Website: www.belfuse.com

ORDERING INFORMATION SEE PAGES 67 & 68

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SMP Surface Mount Power Cross Protection Fuses are primarily intended

for use in telecommunication circuit applications requiring low current

protection with high surge tolerance.They are typically used to replace heat coil

type devices.They are designed to be placed between the line input and the surge

arresting components (mov. gas tube, zenor diode, air gaps, etc.)

These fuses will withstand transient surge currents generated by lightning in

accordance with the attached table.

SMP Fuses guard protected circuitry against sustained overload or short

circuit conditions. Such sustained overloads may be generated by accidental

contact between utility cables and phone lines (power line cross).

SMP Fuse are used in circuits to obtain compliance with the test

requirements specified in UL 1950/60950 and Bellcore GR 1089.

Approvals

Environmental Specification

Soldering Techniques & Compatability

Reflow: Industrial standard, 240

°C peak

Shock

MIL-STD-202, Method 213, Test Condition I (100 G’s peak for

6 milliseconds)

Vibration

MIL-STD-202, Method 201 (10-55 Hz, 0.06 inch, total

excursion)

Salt Spray

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

Insulation Resistance

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

(After Opening) 10,000 ohms minimum

Solderability

MIL-STD-202, Method 208

Resistance to solder Heat

MIL-STD-202, Method 210,Test Condition J (235

°C, 30 sec)

Consult manufacturer for other ratings

Mechanical Dimensions

Type SMP

Surface Mount Power Cross Protection Fuse

SMPD0104

Physical Specification

Materials

Ceramic Body / Tin Plated Brass Caps

Lead Free Solder

Marking

On fuse: “bel”, “Current Rating”

On label: Above info; “Type”, “Voltage Rating”, “Appropriate Safety Logos”

Interrupting Rating plus “

c“

Packaging

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

per EIA standard 481

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SMP 1.25 Surge Withstand Ratings

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bel 1.25

3.05 ± 0.13mm

(0.120" ± 0.005")

3.05 ± 0.13mm

(0.120" ± 0.005")

2.03 ± 0.10mm

(0.080" ± 0.004")

9.65 ± 0.25mm

(0.38" ± 0.01")

3.81mm

(0.15")

4.06mm

(0.16")

5.08mm

(0.20")

Recommended pad layout

SMP

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Thermal Shock

MIL-STD-202, Method 107,Test Condition B (-65

°C to +125°C)

Operating Temperature

-55

°C to +125°C

Power Cross (Telecom) Rating

(Fuse Rated 0.1-1.5A)

19

Waveform Duration Of A/B Seconds

Current

Time

T2

T1

0.1 lp

0.9 lp

b

TO

a

(Peak Value) lp

0.5 lp

A = Rise Time = T1-T0 (1.25(b-a)

B = Duration = T2-T0

Double-exponential

Impulse Waveform

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