Double-Sided
Chip Resistors
DSC Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
General Note
TT electronics reserves the right to make changes in product specification 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
08. 11
· 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
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150
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Double-Sided
Chip Resistors
DSC Series
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
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
04. 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
0805 2.0±0.3 1.25±0.2 0.7 0.3±0.15 0.9 0.3±0.15 0.012
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
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
General Note
TT electronics reserves the right to make changes in product specification 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
08. 11
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
Performance Data
Pulse Performance Data
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.
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Load at rated power: 1000 hours at 70°C ∆52.01 %R
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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
Note: A 0.01 Ohm addition to be added to the performance of all resistors <10 Ohms.
10
100
1,000
10,000
1 10 100 1,00010,000100,000 1,000,000 10,000,000
Peak Voltage (V)
Value (ohms)
1.2/50µs Lightning Surge
0805
1206
2010
2512
10
100
1,000
10,000
10 100 1,00010,000100,000 1,000,000 10,000,000
Peak Voltage (V)
Value (ohms)
10/700µs Lightning Surge
0805
1206
2010
2512
Double Sided
Chip Resistors
DSC Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
General Note
TT electronics reserves the right to make changes in product specification 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
08. 11
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.
100
1,000
10,000
1 10 100 1,00010,000100,000 1,000,000 10,000,000
Peak Voltage (V)
Value (ohms)
DSC2512 - Bellcore GR1089 Lightning Surge
2/10µs
10/1000µs
1
10
100
1000
0.0001 0.001 0.01 0.1 1
Peak Power (W)
Pulse Duration (s)
Single Pulse
0805
1206
2010
2512
0.1
1
10
100
1000
0.0001 0.001 0.01 0.1 1
Peak Power (W)
Pulse Duration (s)
Continuous Pulses
0805
1206
2010
2512
Double Sided
Chip Resistors
DSC Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
General Note
TT electronics reserves the right to make changes in product specification 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
08. 11
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
Packaging
0805 and1206 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.
0
10
20
30
40
50
60
70
80
0 0.5 1 1.5
Temperature Rise ( °C)
Power Dissipation (W)
Temperature Rise Curves
0805
1206
2010
2512
Double Sided
Chip Resistors
DSC Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
General Note
TT electronics reserves the right to make changes in product specification 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
08. 11
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 0805, 1206 or 201 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.
