参数资料
| 型号： | WFH330L75RJE |
| 厂商： | Ohmite |
| 文件页数： | 1/1页 |
| 文件大小： | 0K |
| 描述： | RES ALUM HOUSED WW 75 OHM 330W |
| 标准包装： | 1 |
| 系列： | WFH |
| 电阻（欧姆）： | 75 |
| 功率（瓦特）： | 330W |
| 复合体： | 绕线 |
| 容差： | ±5% |
| 涂层，外壳类型： | 铝 |
| 安装特点： | 法兰 |
| 尺寸/尺寸： | 11.024" L x 2.008" W（280.00mm x 51.00mm） |
| 高度： | 0.496"（12.60mm） |
| 引线型： | 焊片 |
| 包装： | 散装 |
| 封装/外壳： | 径向，矩形外壳 |
L
0.8
?4.5
A
WFHSeries
Aluminum Housed Wirewound Power
12.6
6.3
13.6
41 51
B
10
300
8
Amp
terminal
15
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.
FEATURES
? SOLDER, WIRE AND “FAST-ON”
TERMINATION
? MORE RESISTORS IN ONE PROFILE POS-
sible
? CUSTOM WIRE LENGTHS AVAILABLE
POWER DISSIPATION
SPECIFICATIONS
Power rating: 90W-330W
Resistance tolerance: ±5%,
±10%
Temperature Coefficients:
Normal: 50PPM - 150PPM
Low ohmic values: 400PPM
Dielectric strength: 2500 VAC
PEAK
Working voltage: 1200 VAC
Test voltage: 6000 VAC
Lead wire: (WIRE TERMINAL VERSION
ONLY): XLPE, 600V, 125C, 18
AWG STRANDED
Insulation: SILICONE RUBBER
& 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 PERI-
ODS. THIS MAY HOWEVER CAUSE AN
EXPANSION OF THE SILICONE RUBBER
WITH A POSSIBILITY OF REDUCING THE
DIELECTRIC STRENGTH.
?2.2
4.8
0.6
6
350
300
250
200
150
100
50
WFH330
WFH230
WFH160
WFH90
THIS GRAPH SHOWS THE
MAXIMUM WATTAGE RAT-
ING FOR EACH POSSIBLE
RESISTOR OF STANDARD SIZE
CORRESPONDING TO THE HEAT
SINK TEMPERATURE. IT IS
ASSUMED THAT ALL RESISTORS
ARE EQUALLY LOADED.
Thermal Resistance (°C/W) between different
surface to
measuring points
heat sink
R TH2
R TH 1
R TH 2
R TH1
R TH 3
R TH 4
0.3
0.17
0.1
0.085
Lug
terminal
Power Resistance
Rating* Range
Type (watts) ( Ω )
WFH90 90 0.22 Ω – 6.8K
WFH160 160 0.47 Ω -18K
WFH230 230 0.82 Ω -27K
WFH330 330 1 Ω - 39K
*at 40°C base plate temperature
Wire
terminal
Dimension (mm)
A B L
70 39.7 53
140 80 123
210 2x 80 193
280 2x 100 263
0
40 ° 60 ° 80 ° 100 ° 120 ° 140 °
Heat Sink Temperature, ° C
THERMAL RESISTANCES
resistor
R TH4 to air
WFH90 WFH160 WFH230 WFH330
2 1 0.75 0.5
6.8 3.9 2.75 2
0.1 0.05 0.03 0.02 R TH3 wire to
aluminum aluminum
housing to housing
heat sink
O R D E R I N G I N F O R M AT I O N
aluminum
housing
????????????
Series Wattage Terminal Type Ohms
at 40 ° C
R47= 0.47 ?
K = 10%
DESIGNING
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:
A. THE THERMAL RESISTANCE R TH OF THE HEAT SINK IS KNOWN,
T = W MAX X (R TH4 + R TH )
CHECK THAT:
T MAX = W MAX X (R TH + R TH3 + R TH1 ) + T AMB <220°C
B. THE TEMPERATURE OF THE HEAT SINK IS KNOWN,
T = W MAX X R TH4 + T H
CHECK THAT:
T MAX = W MAX X (R TH1 + R TH3 ) + T H <220°C
2. WFH is mounted without a heat sink:
CHECK THAT:
T MAX = W MAX X (R TH1 + R TH2 ) + T AMB <220°C
Where:
W MAX = MAXIMUM REGUIRED LOAD IN RESISTOR
T MAX = MAXIMUM HOT SPOT TEMPERATURE REGUESTED IN RESISTOR (T MAX
<220°C) THE LOWER T MAX THE HIGHER RELIABILITY AND LIFETIME.
