Precision Surface Mount Resistors
PCF Series
Performance Data - Standard Range
Test Parameters
Conditions
Maximum change (+0.05R)
0.05% tolerance
Chip size
0.01% tolerance
0603 to 2512
0.25%
0.3%
0402 & 2010?
0603 to 2512
0.05%
Load life
Humidity
Short term overload
High temperature operation
Temperature cycle
1000 hours rated load @ 70°C
1000 hours @ 40°C, 90 - 95%RH
6.25 x rated Power , or 2 x LEV, for 5 sec
1000 hours at 125°C
0.5%
0.3%
0.5%
0.25%
0.1%
0.05%
0.05%
0.25%
0.05%
0.5%
0.25%
0.1%
5 cycles -55 C, 125°C
Resistance to solder heat
Solderability
270°C, 10 sec
235°C, 2 sec
0.2%
0.2%
0.05%
95% minimum coverage
Performance Data - High Power Range
Test Parameters
Conditions
Maximum change (+0.05R)
Load life
Humidity
Short term overload
High temperature operation
Temperature cycle
1000 hours rated load @ 70°C
1000hrs @ 40°C, 90 - 95%RH
6.25 x rated Power, or 2 x LEV, for 5 sec
1000 hours at 155°C
0.5%
0.5%
0.5%
0.5%
0.25%
5 cycles -55°C, 125°C
Resistance to solder heat
Solderability
0.2%
270°C, 10 sec
95% minimum coverage
235°C, 2 sec
Performance Data - Passivated Range
Test Parameters
Conditions
Maximum change (+0.05R)
0603 to 2512
0402
0.25%
0.5%
0.1%
0.5%
0.1%
0.1%
Load life
Humidity
0.05%
0.05%
0.02%
0.05%
0.02%
0.02%
1000 hours rated load @ 70°C
1000hrs @ 40°C, 90 - 95%RH
6.25 x rated Power, or 2 x LEV, for 5 sec
1000 hours at 125°C
Short term overload
High temperature operation
Temperature cycle
5 cycles -55 C, 125°C
Resistance to solder heat
Solderability
270°C, 10 sec
235°C, 2 sec
95% minimum coverage
Solderability
The terminations have an electroplated nickel barrier and tin coating. This ensures excellent 'leach' resistance properties and
solderability.
Packaging
PCF Resistors are supplied taped and reeled as per IEC 286-3.
Application Notes
PCF 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.
© 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
Issue J . 03.07
TTELEC [ TT Electronics ]
