Current Sense Resistor Datasheet

© 2024 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: GD. 10/29/24

4

Two-Terminal Surface Mount Resistor

WPA/B/C Series

Temperature De-rating Curve

Storage / Environment Conditions

Time

TP

TL

TS(max)

TS(min)

25

tP

tL

tS

time to peak temperature

Preheat

Preheat

Ramp-up

Ramp-up

Ramp-down

Ramp-dow

Critical Zone

TL to TP

Critical Zone

TL to TP

Profile Feature

Pb-Free Assembly

Average Ramp-Up Rate (Tsmax to Tp) 3 ºC / second max

Preheat

Temperature Minimum (Tsmin)

150 ºC

Temperature Maximum (Tsmax)

200 ºC

Time (Tsmin to (Tsmax)

60–180 seconds

Time maintained above

Temperature Minimum (TL)

Time (tL)

217 ºC

60–150 seconds

Peak Temperature (TP)

260 +0 ºC

Time within 5 ºC of

Actual Peak Temperature (tp)

20–40 seconds

Ramp-Down Rate

6 ºC / second Maximum

Time 25 ºC to Peak Temperature

8 minutes Maximum

Soldering Parameters–Wave Soldering

Products should be stored under the following environmental

conditions.

Temperature:

+5 to +35 °C

Humidity:

45 to 85% relative humidity

Moisture Sensitivity Level: 1, J-STD-020

Do not keep products in environments where they may be subject

to particulate contamination or harmful gases such as sulfuric acid

or hydrogen chloride as it may cause oxidization on electrodes,

resulting poor solderability.

Products should be stored in a space that does not expose to high

temperatures, vibration, or direct sunlight.

Products should be stored in the original airtight packaging

until use.

-55

0

0

20

40

60

80

100

40

Ambient Temperature (ºC)

70

80

120

160

170

200