Radial Ceramic Case Resistors
Wirewound / Metal Oxide
SQM / CVF / CVW Series
2to10was
Resistance0R1to200K
Highoverloadcapability
Flameproofcase
SmallPCBfootprint
RoHScompliant
General Note
Wirewound / Metal Oxide
2 to 10 watts
Resistance 0R1 to 200K
High overload capability
Flameproof case
Small PCB footprint
RoHS compliant
SQM Series
Electrical Data
SQM2 / CV-2
/ CV-2
SQM3 / CV-3
SQM5 / CV-5
SQM7 / CV-7
SQM10 / CV-10
Power rating at 70°C
2
3
5
7
10
0R1 - 27R 0R1 - 39R 0R1 - 47R 0R1 - 680R 0R1 - 910R
30R – 33K 43R – 56K 51R – 100K 750R - 200K
1K0 - 200K
Limiting element voltage volts dc or ac rms 150 300 350 500 750
Thermal impedance °C /watt 50 45 30 28
23
Isolation voltage volts 1000
TCR ppm/°C <20R: ± 400, ≥20R: ± 350
Resistance Tolerance % ± 5 ± 10
Standard Values
E24
Ambient temperature range
-55 to +155ºC
Physical Data
(all dimensions in mm, weights in g)
Type L
± 1.0
W
± 1.0
D
± 1.0
P
± 1.0
d
± 0.05
Weight
Nom.
SQM2 / CV-2 20 11.5 7.5 5 0.7 4.3
SQM3
25 12.5
8.5
5
0.7
5.6
SQM5 25 12.5 9 5 0.8 6.3
SQM7 38 12.5 9 5 0.8 10.7
SQM10
50 12.5
9
5
0.8
13.4
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.
B E F
± 1.0
4.5 3.0 3.0
4.5 4.0 4.0
5.0 3.5 3.5
5.0 2.75 5.0
4.25 2.75 5.0
± 1.0 ± 1.0
5±1
D
L
P
d
B
E
F
W
Marked side
/ CV-3
/ CV-5
/ CV-7
/ CV-10
Resistance range – wirewound (CVW) ohms
ohms
Resistance range – oxide (CVF)
SQM10A / CV-10
10
0R1 - 560R
750
23 23
SQM10A 35 16 .0 12 7.5 0.8 13.8
6.0 4.25 4.25
/ CV-10
General Note
Wirewound / Metal Oxide
2 to 10 watts
Resistance 0R1 to 200K
High overload capability
Flameproof case
Small PCB footprint
RoHS compliant
SQM Series
Electrical Data
SQM2 / CV-2
/ CV-2
SQM3 / CV-3
SQM5 / CV-5
SQM7 / CV-7
SQM10 / CV-10
Power rating at 70°C
2
3
5
7
10
0R1 - 27R 0R1 - 39R 0R1 - 47R 0R1 - 680R 0R1 - 910R
30R – 33K 43R – 56K 51R – 100K 750R - 200K
1K0 - 200K
Limiting element voltage volts dc or ac rms 150 300 350 500 750
Thermal impedance °C /watt 50 45 30 28
23
Isolation voltage volts 1000
TCR ppm/°C <20R: ± 400, ≥20R: ± 350
Resistance Tolerance % ± 5 ± 10
Standard Values
E24
Ambient temperature range
-55 to +155ºC
Physical Data
(all dimensions in mm, weights in g)
Type L
± 1.0
W
± 1.0
D
± 1.0
P
± 1.0
d
± 0.05
Weight
Nom.
SQM2 / CV-2 20 11.5 7.5 5 0.7 4.3
SQM3
25 12.5
8.5
5
0.7
5.6
SQM5 25 12.5 9 5 0.8 6.3
SQM7 38 12.5 9 5 0.8 10.7
SQM10
50 12.5
9
5
0.8
13.4
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.
B E F
± 1.0
4.5 3.0 3.0
4.5 4.0 4.0
5.0 3.5 3.5
5.0 2.75 5.0
4.25 2.75 5.0
± 1.0 ± 1.0
5±1
D
L
P
d
B
E
F
W
Marked side
/ CV-3
/ CV-5
/ CV-7
/ CV-10
Resistance range – wirewound (CVW) ohms
ohms
Resistance range – oxide (CVF)
SQM10A / CV-10
10
0R1 - 560R
750
23 23
SQM10A 35 16 .0 12 7.5 0.8 13.8
6.0 4.25 4.25
/ CV-10
Resistors
06.18
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
Electrical Data
Physical Data (all dimensions in mm, weights in g)
Construcon
A high purity ceramic rod, with force t end caps onto which is wound a wire element: or a desposited metal oxide lm
(depending on value). The element is tted into a ceramic case with reproof insulation cement.
AllpartsarePb-freeandcomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)AllpartsarePb-freeandcomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)
Radial Ceramic Case Resistors
Wirewound / Metal Oxide
SQM / CVF / CVW Series
Radial Ceramic Case Resistors
Wirewound / Metal Oxide
05 . 08
© 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
SQM 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 70°C) ΔR
Derating from rated power at 70°C See Graph
ΔR 5% +0.05Ώ
Damp heat steady state (56 days, 40°C, ≥90% RH) ΔR 5% +0.05Ώ
Temperature rapid change (5 cycles -55ºC to +155ºC) ΔR 2% +0.05Ώ
Resistance to solder heat ΔR 1% +0.05Ώ
Voltage Proof (1kV for 60s)
No evidence of flashover, mechanical damage,
arcing or insulation breakdown
Solderability Min. 95% coverage
Derating Curve
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
Bulk
SQM2, 3
3000 / box
Standard
B2
SQM5
2000 / box
B1
SQM7, 10
1000 / box
0%
100%
T (°C)
70
155
275
60%
-55
P/Pr
<100K: 5% ≥100K: 10%
short term overload (lesser of 6.25 x Pr or 2.5 x LEV for 5s)
06.18
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
Radial Ceramic Case Resistors
Wirewound / Metal Oxide
SQM / CVF / CVW Series
Ordering Procedure
This product has two valid part numbers:
European (Welwyn) Part Number: SQM3-1K2JB3 (SQM3, 1.2 kilohms ±5%, Pb-free)
S
Q
M
3
-
1
K
2
J
B
3
1
2
3
4
USA (IRC) Part Number: CVF31201JLF (CVF3, 1.2 kilohms ±5%, Pb-free)
C
V
F
3
1
2
0
1
J
L
F
1
2
3
4
5
1
2
3
4
Type ValueTolerance Packing & Termination Finish
SQM2, SQM3,
SQM5, SQM7
SQM10,
E24 = 3/4 characters
R = ohms
K = kilohms
J = ±5%
Pb-free only
K = ±10%
B3
SQM2, SQM3
3000/box
B2
SQM5
2000/box
B1
SQM7, SQM10
1000/box
1
2
3
4
5
Type Size ValueTolerance
Termination
Finish
Packing
CVF,
CVW
2
3 digits + multiplier
R = ohms for values
<100 ohms
J = ±5%
LF = Pb-free
2, 3
3000/box
3
K = ±10%
5
2000/box
5
7, 10
1000/box
7
10
SQM10A
B09 SQM10A 900/box
06.18
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn