Anti Sulphur
Chip Resistors
ASC 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
07. 12
· 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
Dimensions (mm) and weight (mg)
L W T C A Wt. nom.
0402 1.0 ±0.05 0.5 ±0.05 0.35 ±0.05 0.2 ±0.1 0.2 ±0.1 0.62
0603 1.6 ±0.1 0.8 ±0.1 0.45 ±0.1 0.3 ±0.2 0.3 ±0.2 2.04
0805 2.0 ±0.1 1.25 ±0.1 0.5 ±0.1 0.35 ±0.2 0.4 ±0.2 4.37
1206 3.1 ±0.1 1.55 ±0.1
0.55 ±0.1
0.5 ±0.25
0.5 ±0.2
8.95
1210 3.2 ±0.2 2.6 ±0.15 16.0
2010 5.0 ±0.2 2.5 ±0.15 0.6 ±0.25 24.2
2512 6.35 ±0.2 3.2 ±0.15 39.4
0402 0603 0805 1206 1210 2010 2512
Power rating @ 70ºC watts 0.063 0.1 0.125 0.25 0.33 0.75 1
Resistance range ohms 1R0 - 10M
Current Rating (zero ohm jumper) amps 1 1 2 2 2.5 3.5 4
Limiting element voltage volts 50 150 200 250
TCR ppm/ºC <10R: 200 10R to 1M0: 100 >1M0: 200
Resistance tolerance % 1
Standard values E24, E96
Ambient temperature range ºC -55 to +155
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.
Electrical Data
Physical Data
T
W
A
A
L
Wrap-around terminations
(3 faces)
Ordering Procedure
Example: ASC1210 at 22 ohms and 1% tolerance on a reel of 5000 pieces -
Anti Sulphur Chip Resistors
ASC 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
07. 12
Maximum
Load at rated power: 1000 hours cyclic load @ 70°C ΔR% 2% + 0.1Ω
Short term overload: Lesser of 6.25 x rated power or 2 x LEV for s ΔR% 1% + 0.05Ω
Hydrogen Sulphide: 1000 hours 3-5ppm H2S, 50 ±2°C, 92 ±1% RH, no load ΔR% 0.5% and no visual defects
Derating from rated power at 70°C Linear to zero at 155°C
Dry heat: 1000 hours at 155°C ΔR% 1% + 0.05Ω
Damp heat 1000 hours 40°C 90-95% RH ΔR% 2% + 0.1Ω
Temperature rapid change -55 to 155°C, 5 cycles ΔR% 0.5% + 0.05Ω
Resistance to solder heat: 260±5°C for 10s ΔR% 0.5% + 0.05Ω
Solderability: 245±5°C for 3s ≥95% coverage
Solder leaching: 260±5°C for 30s Leached area ≤10% total, ≤5% individual
Board Flex: once for 5s, 2010 & 2512: 2mm, smaller sizes: 3mm ΔR% 1% +0.05Ω
Insulation resistance @ 2 x LEV for 60s ohms >10G
Performance Data
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.
Type
A S C 1 2 1 0 - 2 2 R F T5
Size
Value (use IEC62 code)
Tolerance (use IEC62 code)
Packing
T10
Tape
0402 10,000/reel (7”)
StandardT5 0603, 0805, 1206, 1210 5000/reel (10”)
T4 2010, 2512 4000/reel (7”)
F 1%
Note: For zero ohm jumper, substitute value and tolerance with the code R000
