Double-Sided
Chip Resistors
DSC Series
Welwyn Components
•
Two parallel resistance elements
in a single chip
•
Excellent pulse withstand performance
•
Laser trimmed up to 0.5% tolerance
•
Enhanced working voltage
•
Enhanced power rating
•
Pb-free terminations
Electrical Data
1206
Power @70°C
2 second overload power @25°C
Short pulse performance
Resistance range
Tolerance
LEV
TCR
Operating temperature
Dielectric withstand voltage
Thermal Impedance
Pad & trace area for rated power*
Values
Ohms
%
Volts
ppm/°C
°C
Volts
°C/W
mm
2
160
50
200
Watts
Watts
0.33
2.1
2010
0.75
4.7
See graphs
1R0 to 4M7
10R to 1M: 0.5, All values: 1, 5
400
<10R:200 >10R:100
_
-55 to +155
500
80
60
E24 or 96 preferred - other values to special order
*
Recommended minimum pad & adjacent trace area for each termination for rated power dissipation on FR4 PCB
50
100
500
2512
1.5
9.4
Physical Data
Dimensions (mm) & Weight (g)
L
1206
2010
2512
3.2±0.4
5.1±0.3
6.5±0.3
W
1.6±0.2
2.5±0.2
3.2±0.2
T max
0.7
0.8
0.8
A
0.4±0.2
0.6±0.3
0.6±0.3
B min
1.7
3.0
4.4
C
0.4±0.15
0.6±0.25
0.6±0.25
Wt.
0.020
A
C
T
B
L
0.036
0.055
A
W
Wrap-around terminations
(3 faces)
Construction
Thick film resistor material, overglaze and organic protection are screen printed on a 96% alumina substrate. Wrap-around terminations
have an electroplated nickel barrier and Pb-free solderable coating, this ensures excellent ‘leach’ resistance properties and solderability.
Marking
Components are not marked. Reels are marked with type, value, tolerance, date code and quantity.
Solvent Resistance
The body protection is resistant to all normal industrial cleaning solvents suitable for printed circuits.
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
Issue B · 01.06
© 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
Double Sided
Chip Resistors
DSC Series
Welwyn Components
Performance Data
Maximum
Load at rated power:
Overload:
Dry heat:
1000 hours at 70°C
Typical
0.25
Zero at 155°C
0.1
0.02
0.2
0.25
0.05
0.05
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
1
1
0.1
1
1
0.25
0.25
Derating from rated power at 70°C
6.25 x rated power for 2 seconds
12 months at room temperature
Shelf life test:
1000 hours at 155°C
Long term damp heat
Temperature rapid change
Resistance to solder heat
Note: A 0.01 Ohm addition to be added to the performance of all resistors <10 Ohms.
Pulse Performance Data
Lightning Surge
Resistors have been tested in
accordance with IEC 60 115-1 using
both 1.2/50µs and 10/700µs pulse
shapes. Also, the 2512 size has
been tested to the Bellcore GR1089
Peak Voltage (V)
1.2/50µs Lightning Surge
10,000
2/10µs and 10/1000µs pulse shapes.
The limit of acceptance is a shift
in resistance of less than 1% from
the initial value.
1,000
1206
2010
2512
100
10
1
10
100
1,000
10,000
100,000
1,000,000 10,000,000
Value (Ohms)
10/700µs Lightning Surge
10,000
Peak Voltage (V)
1,000
1206
2010
2512
100
10
10
100
1,000
10,000
100,000
1,000,000
10,000,000
Value (Ohms)
© 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 B · 01.06
Double Sided
Chip Resistors
DSC Series
Welwyn Components
DSC2512 - Bellcore GR1089 Lightning Surge
10,000
Peak Voltage (V)
2/10us
1,000
10/1000us
100
1
10
100
1,000
10,000
100,000
1,000,000
10,000,000
Value (Ohms)
Single Pulse
The single impulse graph is the
result of 50 impulses of rectangular
shape applied at one-minute
intervals. The limit of acceptance
was a shift in resistance of less
than 1% from the initial value.
