DataSheet476 Series

Samples476 Series

Design Guide

DataSheet470 Series

Samples470 Series

Design Guide

NANO2® Fast-Acting Subminiature Surface Mount Fuses

Surface Mount AC Fuses for Compact

Applications 470 & 476 Series

Smallest 125VAC fuse (470 Series with 1206 footprint) and 250VAC fuse

(476 Series with 2410 footprint) to occupy less board space

Applications

• LED Lighting

• LCD/LED TVs

• Notebooks/PCs

• White Goods

• Gaming Consoles

• Power Supply Units

AC SMT FUSES 125/250vAC

SMALLEST

With a 1206 footprint, the 470 Series is the smallest 125VAC-rated fast-acting fuse in the Littelfuse SMT fuse portfolio. This series exhibits high breaking capacity with unparalleled surge

tolerance. It’s suitable for protecting compact applications against overload conditions.

The 476 Series is a family of 250VAC-rated surface mountable fuses in a very small 2410 footprint. It is the smallest fuse with this high voltage rating from the Littelfuse SMT fuse portfolio. It’s designed mainly to serve as primary side circuit protection

for compact applications with high voltage requirements.

littelfuse.com© 2015 Littelfuse • 470 & 476 Series NANO2® Fast-Acting Subminiature Surface Mount Fuse

The 470 Series is designed to provide circuit protection for compact applications or as direct replacement to the standard 2410 Fuses. The platform itself is a breakthrough, eliminating the use of internal solders, which makes it 100% lead-free.

The 476 Series is the smallest SMT fuse with 250V voltage rating offered in the Littelfuse SMT fuse portfolio. It is designed to serve as the primary side circuit protection for compact devices with high voltage requirement.

Example of a 470 Series Fuse used in an LED Bulb

SMALLESTAC SMT FUSES

125/250vAC

NANO2® Fast-Acting Subminiature Surface Mount Fuses

The smallest 125VAC- and 250VAC-rated SMT fuses with 1206 and 2410 footprints

Features • Surface Mount Type AC fuse

• Smallest footprint

• 470 Series – 1206

• 476 Series – 2410

• High operating temperature at 125°C

• Surge Immunity Capability

• 470 Series – US: ENERGY STAR® 1

(1.5A and above ampere rating only)

• 476 Series – Global: IEC 61000-4-5 2 ed.

(3A and above ampere rating only)

• RoHS compliant and halogen-free

Benefits • SMT is the future trend for compact applications with

space constraints; it also enables higher speed and yield

in manufacturing processes

• Occupies less board space

• Suitable for high temperature applications such as LED

lighting

• Withstands surge from AC power line and keeps LED

light bulb/tube working continuously

476 Series

470 Series

470 vs 476 Comparison 470 Series 476 Series

voltage 125Vac 250Vac

Current 0.5A~2A 1A~15A

Footprint 1206 2410

Interrupting 50A 100A

Surge WithstandingENErgy StAr®, ring

wave, 2.5kV (1.5A rating and above)

IEC61000-4-5 2 ed., CombinationWave

500V/250A (3A rating and and above)

Operating Temperature -55°C to 125°C -55°C to 125°C

Surface Mount FusesAC/DC Board

(Power Supply & Driver)

LED Board AC LED Board (All SMT Components)

DC-DC ConverterLine Rectifier

Controller /Opto Couplers

EMI FilterAC Input

L

N

G

High VoltageDC Fuse

Constant Current LED String Driver

LEDs

Iso / Step Down

Osc.

A fuse with adequate I2t rating is necessary to pass ENERGY STAR® ring-wave tests according to IEEE C.62.41.2

A metal oxide varistor (MOV)can help protect the LED bulbfrom overvoltage surges andring-wave effectes by clampingshort-duration voltage impulses.

A TVS Diode on the dc sidecan be used to protect againsttransients before entry intoconverter circuit.

Open circuit LED protection device

TVS DiodeTransient protection for energy let through to the LED circuit

A positive temperature coefficient resistor can help protect LEDs from over-current and over-temperature.

AC Line Fuse MOV TVS Diode PTC PLED

Indoor LED luminaire circuit

1 ENERGY STAR® is a registered trademark for the Department of Energy