rev.03/2006A

UAL Series

Specification

Value

Tolerances

±0.01%to±10%(1%Standard)

Temperature Coefficient

>10W:±20ppm/K

1Wto10W:±50ppm/K

<1W:CallFactory

TemperatureRange

-55°Cto+275°C

DielectricStrength

1500VAC

Constuction

Centerlessgroundceramiccore

Tinnedcopperorcopperweldleads

High-temperatureepoxymoldingCompound

Anodizedaluminumhousing

Allweldedterminations

EnvironmentalPerformance

(MIL-STD202)

D

R

Dielectric

±0.2%+0.05W

LoadLife

±1%+0.05W

Storage

±0.2%+0.05W

MoistureResistance

±0.2%+0.05W

ThermalShock

±0.2%+0.05W

5XOverload(5s)

±0.2%+0.05W

Shock

±0.1%+0.05W

Vibration

±0.1%+0.05W

AluminumHousedWirewoundResistors

PowerDeratingCurve

Free-air Derating

A : UAL-5, UAL-10

B : UAL-25

C : UAL-50, UAL-100, UAL-250

D : UAL-300

0

50

100

150

200

250

300

350

0

20

40

60

80

100

120

AmbientTemperature(°C)

Mounted

on

Heatsink

A

B

C

D

Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom.

+ 44 (0) 1342 835234

+ 44 (0) 1342 834306

info@willow.co.uk

http://www.willow.co.uk