Diodes Incorporated PT8A3300BWE

Overview

PT8A3300BWE from Pericom Semiconductor is a ceramic heater controller IC with integrated SCR gate driver, PTC temperature sensing interface, and auto-shutdown timer. It operates from 4.0–5.5 V, delivers 15 mA peak gate drive at 200 µs pulse width, supports 50/60 Hz line-synchronized timing, and features internal 5 V zener regulation. It enables direct control of alumina ceramic heaters in dual-voltage (120/240 VAC) heating systems without external temperature sensors.

For engineers reviewing the PT8A3300BWE datasheet, PT8A3300BWE pinout, PT8A3300BWE application, or PT8A3300BWE equivalent, key selection criteria include its built-in line-synchronized clock input (CLK), VB bias voltage generation for PTC sensing, GATE output timing tolerance (120–300 µs over -20°C to +85°C), and dual-voltage AC compatibility in compact SOIC-8 packaging.

Technical Context

The PT8A3300BWE implements a dedicated analog control loop for ceramic heating: CLK synchronizes internal timing to AC mains frequency; PTC input interfaces directly with NTC/PTC thermistors via REF and VB bias; the internal comparator compares PTC voltage against VT and VTH thresholds to modulate SCR firing duty cycle. Its POR circuit ensures reliable startup at ≥2.0 V.

It integrates a 1.2-hour auto-off timer (at 50 Hz) or 1-hour timer (at 60 Hz), LED driver for status indication, and high-current pulse-triggered GATE output capable of driving 20 A SCRs. The VB pin provides regulated bias current (RON_VB ≤15 Ω) while maintaining high off-state impedance (ROFF_VB ≥5 MΩ).

Key Specifications

Pinout & Package

PT8A3300BWE is housed in a lead-free, RoHS-compliant SOIC-8 package (JEDEC MS-012E/AA), measuring 4.7–5.1 mm × 3.8–4.0 mm × 1.35–1.75 mm, with 1.27 mm pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3300AWE and PT8A3301BWE, the PT8A3300BWE uniquely combines flash-mode LED indication, low-overshoot preheat (VTH = VT +0.4–0.8%), and integrated 1-hour/1.2-hour auto-off - making it optimal for safety-certified consumer appliances requiring both user feedback and fail-safe thermal cutoff.

Availability

PT8A3300BWE is available at Aetrix Electronics and suitable for electric kettle control, ceramic cooktop surface heating, instant water heater modules, and industrial ceramic dryer systems requiring stable component supply and long-term lifecycle support.

Supply support for PT8A3300BWE 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 timing, interface, and power management solutions for consumer, industrial, and communications markets.

The PT8A330x series belongs to Pericom's thermal control product line, designed specifically for cost-sensitive, high-reliability ceramic heating applications requiring integrated sensing, timing, and SCR drive - eliminating microcontroller dependency in Class I/II household appliances.

FAQ

What is the purpose of the VB pin on PT8A3300BWE?

The VB pin provides a regulated bias current source (RON_VB ≤15 Ω) to excite the PTC thermistor connected between VB and PTC pins. It enables ratiometric temperature measurement by establishing a known current path, eliminating the need for external current sources or precision resistors. Its high off-state impedance (≥5 MΩ) prevents leakage errors during measurement cycles.

Can PT8A3300BWE operate without an external crystal or oscillator?

Yes. PT8A3300BWE uses the CLK pin to synchronize all internal timing-including the auto-off timer and SCR gating-to the AC mains frequency (50/60 Hz). This eliminates the need for any external crystal, RC oscillator, or clock generator, reducing BOM count and improving reliability in high-temperature environments where crystals may drift or fail.

How does the auto power-off timer work, and is it adjustable?

The auto power-off timer counts AC line cycles via the CLK input: 216,000 cycles equals 1 hour at 60 Hz or 1.2 hours at 50 Hz. It is fixed and non-adjustable-designed to meet IEC/UL thermal safety requirements for consumer heating appliances. No external components or programming are required; timing accuracy depends solely on line frequency stability.

What is the difference between PT8A3300BWE and PT8A3300AWE?

The PT8A3300BWE and PT8A3300AWE share identical pinout, package, and core functionality but differ in two confirmed parameters: (1) LED behavior-BWE flashes at 1.5 Hz during heating, AWE flashes only during preheat; (2) VTH offset-BWE uses lower overshoot (VT +0.4–0.8%), AWE uses higher (VT +0.8–1.2%). Both retain the same 1-hour/1.2-hour auto-off timer.