Diodes Incorporated PT8A3245PE

Overview

PT8A3245PE from Pericom Semiconductor is a mixed-signal CMOS heating controller IC designed for single-key auto-temperature control in 120V/240V hair curlers, featuring NTC-based thermal sensing, SCR gate drive (active-high), 1-hour auto-off timer (60Hz), and dual-mode LED indication (constant-on). It integrates 2-bit ADC, NTC open-circuit protection, and voltage-adaptive power control.

For engineers reviewing the PT8A3245PE datasheet, PT8A3245PE pinout, PT8A3245PE application, or PT8A3245PE equivalent, key selection criteria include single-key ON/OFF logic, constant LED behavior during heating, 8-pin DIP-8 package compatibility, and direct SCR triggering without external driver stages.

Technical Context

The PT8A3245PE implements a clock-synchronized thermal control loop using internal 2-bit ADC sampling of NTC voltage at pins NTC1/NTC2 to determine heater duty cycle. Its timing engine derives CLK directly from AC line frequency (50/60 Hz) to synchronize the 1-hour auto-shutoff timer (216,000 clock cycles).

It supports dual-voltage operation by detecting input line voltage level and adjusting GATE output pulse width accordingly-ensuring safe heater power delivery across 110V and 220V mains without external voltage sensing circuitry.

Key Specifications

Pinout & Package

PT8A3245PE uses an 8-pin plastic dual in-line package (DIP-8) per JEDEC MS-001D/BA, with 2.54 mm pitch, 9.2 mm width, and 6.4 mm body height. Lead-free (Pb-free) construction complies with RoHS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3241PE and PT8A3244PE, PT8A3245PE uniquely combines constant LED indication *and* dedicated ON/OFF toggle on a single pin - enabling intuitive user interface with minimal external components while retaining full NTC open-fault protection and dual-voltage adaptability.

Availability

PT8A3245PE is available at Aetrix Electronics and suitable for hair styling appliances, electric blankets, and travel dryers requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for PT8A3245PE 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 its 2016 acquisition.

The PT8A324x series belongs to Pericom's dedicated thermal control product line, engineered specifically for cost-sensitive, safety-critical AC-heated consumer appliances with minimal external component count.

FAQ

What is the function of Pin 2 (NTC2) on the PT8A3245PE?

Pin 2 (NTC2) serves as an open-circuit detection output. When the NTC thermistor opens, NTC2 is driven low to disable the GATE output and initiate LED2 flashing at 1/8 CLK frequency. During normal operation, NTC2 remains in high-impedance state and does not source/sink current.

Can the PT8A3245PE be used with 50 Hz mains frequency?

Yes - the internal timer scales automatically: 216,000 clock cycles yield ~1.2 hours at 50 Hz and ~1.0 hour at 60 Hz. All thermal control logic, including NTC sampling and SCR phase adjustment, remains fully functional across both frequencies without configuration change.

Does the PT8A3245PE require an external crystal or RC oscillator?

No - it uses the AC line-derived CLK signal (Pin 3) as its sole timing reference. No external oscillator is needed; the device synchronizes directly to zero-crossings of the mains voltage via a simple resistor-capacitor network feeding Pin 3.

How does the PT8A3245PE handle NTC voltage thresholds?

It compares NTC1 voltage against three internal thresholds (VNTC0 ≈ 0.385×VDD, VNTC1 ≈ 0.385×VDD, VNTC2 ≈ 0.40×VDD) to determine heater duty cycle. These thresholds are factory-trimmed and stable over temperature; no external calibration is required.