WFH230L250J Ohmite, WFH230L250J Datasheet

WFH230L250J

Manufacturer Part Number

WFH230L250J

Description

Wirewound Resistors 230watt 250ohm 5%

Manufacturer

Ohmite

Datasheet

1.WFH90L4R7KE.pdf (1 pages)

Specifications of WFH230L250J

Resistance

250 Ohms

Tolerance

5 %

Power Rating

230 Watts

Temperature Coefficient

+/- 150 PPM / C

Dimensions

210 mm L x 12.6 mm H

Product

Power Resistors Wire Wound Aluminum Housed

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

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WFH Series

Aluminum Housed Wirewound Power

D E S I G N I N G

The following equations are applied in the dimensioning of the resistors at

stationary load. If more information is required please consult Ohmite. It is

assumed that the air around the resistors is stationary (worst case). See

ohmite.com for more examples.

1. WFH is mounted on a heat sink:

2. WFH is mounted without a heat sink:

Where:

ø2.2

MAX

AMB

*at 40°C base plate temperature

MAX

Type

WFH90

WFH160

WFH230

WFH330

Ohmite Mfg. Co.

= Maximum reguired load in resistor

= Maximum hot spot temperature reguested in resistor (T

= Ambient temperature

= Thermal resistance. Refer to table Thermal resistances

= Heat sink temperature (chassis).

= Temperature on top of the Aluminum profile.

<220°C) The lower T

A. The thermal resistance R

B. The Temperature of the Heat Sink is known,

Check that:

MAX

ø4.5

= W

4.8

Rating*

(watts)

Power

160

230

330

MAX

T = W

Check that:

MAX

Lug

terminal

x (R

1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com

= W

MAX

0.22Ω – 6.8K

TH1

Resistance

0.47Ω-18K

0.82Ω-27K

1Ω - 39K

MAX

x (R

x R

MAX

Range

+ R

(Ω)

TH4

x (R

TH4

the higher reliability and

TH2

+ T

+ R

TH1

) + T

6.3

of the heat sink is known,

+ R

AMB

)

TH3

140

210

280

<220°C

+ R

) + T

Dimension (mm)

TH1

300

2x 100 263

2x 80

39.7

) + T

<220°C

AMB

Wire

terminal

lifetime.

Amp

terminal

123

193

<220°C

MAX

Ohmite’s new flat core winding

technology allows for wire-

wound heatsinkable resistors

affording a very low profile,

and superior thermal transfer

characteristics when compared

to conventional aluminum

housed wirewound resistors.

Close mounting of heat sensi-

tive components is possible

due to only a slight rise of the

temperature on the aluminum

profile.

No heat sink compound is

required because of large

mounting surface.

F E A T U R E S

• Solder, wire and “Fast-On”

• More resistors in one profile pos-

• Custom wire lengths available

P O W E R D I S S I P A T I O N

This graph shows the maximum wattage rating for each possible resistor

of standard size corresponding to the heat sink temperature. It is as-

sumed that all resistors are equally loaded.

T H E R M A L R E S I S T A N C E S

Thermal Resistance (°C/W) between different

measuring points

Termination

sible

WFH90L4R7KE

WFH90L10RKE

WFH90L25RJE

WFH90L50RJE

WFH90L100JE

WFH90L470JE

WFH90L750JE

WFH90L1K0JE

WFH90L2K7JE

WFH90L5K0JE

WFH90 WFH160 WFH230 WFH330

S T A N D A R D P A R T N U M B E R S F O R W F H S E R I E S

6.8

0.1

0.3

350

300

250

200

150

100

Series

� � � � � � � � � � � �

40°

Check product availability at

WFH330

WFH230

WFH160

WFH90

3.9

0.05

0.17

WFH160LR47KE

WFH160L1R0KE

WFH160L2R0KE

WFH160L10RKE

WFH160L27RJE

WFH160L50RJE

WFH160L75RJE

WFH160L100JE

WFH160L150JE

WFH160L250JE

O R D E R I N G I N F O R M A T I O N

Wattage

at 40°C

base plate

temp.

60°

0.75

2.75

0.03

0.1

Heat Sink Temperature, °C

Terminal Type

L = lug terminals

A = amp terminals

W= 30cm insulated wire cable 18AWG

WFH160L1K0JE

WFH160L5K0JE

WFH160L10KJE

WFH230L1R0KE

WFH230L2R0KE

WFH230L5R0KE

WFH230L10RKE

WFH230L27RJE

WFH230L50RJE

WFH230L75RJE

80°

0.5

0.02

0.085

S P E C I F I C A T I O N S

Power rating: 90W-330W

Resistance tolerance: ±5%, ±10%

Temperature Coefficients:

Dielectric strength: 2500 VAC

Working voltage: 1200 VAC

Test voltage: 6000 VAC

Lead wire: (wire terminal version

Insulation: Silicone Rubber

www.ohmite.com

Normal: 50ppm - 150ppm

Low ohmic values: 400ppm

peak

only): XLPE, 600V, 125C, 18

AWG stranded

& Mica. The Silicone is UL-

recognised (UL 94 HB) to a

working temperature of 220°C.

Temperatures of up to 300°C can

be endured for shorter periods.

This may however cause an

expansion of the silicone rubber

with a possibility of reducing the

dielectric strength.

100°

housing to

aluminum

heat sink

Ohms

R47= 0.47Ω

WFH230L100JE

WFH230L150JE

WFH230L250JE

WFH230L1K0JE

WFH230L1K5JE

WFH230L2K5JE

WFH330L1R0KE

WFH330L2R0KE

WFH330L10RKE

WFH330L27RJE

TH 3

120°

RoHS

Compliant

wire to

aluminum

housing

Tolerance

J = 5%

K = 10%

TH 1

WFH330L50RJE

WFH330L75RJE

WFH330L100JE

WFH330L150JE

WFH330L250JE

WFH330L1K0JE

WFH330L5K0JE

WFH330L10KJE

140°

aluminum

housing

to air

TH 2

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