Diodes Incorporated PT8A3252WE

Overview

PT8A3252WE 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-designed for alumina-based high-watt-density heaters in consumer appliances.

For engineers reviewing the PT8A3252WE datasheet, PT8A3252WE pinout, PT8A3252WE application, or PT8A3252WE equivalent, key selection criteria include internal temperature threshold accuracy (±0.01 VB–REF2 per level), GATE output drive capability (–15 mA / +4 mA), dual-package availability (SOIC-16), and heater-self-sensing architecture eliminating external thermistors.

Technical Context

The PT8A3252WE implements a comparator-based analog control loop with two reference inputs (REF1, REF2) and a PTC sensor input to generate proportional SCR trigger timing. Its internal oscillator synchronizes to AC line frequency via CLK pin, enabling precise 50/60 Hz–locked thermal regulation.

It integrates LED scan drivers (C1/C2), bidirectional I/O pins (L1–L4) for key input and status indication, and a dedicated OT output that asserts high at 250°C to activate fuse-melting SCR-functionally decoupled from main heating control logic.

Key Specifications

Pinout & Package

PT8A3252WE is supplied in a lead-free SOIC-16 package (JEDEC MS-012E/AC), with 1.27 mm pitch, 0.40–1.27 mm lead length, and 1.35–1.75 mm body height - optimized for automated placement and thermal reliability in compact heater control boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3252PE and PT8A3254WE, the PT8A3252WE uniquely combines SOIC-16 surface-mount compatibility, hardware-enforced 1-hour auto-shutdown, and full 5-level thermal setpoint control - making it optimal for space-constrained, safety-certified consumer appliances.

Availability

PT8A3252WE is available at Aetrix Electronics and suitable for induction cooktops, commercial coffee brewers, medical warming cabinets, and industrial drying ovens requiring stable component supply with full RoHS-compliant traceability.

Supply support for PT8A3252WE 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 interface, timing, and power management ICs, founded in 1990 and headquartered in San Jose, California.

The PT8A3252 series belongs to Pericom's thermal management product line, specifically engineered for self-sensing ceramic heater control in cost-sensitive, high-reliability consumer and industrial appliances - emphasizing integration, safety, and analog precision over software dependency.

FAQ

What is the purpose of the VB pin?

The VB pin provides a regulated bias voltage to the ceramic heater's PTC element, enabling resistance measurement without external excitation circuitry. It sources current to the heater and forms the upper rail of the voltage divider whose ratio (VB–VPTC)/VB determines temperature - referenced against REF2 (0.7 V) for comparator threshold generation.

How does the PT8A3252WE achieve temperature compensation across ambient changes?

It uses dual-reference architecture: REF2 (0.7 V fixed) and REF1 (externally adjustable) establish a ratiometric measurement baseline. Since PTC resistance change is measured as a voltage ratio relative to VB, and VB tracks supply variations, the system rejects ambient temperature drift and supply fluctuations - delivering insensitivity to environment temperature per datasheet specification.

Can the 5 LED indicators be used for custom status signaling beyond temperature levels?

No - the LED outputs (L1–L4, C1/C2) are hardwired to indicate only the five fixed temperature setpoints (130°C to 190°C) and operate exclusively in multiplexed scan mode. Their behavior is fully determined by internal state machine logic; no register access or configuration is provided to repurpose them for generic status reporting.

What happens when the OT pin asserts high during over-temperature event?

When the PTC voltage reaches VOT250 = 0.539 × (VB–REF2), corresponding to ~250°C, the OT pin drives high (open-drain, pulled up externally) to activate a secondary SCR that melts a fuse in the heater power path. This action is independent of GATE output and provides hardware-level, non-resettable shutdown - requiring manual fuse replacement before restart.