Diodes Incorporated PT8A3235WE

Overview

PT8A3235WE from Pericom Semiconductor is a mixed-signal CMOS LSI heating controller IC designed for automatic temperature regulation in 120V/240V hair curlers using external NTC sensors. It features dual-voltage operation, auto-heating-off after 1.2-hour timer (50Hz), direct SCR gate drive, NTC open-circuit protection, and constant-mode LED indication on pin 5. Its SOIC-8 package supports surface-mount assembly in compact thermal appliances.

For engineers reviewing the PT8A3235WE datasheet, PT8A3235WE pinout, PT8A3235WE application, or PT8A3235WE equivalent, key selection criteria include NTC-based analog threshold detection (VNTC0–VNTC2), 50/60Hz line-synchronized timing, GATE output capable of driving SCRs up to 2.5mA sink current, and single-key ON/OFF control with integrated LED driver functionality.

Technical Context

The PT8A3235WE implements a 2-bit ADC architecture that digitizes NTC voltage at pin NTC1 relative to VDD, comparing it against three programmable thresholds (VNTC0–VNTC2) to determine heating power level. It synchronizes all timing-including the 216,000-clock auto-shutoff timer-to the AC line frequency via CLK input.

Its control logic supports single-key operation: pin ON/OFF toggles heating state, while pin OFF drives LED2 inversely to LED1 (pin 5). The GATE output is active-high and directly triggers external SCRs without external amplification, with internal logic adjusting duty cycle based on both NTC voltage and line voltage (120V vs. 240V).

Key Specifications

Pinout & Package

PT8A3235WE is housed in a JEDEC MS-012E/AA compliant SOIC-8 package (4.7–5.1mm width, 3.8–4.0mm body height, 1.27mm lead pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3234WE and PT8A3236WE, the PT8A3235WE uniquely provides constant LED indication *and* enabled auto-shutoff-making it optimal for consumer-grade portable appliances requiring intuitive status and mandatory safety timing.

Availability

PT8A3235WE is available at Aetrix Electronics and suitable for hair curlers, flat irons, travel dryers, and electric blankets requiring stable component supply, lead-free compliance, and SOIC-8 surface-mount integration.

Supply support for PT8A3235WE 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 semiconductor company specializing in interface, timing, and power management ICs for consumer and industrial electronics.

The PT8A323x series belongs to Pericom's dedicated thermal control product line, engineered specifically for cost-sensitive, line-powered heating appliances requiring integrated NTC sensing, SCR drive, and safety timers without MCU intervention.

FAQ

What is the function of pin NTC2 on PT8A3235WE?

Pin NTC2 is a digital output that signals NTC open-circuit condition. When external NTC resistance exceeds 20MΩ, NTC2 is driven low; otherwise, it remains in high-impedance state. This output enables external fault indication or system-level safety interlock without additional circuitry.

Does PT8A3235WE require an external crystal or RC oscillator?

No. PT8A3235WE derives all timing-including the 1.2-hour auto-shutoff-from the 50/60Hz AC line signal applied to the CLK pin. No external timing components are needed, reducing BOM count and board space in cost-sensitive thermal controllers.

How does PT8A3235WE distinguish between 120V and 240V line operation?

The IC detects line voltage indirectly via CLK input frequency and internal logic calibration. At 60Hz, it assumes 120V and applies higher SCR conduction duty; at 50Hz, it assumes 240V and reduces duty cycle-preventing overheating without voltage-sensing resistors or auxiliary circuitry.

Can PT8A3235WE drive a TRIAC directly, or is an SCR required?

PT8A3235WE's GATE pin is optimized for direct SCR triggering (active-high, 2.5mA sink), not TRIACs. While some low-gate-charge TRIACs may respond, Pericom's application circuits specify SCRs. For TRIAC-based designs, a buffer transistor stage is recommended to ensure reliable gate charge delivery.