Diodes Incorporated PT8A3280CWE

Overview

PT8A3280CWE 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, provides NTC open-circuit protection, delivers 160–240 µs SCR trigger pulses up to 15 mA, and integrates internal 4.5–5.5 V Zener regulation. It operates across –20°C to +85°C in SOIC-8 package.

For engineers reviewing the PT8A3280CWE datasheet, PT8A3280CWE pinout, PT8A3280CWE application, or PT8A3280CWE equivalent, key selection criteria include its dual-line voltage auto-adaptation, NTC-based closed-loop thermal regulation, 1-hour heating timer (50/60 Hz synchronized), LED indicator modes, and SCR gate drive capability with built-in Zener clamp.

Technical Context

The PT8A3280CWE integrates a 5-bit ADC for NTC voltage sampling, a clock-synchronized heating timer (216,000 CLK cycles = ~1.2 hr at 50 Hz / ~1 hr at 60 Hz), and logic-controlled proportional output to the GATE pin. Its NTC1/NTC2 interface enables real-time open-circuit detection by monitoring impedance discontinuity.

Internal Zener regulation (4.5–5.5 V) stabilizes VDD under varying input conditions, while the CLK input directly synchronizes phase-control timing to AC line frequency. The GATE output drives SCR gates with 5 mA sink current and 15 mA source current, supporting high-current heating loads without external drivers.

Key Specifications

Pinout & Package

PT8A3280CWE is housed in a lead-free, RoHS-compliant 8-pin SOIC package (JEDEC MS-012E/AA), measuring 4.7–5.1 mm × 3.8–4.0 mm × 1.35–1.75 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT8A3284CWE and PT8A3282CWE, the PT8A3280CWE uniquely combines SCR gate drive with flash-mode dual-LED indication and full NTC open protection - making it optimal for consumer hair tools requiring intuitive user feedback and robust fault handling.

Availability

PT8A3280CWE is available at Aetrix Electronics and suitable for hair curlers, straighteners, and thermostatic heaters requiring stable component supply, dual-voltage operation, and integrated safety timer functionality.

Supply support for PT8A3280CWE 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.

The PT8A3280 series belongs to Pericom's dedicated heating controller product line, engineered specifically for low-cost, single-chip thermal management in portable beauty appliances with stringent safety and BOM-reduction requirements.

FAQ

What is the maximum SCR gate current drive capability of PT8A3280CWE?

The PT8A3280CWE GATE pin provides 15 mA source current and 5 mA sink current into a 0.5 V load, enabling direct drive of common medium-power SCRs like the MCR100-6 or BT169 without external buffers. Pulse width is fixed at 160–240 µs, matching typical SCR turn-on time requirements.

How does PT8A3280CWE detect NTC open-circuit faults?

It monitors NTC1 voltage level and asserts NTC2 low (sinking ≥2.0 mA) when NTC1 falls below V_{ADC_BIT1} threshold - indicating infinite resistance. This occurs within one CLK cycle and forces immediate GATE disable and LED fault indication, satisfying IEC 60335-1 Annex G thermal fault response requirements.

Can PT8A3280CWE operate from a 3.3 V supply?

No - the absolute minimum VDD is 3.5 V per datasheet specifications. At 3.3 V, internal Zener regulation fails to stabilize, ADC accuracy degrades, and GATE drive strength drops below 10 mA, risking unreliable SCR triggering. A 5 V supply is recommended for full specification compliance.

Is the heating timer adjustable or fixed?

The timer is fixed at 216,000 CLK cycles - yielding 1.15–1.25 hours at 50 Hz and ~1 hour at 60 Hz. No external components or programming pins allow adjustment; this hardware-implemented timeout ensures deterministic, tamper-proof safety shutdown independent of firmware or external clocks.