A subsidiary of
TT electronics plc
08.10
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.
© 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 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%
* 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.
Electrical Data - Standard Range
PCF Series
Type TCR
(ppm/ºC)
Power
(W)
Limiting Element
Voltage (V)
Ohmic Value Range*
0.5% 0.25% 0.1% 0.05% 0.01%
PCF0201 50 0.031 15 49R9-33K 1
-
25 49R9-5K 1
PCF0402
50
0.063 25
10R-205K -
25
15
-
49R9-33K
10 49R9-12K
5 49R9-5K
PCF0603
50
0.063 50
2R-1M 4R7-1M
4R7-332K
-
25
15
-4R7-332K 24R9-100K
10
5 24R9-15K
PCF0805
50
0.1 100
1R-2M 4R7-2M
4R7-511K
-
25
15
-4R7-511K 24R9-200K
10
5 24R9-30K 224R9-30K
PCF1206
50
0.125 150
1R–2M5 4R7-2M5
4R7-511K
-
25
15
-4R7-1M 24R9-500K
10
5 24R9-50K 224R9-50K
PCF1210
50
0.2 150
1R–2M5 4R7-2M5
4R7-1M
-
25
15
-4R7-1M 24R9-500K
10
5 24R9-50K 224R9-50K
PCF2010
50
0.25 150
1R–3M 4R7-3M
4R7-1M
-
25
15
-4R7-1M 24R9-500K
10
5 24R9-100K
PCF2512
50
0.5 150
1R–3M 4R7-3M
4R7-1M
-
25
15
-4R7-1M 24R9-500K
10
5 24R9-100K
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.
* Standard values E24 or E96. Other values may be available by request.
Precision Surface Mount Resistors
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) & Weight (mg)
Wt
1
3
6
9
20
25
36
55
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
PCF Series
Physical Data
Electrical Data - High Power Range
Electrical Data - Passivated Range
Type TCR
(ppm/ºC)
Power
(W)
Limiting Element
Voltage (V)
Ohmic Value Range
0.5% 0.25% 0.1% 0.05% 0.01%
PCF0603H
50
0.1 75 4R7-332K 24R9-100K
25
15
10
5 24R9-15K
PCF0805H
50
0.125 150
4R7-1M 4R7-511K 24R9-200K
25
15
10 4R7-511K
5 24R9-30K
PCF1206H
50
0.25 200 4R7-1M 24R9-500K
25
15
10
5 24R9-50K
PCF1210H
50
0.33 200 4R7-1M 24R9-500K
25
15
10
5 24R9-50K
Type TCR
(ppm/ºC)
Power
(W)
Limiting Element
Voltage (V)
Ohmic Value Range *
0.5% 0.25% 0.1% 0.05% 0.01%
PCF0402P
50
0.063 25 25R-25K
25
15 49R9-12K
PCF0603P
50
0.063 50 25R-332K
25
15 25R-100K
PCF0805P
50
0.1 100 10R-800K
25
15 25R-200K
PCF1206P
50
0.125 150 10R-1M
25
15 25R-500K
PCF2010P
50
0.25 150 10R-1M
25
15 25R-500K
PCF2512P
50
0.5 150 10R-1M
25
15 25R-500K
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
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, 150°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
Derating Curve
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
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
PCF Series
Performance Data - Standard Range
Performance Data - High Power Range
Performance Data - Passivated Range
0%
100%
T (°C)
70
125
155
P/Pr
PCF,
PCF-P
PCF-H
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
kilohms
are used.
Ordering Procedure
Precision Surface Mount Resistors
PCF 0603 - 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
02
Standard
High Power
Passivated
H
P
TCR
Resistance value
(IEC62 Code)
Tolerance
Packing
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
PCF Series
P
