Resistors
Precision
PCR_D.qxd
Thick Film
Precision Thick Film
Surface Mounted Resistors
8/9/04
3:54 PM
Page 1
Surface Mounted Resistors
PCR Series
Welwyn Components
Precision Thick Film
•
Tolerance
Surface Mounted Resistors
PCR Series
down to 0.1%
•
•
Excellent load stability
Tolerance down to 0.1%
Termination available
Excellent load stability
for wire bonding or
PCR Series
soldering
Termination available for wire bonding or soldering
•
Tolerance down to 0.1%
Resistance range 10 ohms to 1M
•
Resistance range 10 ohms to 1M ohms
ohms
•
Excellent load stability
Any resistance value available within specified range
•
Any resistance value available within
specified range
soldering
Welwyn Components
•
•
•
Termination available for wire bonding or
All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
Resistance range 10 ohms to 1M ohms
Electrical Data
Power rating at 70°C
Resistance range
Any resistance value available within
specified range
PCR0805
PCR1005
0.125
PCR0805
PCR1206
0.25
Notes
Electrical Data
watts
ohms
volts
ppm/°C
ppm/°C
%
°C/watt
°C
0.1
100
watts
ohms
volts
ppm/°C
ppm/°C
%
10R to 1M
0.1
150
Limiting element voltage
Power rating at 70°C
TCR -55°C to +155°C
Resistance range
TCR +20°C to +70°C
Limiting element voltage
Resistance tolerance
Values
Thermal impedance
TCR -55°C to +155°C
TCR +20°C to +70°C
Resistance tolerance
Values
Thermal impedance
PCR1005
0.125
200
150
50
PCR1206
0.25
200
Notes
100
10R to 1M
100
50
0.1, 0.25, 0.5,
100
1
E24 & E96 preferred
290
360
0.1, 0.25, 0.5, 1
290
-55 to 155
Any value to order
For 10 devices mounted
Any value to order
360
E24 & E96 preferred
200
°C/watt
°C
x 25
devices mounted
200
on a 50
For 10
mm p.c.b. area
on a 50 x 25 mm p.c.b. area
Ambient temperature range*
-55 to 155
*See Application Notes
Ambient temperature range*
*See Application Notes
Physical Data
Physical Data
Dimensions (mm) & weight (mg)
of standard styles
(g)
& Weight (g)
Dimensions of standard styles (mm) & Weight
(mm)
Dimensions
L
Style
0805
0805
1005
1206
L
2.0±0.15
Style
W
W
T max
0.6
0.7
Wrap around
min*
around
C
A
B
Wrap
planar
0.3 ± 0.15
0.9min
A
B*
0.9
0.3 ± 0.15
0.4 ± 0.2
1.7
planar
C
Wt
Wt.
4.7
Wt
0.009
A
B
L
T
A
B
L
A
W
T
1005
1206
2.0 ± 0.3 1.25 ± 0.2
2.5 ± 0.3 1.25 ± 0.2
2.5±0.2
3.2±0.2
L
W
T
A
1.25±0.15
T
0.6
0.3±0.15
0805
2.0 ± 0.3 1.25 ± 0.2
0.6
C
B*
C
C
1.25±0.2
± 0.3
0.7
± 0.2
1005
2.5
1.25
Planar terminations
mounting resistors
3.2 ± 0.4 1.6 ± 0.2
0.7
0.4 ± 0.2 1.7min 0.4 0.15
0.020
*This dimension determines the number of conductors which may pass under the surface mounted device.
1206
3.2
1.6
0.7
1.6±0.2
± 0.4
0.7
± 0.2
0.4±0.2
Not available
Not applicable
available
0.4±0.15
± 0.15 0.015
6.5
0.7
Not
0.4
0.4 ± 0.15
1.7min 0.4 0.15
8.5
0.4±0.15
0.3 ± 0.1
0.9min
0.3±0.1
0.3 ± 0.1
0.009
0.015
(3 faces)
Wrap-around terminations
(3 faces)
Wrap-around terminations
L
W
A
W
C
T
C
T
Alternative styles for surface
mounting
surface
0.020
Alternative styles for
resistors
L
W
Planar terminations
*This dimension determines the number of conductors which may pass under the surface mounted device.
Construction
Terminations
Construction
Thick film resistor material, overglaze and organic protection
are screen printed on a 96% alumina substrate.
Adjustment
Thick film resistor material, overglaze and organic protection
Planar (or single-sided) termination is gold and suitable for
Terminations
are screen printed on a 96% alumina substrate.
wire-bonding; wrap around is suitable for soldering.
Planar (or single-sided) termination is gold and suitable for
wire-bonding; wrap around is suitable for soldering.
Solderability
The components are adjusted to final value using a specially
Wrap-around terminations have an electroplated nickel barrier
developed technique, which assures optimum load stability
and solder
Adjustment
Solderability
coating, this ensures excellent ‘leach’ resistance
performance.
properties and solderability. They will withstand immersion in
The components are adjusted to final value using a specially
Wrap-around terminations have an electroplated nickel barrier
solder at 260°C for 30 seconds.
developed technique, which assures optimum load stability
performance.
General Note
and solder coating, this ensures excellent ‘leach’ resistance
properties and solderability. They will withstand immersion in
solder at 260°C for 30 seconds.
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.
General Note
General Note
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
A subsidiary of
TT electronics plc
Issue D · 08.04
BI Technologies IRC Welwyn
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
TT Electronics reserves the right to make changes in product specification without notice
without notice or liability.
Welwyn Components reserves the right to make changes in product specification
or liability.
All information
subject to
to
Electronics’ own data and
considered accurate at time
going to
to print.
All information is
is subject
TT
Welwyn’s own data and is
considered accurate at time of
of going
print.
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT Electronics plc
A subsidiary of
www.ttelectronics.com/resistors
TT electronics plc
Issue D · 08.04
06.20
33
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
33
Precision Thick Film
Precision Thick Film
Surface Mounted Resistors
Surface Mounted Resistors
PCR Series
PCR Series
Welwyn Components
Performance Data
Maximum
Load at rated power: 1000 hours at 70°C
Load at rated power: 8000 hours at 70°C
Load at 50% rated power: 1000 hours at 70°C
Load at 50% rated power: 8000 hours at 70°C
Shelf life: 12 months at room temperature
Derating from rated power at 70°C
Overload
Dry heat: 1000 hours at 155°C
Long term damp heat
Temperature rapid change
Resistance to solder heat
Voltage proof
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
volts
0.1
0.1
0.03
0.10
500
∆R%
∆R%
∆R%
∆R%
∆
R%
10 - 25k: 0.10
>25k - 1M: 0.4
10 - 25k: 0.20
>25k - 1M: 0.80
10 - 1M: 0.10
10 - 1M: 0.20
0.05
Zero at 155°C
0.04
0.04
0.04
0.01
0.02
Typical
10 - 25k: 0.05
>25k - 1M: 0.2
10 - 25k: 0.10
>25k - 1M: 0.4
10 - 1M: 0.03
10 - 1M: 0.06
0.01
Value Ranges
Size/Tol.%
PCR0805
PCR1005
PCR1206
1
10 to 1M
10 to 1M
10 to 1M
0.5
10 to 1M
10 to 1M
10 to 1M
0.25
100 to 1M
100 to 1M
100 to 1M
0.1
100 to 1M
100 to 1M
100 to 1M
Application Notes
Operating Temperature Range
The chips can operate at a maximum temperature of 155°C
(see Performance Data). For soldered chips, the joint
temperature should not exceed 110°C. This condition is met
when the stated power levels at 70°C are used.
Packaging
Resistor chips are supplied taped and reeled on standard 8mm
tape to IEC 286-3.
Quantity per reel 3000 max.
Mounting
This chip resistor is ideally suited for handling by automatic
methods due to its rectangular shape and the small
dimensional tolerances. Electrical connection to a ceramic
substrate or to a printed circuit board can be made by wire
bonding (eg suffix ‘G’ in PCR0805G) or by reflow soldering of
wrap-around terminations (eg suffix ‘F’ in PCR0805F). The ‘F’
terminations provide good leach properties and ensure
reliable contact. Due to the robust construction the resistor
chip 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 and other wire-leaded components on the
other side.
Planar Terminations
Resistor chips are supplied in waffle packs.
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
© TT Electronics plc
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
34
Issue D · 08.04
06.20
PCB Design
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