Diodes Incorporated PT8A3307LPE

Overview

PT8A3307LPE from Pericom Semiconductor is a ceramic heating controller IC designed for direct SCR-triggered temperature regulation in alumina heater systems. It integrates PTC-based self-sensing temperature control, 5V zener regulation, line-synchronized clock input (50/60 Hz), and auto power-off timing (1.2 hr @ 50 Hz). It operates across -20°C to +85°C with 4.0–5.0 V supply and drives GATE output with 200 µs high-current pulse (≥15 mA) for reliable 20 A SCR triggering.

For engineers reviewing the PT8A3307LPE datasheet, PT8A3307LPE pinout, PT8A3307LPE application, or PT8A3307LPE equivalent, this device serves as a single-chip solution for cost-sensitive, button-controlled ceramic heating systems requiring no external thermistor, minimal BOM count, and immunity to ambient temperature drift.

Technical Context

The PT8A3307LPE implements a line-locked timing architecture using CLK input derived directly from AC mains (50/60 Hz), enabling precise synchronization of heating cycles and auto-shutoff without crystal or RC oscillator. Its internal comparator monitors PTC resistance changes via VB–REF differential sensing, eliminating need for discrete temperature sensors.

It features dual-mode push-button interface (one-key toggle only for PT8A3307 variants), constant LED indication (non-flashing), and built-in POR reset. The GATE output delivers a 200 µs active-high pulse with ≥15 mA peak current, optimized to overcome SCR gate leakage at elevated temperatures while avoiding false triggering.

Key Specifications

Pinout & Package

PT8A3307LPE is supplied in Pb-free 8-pin DIP (JEDEC MS-001D/BA compliant) with 2.54 mm pitch, 9.2 mm width, and 6.4 mm body height. Thermal performance rated for 500 mW dissipation at TA ≤ +85°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3307HPE, the LPE version provides lower preheat overshoot for tighter thermal control; compared with PT8A3305LPE, it removes LED flashing logic to reduce EMI sensitivity and simplify user interface design.

Availability

PT8A3307LPE is available at Aetrix Electronics and suitable for ceramic hair tools, electric cooktops, industrial dryers, and medical warming devices requiring stable component supply, lead-free compliance, and long-lifecycle support.

Supply support for PT8A3307LPE 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, computing, and industrial markets before its 2016 acquisition.

The PT8A330x series was developed specifically for cost-sensitive, microcontroller-free ceramic heating systems-emphasizing integration of sensing, timing, and SCR drive in a single DIP/SOIC package.

FAQ

What is the function of the CLK pin on PT8A3307LPE?

The CLK pin accepts a 50/60 Hz square wave derived from AC mains to synchronize internal timing functions-including heating cycle duration and auto power-off countdown. It does not require external conditioning; input thresholds are specified at ±200 mV around ground, enabling direct coupling via resistive divider from rectified AC.

Can PT8A3307LPE drive an SCR without external amplification?

Yes. The GATE pin delivers a 200 µs active-high pulse with ≥15 mA peak current, sufficient to directly trigger standard 20 A SCRs such as BT139-600 or TYN625. No external transistor or driver stage is required, provided the SCR gate-cathode impedance remains below 100 Ω.

How does PT8A3307LPE sense temperature without a thermistor?

It uses the ceramic heater's integrated PTC (positive temperature coefficient) element as the sensor. The IC applies bias via VB, measures voltage drop across PTC relative to REF (0.7 V), and detects resistance change through comparator threshold shifts-enabling closed-loop control without discrete temperature sensors.

Is the auto power-off timer adjustable?

No. The timer is fixed at 216,000 clock cycles, resulting in 1.2 hours at 50 Hz or 1 hour at 60 Hz. There is no external resistor/capacitor or register setting to modify timing; it is hard-coded in silicon for safety-critical unattended operation compliance.