Resistors
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
AEC-Q200 qualified
All parts are Pb-free and comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
Electrical Data
0402 0603 0805 1206 1210 2010 2512
Power rating @ 70°C 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/°C <10R: 200 10R to 1M0: 100 >1M0: 200
Resistance tolerance % 1
Standard values E24, E96
Ambient temperature range °C -55 to +155
Physical Data
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 T
0805 2.0 ±0.1 1.25 ±0.1 0.5 ±0.1 0.35 ±0.2 0.4 ±0.2 4.37 A
1206 3.1 ±0.1 1.55 ±0.1 8.95 L A W
0.5 ±0.25
1210 3.2 ±0.2 2.6 ±0.15 16.0
0.55 ±0.1 0.5 ±0.2
2010 5.0 ±0.2 2.5 ±0.15 24.2 Wrap-around terminations
0.6 ±0.25
2512 6.35 ±0.2 3.2 ±0.15 39.4 (3 faces)
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.
BI Technologies IRC Welwyn
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
www.ttelectronics.com/resistors
© TT Electronics plc
06.18
Anti Sulphur Chip Resistors
ASC Series
Performance Data
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
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 1210 - 22R F T5
Type
Size
Value (use IEC62 code)
Tolerance (use IEC62 code)
F 1%
Packing
T10 0402 10,000/reel (7”)
T5 Tape 0603, 0805, 1206, 1210 5000/reel (10”) Standard
T4 2010, 2512 4000/reel (7”)
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.
BI Technologies IRC Welwyn
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
www.ttelectronics.com/resistors
© TT Electronics plc
06.18
