Diodes Incorporated PT8A3300BPE

Overview

PT8A3300BPE from Pericom Semiconductor is a ceramic heater controller IC designed for direct SCR-triggered heating systems with integrated temperature sensing via PTC input and internal reference comparator. It operates at 4.0–5.0 V supply, delivers 15 mA high-current gate pulse (200 µs width), supports dual AC line frequencies (50/60 Hz), and includes auto power-off after 1.2 hours @50 Hz or 1 hour @60 Hz. Used in ceramic heating modules for appliances requiring self-contained thermal control without external sensors.

For engineers reviewing the PT8A3300BPE datasheet, PT8A3300BPE pinout, PT8A3300BPE application, or PT8A3300BPE equivalent, key selection criteria include its built-in 5 V zener regulation, VB bias voltage generation (80–120 µs pulse), REF/PTC-based analog temperature threshold detection, and DIP-8 package compatibility with legacy through-hole heater control PCBs.

Technical Context

The PT8A3300BPE implements a line-synchronized, analog-comparator-based thermal control loop: CLK input locks to AC zero-crossing; internal comparator compares PTC voltage against REF-derived threshold (VT +0.6%×(VB−VREF) for "B" variant); GATE output drives SCR with high-current, short-duration pulses to minimize false triggering at elevated temperatures. Its POR circuit ensures reliable startup at ≥2.0 V.

It integrates functional blocks including a 5 V zener regulator (enabling single-supply operation), LED driver with flash/constant modes, VB sampling switch (RON ≤15 Ω), and a 216,000-clock-cycle timer counting from 50/60 Hz CLK. No microcontroller or external timing components are required - all control logic is hardwired in analog/digital mixed-signal circuitry.

Key Specifications

Pinout & Package

PT8A3300BPE is supplied in lead-free 8-pin DIP (JEDEC MS-001D/BA) with 2.54 mm pitch. Package dimensions: 9.0–9.4 mm length × 6.2–6.6 mm width × 3.2–3.6 mm height (A2), 0.38–0.57 mm lead width (B).

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3300APE and PT8A3301BPE, the PT8A3300BPE uniquely balances fast thermal response with minimal preheat overshoot while providing flashing LED feedback - making it optimal for cost-sensitive, safety-critical consumer heating devices requiring intuitive operator indication.

Availability

PT8A3300BPE is available at Aetrix Electronics and suitable for electric kettle control, ceramic cooktop surface heater, and instant water heater module applications requiring stable component supply and long-term production continuity.

Supply support for PT8A3300BPE 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 provider of high-performance analog and mixed-signal ICs, specializing in timing, interface, and power management solutions for computing, communications, and consumer electronics.

The PT8A330x series was developed specifically for ceramic PTC heater control - integrating line synchronization, analog temperature comparison, SCR gate drive, and hardware safety timers into a single 8-pin IC to replace discrete control circuits in white goods and industrial heating systems.

FAQ

What is the purpose of the VB pin and how is it used in the thermal control loop?

The VB pin outputs a precisely timed 80–120 µs bias voltage pulse synchronized to the AC line cycle. This pulse energizes the PTC thermistor, allowing the internal comparator to measure its resistance relative to the REF voltage. The resulting comparison determines whether the GATE output triggers the SCR - forming a closed-loop analog temperature controller without software or external ADC.

Can PT8A3300BPE operate directly from rectified AC without a DC regulator?

Yes - its integrated 5 V zener regulator accepts 4.0–5.5 V input and tolerates ripple up to ±0.5 V. When powered from a rectified AC source with appropriate bulk capacitance (e.g., 47 µF), it regulates internally and supplies stable voltage to all internal blocks, eliminating need for external LDO or switching regulator.

How does the auto power-off timer function and is it configurable?

The timer counts 216,000 cycles of the CLK input - yielding 1.2 hours at 50 Hz or 1 hour at 60 Hz. It is fixed in hardware and non-configurable; reset occurs only on power-on or VDD drop below POR threshold (~2.0 V). This ensures fail-safe shutoff independent of external signals or firmware.

What is the difference between PT8A3300BPE and PT8A3300APE in thermal performance?

The "B" variant has a lower fast-heat threshold offset: VT +0.6%×(VB−VREF) versus VT +0.8%×(VB−VREF) for "A". This results in ~15% less temperature overshoot during preheat in ceramic heaters, improving thermal efficiency and reducing mechanical stress on PTC elements during repeated cycling.