onsemi MC33262DG

Overview

MC33262DG from onsemi is a critical-conduction-mode (CRM) active power factor controller IC designed for off-line boost preconverters in electronic ballasts and universal-input AC-DC power supplies. It integrates a transconductance error amplifier (100 mho typ), one-quadrant multiplier, zero-current detector, undervoltage lockout (13 V turn-on, 8 V shutdown), and totem-pole MOSFET gate driver with high-state clamp. It enables near-unity power factor (>0.989) in 90–268 Vac input applications up to 450 W.

For engineers reviewing the MC33262DG datasheet, pinout, applications, or equivalent options, this page delivers verified functional identity, validated SOIC-8 pin mapping, confirmed CRM control architecture, real-world PFC performance data (e.g., THD < 4.6% at 138 Vac), and two rigorously cross-referenced alternative controllers for design continuity.

Technical Context

The MC33262DG implements critical conduction mode (CRM) current-mode control without an external oscillator-startup and restart timing are handled by an internal watchdog timer (620 s typical delay). Its core signal path uses a voltage-controlled current source (error amp output) multiplied by rectified line voltage (Pin 3) to dynamically set the current-sense threshold (Pin 4), forcing sinusoidal input current draw.

Protection is hardware-integrated: overvoltage comparator (1.08 × V_FB) disables switching within 400 ns; zero-current detector (1.6 V threshold, 200 mV hysteresis) initiates each switching cycle; and UVLO (6.0 V hysteresis) ensures stable operation across −40°C to +105°C ambient.

Key Specifications

Pinout & Package

MC33262DG is housed in an 8-pin SOIC package (Case 751, D Suffix), surface-mount compatible with standard reflow profiles and rated for 450 mW max power dissipation at 70°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar active power factor correction applications.

Compared with UCC3817D and NCP1653ADR2G, the MC33262DG offers superior integration for universal-input CRM designs-its internal timer, quickstart circuit, and 16 V gate-clamp reduce BOM count and improve robustness in cost-sensitive industrial and lighting applications.

Availability

MC33262DG is available at Aetrix Electronics and suitable for electronic ballasts, universal-input AC-DC power supplies, LED drivers, and medical equipment power modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MC33262DG 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and logic solutions for automotive, industrial, cloud, and IoT applications.

The MC33262DG belongs to onsemi's Power Factor Controller product line, engineered specifically for cost-effective, high-reliability CRM-based active PFC in universal-input offline power converters targeting lighting, industrial, and medical end equipment.

FAQ

What is the operating temperature range of the MC33262DG?

The MC33262DG is specified for operation from −40°C to +105°C ambient temperature. This extended range supports deployment in industrial power supplies, outdoor LED drivers, and medical equipment where thermal stress and environmental extremes are design constraints. The device maintains parameter stability-including error amp transconductance, zero-current detect threshold, and UVLO hysteresis-across this full range, as validated in Figures 4–10 of the official datasheet.

Does the MC33262DG require an external oscillator?

No, the MC33262DG does not require an external oscillator. It uses an internal watchdog timer to generate restart pulses and relies on zero-current detection to initiate each switching cycle in critical conduction mode. This eliminates oscillator components, reduces BOM count, and avoids timing drift issues associated with external RC networks-making the MC33262DG ideal for compact, low-cost PFC preconverter designs.

How does the MC33262DG achieve near-unity power factor?

The MC33262DG achieves near-unity power factor by combining a one-quadrant multiplier (Pin 2 and Pin 3 inputs) with zero-current detection to enforce critical conduction mode. The multiplier scales the current-sense threshold proportionally to the instantaneous rectified line voltage, forcing the MOSFET on-time to track the line haversine. This results in sinusoidal input current draw with measured PF >0.989 and THD <4.6% across 90–268 Vac, as documented in the application circuits on pages 11–12 of the datasheet.

What protection features are built into the MC33262DG?

The MC33262DG integrates six hardware protection features: (1) overvoltage comparator (1.08 × V_FB, 400 ns response), (2) undervoltage lockout (13 V turn-on, 8 V shutdown, 5.0 V hysteresis), (3) cycle-by-cycle current limiting via Pin 4, (4) multiplier output clamp limiting peak switch current, (5) RS latch for single-pulse metering, and (6) drive output high-state clamp (16 V) for MOSFET gate protection. All operate autonomously without software or external supervision.

Can the MC33262DG be used in place of the MC34262P?

Yes, the MC33262DG is the industrial-grade, extended-temperature (−40°C to +105°C) surface-mount variant of the same functional family as the MC34262P (commercial-grade, 0°C to +85°C, PDIP-8). Both share identical electrical specifications, pinout, block diagram, and application circuits. The MC33262DG replaces the MC34262P in designs requiring wider temperature range, RoHS compliance, and SOIC packaging-no schematic or layout changes are needed beyond footprint adaptation.