SMMD Sept.,2010

Catalog

Number

Ampere

Rating

Typical Cold

Resistance

Volt-drop

@100% In

Melting I²t

@10In

Maximum

Power

(ohm)

(Volt) max. (A²Sec) min.

Dissipation

(W)

SMM 20

20A

0.0025

0.09

270

1.8

SMM 25

25A

0.0019

0.08

420

2.0

SMM 30

30A

0.0013

0.07

1000

2.1

Electrical Characteristics

Minimum

Maximum

100%

4 hrs

N/A

200%

N/A

60 sec

Approvals

Safety Agency Approvals

Physical Specification

Materials

Soldering Guidelines

Ceramic Body / Matte Tin Plated Brass Caps

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

Marking

Pb-Free Process Compatibility:

NOT Recommended for Wave solder / Direct immersion / Hand Solder

Packaging

Environmental Specification

Shock Resistance

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

Mechanical Dimensions

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

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.

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.

On fuse:

"bel", "Current Rating" in black

Amp range / I.R. ability @ Volt

Blow Time

Testing Current

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

150A@125V AC resistive

300A@ 65V DC resistive

Recognized File No. E20624

Consult manufacturer for other ratings

'On label:

"

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

Safety Logo and "

","

"(China RoHS compliant)

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

481

Type SMM

Square Ceramic Surface Mount Medium Blow Fuse

3812 Size

RoHS6 Compliant

Pb

2.0±0.2mm

(0.08''±0.008'')

3.8mm

(0.15")

5.6mm

(0.22")

9.8±0.2mm

(0.39''±0.008'')

3.1±0.1mm

(0.12''±0.004'')

3.1±0.1mm

(0.12''±0.004'')

4.1mm

(0.16")