Specications are subject to change without notice.

Surface Mount Fuses

452/454 Series

NANO

2®

> Slo-Blo

> 452/454 Series

452/454 Series

Please refer to www.littelfuse.com/series/452.html

or /454.html for current information.

452/454 Series Fuse

Description

The NANO

Slo-Blo

fuse has enhanced inrush withstand

characteristics over the NANO

Fast-Acting fuse. The

unique time delay feature of this fuse design helps solve

the problem of nuisance “opening” by accommodating

inrush currents that normally cause a fast-acting fuse to

open.

Features

t 5JNF-BH4MP#MP

t 4NBMMTJ[F

t 8JEFSBOHFPGDVSSFOU

SBUJOHBWBJMBCMFN"

UP"

t 8JEFPQFSBUJOH

temperature range

t -PXUFNQFSBUVSF

de-rating

t 3P)4DPNQMJBOU

t )BMPHFO'SFF

Electrical Characteristics for Series

% of Ampere

Rating

Opening Time

100% 4 hours, Minimum

200% 1 sec., Min.; 60 sec., Max.

 TFD.JOTFD.BY

800% 0.02 sec., Min.; 0.1 sec., Max.

Electrical Specications by Item

Ampere

Rating

(A)

Amp Code

Max

Voltage

Rating

(V)

Interrupting

Rating

Nominal Cold

Resistance

(Ohms)

Nominal

Melting

t (A

sec)

Agency Approvals

  

BNQFSFT!7"$7%$

BNQFSFT!7%$

14&BNQFSFT!7"$

1.2000 0.101 x x

    0.240 x x

    0.904 x x

001. 001.   1.98 x x x

     xxx

2.00 002.   8.20 x x x

     xxx

    20.16 x x x

   0.0224  xxx

4.00 004.  0.0186  xxx

     xxx

  

BNQFSFT!7"$

BNQFSFT!7%$

  xx

8 008. 

BNQFSFT!7"$

BNQFSFT!7%$

0.0088  xx

12 012.  0.0061 260.46 x x

Applications

t /PUFCPPL1$

t -$%1%157

t -$%NPOJUPS

t -$%1%1QBOFM

t -$%CBDLMJHIUJOWFSUFS

t 1PSUBCMF%7%QMBZFS

t 1PXFSTVQQMZ

t /FUXPSLJOH

t 1$TFSWFS

t $PPMJOHGBOTZTUFN

t 4UPSBHFTZTUFN

t 5FMFDPNTZTUFN

t 8JSFMFTTCBTFTUBUJPO

t 8IJUFHPPET

t (BNFDPOTPMF

t 0GåDF"VUPNBUJPO

equipment

t #BUUFSZDIBSHJOHDJSDVJU

protection

t *OEVTUSJBMFRVJQNFOU

t .FEJDBMFRVJQNFOU

t "VUPNPUJWF

Agency Approvals

AGENCY AGENCY FILE NUMBER AMPERE RANGE

E10480 375mA - 12A

LR29862 375mA - 12A

NBK030205-E10480B 1A - 5A

Notes:

- l

t calculated at 8ms.

- Resistance is measured at 10% of rated current, 25ºC

Revised: May 3, 2011

Introduction to Circuit Protection

Transientology

Specications are subject to change without notice.

Surface Mount Fuses

452/454 Series

NANO

2®

> Slo-Blo

> 452/454 Series

Please refer to www.littelfuse.com/series/452.html

or /454.html for current information.

Average Time Current Curves

Reow Condition Pb – Free assembly

Pre Heat

- Temperature Min (T

s(min)

) ¡$

- Temperature Max (T

s(max)

) ¡$

- Time (Min to Max) (t

) 60 – 120 secs

Average ramp up rate (Liquidus Temp

) to peak

¡$TFDPOENBY

S(max)

to T

- Ramp-up Rate ¡$TFDPOENBY

Reow

- Temperature (T

) (Liquidus) ¡$

- Temperature (t

) 60 – 90 seconds

Peak Temperature (T

) 



¡$

Time within 5°C of actual peak

Temperature (t

)

20 – 40 seconds

Ramp-down Rate ¡$TFDPOENBY

Time 25°C to peak Temperature (T

) 8 minutes max.

