0437SWR datasheet(2/4 Pages) LITTELFUSE

2 / 4 page

Introduction to Circuit Protection

Transientology

Specifications are subject to change without notice.

Surface Mount Fuses

Please refer to www.littelfuse.com/series/437.html for current information.

437 Series

Ceramic Fuse > 437 Series

Average Time Current Curves

0.001

0.01

0.1

100

0.1

100

CURRENT IN AMPERES

Reflow Condition

Pre Heat

-Temperature Min (T

s(min))

150°C

-Temperature Max (T

s(max))

200°C

-Time (Min to Max) (t

Average Ramp-up Rate (LiquidusTemp

L) to peak)

3°C/second max.

S(max) to TL - Ramp-up Rate

5°C/second max.

Reflow

-Temperature (T

L) (Liquidus)

217°C

-Temperature (t

PeakTemperature (T

260+0/-5 °C

Time within 5°C of actual peak

Temperature (t

Ramp-down Rate

6°C/second max.

Time 25°C to peakTemperature (T

8 minutes max.

Do not exceed

260°C

Soldering Parameters

Temperature Rerating Curve

100

120

140

-65

-45

-25

-5

115

135

155

TEMPERATURE (°C)

Time

TS(max)

TS(min)

time to peak temperature

(t 25ºC to peak)

Ramp-down

Ramp-up

Preheat

Critical Zone

TL to TP

For continuous operation at 75 degrees celsius, the fuse should be rerated as follows:

I = (0.80)(0.85)I

RAT = (0.68)IRAT

Note:

1. Rerating depicted in this curve is in addition to the standard rerating of 20% for

continuous operation.

Wave Soldering

260°C, 10 seconds max.

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