Precision Surface
Mount Resistors
PCF Series
Precision metal lm technology
Extended ohmic range 1R - 3M
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%
Electrical Data - Standard Range
Type
PCF0201
TCR
(ppm/ºC)
50
25
50
25
15
10
5
50
25
15
10
5
50
25
15
10
5
50
25
15
10
5
50
25
15
10
5
50
25
15
10
5
50
25
15
10
5
Power
(W)
0.031
Limiting Element
Voltage (V)
15
Ohmic Value Range*
0.5%
49R9-33K
1
49R9-5K
1
10R-205K
0.063
25
-
2R-1M
0.063
50
-
1R-2M
0.1
100
-
1R–2M5
0.125
150
-
1R–2M5
0.2
150
-
1R–3M
0.25
150
-
1R–3M
0.5
150
-
4R7-1M
4R7-332K
4R7-332K
24R9-15K
4R7-2M
4R7-511K
4R7-511K
24R9-30K
2
4R7-2M5
4R7-511K
4R7-1M
24R9-50K
2
4R7-2M5
4R7-1M
4R7-1M
24R9-50K
2
4R7-3M
4R7-1M
4R7-1M
24R9-100K
4R7-3M
4R7-1M
4R7-1M
24R9-100K
24R9-500K
-
24R9-500K
24R9-500K
24R9-50K
-
24R9-500K
24R9-50K
-
24R9-200K
24R9-30K
-
-
24R9-100K
49R9-33K
49R9-12K
49R9-5K
-
0.25%
0.1%
-
-
0.05%
0.01%
PCF0402
PCF0603
PCF0805
PCF1206
PCF1210
PCF2010
PCF2512
* Standard values E24 or E96. Other values may be available by request.
Note 1: PCF0201 also available in 1% tolerance. Note 2: Higher values available on request.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
A subsidiary of
TT electronics plc
08.10
© 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
PCF Series
Electrical Data - High Power Range
Type
TCR
(ppm/ºC)
50
25
15
10
5
50
25
15
10
5
50
25
15
10
5
50
25
15
10
5
Power
(W)
Limiting Element
Voltage (V)
Ohmic Value Range
0.5%
0.25%
0.1%
0.05%
0.01%
24R9-100K
4R7-332K
24R9-15K
0.125
150
4R7-1M
4R7-511K
24R9-30K
4R7-1M
24R9-50K
0.33
200
4R7-1M
24R9-50K
24R9-500K
24R9-500K
4R7-511K
24R9-200K
PCF0603H
0.1
75
PCF0805H
PCF1206H
0.25
200
PCF1210H
Electrical Data - Passivated Range
Type
PCF0402P
PCF0603P
PCF0805P
PCF1206P
PCF2010P
PCF2512P
TCR
(ppm/ºC)
50
25
15
50
25
15
50
25
15
50
25
15
50
25
15
50
25
15
Power
(W)
0.063
0.063
0.1
0.125
0.25
0.5
Limiting Element
Voltage (V)
25
50
100
150
150
150
Ohmic Value Range *
0.5%
0.25%
0.1%
25R-25K
49R9-12K
25R-332K
25R-100K
10R-800K
25R-200K
10R-1M
25R-500K
10R-1M
25R-500K
10R-1M
25R-500K
0.05%
0.01%
Physical Data
Dimensions (mm) & Weight (mg)
0201
0402
0603
0805
1206
1210
2010
2512
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
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
Tmax
0.26
0.40
0.55
0.65
0.65
0.50
0.65
0.65
* Standard values E24 or E96. Other values may be available by request.
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
Wt
1
3
6
9
20
25
36
55
C
T
A
L
A
W
Wrap-around terminations
(3 faces)
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.
© 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
08.10
Precision Surface Mount Resistors
PCF Series
Performance Data - Standard Range
Test Parameters
Conditions
Maximum change (+0.05R)
0.01% tolerance
0.05% tolerance
Chip size
0603 to 2512
0603 to 2512
0402
0.05%
0.25%
0.5%
0.05%
0.3%
0.3%
0.05%
0.5%
0.5%
0.25%
0.25%
0.25%
0.05%
0.1%
0.1%
0.05%
0.2%
0.2%
95% minimum coverage
Load life
Humidity
Short term overload
High temperature operation
Temperature cycle
Resistance to solder heat
Solderability
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
Performance Data - High Power Range
Test Parameters
Load life
Humidity
Short term overload
High temperature operation
Temperature cycle
Resistance to solder heat
Solderability
Conditions
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, 150°C
270°C, 10 sec
235°C, 2 sec
Maximum change (+0.05R)
0.5%
0.5%
0.5%
0.5%
0.25%
0.2%
95% minimum coverage
Performance Data - Passivated Range
Test Parameters
Load life
Humidity
Short term overload
High temperature operation
Temperature cycle
Resistance to solder heat
Solderability
Conditions
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
Maximum change (+0.05R)
0603 to 2512
0.05%
0.05%
0.02%
0.05%
0.02%
0.02%
0402
0.25%
0.5%
0.1%
0.5%
0.1%
0.1%
95% minimum coverage
Derating Curve
P/Pr
100%
0%
PCF,
PCF-P
70
125
PCF-H
155
T (°C)
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
08.10
Precision Surface Mount Resistors
PCF Series
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
P
kilohms
PCF
0603
- 11
-
1K54
B
I
Type
Size
Range
Standard
H
P
High Power
Passivated
TCR
13
12
11
5ppm/°C
R
25ppm/ °C
10ppm/°C 02 50ppm/ °C
15ppm/°C
Resistance value
(IEC62 Code)
Tolerance
L
W
B
0.01%
0.05%
0.1%
C
D
0.25%
0.5%
Packing
0201
0402
I
0603, 0805, 1206,
1210
2010, 2512
T1
0402, 0603, 0805,
1206, 2010, 2512
50,000/reel
10,000/reel
5000/reel
4000/reel
1000/reel
Please enquire to confirm
availability of 1000 piece reels
Standard
© 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
08.10
Switching Power Supply Study Group
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