Diodes Incorporated PT8A3301AWE

Overview

PT8A3301AWE from Pericom Semiconductor is a ceramic heater controller IC with integrated SCR gate driver, PTC temperature sensing interface, and auto-shutdown timer. 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 internal 5 V zener regulation. Used in ceramic heating systems requiring self-contained thermal control without external sensors.

For engineers reviewing the PT8A3301AWE datasheet, PT8A3301AWE pinout, PT8A3301AWE application, or PT8A3301AWE equivalent, key selection criteria include its direct SCR triggering capability, PTC-based closed-loop temperature setpoint control, 1.2-hour auto-off timing at 50 Hz, and SOIC-8 package compatibility with surface-mount reflow processes.

Technical Context

The PT8A3301AWE implements a dedicated analog thermal control architecture: an internal comparator monitors voltage across a PTC thermistor connected between PTC and REF pins, comparing it against a scaled reference derived from VB. Its CLK input synchronizes all timing-including gate pulse generation and auto-off countdown-to the AC line frequency via zero-cross detection.

It integrates a high-current push-pull output stage on GATE (capable of 15 mA sink/source) and a dedicated VB bias generator that supplies regulated sampling current to the PTC network. The LED driver provides constant-current sinking (5 mA min) for status indication, while the internal POR circuit ensures reliable startup at ≥2.0 V.

Key Specifications

Pinout & Package

PT8A3301AWE is housed in a lead-free, RoHS-compliant 8-pin SOIC package (JEDEC MS-012E/AA), 4.7–5.1 mm wide, 3.8–4.0 mm body width, 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3301APE and PT8A3300AWE, the PT8A3301AWE offers surface-mount compatibility, constant LED indication for simplified UI design, and higher thermal overshoot tolerance during preheat-making it optimal for production-grade medical and industrial ceramic heating modules.

Availability

PT8A3301AWE is available at Aetrix Electronics and suitable for ceramic hair styling irons, electric cooktops, industrial drying chambers, and medical warming pads requiring stable component supply and long-lifecycle support.

Supply support for PT8A3301AWE 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 computing, communications, and industrial markets before its 2016 acquisition.

The PT8A330x series belongs to Pericom's thermal control product line, designed specifically for cost-sensitive, sensorless ceramic heating applications where integration, reliability, and AC-line synchronization are critical.

FAQ

What is the maximum SCR current rating supported by PT8A3301AWE?

The PT8A3301AWE delivers a 15 mA peak gate drive pulse with 200 µs width, sufficient to trigger SCRs rated up to 20 A under typical junction temperatures. It does not drive SCRs above 20 A directly; external gate drivers are required for higher-current devices. The pulse timing and current comply with standard SCR gate sensitivity specifications (e.g., MCR100, BT136).

Can PT8A3301AWE operate from a 12 V supply?

No-PT8A3301AWE requires a 4.0–5.0 V supply. However, its internal 5 V zener allows connection to unregulated 5–12 V inputs via a series current-limiting resistor (e.g., 1 kΩ for 12 V). The zener clamps VDD to ~5 V and sinks excess current; power dissipation in the zener must stay below 500 mW per absolute maximum ratings.

How is temperature setpoint adjusted on PT8A3301AWE?

Setpoint is adjusted by selecting the resistor value between VB and REF pins. The internal comparator triggers heating when PTC voltage falls below VT = 0.5(VB − VREF). Since VREF is fixed at 0.7 V and VB is regulated, changing the VB-to-REF resistor alters the effective PTC voltage threshold-and thus the corresponding PTC resistance (and temperature) at which heating begins.

Does PT8A3301AWE require an external crystal or oscillator?

No-PT8A3301AWE derives all timing from the AC line via the CLK pin. It contains no internal oscillator or crystal interface. The 50/60 Hz line frequency directly controls gate pulse timing, auto-off countdown, and LED flash rate (for variants), eliminating timing component cost and layout complexity.