Do not exceed ¡$

Wave Soldering Parameters

¡$1FBL

Temperature,

TFDPOETNBY

Soldering Parameters

Temperature Rerating Curve

Note:

 %FSBUJOHEFQJDUFEJOUIJTDVSWFJTJOBEEJUJPOUPUIFTUBOEBSEEFSBUJOHPGGPS

continuous operation.

Time

Temperature

S(max)

S(min)

time to peak temperature

(t 25ºC to peak)

Ramp-down

Ramp-up

Preheat

Critical Zone

to T

0.01

0.1

100

0.1 1 10 100 1000

TIME IN SECONDS

CURRENT IN AMPS

375mA

500mA

1.00A

1.50A

2.00A

2.50A

3.00A

3.50A

4.00A

5.00A

7.00A

750mA

8.00A

12.0A

Specications are subject to change without notice.

Surface Mount Fuses

452/454 Series

NANO

2®

> Slo-Blo

> 452/454 Series

452/454 Series

Please refer to www.littelfuse.com/series/452.html

or /454.html for current information.

Materials

#PEZ$FSBNJD

5FSNJOBUJPOT(PMEQMBUFE$BQT

4JMWFSQMBUFE$BQT

Product Marking #SBOE"NQFSF3BUJOH

Operating

Temperature

¡$UP¡$

Moisture

Sensitivity Level

-FWFM+45%$

Solderability .*-45%.FUIPE

Insulation

Resistance (after

Opening)

.*-45%.FUIPE5FTU$POEJUJPO

"PINTNJOJNVN

Thermal Shock

.*-45%.FUIPE5FTU

$POEJUJPO#DZDMFT¡$

¡$NJOVUFT!FBDIFYUSFNF

Mechanical Shock

.*-45%.FUIPE5FTU*

%FFOFSHJ[FE(TQLBNQMJUVEF

TBXUPPUIXBWFNTEVSBUJPO

DZDMFT9:;YZ[TIPDLT

Vibration

.*-45%.FUIPEw

BNQMJUVEF)[JONJOIST

FBDI9:;IST

Moisture Resistance .*-45%.FUIPEDZDMFT

Salt Spray

.*-45%.FUIPE5FTU

$POEJUJPO#IST

Resistance to Soldering

Heat

.*-45%.FUIPE5FTU

DPOEJUJPO#TFDBU¡$

Product Characteristics

1 A

6.86

(.270")

3.15

(.124")

2.95

(.116")

1.96

(.077")

2.69

(.106")

2.69

(.106")

1.45

(.057")

6.10

(.240")

Recommended pad layout

Dimensions

Packaging

Part Numbering System

Packaging Option Packaging Specication Quantity

Quantity &

Packaging Code

NN5BQFBOE3FFM &*"34*&$QBSU  /3

NN5BQFBOE3FFM &*"34*&$QBSU 1000 .3

0452 001. M R L

SERIES

AMP Code

QUANTITY Code

PACKAGING Code

.QDT

/QDT

35BQFBOE3FFM

RoHS Compliant & Halogen Free

3FGFSUP"NQ$PEFDPMVNOJOUIF

&MFDUSJDBM4QFDJåDBUJPOTUBCMF

The dot is positioned at the end of the

number sequence with whole ratings

and within for fractional ratings.

Example:"NQQSPEVDUJT

.375.3-BNQQSPEVDUTIPXO

NOTE: “L” sufx applies to 452 series only

 TFSJFT NBZ CF PSEFSFE BT FJUIFS i3P)4 BOE )'w i-w TVGåY PS OPO3P)4 OP

TVGåYWFSTJPO

TFSJFTJTBWBJMBCMFPOMZBTi3P)4BOE)'wWFSTJPOBOEEPFTOPUSFRVJSFi-wTVGåY

1MFBTFEPOPUJODMVEFi-wTVGåYXJUIJOTFSJFTPSEFSJOHJOTUSVDUJPOT

Part #	045402.5MR
Description	Fuse Chip Slow Blow Acting 2.5A 125V SMD Solder Pad 2410 C
Category	FUSE
Availability	In Stock
Qty	1000

Qty	Price
1 - 210	$0.58109
211 - 420	$0.46223
421 - 630	$0.43582
631 - 840	$0.40500
841 +	$0.36098

045402.5MR

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