Single Pulse
1,000
Peak Power (W)
100
1206
2010
2512
10
1
0.0001
0.001
0.01
0.1
1
Pulse Duration (s)
Continuous Load Due
to Repetitive Pulses
The continuous load graph was
obtained by applying repetitive
rectangular pulses where the pulse
period was adjusted so that the
average power dissipated in the
resistor was equal to its rated power
at 70°C. Again the limit of acceptance
was a shift in resistance of less than
1% from the initial value.
1,000
Continuous Pulses
Peak Power (W)
100
1206
2010
2512
10
1
0.0001
0.001
0.01
0.1
1
Pulse Duration (s)
© 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 B · 01.06
Double Sided
Chip Resistors
DSC Series
Welwyn Components
Thermal Performance Data
Temperature Derating Curve
125
% of Rated Power
100
75
50
25
0
-15
70
155
Ambient Temperature/°C
Temperature Rise Curves
Temperature Rise/°C
80
60
40
20
0
0
0.5
1
1.5
1206
2010
2512
Power Dissipation/W
Packaging
1206 DSC series resistors are supplied on 8mm carrier tape and 7 inch reels as per IEC 286-3, quantity per reel; 3000.
2010 and 2512 DSC series resistors are supplied on 12mm carrier tape and 7 inch reels as per IEC 286-3, quantity per reel;
2010 : 3000pcs; 2512 : 1800pcs. Reels of 1000pcs are available on request.
T
2
D
0
P
2
P
0
Marking
(Both sides)
33
±
1.0
T
Wr
E
178
±
2
80
±
2
B
0
T
1
A
0
K
0
P
1
D
1
2.5
±
0.5
0.8
±
0.15
Tape and reel dimensions (mm)
W
±0.3
1206
2010
2512
8
12
12
P1
±0.1
4
4
8
P0
±0.1
4
4
4
P2
±0.05
2
2
2
D0
±0.1
1.5
1.5
1.5
D1
±0.2
1
1.5
1.5
E
±0.1
1.75
1.75
1.75
F
±0.05
3.5
5.5
5.5
A0
±0.1
1.95
2.79
3.61
B0
±0.1
3.55
5.89
6.96
K0
±0.1
1.0
0.91
1.17
T
±0.05
0.2
0.28
0.28
T1
nom
0.05
0.06
0.06
T2
±0.15
1.3
1.21
1.45
© 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
G
Issue B · 01.06
W
13
±
0.5
F
Double Sided
Chip Resistors
DSC Series
Welwyn Components
Application Notes
DSC resistors are ideally suited for handling by automatic
methods due to their rectangular shape and the small
dimensional tolerances. Electrical connection to a ceramic
substrate or to a printed circuit board can be made by reflow
or wave soldering of wrap-around terminations.
Wrap-around terminations provide good leach properties and
ensure reliable contact. Due to the robust construction, the
DSC can be immersed in the solder bath for 30 seconds at
260°C. This enables the resistor to be mounted on one side
of a printed circuit board and wire-leaded components
applied on the other side. DSC is compatible with typical
Pb-free soldering materials and temperature profiles
DSC resistors themselves can operate at a maximum
temperature of 155°C. For soldered resistors, the joint
temperature should not exceed 110°C. This condition is met
when the stated power levels at 70°C and recommended
pad and trace areas are used. Allowance should be made
if smaller areas of copper are used.
Ordering Procedure
Specify type reference etc as shown in this example of DSC2512 10K ohms 1%.
Type
Size
Value (use IEC62 code)
Tolerance (use IEC62 code)
D
F
J
0.5%
1%
5%
T3
T18
Tape
1206 or 2010
2512
3000/reel
1800/reel
DSC
2512
-
10K
F
T18
Packing
Standard
© 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 B · 01.06
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