Ceramic Case
Resistors
–
Resisters
Wirewound / Metal Oxide
SQP Series
•
•
•
•
2 watts to 20 watts*
Resistance 0R1 to 100K
High overload capability
RoHS compliant
Welwyn Components
Electrical Data
SQP2
Power rating at 70˚ C
Resistance range
Wirewound
Metal Oxide
(Ohms)
Limiting element voltage
Thermal impedance
Isolation voltage
TCR
Resistance Tolerance
Standard Values
Ambient temperature range
˚C
volts dc or ac rms
˚ C/watt
volts
ppm/˚ C
%
watts
2
0R1-50R
51R-
47K
150
50
SQP3
3
0R1-
100R
100R-
47K
300
45
SQP5
5
0R1-
100R
110R-
47K
350
30
SQP7/7S
7
0R1-100R
(7 & 7S)
110R-47K
(7 Only)
500
(7S-350)
28
1000
WW types, <0R68, 1700ppm; 0R68, 200ppm: MO types all values 350ppm
5(J)
E24 preferred
-55 to +155˚ C
SQP10
10
0R1-
200R
220R-
68K
750
23
SQP15
15
0R1-
200R
220R-
68K
1000
16
SQP20
20
0R1-
500R
510R-
100K
1000
13
* Other styles (radial/pluggable); sizes, and 30, 40, 50 W types are available to special order.
Physical Data
Type
SQP2
SQP3
SQP4
SQP5
SQP7
SQP7S
SQP10
SQP15
SQP20
L
Max
18.5
22.5
22.5
22.5
36.0
26.0
50.0
50.0
61.0
W
Max
7.5
8.5
10
10
10
10
10
13.5
14.5
H
Max
7.5
8.5
10
10
10
10
10
13.5
14.5
d
Nom
0.75
0.75
0.75
0.75
0.75
0.75
0.75
0.75
0.75
Weight
gm
2.2
3.5
5.0
5.0
8.2
6.0
11.0
17.4
25.0
35 ± 1.0
L
35 ± 1.0
W
H
d nom ± 0.05
Min bend radius, all types 1.6 mm
Packaging
Our standard packaging for SQP Series is bulk pack - resistors are supplied loose packed in plastic bags or boxes.Quantities/ bag,
box, carton: SQP2, 3: 50/bag, 500/box, 5000/carton :: SQP5: 140/box, 1400 carton SQP7,10:150/box,1500/carton ::
SQP15,20:100/box, 1000/carton
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
© 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
Issue D ·
·
01.07
Issue C 07.06
70
Ceramic Case Resisters –
Resistors
Wirewound / Metal Oxide
SQP Series
Construction
A high purity ceramic rod, with force fit end caps onto which is wound a wire element: or a deposited metal oxide film
(depending on value). The element is fitted into a ceramic case with fireproof insulation cement.
Welwyn Components
Termination Details
Material
Solderability
Strength
The tinned copper lead wires are internally welded to the resistance element end caps.
The terminations meet the requirements of IEC 115-1 Clause 4.17.3.2
The terminations meet the requirements of IEC 86.2.21
Performance Data
Maximum
Load at rated power (1000hrs at 70˚C)
Derating from rated power at 70˚ C
Short term overload *
Damp heat steady state (56 days, 40˚C,
Temperature rapid change
Resistance to solder heat
Pulse handling
90% RH)
R%
R%
R%
R%
R%
5% +0.05
See Graph
2% +0.05
2% +0.05
2% +0.05
1% +0.05
Data available by request
*(Wirewound:: the lower of 5x rated power, or 2.5x LEV for 5 secs. Metal Oxide:: the lower of 6.25x rated power, or 2.5x LEV for 5 secs)
P
118%
100%
Wirewound types
P
100%
Metal Oxide types
50%
50%
0%
-30
T˚C
25
70
155
240
0%
-30
T˚C
70
155
240
Marking
Type reference, resistance value and tolerance are legend marked onto the upper surface.
Flammability
The resistor will not burn or emit incandescent particles under any condition of applied temperature or
overload.
Solvent resistance
The body protection and marking are resistant to all normal industrial solvents suitable for printed
circuits.
Ordering Procedure
Example: 5,000 SQP3 at 1.2 kilohms and 5% tolerance in standard bulk pack option-
Model
SQP3 –
1K2
J
B5
B10
CODE
B5
B15
B1
Bulk
Pack
Family
SQP2,3,5
SQP7,10
SQP15,20
Qty/
Carton
5000
1500
1000
Value (use IEC62 code)
Tolerance (use IEC62 code)
J 5%
Packing
© 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
Issue D ·
07.06
Issue C
01.07
71
Wireless Connectivity
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