Diodes Incorporated PT8A3305LPE

Overview

PT8A3305LPE from Pericom Semiconductor is a ceramic heating controller IC designed for direct SCR-triggered temperature-regulated heating systems. It integrates PTC-based self-sensing temperature control, 5V zener regulation, AC line-synchronized clock input (50/60 Hz), LED driver output, and auto power-off timer (1.2 hr @ 50 Hz). It operates across -20°C to +85°C with 4.0–5.0 V supply and supports dual-voltage 120/240 VAC heater systems.

For engineers reviewing the PT8A3305LPE datasheet, PT8A3305LPE pinout, PT8A3305LPE application, or PT8A3305LPE equivalent, key selection considerations include its one-key toggle ON/OFF function, constant LED indication mode, low-overshoot fast-heat threshold (VTH – VT = +0.4% to +0.8% of VB–VREF), internal 200 µs GATE pulse width, and DIP-8 lead-free package compatibility with alumina heater control boards.

Technical Context

The PT8A3305LPE implements a dedicated analog comparator-based thermal control loop using the PTC pin as both temperature sensor interface and push-button input, eliminating external thermistors. Its internal oscillator synchronizes to AC line frequency via CLK pin, enabling precise timing for heating cycles and auto-shutoff.

It features high-current pulse triggering (IOH = –15 mA, Tal_GATE = 200 µs typ.) optimized for reliable SCR turn-on under high-temperature leakage conditions, while VB pin provides bias voltage sampling and push-button functionality through a 15 Ω on-resistance switch (RON_VB).

Key Specifications

Pinout & Package

PT8A3305LPE is supplied in an 8-pin DIP (Dual In-line Package) per JEDEC MS-001D/BA, with 2.54 mm pitch, body width 6.2–6.6 mm, and height 3.71–4.31 mm. Lead-free (Pb-free) finish complies with RoHS Directive 2011/65/EU.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3305HPE and PT8A3301LWE, the PT8A3305LPE uniquely combines DIP-8 mechanical robustness, one-key simplicity, and low-overshoot thermal response - making it optimal for cost-sensitive, high-reliability ceramic heater modules where user interface and thermal precision are balanced.

Availability

PT8A3305LPE is available at Aetrix Electronics and suitable for electric kettle control, ceramic cooktop surface regulation, and medical warming pad thermal management requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.

Supply support for PT8A3305LPE 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) is a fabless semiconductor company specializing in interface, timing, and power management ICs for consumer, computing, and industrial markets.

The PT8A330x family was developed specifically for contactless, self-sensing ceramic heating systems - targeting appliance manufacturers needing integrated, low-cost, and certification-ready thermal control without firmware development.

FAQ

What is the function of the VB pin on PT8A3305LPE?

The VB pin serves dual roles: it supplies bias voltage to the external PTC thermistor network and acts as a push-button input in one-key configurations. Its on-resistance is ≤15 Ω, enabling accurate voltage division without significant self-heating error. During button press, VB is shorted to GND, triggering ON/OFF state change - verified per Function Comparison Table and Electrical Characteristics (RON_VB).

Does PT8A3305LPE require an external crystal or RC oscillator?

No. The PT8A3305LPE derives timing exclusively from the AC mains via the CLK pin, supporting 50 Hz or 60 Hz line-synchronized operation. This eliminates external timing components, reduces BOM cost, and improves long-term reliability. Internal oscillator accuracy is tied directly to grid frequency - no crystal, capacitor, or resistor is needed for basic operation.

How does the auto power-off timer behave under varying line frequencies?

The timer counts line cycles: 216,000 cycles total. At 50 Hz, this equals 1.2 hours (216,000 ÷ 3600 s/h ÷ 50 Hz); at 60 Hz, it equals 1.0 hour (216,000 ÷ 3600 s/h ÷ 60 Hz). This behavior is confirmed in Electrical Characteristics (TPOoff = 1.15–1.25 hr @ 50 Hz) and Function Description - no reconfiguration is required for regional AC standards.

Can PT8A3305LPE drive SCRs rated above 20 A?

The GATE output delivers ≥15 mA peak current with 200 µs pulse width - sufficient to trigger 20 A SCRs per datasheet claim. For higher-current SCRs (e.g., 40 A), a buffer stage (e.g., MOC3021 optocoupler + BJT) is recommended. Direct drive beyond 20 A risks insufficient gate charge and unreliable turn-on, especially at elevated junction temperatures.