Ceramic Case Resisters –
Wirewound / Metal Oxide
SQP Series
•2 watts to 20 watts*
•Resistance 0R1 to 100K
•High overload capability
•RoHS compliant
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
Electrical Data
Issue C · 07.06
A subsidiary of
TT electronics plc
Welwyn Components
* Other styles (radial/pluggable); sizes, and 30, 40, 50 W types are available to special order.
SQP2 SQP3 SQP5 SQP7/7S SQP10 SQP15 SQP20
0251017532sttawC˚07 ta gnitar rewoP
Resistance range Wirewound 0R1-50R 0R1- 0R1- 0R1-100R 0R1- 0R1- 0R1-
100R 100R (7 & 7S) 200R 200R 500R
Metal Oxide 51R- 100R- 110R- 110R-47K 220R- 220R- 510R-
(Ohms) 47K 47K 47K (7 Only) 68K 68K 100K
Limiting element voltage volts dc or ac rms 150 300 350 500 (7S-350) 750 1000 1000
31613282035405ttaw/C˚ecnadepmi lamrehT
0001stlovegatlov noitalosI
;mpp0071 ,86R0< ,sepyt WWC˚/mppRCT 0R68, 200ppm: MO types all values 350ppm
)J(5%ecnareloT ecnatsiseR
Standard Values E24 preferred
C˚551+ ot 55-C˚egnar erutarepmet tneibmA
70
Physical Data
d nom ± 0.05
f L f
Min bend radius, all types 1.6 mm
W
H
Packaging
Our standard packaging for SQP Series is bulk pack
Dimensions (mm) and weight (g)
Resistors
09.09
Type L max. W max. H max. f min. d (±0.1) Wt. nom.
SQP2 19 8 8 23 0.70 2.2
SQP3 23 9 9 27 0.70 3.5
SQP5 23 11 10 27 0.75 5.0
SQP7 36 11 10 30 0.75 8.2
SQP7S 26 10 10 30 0.75 6.0
SQP10 50 11 11 30 0.75 11.0
SQP15 50 13.5 13.5 30 0.75 17.4
SQP20 61 15.5 14.5 30 0.75 25.0
Ceramic Case Resisters –
Wirewound / Metal Oxide
SQP 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 Issue C · 07.06
Welwyn Components
Maximum
Load at rated power (1000hrs at 70˚C) 50.0+ %5%R
hparG eeSC˚07 ta rewop detar morf gnitareD
Short term overload * 50.0+ %2%R
Damp heat steady state (56 days, 40˚C, 90% RH) 50.0+ %2%R
Temperature rapid change 50.0+ %2%R
Resistance to solder heat 50.0+ %1%R
Pulse handling Data available by request
71
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.
Termination Details
Material The tinned copper lead wires are internally welded to the resistance element end caps.
Solderability The terminations meet the requirements of IEC 115-1 Clause 4.17.3.2
Strength The terminations meet the requirements of IEC 86.2.21
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.
Performance Data
*(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
Metal Oxide types
100%
50%
0%-30 70 155 240
T˚C
118%
P
Wirewound types
100%
50%
0%-30 25 70 155 240
T˚C
Ordering Procedure
Example: 5,000 SQP3 at 1.2 kilohms and 5% tolerance in standard bulk pack option-
Model SQP3 – 1K2 J B10
Value (use IEC62 code)
Tolerance (use IEC62 code)
J 5%
Packing
CODE Family Qty/
Carton
B5 SQP2,3,5 5000
Bulk
B15 Pack SQP7,10 1500
B1 SQP15,20 1000
09.09
Resistors
B5
