Semi-Precision Power
Wirewound Resistors
PPW Series
Welwyn Components
•
Ideal for pulse and surge
applications
•
2 watts to 15 watts
•
Resistance to 0R1 ohms to 5K ohms
•
±3%, ±2% or ±1% tolerance
•
±20 ppm/°C TCR
Electrical Data
PPW-2
Power rating at 25°C
Resistance range
watts
2
PPW-3
3
PPW-5
5
PPW-7
7
PPW-10
10
PPW-15
15
0R1 to 5K
ohms 0R1 to 1K6 0R1 to 1K6 0R1 to 1K6 0R1 to 2K5 0R1 to 5K
Please note: When ordering the alternate configuration please add an ‘A’ after the part number (ie. PPW-3A)
Lighting Surge Capabilities for PPW-2
Resistive range
1R to 9R9
10R to 29R9
30R to 99R
100R to 1K6
ohms
10 x 1000*
250V
500V
600V
1000V
10 x 360*
650V
850V
1000V
1500V
1000V
500V
1000 2000 3000
1000 Volts 10x360µsec
*10 microseconds – Maximum rise time to peak voltage.
360 or 1000 microseconds - minimum decay time to one half peak.
600V
300V
1000 2000 3000
600 Volts 10x1000µsec
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 data and is considered accurate at time of going to print.
A subsidiary of
TT electronics plc
Issue B · 03.02
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
115
Semi-Precision Power
Wirewound Resistors
PPW Series
Welwyn Components
Physical Data
Dimensions (mm)
Standard Configuration
d
25.4
min
Type
PPW-2
PPW-3
PPW-5
PPW-7
PPW-10
PPW-15
Alternate Configuration
W
H
L
3.17 max.
E
L ± 0.8
1705
22.3
22.3
35.3
47.7
47.7
W ± 0.8
6.99
7.87
9.65
9.65
9.65
12.7
H ± 0.8
6.99
7.87
8.89
8.89
8.89
12.7
d dia.
0.8
0.8
0.8
0.8
0.8
0.8
E ± 0.8
8.134
9.65
10.4
11.9
11.9
12.7
Temperature Rise
Hot Spot Temperature (°C)
250
200
150
100
50
0
0
20
40
60
80
100 120
PPW-15
PPW-10
PPW-7
PPW-5
PPW-3
PPW-2
Power Derating
100
80
% Rated Load
60
150
40
20
0
0
Max. Recommended
Ambient Operating
Temperature 150°C
25 40
65
PPW-2
PPW-3, 5, 7, 10
PPW-15
% Rated Load
50
100
150
200
Ambient Temperature (°C)
250
Ordering Procedure
Example: PPW5 at 110 ohms and 1% tolerance in bulk pack
–
PPW5
–
110RF
I
Type
Configuration
A
Standard
Alternate
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
G
Note: 1 & 3% preferred
1%
2%
H
3%
Packing
I
Bulk
Standard
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
116
Issue B · 03.02
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