Diodes Incorporated PT8A3302APEX

Overview

PT8A3302APEX from Pericom Semiconductor is a ceramic heater controller IC with integrated SCR gate driver, PTC temperature sensing interface, and 5V zener regulator. 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 features auto power-off after 1.2 hours @ 50 Hz or 1 hour @ 60 Hz. It enables direct ceramic heater control in compact appliances without external thermistors.

For engineers reviewing the PT8A3302APEX datasheet, PT8A3302APEX pinout, PT8A3302APEX application, or PT8A3302APEX equivalent, key selection criteria include its internal line-synchronized clock input (CLK), VB bias voltage generation for PTC sensing, GATE output timing tolerance (120–300 µs), LED driver capability, and DIP-8 package compatibility with thermal management in high-watt-density heating systems.

Technical Context

The PT8A3302APEX integrates a precision comparator with ±3 mV input offset, reference voltage generation (REF), and internal POR circuitry triggering reset at 2.0–3.0 V. Its CLK input synchronizes internal timing to AC line frequency, enabling accurate 50/60 Hz-based heating cycle control and timer expiration.

It implements a two-stage thermal control architecture: normal heat-up threshold (VT) and fast heat-up offset (VTH = VT + 0.4–2.3% × (VB − VREF)), selectable via part variant (A/B suffix). The GATE output drives SCRs directly with 15 mA peak current and 200 µs pulse width, while VB provides regulated bias for PTC sensor interface.

Key Specifications

Pinout & Package

PT8A3302APEX is supplied in an 8-pin DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Package conforms to JEDEC MS-001D/BA mechanical standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3302BPE and PT8A3301APE, the PT8A3302APEX offers flash-mode LED indication and higher VTH offset for faster initial heating-making it optimal for consumer appliances where rapid warm-up and clear operational feedback are prioritized over minimal overshoot.

Availability

PT8A3302APEX is available at Aetrix Electronics and suitable for electric kettle control, ceramic cooktop surface heating, handheld hair styler thermal management, and industrial heat sealing tools requiring stable component supply and long-term production continuity.

Supply support for PT8A3302APEX 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 2016 acquisition.

The PT8A330x series belongs to Pericom's dedicated thermal control product line, designed specifically for cost-sensitive, microcontroller-free ceramic heating systems requiring analog precision, line-synchronized timing, and integrated SCR drive capability.

FAQ

What is the function of the VB pin on PT8A3302APEX?

The VB pin outputs a regulated bias voltage (~1.7 V) used to excite the PTC thermistor in a voltage-divider configuration with the REF pin. Its on-resistance is ≤15 Ω at 100 mA load, and off-resistance exceeds 5 MΩ, enabling precise temperature-dependent voltage measurement at the PTC pin without external components.

Can PT8A3302APEX drive a 20 A SCR directly?

Yes - the GATE pin delivers ≥15 mA peak current in a 200 µs pulse, which meets the gate trigger requirements of standard 20 A SCRs (e.g., BT139-800). The pulse width and amplitude are specified across −20°C to +85°C, ensuring reliable turn-on even under worst-case leakage conditions at elevated temperatures.

How does the auto power-off timer work without an external crystal?

The timer uses the AC line frequency fed into the CLK pin as its timebase. At 50 Hz, 216,000 clock cycles equal 1.2 hours; at 60 Hz, the same count equals 1 hour. This eliminates need for quartz timing components, reducing cost and board space while maintaining ±5% timing accuracy across line voltage variations.

Is PT8A3302APEX RoHS-compliant and halogen-free?

Yes - the "E" suffix in PT8A3302APEX denotes lead-free (Pb-free) construction per RoHS Directive 2011/65/EU. Pericom's datasheet confirms compliance with JEDEC JS709B for halogen content, with chlorine and bromine each <900 ppm and total halogens <1500 ppm - verified via ICP-MS testing.