WH300-470RJI Welwyn Components, WH300-470RJI Datasheet - Page 4

• Manufacturer Part Number: WH300-470RJI
• Description: RESISTOR, 300W, 5%, 470R
• Manufacturer: Welwyn Components
• Series: WHr

Specifications of WH300-470RJI

• Resistance: 470ohm
• Resistance Tolerance: ± 5%
• Power Rating: 300W
• Voltage Rating: 2.5kV
• Temperature Coefficient: ± 100ppm/°C
• Resistor Element Material: Wirewound
• Resistor Case Style: Axial Leaded
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Derating for ambient temperature
Reference heatsink dimensions
Aluminium Housed
Wirewound Resistors
The standard aluminium heatsinks are defined in the table below. If smaller heatsinks are used then derating should
be applied as indicated in the graph below.
WH200 and WH300 are supplied with a set of four M6 nuts and washers. The screw terminations can support a
maximum tightening torque of 5Nm.
Packaging
WH5-100 resistors are packed in plastic bags and boxed. WH200 & 300 are individually boxed.
Ordering Procedure
Example: WH25 at 100 ohms with a 5% tolerance:
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
Packing
The following options apply to WH5 – 50 only:
For CECC released product state on order the CECC number and style. Example: WH25-3K3JI CECC40203-006 CA
For SnPb finish instead of Pb-free replace the packing suffix with PB. Example: WH25-3K3JPB
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own test data and is considered accurate at time of print.
Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: [phone] Fax: [phone] Web: www.welwyn-tt.com
WH50 @ 50W
F
G
I
Welwyn Components Limited
Type (CECC) Thickness (mm)
WH25 (CA)
WH50 (DA)
WH5 (AA)
WH10 (BA)
Bulk
WH100
WH200
WH300
1%
2%
1 20
1 00
80
60
40
20
All Sizes
J
K
0
0
A m b ie n t T e m p e ra tu r e (° C )
5%
10%
1.5
1
1
1
1
3
3
3
Standard
10 0
Area (cm²)
1000
3800
5800
410
410
544
544
930
20 0
Derating for reduced heatsink dimensions
1000
100
W H 2 5 – 1 0 0 R J I
10
1
1
10
Heatsink Surface Area (cm
100
WH10/BA 25°C
WH10/BA 70°C
WH5/AA 25°C
WH5/AA 70°C
2
)
DA 25°C
DA 70°C
WH25/CA 25°C
WH25/CA 70°C
1000
WH50 25°C
WH100 70°C
WH100 25°C
WH200 70°C
WH200 25°C
WH300 25°C
WH300 70°C
10000