Semi-Precision Power
Wirewound Resistors
PPW Series
•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
Resistive range ohms 10 x 1000* 10 x 360*
1R to 9R9 250V 650V
10R to 29R9 500V 850V
30R to 99R 600V 1000V
100R to 1K6 1000V 1500V
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.
© 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
PPW-2 PPW-3 PPW-5 PPW-7 PPW-10 PPW-15
Power rating at 25°C watts 2 3 5 7 10 15
Resistance range ohms
0R1 to 1K6 0R1 to 1K6 0R1 to 1K6 0R1 to 2K5 0R1 to 5K 0R1 to 5K
Electrical Data
Lighting Surge Capabilities for PPW-2
Issue B · 03.02
A subsidiary of
TT electronics plc
Welwyn Components
Please note: When ordering the alternate configuration please add an ‘A’ after the part number (ie. PPW-3A)
1000V
500V
1000 Volts 10x360µsec
1000 2000 3000
600V
300V
600 Volts 10x1000µsec
1000 2000 3000
*10 microseconds – Maximum rise time to peak voltage.
360 or 1000 microseconds - minimum decay time to one half peak.
Dimensions (mm)
Semi-Precision Power
Wirewound Resistors
PPW Series
© 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
Welwyn Components
Physical Data
250
200
150
100
50
0
0 20 40 60 80 100 120
Hot Spot Temperature (°C)
% Rated Load
PPW-15
PPW-10
PPW-7
PPW-5
PPW-3
PPW-2
100
80
60
150
40
20
0
0 50 100 150 200 250
% Rated Load
Ambient Temperature (°C)
PPW-2
PPW-15
PPW-3, 5, 7, 10
25 40 65
Max. Recommended
Ambient Operating
Temperature 150°C
Power DeratingTemperature Rise
L3.17 max.
dW
H
25.4
min
E
E
noitarugifnoC etanretlAnoitarugifnoC dradnatS
8.0± E.aid d8.0± H8.0± W8.0± LepyT
PPW-2 1705 6.99 6.99 0.8 8.134
PPW-3 22.3 7.87 7.87 0.8 9.65
PPW-5 22.3 9.65 8.89 0.8 10.4
PPW-7 35.3 9.65 8.89 0.8 11.9
PPW-10 47.7 9.65 8.89 0.8 11.9
PPW-15 47.7 12.7 12.7 0.8 12.7
Ordering Procedure
Example: PPW5 at 110 ohms and 1% tolerance in bulk pack –
P P W 5 – 1 1 0 R F I
Type
Configuration
Standard
A
Alternate
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
1%
H
3%
G
2%
Note: 1 & 3% preferred
Packing
I
Standard