Diodes Incorporated PT8A3252WEX

Overview

PT8A3252WEX from Pericom Semiconductor is a ceramic heating controller IC with integrated SCR gate driver, 5-level temperature setpoint selection (130°C to 190°C), auto power-off timer (1 hr @ 60 Hz), over-temperature protection at 250°C, and direct PTC sensor interface - used in high-watt-density alumina heater systems for kitchen appliances and industrial heating panels.

For engineers reviewing the PT8A3252WEX datasheet, PT8A3252WEX pinout, PT8A3252WEX application, or PT8A3252WEX equivalent, this page delivers verified functional role, exact pin-level circuit behavior, real-world thermal control parameters, and validated alternative options for ceramic heater control designs requiring self-compensated, sensorless temperature regulation.

Technical Context

The PT8A3252WEX implements a dual-reference comparator architecture with internal voltage thresholds (e.g., VT130 = 0.467×(VB–REF2)) tied to PTC resistance changes, enabling precise, environment-insensitive ceramic heater temperature sensing without external thermistors. It uses line-synchronized clock input (CLK) for timing functions and generates active-high GATE pulses to directly trigger SCRs.

Its logic block includes on/off toggle, up/down key scanning (L1–L3), LED multiplexing (C1/C2/L4), and over-temperature detection (OT) that forces fuse-melting SCR activation at 250°C. The internal POR resets all outputs and LEDs on power-up, and the 216,000-clock auto-shutdown timer operates only in PT8A3252 (not PT8A3254).

Key Specifications

Pinout & Package

PT8A3252WEX is available in lead-free SOIC-16 package (JEDEC MS-012E/AC), 10.0 mm × 4.0 mm body, 1.27 mm pitch, 1.5 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3252WEX, PT8A3254WEX removes the 1-hour safety timer but retains identical thermal sensing and drive capability, while ST7FLITE29F2 trades hardware simplicity for software-defined control flexibility - making PT8A3252WEX optimal for cost-sensitive, safety-critical, fixed-setpoint ceramic heater applications.

Availability

PT8A3252WEX is available at Aetrix Electronics and suitable for electric kettle control, induction cooktop surface heater, and commercial coffee brewer applications requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for PT8A3252WEX 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 2017 acquisition.

The PT8A3252 series belongs to Pericom's ceramic heating controller product line, designed specifically for direct PTC-based temperature regulation in mains-powered heating appliances - emphasizing integration, safety compliance, and elimination of external sensing components.

FAQ

What is the function of the CLK pin on PT8A3252WEX?

The CLK pin accepts 50 Hz or 60 Hz AC line waveform to synchronize internal timing functions. It drives the 216,000-cycle auto power-off timer (1.0 hr @ 60 Hz, 1.2 hr @ 50 Hz) and enables zero-crossing SCR triggering - eliminating need for external crystal or frequency generator.

How does PT8A3252WEX achieve temperature compensation without an external sensor?

It uses the ceramic heater element itself as the PTC temperature sensor. The IC applies regulated VB voltage to the heater, measures resulting current via REF1/REF2 comparators, and leverages the known positive temperature coefficient of alumina-based heaters to derive temperature - fully compensating for ambient drift through dual-reference architecture.

Can PT8A3252WEX drive a 25 A SCR directly?

No. Its GATE output sources –15 mA at 2.5 V, suitable for triggering small-to-medium SCRs (≤2 A average current). For 25 A SCRs, an external driver stage (e.g., MOC3021 optotriac + BT139) is required - the IC provides logic-level control and timing, not power-level drive.

What is the difference between PT8A3252WEX and PT8A3254WEX?

PT8A3252WEX includes an internal 216,000-clock auto power-off timer (1 hr @ 60 Hz); PT8A3254WEX omits this timer but shares identical pinout, temperature thresholds, PTC interface, and SCR drive capability - making it suitable for continuous-operation heating systems.