Precision Metal
Metal
Precision
Film Resistors
Film Resistors
Welwyn Components
PR series
PR series
•
Low cost precision resistors
•
Tolerances down to ±0.1%
Features
Low
down to 15ppm/°C
•
TCR
cost precision resistors
Tolerances down to ±0.1%
TCR down to 15ppm/°C
All parts are Pb-free and comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
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.
BI Technologies IRC Welwyn
© 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.ttelectronics.com/resistors
03.10
09.21
Precision Metal
Precision Metal Film Resistors
PR series
PR series
Film Resistors
Welwyn Components
Performance Data
Maximum
Load: 1000 hours at 70°C
Derating from rated power at 70° C
Short term overload
Climatic
Climatic category
Long term damp heat
Temperature rapid change
Resistance to solder heat
Vibration and bump
Insulation resistance
Voltage proof
∆
R %
∆
R %
∆
R %
∆
R %
ohms
volts
∆
R %
∆
R %
∆
R %
0.5
zero at 155° C
0.25
0.5
55/155/56
0.5
0.25
0.25
0.1
> 1G
PR4: 500 min, PR5: 700 min
Packaging
All PR resistors are supplied tape packed ready for loading on
to automatic sequencing and insertion machines.
Component wires will not protrude beyond the outside edge
of the tapes.
Alternative packaging available by request.
Lead formed resistors can also be supplied. Standard options
of Lancet, Radial and Goalpost forming are available.
6
f
1
52
1
5
f
2
6
– f
2
≤
1.4 mm
Body location f
Ordering Procedure
Example: PR4Y-10KBI
(PR4
Ordering Procedure
with TCR ±15ppm/°C at 10 kilohms ±0.1%, Pb-free)
Example: PR4 with TCR of 15ppm/ °C at 10 kilohms and 0.1% tolerance in an ammo pack box
P R 4 Y
-
1 0 K
B I
of 5000 pieces -
1
2
3
4 5
PR4Y
–
10KB
I
Type
TCR
Y
1
2
3
4
Tolerance
B = ±0.1%
C = ±0.25%
D = ±0.5%
F = ±1%
I
5
Packing
Ammo
PR4 5000/box
PR5 2500/box
Type
TCR
Value
15 ppm/
°C
PR4
Y = ±15ppm/°C
E24 = 3/4 characters
25 ppm/
°C
PR5 Blank = ±25ppm/°C E96 = 3/4 characters
50 ppm/
°C
C
C = ±50ppm/°C
R = ohms
K = kilohms
M = megohms
Value (use IEC62 code)
Tolerance (use IEC62 code)
B
C
0.1%
0.25%
D
F
0.5%
1%
Packing
I
General Note
Ammo
PR4
PR5
5000/box
2500/box
Standard
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
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670
03.10
09.21
183
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