Diodes Incorporated PT8A3287BPE

Overview

PT8A3287BPE 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, features NTC open-circuit protection, auto power-off after 1.2-hour timer timeout (at 50 Hz), and drives TRIACs with 160–240 µs trigger pulses up to 5 mA sink current. Used in curling irons and straighteners requiring precise thermal regulation.

For engineers reviewing the PT8A3287BPE datasheet, PT8A3287BPE pinout, PT8A3287BPE application, or PT8A3287BPE equivalent, key selection criteria include its constant-mode LED2 output, TRIAC-compatible GATE driver, 8-pin DIP-8 package, -20°C to +85°C operating range, and integrated Zener clamp at 4.5–5.5 V.

Technical Context

The PT8A3287BPE integrates a 5-bit ADC for NTC voltage sampling, internal clock synchronization to AC line frequency (50/60 Hz), and a state machine managing Heating-On/Off transitions. Its proportional control algorithm adjusts TRIAC firing angle based on real-time NTC feedback and detected line voltage level (high/low via CLK amplitude).

It delivers constant LED2 illumination (not flashing), disables LED1 blinking, and uses NTC1/NTC2 pins for both temperature sensing and open-wire fault detection. The GATE output provides low-side TRIAC triggering with 5 mA sink capability and 200 µs nominal pulse width under 4.5 V supply.

Key Specifications

Pinout & Package

PT8A3287BPE is housed in a lead-free 8-pin DIP (Dual In-line Package) per JEDEC MS-001D/BA, with 2.54 mm pitch, 9.0–9.4 mm body width, and 6.2–6.6 mm body length.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3287BPE, PT8A3285WE offers SOIC packaging and flashing LED2, while PT8A3286PE retains DIP-8 but uses flash mode - neither provides constant LED2 in DIP-8 like PT8A3287BPE, making it unique for steady-status implementations.

Availability

PT8A3287BPE is available at Aetrix Electronics and suitable for hair styling tools, electric blankets, and beauty device thermal modules requiring stable component supply, long-lifecycle support, and RoHS-compliant DIP packaging.

Supply support for PT8A3287BPE 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 and industrial applications before acquisition in 2016.

The PT8A328x series was developed specifically for cost-sensitive, safety-critical thermal control in portable AC-powered appliances - emphasizing integration, fault resilience, and dual-voltage adaptability without firmware.

FAQ

What is the function of the NTC2 pin on PT8A3287BPE?

NTC2 is an open-detection output pin that actively pulls low when the NTC sensor is disconnected or open-circuited. During normal operation, it remains in high-impedance state. This behavior enables hardware-level fault detection without software intervention, directly forcing the IC into heating-off mode for safety compliance.

Does PT8A3287BPE require an external crystal or oscillator?

No. PT8A3287BPE derives timing from the AC mains via the CLK pin, which accepts 50 Hz or 60 Hz zero-crossing signals. It contains no internal oscillator or crystal requirement - eliminating BOM cost and layout area while ensuring precise line-synchronized TRIAC triggering.

Can PT8A3287BPE drive a 240V/10A heating load directly?

No. PT8A3287BPE drives only the gate of an external TRIAC (e.g., BT139-600E); it does not switch main power. With 5 mA sink capability and 240 µs pulse width, it reliably triggers common 600 V, 12 A TRIACs used in 240 V systems when paired with appropriate snubber and gate resistor networks.

How does PT8A3287BPE differentiate between 120V and 240V line voltages?

It analyzes the amplitude of the CLK input signal: high-amplitude CLK corresponds to 240 V operation and triggers wider proportional GATE pulses, while low-amplitude CLK indicates 120 V and narrows pulse width - automatically maintaining consistent heater power output without user configuration or external sensing.