onsemi NCP4305DMNTWG

Mfr. Part

NCP4305DMNTWG

Manufacturer

AMI Semiconductor onsemi

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Detailed Description

Secondary-side synchronous rectifier controller and driver for flyback and related power supplies. Replaces the secondary diode with a driven MOSFET to cut conduction losses and boost efficiency. Wide supply up to 35 V, robust operation from -40 to 125 C, and surface-mount 8-DFN with exposed pad for better thermal performance. Designed to sense the rectifier MOSFET and switch it optimally to avoid reverse current, false turn-on, and ringing. Ideal for DCM and quasi-resonant flyback designs used in adapters, chargers, LED drivers, and auxiliary rails.

Key Features

Wide supply range up to 35 V

Secondary-side controller for synchronous rectification

Fast gate driver for external N-channel MOSFET

Adaptive control to prevent reverse current and false turn-on

Optimized for DCM and quasi-resonant flyback topologies

Low standby loss and high overall efficiency

Operating temperature range -40 C to 125 C

Surface mount 8-DFN 4 x 4 mm with exposed thermal pad

RoHS3 compliant

Tape and Reel packaging for automated SMT lines

Base product number NCP4305

Supplier device package 8-DFN 4x4

Key Advantages

Higher efficiency than Schottky diode rectification

Lower heat in the secondary stage for cooler designs

Better light-load behavior and lower standby power

Compact footprint with strong thermal dissipation via exposed pad

Helps meet energy-efficiency regulations with margin

Simplifies design of high-density adapters and chargers

Packaging

Shipment type Tape and Reel TR for high-volume assembly

Package case 8-DFN 4 x 4 and 8-VDFN with exposed pad

Material copper leadframe with epoxy mold compound and matte tin lead finish

Size low profile 4 mm x 4 mm body suited for compact PCBs

Mounting type surface mount SMT

Pin configuration 8 pins plus exposed pad typical pins include Gate VCC GND Drain sense Source sense Enable refer to datasheet for exact pinout

Thermal characteristics exposed pad improves heat flow and reduces junction temperature use ample copper area under pad and thermal vias for best results

Electrical properties supply up to 35 V strong gate drive optimized for synchronous rectification UVLO and protection features per datasheet

Lifecycle

Status active production and widely used not nearing discontinuation based on latest available information

Same-family alternatives onsemi NCP4303 NCP4304 NCP4306 chosen by topology and control needs

Cross-vendor options Texas Instruments UCC24610 UCC24612 UCC24624 and other secondary-side SR controllers

For precise drop-in equivalence and up-to-date lifecycle status contact the Y-IC sales team via our website We will review your design and recommend the best equivalent or improvement

Key Application Areas

AC DC adapters and USB wall chargers

Phone tablet and laptop power supplies

LED lighting drivers using flyback topology

Set-top boxes routers and home appliances auxiliary supplies

Industrial and embedded flyback converters

Standby and auxiliary rails in server and telecom equipment

Datasheet

Y-IC hosts the most authoritative datasheet for this product model on our website Download it now from this page to get full specifications pinout application notes and design guidelines

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