A subsidiary of
TT electronics plc
Issue J . 03.07
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyns 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
Precision Surface
Mount Resistors
Precision metal film technology
Extended ohmic range 1R - 2M
Precision to
±
0.01% and 5ppm/°C
TCR grades 50, 25, 15, 10, 5ppm/°C
Passivated range for superior humidity performance
Load life stability and humidity to 0.05%
Power
(W)
PCF0201
PCF0402
PCF0603
PCF0805
PCF1206
PCF1210
PCF2010
PCF2512
0.05
0.063
0.063
0.1
0.125
0.25
0.25
0.5
Type TCR
(ppm/°C
Limiting
Element
Voltage (V)
100
25
50
25
15
10
5
50
25
15
10
5
50
25
15
10
5
50
25
15
10
5
25
10
5
50
25
15
10
5
50
25
15
10
5
15
25
75
100
150
200
150
150
Ohmic Value Range *
0.1%
10R-200K
10R-200K
50R-12K
50R-12K
50R-2K
4R7-800K
4R7-800K
4R7-332K
4R7-332K
50R-4K
4R7-2M
4R7-2M
4R7-1M
4R7-1M
50R-10K
4R7-1M
4R7-1M
4R7-1M
4R7-1M
50R-15K
51R-2M
100R-330K
100R-200K
4R7-1M
4R7-1M
4R7-1M
4R7-1M
25R-25K
4R7-1M
4R7-1M
4R7-1M
4R7-1M
25R-25K
0.5%
10R-30R (1%)
33R -22K
10R-200K
10R-200K
50R-12K
2R-800K
2R-800K
4R7-332K
1R-2M
1R-2M
4R7-500K
1R-2M
1R-2M
4R7-1M
51R-2M
100R-330K
100R-200K
1R-2M
1R-2M
4R7-1M
1R-2M
1R-2M
4R7-1M
0.25%
10R-200K
10R-200K
50R-12K
2R-800K
2R-800K
4R7-332K
1R-2M
1R-2M
4R7-500K
1R-2M
1R-2M
4R7-1M
1R-2M
1R-2M
4R7-1M
1R-2M
1R-2M
4R7-1M
0.05%
50R-12K
50R-12K
50R-12K
50R-2K
4R7-150K
4R7-150K
25R-100K
50R-4K
4R7-500K
4R7-500K
25R-200K
50R-10K
4R7-1M
4R7-1M
25R-500K
50R-15K
4R7-1M
4R7-1M
25R-500K
25R-25K
4R7-1M
4R7-1M
25R-500K
25R-25K
0.01%
50R-12K
50R-12K
50R-12K
50R-12K
50R-2K
25R-100K
25R-100K
25R-100K
25R-100K
50R-4K
25R-200K
25R-200K
25R-200K
25R-200K
50R-10K
25R-500K
25R-500K
25R-500K
25R-500K
50R-15K
25R-500K
25R-500K
25R-500K
25R-500K
25R-25K
25R-500K
25R-500K
25R-500K
25R-500K
25R-25K
* Standard values E24 or E96. Other values may be available by request.
Electrical Data - Standard Range
PCF Series
Construction
A thin-film material is selectively deposited on a 96% alumina substrate together with metallic contacts at each end of the resistor.
The unadjusted resistors are heat treated to give the required TCR and stability, then a precisely controlled laser trim process adjusts
the resistance value. Epoxy protection is applied and wrap-around terminations are added and plated with Nickel then Tin. Each
resistor is measured immediately before packing into tape.
Terminations
The chips are supplied with 100% Sn matte plated wrap-around terminations suitable for soldering.
Precision Surface Mount Resistors
Issue J . 03.07
© 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
PCF Series
W
0.3 ± 0.05
0.5 ± 0.05
0.8 ± 0.2
1.25 ± 0.2
1.6 ± 0.2
2.6 ± 0.2
2.4 ± 0.2
3.1 ± 0.2
L
0.6 ± 0.05
1.0 ± 0.05
1.6 ± 0.2
2.0 ± 0.2
3.2 ± 0.2
3.2 ± 0.2
4.9 ± 0.2
6.3 ± 0.2
Tmax
0.26
0.40
0.55
0.65
0.65
0.50
0.65
0.65
A
0.12 ± 0.05
0.2 ± 0.1
0.3 ± 0.2
0.4 ± 0.2
0.5 ± 0.2
0.45 ± 0.2
0.5 ± 0.2
0.5 ± 0.2
C
0.12 ± 0.05
0.2 ± 0.1
0.3 ± 0.2
0.4 ± 0.2
0.5 ± 0.2
0.5 ± 0.2
0.6 ± 0.2
0.6 ± 0.2
T
W
A
A
L
Wrap-around terminations
(3 faces)
C
0201
0402
0603
0805
1206
1210
2010
2512
Dimensions (mm)
Physical Data
* Standard values E24 or E96. Other values may be available by request.
