Diodes Incorporated PT8A3286PE

Overview

PT8A3286PE from Pericom Semiconductor is a mixed-signal CMOS heating controller IC designed for dual-voltage (120V/240V) hair styling appliances. It implements proportional temperature control using an external NTC sensor, includes NTC open-circuit protection, delivers 5.0 mA low-side TRIAC gate drive, and features a 1.2-hour auto-shutoff timer at 50 Hz. It operates across –20°C to +85°C in an 8-pin DIP package.

For engineers reviewing the PT8A3286PE datasheet, PT8A3286PE pinout, PT8A3286PE application, or PT8A3286PE equivalent, key selection criteria include its flash-mode LED2 indicator, NTC-based closed-loop thermal regulation, 160–240 µs TRIAC trigger pulse width, internal 5.0 V Zener clamp, and compatibility with 50/60 Hz line-synchronized clock input.

Technical Context

The PT8A3286PE integrates a 5-bit ADC for NTC voltage sampling, a state-machine-based heater controller with reset, heating-on, and heating-off modes, and a line-frequency synchronized timing engine. Its CLK input accepts 50/60 Hz AC-derived signals to derive precise 1.2-hour (50 Hz) or 1-hour (60 Hz) timeout intervals.

It provides two LED drivers (LED1/LED2), one configured as flash mode (LED2), and a dedicated low-side GATE output optimized for TRIAC triggering - distinct from SCR variants in the same family. NTC1/NTC2 pins implement both temperature sensing and open-detection logic via internal biasing and impedance monitoring.

Key Specifications

Pinout & Package

PT8A3286PE is housed in an 8-pin plastic DIP (Dual In-line Package) per JEDEC MS-001D/BA, with lead-free finish (Pb-free). Package dimensions: 9.2 mm × 6.4 mm × 3.3 mm (D × E × A2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3284PE and PT8A3285WE, PT8A3286PE uniquely combines flash-mode LED2 with *no* built-in timer - enabling simplified thermal UI without time-based constraints, ideal for manual-control appliances where user determines duration.

Availability

PT8A3286PE is available at Aetrix Electronics and suitable for hair curlers, hair straighteners, and beauty appliance control modules requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for PT8A3286PE 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 interface, timing, and power management ICs for consumer and industrial applications before its 2016 acquisition.

The PT8A328x series was developed specifically for cost-sensitive, thermally regulated personal care appliances - integrating analog sensing, digital control, and power interface into a single 8-pin device.

FAQ

What is the function of the NTC2 pin on PT8A3286PE?

NTC2 is a dedicated open-circuit detection terminal. When the external NTC sensor becomes disconnected, the IC pulls NTC2 low to signal fault condition and forces entry into heating-off state. It operates in high-impedance mode during normal operation and does not source/sink current unless an open is detected.

Can PT8A3286PE drive a TRIAC directly without external components?

Yes - the GATE pin delivers up to 5.0 mA sink current with 160–240 µs pulse width, sufficient to trigger common 4–8 A sensitive-gate TRIACs (e.g., MAC97A6, BT134). No external transistor or driver is required, though a series gate resistor (100 Ω) is recommended for EMI suppression and current limiting.

How does PT8A3286PE distinguish between 120 V and 240 V line voltages?

It does not measure RMS voltage directly. Instead, it uses the amplitude of the CLK input signal (derived from mains via resistive divider) to determine line level: high-amplitude CLK corresponds to 240 V operation and adjusts proportional control gain accordingly, while low-amplitude CLK selects 120 V scaling - ensuring consistent thermal response across regions.

Is PT8A3286PE compatible with NTC thermistors of different resistance values?

Yes - the internal 5-bit ADC and proportional algorithm accommodate standard 10 kΩ NTCs at 25°C. The design assumes a typical β-value of ~3950 K; deviations beyond ±10% may require minor external resistor tuning on the NTC1 divider network to maintain setpoint accuracy within ±3°C.