Precision Metal
Precision Metal
Film Resistors
Film Resistors
PR series
PR series
Low cost precision resistors
Low cost
down to ±0.1%
Tolerances
precision resistors
Tolerances to 15ppm/°C
TCR down down to ±0.1%
TCR down to 15ppm/°C
Welwyn Components
·
·
·
Electrical Data
PR4
Power rating at 70°C
Resistance range
Limiting element voltage
TCR (20°C to 70°C)
Resistance tolerance
Standard values
Thermal impedance
Ambient temperature range
°C/watt
°C
140
-55 to 155
watts
ohms
volts
ppm/°C
%
250
≤240K:
15, 25, 50
≤500K:
0.1, 0.25, 0.5, 1
0.25
100R – 1M
350
>240K: 25, 50
>500K: 0.25, 0.5, 1
112
0.5
PR5
E24, E96
Physical Data
Dimensions (mm) & Weight (g)
PC
mounting
centres
10.2
12.7
Min.
bend
radius
Wt. nom
d
Type
PR4
PR5
L Max
6.2
9.0
D Max
2.5
3.6
f min
21
19.6
d nom
0.6
0.8
0.6
1.2
0.3
0.5
D
L
f
Construction
The resistance element is a precisely controlled thin film of
metal alloy sputtered on to a high purity ceramic core,
protected by a moisture-resistant, high dielectric strength
coating applied so that terminations remain completely clear.
This permits a well defined body length (clean lead to clean
lead dimension L).
Terminations
Material
Strength
Solderability
Hot tin dipped copper wire
The terminations meet the requirements of
IEC 68.2.21
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2
Marking
25ppm/°C resistors are colour coded with 5 bands. The other
grades have an additional 6th band indicating TCR which is
orange for 15ppm/°C and red for 50ppm/°C.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
General Note
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
TT electronics 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.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670
© TT electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
182
A subsidiary of
TT electronics plc
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
03.10
09. 11
Precision Metal
Film Resistors
Precision Metal
Precision Metal
PR series
Film Resistors
Film Resistors
PR series
PR series
Performance Data
Load: 1000 hours at 70°C
Performance Data
Derating from rated power at 70°C
Short term overload
Load: 1000 hours at 70°C
Climatic
Derating category ed power at 70°C
Climatic from rat
Short term damp heat
Long term overload
Climatic
Temperature rapid change
Climatic category heat
Resistance to solder
Long term damp heat
Vibration and bump
Temperature rapid change
Insulation resistance
Resistance to
Voltage proof solder heat
Vibration and bump
∆
R %
∆
R %
∆
R %
∆
R
∆
R
∆
R
∆
R
%
%
%
%
∆
R %
Welwyn Components
Welwyn Components
Maximum
0.5
zero at 155°C
Maximum
0.25
0.5
0.5
ze55/125/56 C
ro at 155°
0..5
025
025
0..5
55/125/56
0.25
0.5
0.1
0 25
> .1G
0.2
PR4: 500 min,5PR5: 700 min
0.1
> 1G
PR4: 500 min, PR5: 700 min
∆
R %
∆
R %
∆
R %
∆
R ms
oh %
∆
vo%
R lts
∆
R %
ohms
volts
Packaging
f
Voltage proo
Packaging
Insulation resistance
All PR resistors are supplied tape packed ready for loading on
to automatic sequencing and insertion machines.
Component wires will not protrude beyond thefor loading on
All PR resistors are supplied tape packed ready outside edge
of the tapes. sequencing and insertion machines.
to automatic
Alternative wires will not protrude beyond
Componentpackaging available by request. the outside edge
of the tapes.
Lead formed resistors can also be supplied. Standard options
of Lancet, Radial and Goalpost forming are available.
Alternative packaging available by request.
Lead formed resistors can also be supplied. Standard options
of Lancet, Radial and Goalpost forming are available.
5
5
f
1
6
52
f
2
6
Body location f
1
– f
2
≤
1.4 mm
f
1
f
2
52
6
6
Body location f
1
– f
2
≤
1.4 mm
Ordering Procedure
Example: PR4 with TCR of 15ppm/ °C at 10 kilohms and 0.1% tolerance in an ammo pack box
of 5000 pieces -
PR4Y
–
10KB
I
Example: PR4 with TCR of 15ppm/ °C at 10 kilohms and 0.1% tolerance in an ammo pack box
Type
of 5000 pieces -
PR4Y
–
10KB
I
TCR
Y
Type
15 ppm/
°C
25 ppm/
°C
C
TCR
50 ppm/
°C
Y
15 ppm/
°C
Value
25 ppm/
°C code)
(use IEC62
50 ppm/
°C
C
Tolerance (use IEC62 code)
B 0.1%
IEC62 code)
Value (use
D 0.5%
Ordering Procedure
C
0.25%
F
1%
Tolerance (use IEC62 code)
Packing
0.5%
B 0.1%
D
C
I
0.25%
AmmoF
PR4
1%
PR5
PR4
PR5
5000/box
2500/box
5000/box
2500/box
Standard
Packing
I
Ammo
Standard
03.10
183
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
General Note
1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44 (0)
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.
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670
© TT electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
03.10
09. 11
183
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