50
25
50
25
50
25
PCF0603H
PCF0805H
PCF1206H
0.1
0.125
0.25
0.5%
10R-332K
10R-332K
4R7-1M
4R7-1M
4R7-1M
4R7-1M
Power
(W)
Type TCR
(ppm/°C
Limiting
Element
Voltage (V)
Ohmic Value Range *
0.25%
10R-332K
10R-332K
4R7-1M
4R7-1M
4R7-1M
4R7-1M
0.1%
10R-332K
10R-332K
4R7-1M
4R7-1M
4R7-1M
4R7-1M
50
150
200
Electrical Data - High Power Range
0.5%
25R-25K
25R-25K
25R-200K
25R-200K
25R-400K
25R-400K
25R-500K
25R-500K
25R-600K
25R-600K
25R-600K
25R-600K
Power
(W)
Type TCR
(ppm/°C
Limiting
Element
Voltage (V)
50
25
50
25
50
25
50
25
50
25
50
25
Ohmic Value Range *
0.25%
25R-25K
25R-25K
25R-200K
25R-200K
25R-400K
25R-400K
25R-500K
25R-500K
25R-600K
25R-600K
25R-600K
25R-600K
0.1%
25R-25K
25R-25K
25R-200K
25R-200K
25R-400K
25R-400K
25R-500K
25R-500K
25R-600K
25R-600K
25R-600K
25R-600K
PCF0402P
PCF0603P
PCF0805P
PCF1206P
PCF2010P
PCF2512P
0.063
0.063
0.1
0.125
0.25
0.5
25
50
100
150
150
150
* Standard values E24 or E96. Other values may be available by request.
Electrical Data - Passivated Range
0.05% tolerance
0603 to 2512
0.25%
0.3%
0.5%
0.25%
0.1%
0.2%
Load life
Humidity
Short term overload
High temperature operation
Temperature cycle
Resistance to solder heat
Solderability
Maximum change (+0.05R)
Chip size
0402 & 2010?
0.5%
0.3%
0.5%
0.25%
0.1%
0.2%
0.01% tolerance
0603 to 2512
0.05%
0.05%
0.05%
0.25%
0.05%
0.05%
ConditionsTest Parameters
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
5 cycles -55 C, 125°C
270°C, 10 sec
235°C, 2 sec 95% minimum coverage
0.5%
0.5%
0.5%
0.5%
0.25%
0.2%
95% minimum coverage
Load life
Humidity
Short term overload
High temperature operation
Temperature cycle
Resistance to solder heat
Solderability
Maximum change (+0.05R)ConditionsTest Parameters
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
5 cycles -55°C, 125°C
270°C, 10 sec
235°C, 2 sec
0603 to 2512
0.05%
0.05%
0.02%
0.05%
0.02%
0.02%
Load life
Humidity
Short term overload
High temperature operation
Temperature cycle
Resistance to solder heat
Solderability
Maximum change (+0.05R)ConditionsTest Parameters
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
5 cycles -55 C, 125°C
270°C, 10 sec
235°C, 2 sec 95% minimum coverage
0402
0.25%
0.5%
0.1%
0.5%
0.1%
0.1%
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.
Precision Surface Mount Resistors
Issue J . 03.07
© 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
PCF Series
Performance Data - Standard Range
Performance Data - High Power Range
Performance Data - Passivated Range
Type
Size
Range
Wrap-around terminations provide good leach properties and ensure reliable contact. Due to the robust construction, the PCF can
be immersed in the solder bath for 30 seconds at 260 C. This enables the resistor to be mounted on one side of a printed circuit
board and wire-leaded components applied on the other side.
PCF resistors themselves can operate at a maximum temperature of 125 C (see performance above) (155 C for High Power grades).
For soldered resistors, the joint temperature should not exceed 110 C. This condition is met when the stated power levels at 70 C
are used.
Ordering Procedure
Precision Surface Mount Resistors
PCF 0603 P - 11 - 1K54 B I
50,000/reel
10,000/reel
5000/reel
4000/reel
1000/reel
I
0201
0402
0603, 0805, 1206,
1210
2010, 2512
0402, 0603, 0805,
1206, 2010, 2512
Standard
T1 Please enquire to confirm
availability of 1000 piece reels
0.25%
0.5%
0.01%
0.05%
0.1%
L
W
B
C
D
25ppm/ °C
50ppm/ °C
5ppm/°C
10ppm/°C
15ppm/°C
13
12
11
R
2
Standard
High Power
Passivated
H
P
TCR
Resistance value
(IEC62 Code)
Tolerance
Packing
Issue J . 03.07
© 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
PCF Series
