Diodes Incorporated PT8A3362SEX

Overview

PT8A3362SEX from Pericom Semiconductor is a mixed-signal CMOS LSI heating controller IC that integrates NTC-based temperature sensing, LCD display driving, backlight control, and TRIAC/SCR gate triggering. It supports dual voltage (120V/240V) operation, provides 11 temperature setpoints (100–200°C or 210–395°F), delivers 15mA pulse-triggered GATE output, and features auto power-off after 60 minutes. It is used in embedded heating appliances such as electric kettles, coffee makers, and soldering irons.

For engineers reviewing the PT8A3362SEX datasheet, PT8A3362SEX pinout, PT8A3362SEX application, or PT8A3362SEX equivalent, key selection considerations include its integrated NTC open-circuit protection, 300µs GATE pulse width, SOIC-24 package compatibility, dual-unit (°C/°F) display support, and internal 5V zener regulation.

Technical Context

The PT8A3362SEX implements a dedicated analog front-end for NTC voltage digitization across 32 calibrated temperature steps (0–234°C), with ADC input range of 0.08–3.18V at VDD = 4.5V. Its line-synchronized clock input (CLK) accepts 50/60Hz AC-derived signals with ±300mV hysteresis and 1.7–2.1V threshold levels to enable zero-crossing–aware power control.

It drives LCD segments via 6 SEG and 4 COM outputs using 1/4-duty, 1/3-bias TN-mode signaling at 5V, while generating three independent backlight signals (BL1/BL2/BL3) with distinct timing behaviors: BL1 asserts during full heating, BL2 pulses for 6s on key press, and BL3 sustains during temperature hold mode.

Key Specifications

Pinout & Package

PT8A3362SEX is housed in a lead-free, RoHS-compliant SOIC-24 package (JEDEC MS-013E/AD), with 1.27mm pitch, 15.4mm body length, and 7.5mm body width. Thermal performance supports continuous operation up to +85°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3362PE and PT8A3362LE, the PT8A3362SEX offers optimal balance of manufacturability (SOIC-24), thermal dissipation, and compatibility with standard automated SMT lines-making it the default choice for high-volume consumer appliance production.

Availability

PT8A3362SEX is available at Aetrix Electronics and suitable for electric kettle control, coffee maker thermostats, soldering iron regulators, and industrial heat gun interfaces requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for PT8A3362SEX 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, specializing in mixed-signal solutions for consumer and industrial applications.

The PT8A336x series belongs to Pericom's dedicated appliance control product line, designed specifically to replace microcontroller-based thermal management subsystems with single-chip, firmware-free alternatives for cost-sensitive, safety-critical heating applications.

FAQ

What is the maximum TRIAC/SCR current rating supported by the PT8A3362SEX GATE output?

The GATE output delivers a 300µs pulse with 15mA peak current, sufficient to trigger standard 20A TRIACs (e.g., BTA20-600B) without external buffering. It is not rated for direct drive of >25A devices; a Darlington buffer or opto-TRIAC stage is required above that threshold. Pulse timing is fixed and non-adjustable.

Does the PT8A3362SEX require an external crystal or RC oscillator?

No. The PT8A3362SEX uses the AC line frequency (50Hz or 60Hz) fed into the CLK pin as its sole timing reference. This eliminates all external timing components-including crystals, capacitors, and resistors-reducing BOM cost and improving long-term stability across temperature and voltage variations.

How does the NTC open-circuit protection function work?

When the NTC sensor disconnects, the NTC1 input voltage rises above the detection threshold. The IC asserts NTC2 low, which can be wired to disable the GATE output or trigger an external latch. This failsafe behavior is implemented in hardware and requires no firmware intervention, meeting IEC 60335-1 thermal cutoff requirements.

Can the PT8A3362SEX drive a 12-pin LCD module?

Yes. The IC supports both 10-pin and 12-pin 5V LCD modules via its 4 COM and 6 SEG outputs. Pin mapping follows standard TN-mode conventions (1/4-duty, 1/3-bias), and the internal LCD driver generates correct RMS-on/off voltages (0.577VDD and 0.236VDD) without external bias resistors.