibility with thermal management in compact consumer heating devices.

Technical Context

The PT8A3295PE implements a closed-loop proportional control algorithm using an internal 5-bit ADC to sample NTC voltage, dynamically adjusting TRIAC firing angle based on real-time temperature deviation. Its CLK input synchronizes all timing-including heater timeout and LED flash-to AC line frequency (50/60 Hz).

NTC open protection actively pulls NTC1 low when open-circuit is detected; the integrated Zener diode (4.5–5.5 V at 500 µA–10 mA) enables self-biased operation without external regulators. The GATE output delivers 5 mA sink current at 0.5 V to directly drive high-current SCR/TRIAC gates.

Key Specifications

Pinout & Package

PT8A3295PE is housed in an 8-pin lead-free DIP package (JEDEC MS-001D/BA), with 0.3 inch body width, 9.0–9.4 mm length, and 6.2–6.6 mm width-optimized for wave-soldering and manual assembly in cost-sensitive consumer PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3294PE and PT8A3296PE, the PT8A3295PE uniquely combines constant LED2 indication, built-in 1.2-hour auto-off timer, and NTC open detection-making it the only variant qualified for UL/IEC-compliant self-contained heating appliances without external safety circuitry.

Availability

PT8A3295PE is available at Aetrix Electronics and suitable for hair straighteners, curling irons, and travel flat irons requiring stable component supply, dual-voltage compatibility, and integrated safety features.

Supply support for PT8A3295PE 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.

The PT8A329x series was developed specifically for cost-sensitive AC-powered personal care appliances, integrating analog sensing, digital control, and power interface functions into a single 8-pin package.

FAQ

What is the function of the NTC2 pin on PT8A3295PE?

The NTC2 pin is an open-drain output used exclusively for NTC open-circuit detection. When the NTC sensor becomes disconnected, the IC pulls NTC2 low to signal the fault condition. This action forces the heater into safe-off state and can be monitored externally to trigger system-level alerts or disable downstream power stages.

Does PT8A3295PE require an external voltage regulator?

No. PT8A3295PE includes an internal Zener diode rated at 4.5–5.5 V (at 500 µA–10 mA), enabling direct connection to unregulated DC derived from a rectified AC line. This eliminates the need for an external LDO or linear regulator, reducing bill-of-materials cost and board space.

How does PT8A3295PE distinguish between 120V and 240V line operation?

It analyzes the amplitude of the CLK input signal-derived from the AC line via a resistive divider. Higher CLK voltage indicates 240 V operation, prompting the IC to reduce proportional control gain and extend the heating timer to avoid overheating or premature shutdown under higher voltage conditions.

Can PT8A3295PE drive a TRIAC directly without a driver transistor?

Yes. The GATE pin delivers up to 5 mA sink current at 0.5 V, sufficient to trigger common medium-power TRIACs (e.g., BT136, TIC226) used in ≤1500 W heating loads. No external buffer transistor is required unless driving high-dI/dt or high-I_GT devices beyond this specification.