Littelfuse 242 Series Manual do Utilizador descarregar pdf (Página 2)

© 2014 Littelfuse, Inc.

Speciﬁcations are subject to change without notice.

Revised: 01/23/14

Special Application Fuses

242 Series Barrier Network Fuse

Average Time Current Curves

0.1

0.01

0.001

0.0001

1

10

100

TIME IN SECONDS

.050A

.080A

.100A

.200A

.125A

.160A

.250A

0.01 0.1 110 100 1000

CURRENT IN AMPERES

Reﬂow Condition Pb–Freeassembly

Pre Heat

- Temperature Min (T

s(min)

) 150°C

- Temperature Max (T

s(max)

) 200°C

- Time (min to max) (t

s

) 60 – 180 secs

Average ramp up rate (Liquidus Temp

(T

L

) to peak

5°C/second max

T

S(max)

to T

L

- Ramp-up Rate 5°C/second max

Reﬂow

- Temperature (T

L

) (Liquidus) 217°C

- Temperature (t

L

) 60 – 150 seconds

Peak Temperature (T

P

) 250

+0/-5

°C

Time within 5°C of actual peak Temp. (t

p

) 20 – 40 seconds

Ramp-down Rate 5°C/second max

Time 25°C to peak Temperature (T

P

) 8 minutes Max.

Do not exceed 260°C

Soldering Parameters

Product Characteristics

Dimensions

3.02mm

(.119")

8.40mm

(.331")

4.00mm

4.60mm

(.181")

1.90mm

(.075")

3.02mm

(.119")

8.40mm

(.331")

4.60

mm

(.181")

2.90mm

3.20mm

9.80mm

1.90

mm

(.075")

.635mm

(.025")

Operating Temperature –40

O

C to 125

O

C.

Thermal Shock

Withstands5cyclesof–55

O

C to

125

O

C

Vibration Per MIL-STD-202F

Insulation Resistance

(After Opening)

Greater than 10,000 ohms.

Part Numbering System

0242.050UAT1

SERIES

AMP CODE

QUANTITY & PACKAGING CODE

RefertoAmpCodecolumninthe

ElectricalSpecicationstable.

HAT1=100pcs,AxialLeaded,AmmoPackT1Tape

UAT1=500pcs,AxialLeaded,AmmoPackT1Tape

UR=500pcs,SurfaceMount,Tape&Reel

Wave Soldering 260°C, 10 seconds max.

Time

Temperature

T

P

T

L

T

S(max)

T

S(min)

25

t

P

t

L

t

S

time to peak temperature

(t 25ºC to peak)

Ramp-down

Ramp-up

Preheat

Critical Zone

T

L

to T

P

1 2

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