215201026021
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Pad & trace area for rated power* mm20010605
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Double-Sided
Chip Resistors
DSC Series
sTwo parallel resistance elements
in a single chip
sExcellent pulse withstand performance
sLaser trimmed up to 0.5% tolerance
sEnhanced working voltage
sEnhanced power rating
sPb-free terminations
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
07. 08
A subsidiary of
TT electronics plc
Welwyn Components
Dimensions (mm) & Weight (g)
L W T max A B min C Wt.
1206 3.2±0.4 1.6±0.2 0.7 0.4±0.2 1.7 0.4±0.15 0.020
2010 5.1±0.3 2.5±0.2 0.8 0.6±0.3 3.0 0.6±0.25 0.036
2512 6.5±0.3 3.2±0.2 0.8 0.6±0.3 4.4 0.6±0.25 0.055
Physical Data
_
*Recommended minimum pad & adjacent trace area for each termination for rated power dissipation on FR4 PCB
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.
T
W
A
A
B
L
Wrap-around terminations
(3 faces)
C
Double Sided
Chip Resistors
DSC 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 07. 08
Welwyn Components
l a c i py Tmum i x aM
Load at rated power: 1000 hours at 70°C ∆52.01 %R
C° 551 t a o r e ZC°07 ta rewop detar m or f gni tareD
Overload: 6.25 x rated power for 2 seconds ∆1.01%R
Shelf life test: 12 months at room temperature ∆20.01.0%R
Dry heat: 1000 hours at 155°C ∆2.01%R
Long term damp heat ∆52.01%R
Temperature rapid change ∆50.052.0%R
Resistance to solder heat ∆50.052.0%R
Performance Data
Note: A 0.01 Ohm addition to be added to the performance of all resistors <10 Ohms.
Pulse Performance Data
10,000
1,000
100
10
1 10 100 1,000 10,000 100,000 1,000,000 10,000,000
1.2/50µs Lightning Surge
Value (Ohms)
Peak Voltage (V)
1206
2010
2512
1206
2010
2512
10,000
1,000
100
10
10 100 1,000 10,000 100,000 1,000,000 10,000,000
10/700µs Lightning Surge
Value (Ohms)
Peak Voltage (V)
Lightning Surge
Resistors are tested in
accordance with IEC 60 115-1 using
both 1.2/50µs and 10/700µs pulse
shapes. 10 pulses are applied. The
limit of acceptance is a shift in
resistance of less than 1% from the
initial value.
Double Sided
Chip Resistors
DSC 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 07.08
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.
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.
2/10us
10/1000us
10,000
1,000
100
1 10 100 1,000 10,000 100,000 1,000,000 10,000,000
DSC2512 - Bellcore GR1089 Lightning Surge
Value (Ohms)
Peak Voltage (V)
1206
2010
2512
1,000
100
10
1
0.0001 0.001 0.01 0.1 1
Single Pulse
Pulse Duration (s)
Peak Power (W)
1206
2010
2512
1,000
100
10
1
0.0001 0.001 0.01 0.1 1
Continuous Pulses
Pulse Duration (s)
Peak Power (W)
Double Sided
Chip Resistors
DSC 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 07. 08
Welwyn Components
Thermal Performance Data
Ambient Temperature/°C
% of Rated Power
125
100
75
50
25
0
-15 70 155
Temperature Derating Curve
Power Dissipation/W
Temperature Rise/°C
80
60
40
20
0
0 0.5 1 1.5
Temperature Rise Curves
1206
2010
2512
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.
2.5 ± 0.5
13 ± 0.5
33 ± 1.0
Marking
(Both sides)
0.8 ± 0.15
80 ± 2
178 ± 2
Wr
P1
A0
B0
D1
D0
P0
P2
G F
W
E
T2
T1
K0
T
Tape and reel dimensions (mm)
W P1 P0 P2 D0 D1 E F A0 B0 K0 T T1 T2
±0.3 ±0.1 ±0.1 ±0.05 ±0.1 ±0.2 ±0.1 ±0.05 ±0.1 ±0.1 ±0.1 ±0.05 nom ±0.15
1206 8 4 4 2 1.5 1 1.75 3.5 1.95 3.55 1.0 0.2 0.05 1.3
2010 12 4 4 2 1.5 1.5 1.75 5.5 2.79 5.89 0.91 0.28 0.06 1.21
2512 12 8 4 2 1.5 1.5 1.75 5.5 3.61 6.96 1.17 0.28 0.06 1.45
Type DSC 2512 - 10K F T 1 8
Size
Value (use IEC62 code)
Tolerance (use IEC62 code) Packing
D 0.5%
F 1%
J 5%
T3 Tape 1206 or 2010 3000/reel Standard
T18 2512 1800/reel
Ordering Procedure
Double Sided
Chip Resistors
DSC 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 07. 08
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
Specify type reference etc as shown in this example of DSC2512 10K ohms 1%.
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.
