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
A subsidiary of
TT electronics plc
05 . 08
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
Radial Ceramic Case Resistors
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
watts
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
°C
-55 to +155ºC
Physical Data
(all dimensions in mm, weights in g)
Type L
± 1.0
W
± 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
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)
A subsidiary of
TT electronics plc
05 . 08
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
Radial Ceramic Case Resistors
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
watts
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
°C
-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)
Make Possible
Resistors
09.14
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.ttelectronicsresistors.com
AllpartsarePb-freeandcomplywithEUDirecve2011/65/EU(RoHS2)
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)
Make Possible
09.14
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.ttelectronicsresistors.com
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 Value Tolerance 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 Value Tolerance
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
Make Possible
09.14
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.ttelectronicsresistors.com