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Radial Lead Fuses

MICRO™ > Very Fast-Acting Fuse > 272/273/274/278/279 Series

272/273/274/278/279 Series, MICRO

™

Very Fast-Acting Fuse

Description

QPL

Developed originally for the U.S. Space Program,

MICRO™ fuse provides reliability in a compact design.

The MICRO™ fuse is available in plug–in or radial lead

styles and a complete range of ampere ratings from

0.002A to 5A to suit a wide variety of design needs.

Features

• Military grade available

• High breaking capacity

Agency Approvals

Agency

Agency File Number

Ampere Range

• Available from very low

ampere of 0.002A to 5A

• Clear cover option to view • Plug-in with short or long

leads option

fuse element status

Applications

• Printed circuit boards

and similar equipment

Electrical Characteristics

% of Ampere

Rating

100%

200%

Ampere Rating

Opening Time

4 Hours,

Min.

5 Seconds,

Max.

2 Seconds,

Max.

E10480

29862

0.002A

- 5A

0.002A

- 5A

0.002A

- 5A

• Electronic components

QPL

FM02

0.002

– 5

0.002

– 0.3

0.4 - 5

Electrical Characteristics

Ampere

Rating

(A)

.002

.005

.010

.015

.031

.050

.062

.100

.125

.200

.250

.300

.400

.500

.600

.700

.750

.800

1.00

01.5

2.00

3.00

*4.00

*5.00

Amp Code

(for all

above

series)

.002

.005

.010

.015

.031

.050

.062

.100

.125

.200

.250

.300

.400

.500

.600

.700

.750

.800

001.

01.5

002.

003.

004.

005.

Max

Voltage

Rating

(V)

125

Interrupting

Rating

Nominal

Cold

Resistance

(Ohms)

2200

280

80.0

44.0

16.0

3.52

2.55

1.38

1.0

2.30

1.75

1.25

0.227

0.167

0.430

0.324

0.293

0.271

0.0880

0.0578

0.0425

0.0275

0.0202

0.0156

Nominal

Melting

t (A

sec)

0.00000000845

0.0000000766

0.000000462

0.00000123

0.00000810

0.0000666

0.000115

0.000385

0.000691

0.00409

0.00640

0.00945

0.0251

0.0716

0.0411

0.0710

0.0563

0.113

0.0648

0.160

0.300

0.759

1.38

2.21

Agency Approvals

QPL

10,000A@125VAC/VDC

* The fuses of 4A and 5A for 272 and 278 Series are obsolete.

Specifications are testing to change recommended.

Specifications are subject to change without notice. Application subject is strongly without notice.

Revised: 01/26/18

Radial Lead Fuses

MICRO™ > Very Fast-Acting Fuse > 272/273/274/278/279 Series

Temperature Re-rating Curve

Average Time Current Curves

1/200 A

1/100 A

1/64 A

100

TIME IN SECONDS

0.1

Note:

1. Rerating depicted in this curve is in addition to the standard derating of 25% for

continuous operation.

0.01

0.001

0.005

1/2 A

3/4 A

1 1/2 A

1/32 A

1/16 A

1/8 A

1/4 A

0.01

0.1

CURRENT IN AMPERES

100

Soldering Parameters - Wave Soldering

300

280

260

240

220

200

180

160

140

120

100

110

120

130

140

150

160

170

180

190

200

210

220

230

240

Recommended Process Parameters:

Wave Parameter

Preheat:

(Depends on Flux Activation Temperature)

(Typical Industry Recommendation)

Temperature (°C) - Measured on bottom side of board

Lead-Free Recommendation

Temperature Minimum:

Temperature Maximum:

Preheat Time:

Solder Pot Temperature:

Solder Dwell Time:

100

150

60-180 seconds

260

C Maximum

2-5 seconds

Recommended Hand-Solder Parameters:

Solder Iron Temperature: 350° C +/- 5°C

Heating Time: 5 seconds max.

Note: These devices are not recommended for IR or

Convection Reflow process.

Time (Seconds)

Preheat Time

Dwell Time

Cooling Time

Specifications are subject to change without notice.

Revised: 01/26/18

Radial Lead Fuses

MICRO™ > Very Fast-Acting Fuse > 272/273/274/278/279 Series

Product Characteristics

Operating Temperature:

Fuses to MIL SPEC

273 and 279: –55ºC to +85ºC;

272 and 278: –55ºC to +125ºC

Military QPL type (FM02).

To order, change 273 to 274.

272 and 278 series cap:

Nickel Plated Brass

Materials

273, 274 and 279 series cap:

Mirror polished Polycarbonate

Base: R-4 Ryton

Pins: Tin Plated Copper

Current and voltage ratings stamped

on cap

Dimensions

272 000 Series

(Short Lead, Metal Cap)

5.97

(.235")

7.30

(.29")

(.17")

4.32

2.54 (.10")

278 000 Series

(Long Lead, Metal Cap)

5.97

(.235")

7.30

(.29")

25.4 (1.0")

2.54 (.10")

Product Marking

Part Numbering System

0273 xxxx V

Series

Amp. Code

Refer to Amp Code column of

Electrical Characteristics Table

273 000 and 274 000 Series

(Short Lead, Clear Plastic Cap)

6.35

(.25")

8.89

(.35")

(.17")

4.32

2.54 (.10")

Packaging Code

V=5

H = 100

279 000 Series

(Long Lead, Clear Plastic Cap)

6.35

(.25")

8.89

(.35")

25.4 (1.0")

2.54 (.10")

Additional Information

Datasheet

272 Series

Resources

272 Series

Samples

272 Series

NOTE: Amperage and voltage rating stamped on cap.

Leads are tin plated copper; .025" diameter.

Packaging

Datasheet

273 Series

Resources

273 Series

Samples

273 Series

Packaging

Option

Bulk

Packaging

Specification

N/A

Quantity

Quantity &

Packaging

Code

100

Datasheet

274 Series

Resources

274 Series

Samples

274 Series

Bulk

*Only V-pack version for low current rating from 0.002 - 0.062 (A)

and for 274, 278, 279 Series

Datasheet

278 Series

Resources

278 Series

Samples

278 Series

Datasheet

279 Series

Resources

279 Series

Samples

279 Series

Disclaimer Notice

Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and

test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete

Disclaimer Notice at:

www.littelfuse.com/disclaimer-electronics.

Specifications are subject to change without notice.

Revised: 01/26/18