Resistors
Radial Ceramic Case Resistors
Radial Ceramic Case Resistors
Make Possible
Wirewound / Metal Oxide
Wirewound / Metal Oxide
Radial Ceramic Case Resistors
Wirewound / Metal Oxide
SQM Series
SQM Series
2 to 10 watts
SQM / CVF / CVW Series
2 to 10 watts
Resistance 0R1 to 200K
Resistance 0R1 to 200K
2 to 10 watts
High overload capability
High overload capability
Resistance 0R1 to 200K
Flameproof case
Flameproof case
High overload capability
Small PCB footprint
Small PCB footprint
Flameproof case
RoHS compliant
RoHS compliantSmall PCB footprint
RoHS compliant
All parts are Pb-free and comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
Electrical Data
SQM2 / CV-2 SQM3 / CV-3 SQM5 / CV-5 SQM7 / CV-7 SQM10 / CV-10
SQM2 / CV-2 SQM3 / CV-3 SQM5 / CV-5 SQM7 / CV-7 SQM10 / CV-10
Power rating at 70C watts 2 3 5 7 10
watts 2 3 5 7 10
Power rating at 70C
ohms
Resistance range wirewound (CVW) 0R1 - 27R 0R1 - 39R 0R1 - 47R 0R1 - 680R 0R1 - 910R
ohms
Resistance range wirewound (CVW) / CV-2 0R1 - 27R 0R1 - 39R 0R1 - 47R 0R1 - 680R 0R1 - 910R
/ CV-2
Resistance range oxide (CVF) ohms 30R 33K 43R 56K 51R 100K 750R - 200K 1K0 - 200K
Resistance range oxide (CVF) ohms
30R 33K 43R 56K 51R 100K 750R - 200K 1K0 - 200K
Limiting element voltage volts dc or ac rms 150 300 350 500 750
Limiting element voltage volts dc or ac rms 150 300 350 500 750
Thermal impedance C /watt 50 45 30 28 23
Thermal impedance 50 45 30 28 23
C /watt
Isolation voltage volts 1000
Isolation voltage volts 1000
TCR
ppm/C <20R: 400, 20R: 350
TCR ppm/C <20R: 400, 20R: 350
Resistance Tolerance % 5 10
Resistance Tolerance %
5 10
Standard Values E24
Standard Values E24
Ambient temperature range -55 to +155C
C
Ambient temperature range C -55 to +155C
Physical Data (all dimensions in mm, weights in g)
P hysical Data (all dimensions in mm, weights in g)
L W D B E F P d We ight
L W D B E F P d We ight
Type
Type
1.0 1.0 B
1 .0 1.0 1.0 1.0 1 .0 0.05 Nom.
d
B
1 .0 1.0 1.0 1.0 1.0 1.0 Nom. F
1 .0 0.05 d
F
SQM2 / CV-2 20 11.5 7.5 4.5 3.0 3.0 5 0.7 4.3
SQM2 / CV-2 20 11.5 7.5 4.5 3.0 3.0 5 0.7 4.3
W P
P
/ CV-3 4.5 4.0 4.0 W
SQM3 25 12.5 8.5 5 0.7 5.6
SQM3 / CV-3 25 12.5 8.5 4.5 4.0 4.0 5 0.7 5.6
SQM5 / CV-5 25 12.5 9 5.0 3.5 3.5 5 0.8 6.3
E
SQM5 / CV-5 25 12.5 9 5.0 3.5 3.5 5 0.8 6.3
E
D
L 51
D L 51
SQM7 / CV-7 38 12.5 9 5.0 2.75 5.0 5 0.8 10.7
SQM7 / CV-7 38 12.5 9 5.0 2.75 5.0 5 0.8 10.7
Marked side
Marked side
SQM10/ CV-10 50 12.5 9 4.25 2.75 5.0 5 0.8 13.4
SQM10/ CV-10 50 12.5 9 4.25 2.75 5.0 5 0.8 13.4
Construction
Construction
A high purity ceramic rod, with force fit end caps onto which is wound a wire element: or a deposited metal oxide film
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.
(depending on value). The element is fitted into a ceramic case with fireproof insulation cement.
General Note
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of
TT electronics plc
TT electronics plc
All information is subject to TT Electronics own data and is considered accurate at time of going to print.
Welwyn Components Limited Bedlington Northumberland NE22 7AA, UK
www.ttelectronicsresistors.com
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
05 . 08
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com 05 . 08
TT Electronics plc
09.14Radial Ceramic Case Resistors
Radial Ceramic Case Resistors
Wirewound / Metal Oxide
Wirewound / Metal Oxide Make Possible
SQM Series
SQM / CVF / CVW Series
Termination Details:
Material The 100% Sn finish 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 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
Maximum
Load at rated power (1000hrs at 70C) R <100K: 5% 100K: 10%
See Graph
Derating from rated power at 70C
short term overload (lesser of 6.25 x Pr or 2.5 x LEV for 5s) R 5% +0.05
5% +0.05
Damp heat steady state (56 days, 40C, 90% RH) R
Temperature rapid change (5 cycles -55C to +155C) R 2% +0.05
Resistance to solder heat R 1% +0.05
No evidence of flashover, mechanical damage,
Voltage Proof (1kV for 60s)
arcing or insulation breakdown
Solderability Min. 95% coverage
Derating Curve
P/Pr
100%
60%
0%
-55 70 155
275
T (C)
Ordering Procedure
Example: SQM3 at 1.2 kilohms and 5% tolerance bulk packed in a box of 3000 pieces
S Q M 3 1 K 2 J B 3
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
J 5%
Packing
B3 SQM2, 3 3000 / box
B2 Bulk SQM5 2000 / box Standard
B1 SQM7, 10 1000 / box
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
Welwyn Components Limited Bedlington Northumberland NE22 7AA, UK
All information is subject to TT Electronics own data and is considered accurate at time of going to print.
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
05 . 08
www.ttelectronicsresistors.com
TT Electronics plc
09.14