SMM 20 Bel Fuse Inc, SMM 20 Datasheet

SMM 20

Manufacturer Part Number

SMM 20

Description

FUSE 20A M-BLOW 250V 3812 SMD

Manufacturer

Bel Fuse Inc

Series

SMMr

Datasheet

1.SMM_20.pdf (2 pages)

Specifications of SMM 20

Fuse Type

Normal Blow

Voltage - Rated

250VAC

Current

20A

Package / Case

Non-Standard SMD

Size / Dimension

0.386" L x 0.122" W x 0.122" H (9.80mm x 3.10mm x 3.10mm)

Mounting Type

Surface Mount

Operating Temperature

-55°C ~ 85°C

Dc Cold Resistance

0.003 Ohm

Melting I²t

270

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Color

Other names

507-1522-2
SMM20

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SMMD Sept.,2010

Electrical Characteristics

Approvals

Soldering Guidelines

Reflow Conditions Recommended: 240° C, 30 sec. max.

Pb-Free Process Compatibility:

When soldered to test boards using IR reflow in accordance with JEDEC

J-STD-020 (260° C, 40 sec. max.), SMM samples exhibited DCR change of

+10% to -20% from initial values.

Subsequent tests showed all samples complied with the stated electrical

characteristics on this data sheet.

NOT Recommended for Wave solder / Direct immersion / Hand Solder

Environmental Specification

Shock Resistance

MIL-STD-202G, Method 213B, Test Condition I (100 G's peak for 6 milliseconds).

Vibration Resistance

MIL-STD-202G, Method 201A (10-55 Hz, 0.06 inch, total excursion).

Salt Spray Resistance

MIL-STD-202G, Method 101E, Test condition B (48 hrs).

Thermal Shock Resistance

MIL-STD-202G, Method 107G, Test Condition B (-65° C to +125° C)

Insulation Resistance:

MIL-STD-202G, Method 302, Test Condition A

(After Opening) 10,000 ohms minimum

Solderability:

MIL-STD-202G, Method 208H

Soldering Heat Resistance:

MIL-STD-202G, Method 210F

Operating Temperature

-55° C to +85° C Max.

NOTES:

– TEST CONDITIONS

For all SMM data, as well as UL Component investigation, all tests were conducted with fuse samples soldered on a PCB (1.6mm thick) test

board with copper traces measuring 0.1 mm nominal thickness (3 oz.clad), 10mm wide and 100 mm overall length.

– UL Condition of Acceptability

The maximum temperature recorded in open air was 100

operating temperatures in end-use application with regard to thermal index of surrounding materials and components.

(Maximum temperature recorded at 80% of rating (24A) for the SMM30 rating was 69 C (48 C rise).

CAUTION:

– MINIMUM FUSING POINT :

The SMM Series fuses are NOT intended to be operated at currents between 100% and 200% of ampere rating. Prolonged operation at currents

in this range may result in overheating of the fuse and/or desoldering of the fuse caps from the PCB pad.

- the following information is contained in the UL Component Recognition for SMM Fuse Series:

Safety Agency Approvals

Recognized File No. E20624

Testing Current

100%

200%

Minimum

4 hrs

Amp range / I.R. ability @ Volt

20A - 30A / 100A@ 250V AC resistive

N/A

Type SMM

Square Ceramic Surface Mount Medium Blow Fuse

Blow Time

150A@125V AC resistive

300A@ 65V DC resistive

Maximum

C in a 21

60 sec

N/A

C ambient (79

Consult manufacturer for other ratings

Materials

Ceramic Body / Matte Tin Plated Brass Caps

Marking

On fuse:

'On label:

Packaging

2,000 fuses in 13 inches dia. reel, 16mm wide tape, 8mm pitch, per EIA Standard

481

Physical Specification

Mechanical Dimensions

Number

SMM 20

SMM 25

SMM 30

Catalog

"bel", "Current Rating" in black

"bel", "SMM", Current Rating, Voltage Rating, Interrupting Rating,

Safety Logo and "

C rise). Consideration should be given to checking

(0.12''±0.004'')

Ampere

3.1±0.1mm

Rating

20A

25A

30A

(0.12''±0.004'')

3.1±0.1mm

Typical Cold

Resistance

0.0025

0.0019

0.0013

(ohm)

3.8mm

(0.15")

","

(Volt) max. (A²Sec) min.

@100% In

Volt-drop

0.09

0.08

0.07

"(China RoHS compliant)

(0.39''±0.008'')

9.8±0.2mm

Melting I²t

(0.08''±0.008'')

5.6mm

(0.22")

@10In

2.0±0.2mm

1000

270

420

Dissipation

RoHS6 Compliant

Maximum

Power

(W)

1.8

2.0

2.1

4.1mm

(0.16")

3812 Size

Related parts for SMM 20

SMM 20 Summary of contents

Page 1

... The SMM Series fuses are NOT intended to be operated at currents between 100% and 200% of ampere rating. Prolonged operation at currents in this range may result in overheating of the fuse and/or desoldering of the fuse caps from the PCB pad. Catalog Ampere Typical Cold Number Rating Resistance (ohm) SMM 20 20A 0.0025 SMM 25 25A 0.0019 SMM 30 30A 0.0013 ...

Page 2

Type SMM Square Ceramic Surface Mount Medium Blow Fuse 100000 10000 1000 100 10 1 0.1 0.01 10 SMM - TIME CURRENT CHARACTERISTIC CURVE 20A 25A 30A 100 CURRENT IN AMPERES 3812 Size RoHS6 Compliant Pb SMMC Sept.,2010 1000 ...

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