Anti Sulphur
Chip Resistors
ASC Series
·
·
·
·
·
Special construction resists sulphide growth
Withstands sulphur bearing fume environment
Tested to ASTM-B809 (“Flowers-of-Sulphur”)
Suitable for industrial, automotive and roadside uses
RoHS compliant matt tin finish terminations
Electrical Data
0402
Power rating @ 70ºC
Resistance range
Current Rating (zero ohm jumper)
Limiting element voltage
TCR
Resistance tolerance
Standard values
Ambient temperature range
ºC
watts
ohms
amps
volts
ppm/ºC
%
1
50
1
2
150
1
E24, E96
-55 to +155
0.063
0603
0.1
0805
0.125
1206
0.25
1R0 - 10M
2
2.5
200
3.5
4
250
1210
0.33
2010
0.75
2512
1
<10R: 200 10R to 1M0: 100 >1M0: 200
Physical Data
Dimensions (mm) and weight (mg)
L
0402
0603
0805
1206
1210
2010
2512
1.0 ±0.05
1.6 ±0.1
2.0 ±0.1
3.1 ±0.1
3.2 ±0.2
5.0 ±0.2
6.35 ±0.2
W
0.5 ±0.05
0.8 ±0.1
1.25 ±0.1
1.55 ±0.1
2.6 ±0.15
2.5 ±0.15
3.2 ±0.15
0.55 ±0.1
0.6 ±0.25
T
0.35 ±0.05
0.45 ±0.1
0.5 ±0.1
C
0.2 ±0.1
0.3 ±0.2
0.35 ±0.2
0.5 ±0.25
0.5 ±0.2
A
0.2 ±0.1
0.3 ±0.2
0.4 ±0.2
Wt. nom.
0.62
2.04
4.37
8.95
16.0
24.2
39.4
Wrap-around terminations
(3 faces)
A
L
A
W
T
Construction
Conductors, resistive element, glass inner protection and epoxy outer protection are applied to a 96% alumina substrate. The
chips are supplied with wrap-around terminations suitable for soldering. The terminations have an electroplated nickel barrier and
100% matt tin finish.
Marking
Sizes larger than 0603 are individually marked with 4 digits. The first three digits are the significant figures and the fourth defines
the number of added zeros.
Size 0603, E24 values are marked with 3 digits. The first two digits are the significant figures and the third defines the number of
added zeros.
Size 0603, E96 values are marked with a standard 3 digit EIA96 code.
Size 0402 has no marking.
The body protection and marking are resistant to all normal cleaning solvents suitable for printed circuits.
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.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
07. 12
Anti Sulphur Chip Resistors
ASC Series
Performance Data
Maximum
Load at rated power: 1000 hours cyclic load @ 70°C
Short term overload: Lesser of 6.25 x rated power or 2 x LEV for s
Hydrogen Sulphide: 1000 hours 3-5ppm H2S, 50 ±2°C, 92 ±1% RH, no load
Derating from rated power at 70°C
Dry heat: 1000 hours at 155°C
Damp heat 1000 hours 40°C 90-95% RH
Temperature rapid change -55 to 155°C, 5 cycles
Resistance to solder heat: 260±5°C for 10s
Solderability: 245±5°C for 3s
Solder leaching: 260±5°C for 30s
Board Flex: once for 5s, 2010 & 2512: 2mm, smaller sizes: 3mm
Insulation resistance @ 2 x LEV for 60s
ΔR%
ohms
ΔR%
ΔR%
ΔR%
ΔR%
ΔR%
ΔR%
2% + 0.1Ω
1% + 0.05Ω
0.5% and no visual defects
Linear to zero at 155°C
1% + 0.05Ω
2% + 0.1Ω
0.5% + 0.05Ω
≥95%
coverage
Leached area
≤10%
total,
≤5%
individual
1% +0.05Ω
>10G
ΔR%
0.5% + 0.05Ω
Packaging
ASC resistors are supplied taped and reeled on a 7 or 10” reel as per IEC 286-3. The tape is 12mm wide embossed plastic tape
for 2010 and 2512 sizes and 8mm wide paper tape for the smaller sizes.
Ordering Procedure
Example: ASC1210 at 22 ohms and 1% tolerance on a reel of 5000 pieces -
ASC
Type
Size
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
Packing
T10
T5
T4
Tape
0402
0603, 0805, 1206, 1210
2010, 2512
1%
1210 - 22R
F
T5
10,000/reel (7”)
5000/reel (10”)
4000/reel (7”)
Standard
Note: For zero ohm jumper, substitute value and tolerance with the code R000
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.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
07. 12
