Diodes Incorporated PT8A3263BWEX

Overview

PT8A3263BWEX from Princeton Technology is a mixed-signal CMOS LSI NTC-based heating controller IC with 5-step temperature setting, NTC open protection, and direct TRIAC/SCR gate drive capability. It supports dual-voltage (120/240 VAC) operation with automatic line voltage and frequency (50/60 Hz) detection, features an internal 5 V Zener regulator, and delivers 300 µs gate trigger pulses up to 15 mA for reliable high-current switching in ceramic heater applications.

For engineers reviewing the PT8A3263BWEX datasheet, PT8A3263BWEX pinout, PT8A3263BWEX application, or PT8A3263BWEX equivalent, key selection criteria include NTC input voltage thresholds (1.083–3.014 V across 100–200 °C), GATE output pulse width (300 µs typ), internal power-off timer (60 min), LED drive capability (6-channel high-pulse), and DIP-16/SOIC-16 package compatibility.

Technical Context

This IC integrates analog NTC signal conditioning, digital temperature level decoding, and synchronized AC line-triggered gate control logic. Its four-level CLK comparator (VT1–VT4, 100 mV hysteresis) enables precise 120/240 VAC detection, while internal RC oscillator (80 kHz typ) governs timing functions including the 1-hour auto-power-off timer and LED flash modes.

The device implements hardware-level safety features: NTC open detection via NTC2 output, POR reset at 2.5–3.5 V, and thermal state-dependent GATE duty control-reducing SCR/TRIAC trigger duty to 12.5% above 90% setpoint under 220 VAC to prevent overheating.

Key Specifications

Pinout & Package

DIP-16 and SOIC-16 packages; JEDEC MS-001D/BB compliant; 19.0 mm × 6.4 mm body size; 2.54 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NTC-based heating controller applications.

Compared with PT8A3263BWEX, PT8A3264BWEX offers identical functionality with minor firmware-level calibration differences, while PT8A3265BWEX extends thermal range and output capability at the cost of added LED drive complexity and NTC network recalibration.

Availability

PT8A3263BWEX is available at Aetrix Electronics and suitable for ceramic heating controllers, electric kettles, heat sealing tools, and medical warming pads requiring stable component supply, long-lifecycle support, and dual-voltage compliance.

Supply support for PT8A3263BWEX 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

Princeton Technology Corporation is a Taiwan-based fabless semiconductor company specializing in mixed-signal ASICs for consumer and industrial control applications.

The PT8A32xx series was designed specifically for cost-sensitive, high-reliability heating appliances requiring integrated NTC sensing, line-synchronized power control, and minimal external components.

FAQ

What is the maximum NTC thermistor resistance supported by PT8A3263BWEX?

The IC does not specify a maximum NTC resistance value but defines operational behavior based on NTC1 input voltage: 1.083–3.014 V across 100–200 °C. Designers select NTC and bias resistor (e.g., RB = 10 kΩ) to ensure this voltage range is met at target temperatures. Typical configurations use 10 kΩ NTCs with 10 kΩ pull-up/down networks.

Can PT8A3263BWEX drive a 25 A TRIAC directly?

No. The GATE output delivers up to 15 mA peak current with 300 µs pulse width-sufficient for triggering 15 A TRIACs like the BT139-600E, but not 25 A devices. For higher-current TRIACs, an external driver stage (e.g., MOC3021 optocoupler + BJT buffer) is required to meet gate charge demands.

How does the auto power-off timer behave when the TM pin is left floating?

When TM is left unconnected (open), the internal pull-up activates and enables the 1-hour auto power-off timer. Grounding TM disables the timer permanently. No external pull-down is needed-the pin's default state is enabled, ensuring fail-safe shutdown unless explicitly disabled by the designer.

Is the PT8A3263BWEX compatible with both DIP-16 and SOIC-16 footprints on the same PCB?

Yes. The device is offered in both DIP-16 and SOIC-16 packages with identical pinout and electrical characteristics. PCB layouts can accommodate either variant using a single footprint with optional solder jumpers or zero-ohm resistors to route GND/VDD appropriately for thermal and mechanical constraints.