T AMB = AMBIENT TEMPERATURE
R TH = THERMAL RESISTANCE. REFER TO TABLE THERMAL RESISTANCES
T H = HEAT SINK TEMPERATURE (CHASSIS).
T = TEMPERATURE ON TOP OF THE ALUMINUM PROFILE.
RoHS
Compliant
Tolerance
J = 5%
L = lug terminals
base plate A = amp terminals
temp. W= 30cm insulated wire cable 18AWG
THIS PRODUCT IS DESIGNED FOR
USE WITH PROPER HEATSINKING.
Maximum base plate temperature of the resistor must be monitored
and kept within specified limits to establish the power rating. Best
technique is to attach a thermocouple to the side of the base plate of
the resistor. Temperature of plastic housing or heat sink cannot be
used to establish rating of the resistor.
S TA N D A R D PA RT N U M B E R S F O R W F H S E R I E S
WFH90L4R7KE WFH160LR47KE WFH160L1K0JE WFH230L100JE WFH330L50RJE
WFH90L10RKE WFH160L1R0KE WFH160L5K0JE WFH230L150JE WFH330L75RJE
WFH90L25RJE WFH160L2R0KE WFH160L10KJE WFH230L250JE WFH330L100JE
WFH90L50RJE WFH160L10RKE WFH230L1R0KE WFH230L1K0JE WFH330L150JE
WFH90L100JE WFH160L27RJE WFH230L2R0KE WFH230L1K5JE WFH330L250JE
WFH90L470JE WFH160L50RJE WFH230L5R0KE WFH230L2K5JE WFH330L1K0JE
WFH90L750JE WFH160L75RJE WFH230L10RKE WFH330L1R0KE WFH330L5K0JE
WFH90L1K0JE WFH160L100JE WFH230L27RJE WFH330L2R0KE WFH330L10KJE
WFH90L2K7JE WFH160L150JE WFH230L50RJE WFH330L10RKE
WFH90L5K0JE WFH160L250JE WFH230L75RJE WFH330L27RJE
34
Ohmite Mfg. Co. 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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| WFH330LR47KE | 功能描述:线绕电阻器 - 底架安装 330W 0.47 ohms 10% RoHS:否 制造商:Vishay/Dale 电阻:7 Ohms 容差:1 % 功率额定值:100 W 温度系数:50 PPM / C 系列:RH 工作温度范围:- 55 C to + 250 C 尺寸:46.02 mm Dia. x 46.02 mm W x 88.9 mm L x 44.45 mm H 封装:Bulk 产品:Power Resistors Wirewound Aluminum Housed |
| WFH90L100J | 功能描述:线绕电阻器 - 底架安装 90watt 100ohm 5% RoHS:否 制造商:Vishay/Dale 电阻:7 Ohms 容差:1 % 功率额定值:100 W 温度系数:50 PPM / C 系列:RH 工作温度范围:- 55 C to + 250 C 尺寸:46.02 mm Dia. x 46.02 mm W x 88.9 mm L x 44.45 mm H 封装:Bulk 产品:Power Resistors Wirewound Aluminum Housed |
| WFH90L100JE | 功能描述:线绕电阻器 - 底架安装 90watt 100ohm 5% RoHS:否 制造商:Vishay/Dale 电阻:7 Ohms 容差:1 % 功率额定值:100 W 温度系数:50 PPM / C 系列:RH 工作温度范围:- 55 C to + 250 C 尺寸:46.02 mm Dia. x 46.02 mm W x 88.9 mm L x 44.45 mm H 封装:Bulk 产品:Power Resistors Wirewound Aluminum Housed |
| WFH90L10RK | 功能描述:线绕电阻器 - 底架安装 90watt 10ohm 10% RoHS:否 制造商:Vishay/Dale 电阻:7 Ohms 容差:1 % 功率额定值:100 W 温度系数:50 PPM / C 系列:RH 工作温度范围:- 55 C to + 250 C 尺寸:46.02 mm Dia. x 46.02 mm W x 88.9 mm L x 44.45 mm H 封装:Bulk 产品:Power Resistors Wirewound Aluminum Housed |
| WFH90L10RKE | 功能描述:线绕电阻器 - 底架安装 90watt 10ohm 10% RoHS:否 制造商:Vishay/Dale 电阻:7 Ohms 容差:1 % 功率额定值:100 W 温度系数:50 PPM / C 系列:RH 工作温度范围:- 55 C to + 250 C 尺寸:46.02 mm Dia. x 46.02 mm W x 88.9 mm L x 44.45 mm H 封装:Bulk 产品:Power Resistors Wirewound Aluminum Housed |
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