Resistors
Precision Metal
Welwyn Components
Film Resistors
Precision Metal Film Resistors
PR series
PR series
Low cost precision resistors
Tolerances down to 0.1%
Low cost precision resistors
Tolerances down to 0.1%
TCR down to 15ppm/C
TCR down to 15ppm/C
All Pb-All Pb-frfreeee parts c parts comply omply with EU Dirwith EU Directivective e 2011/65/EU amended b2011/65/EU amended by y (EU) 2015/863 (R(EU) 2015/863 (RoHS3)oHS3)
Electrical Data
PR4 PR5
Power rating at 70C watts 0.5
0.25
Resistance range ohms 100R 1M
Limiting element voltage volts 250 350
TCR (20C to 70C) ppm/C
240K: 15, 25, 50 >240K: 25, 50
Resistance tolerance %
500K: 0.1, 0.25, 0.5, 1 >500K: 0.25, 0.5, 1
Standard values E24, E96
Thermal impedance C/watt 140 112
Ambient temperature range C -55 to 155
Physical Data
Dimensions (mm) & Weight (g)
PC Min. Wt. nom
mounting bend
centres radius
Type L Max D Max f min d nom
d
D
PR4 6.2 2.5 21 0.6 10.2 0.6 0.3
L f
12.7
PR5 9.0 3.6 19.6 0.8 1.2 0.5
Terminations
Construction
Material Hot tin dipped copper wire
The resistance element is a precisely controlled thin film of
Strength The terminations meet the requirements of
metal alloy sputtered on to a high purity ceramic core,
IEC 68.2.21
protected by a moisture-resistant, high dielectric strength
Solderability The terminations meet the requirements of
coating applied so that terminations remain completely clear.
IEC 115-1, Clause 4.17.3.2
This permits a well defined body length (clean lead to clean
Marking
lead dimension L).
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
BI Technologies IRC Welwyn
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 Welwyns own data and is considered accurate at time of going to print. A subsidiary of
All information is subject to TT Electronics own data and is considered accurate at time of going to print.
TT electronics plc
www.ttelectronics.com/resistors
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 03.10
TT Electronics plc
06.18
182PR_C.qxd 1/5/03 8:58 am Page 2
PR_C.qxd 1/5/03 8:58 am Page 2
Precision Metal
Film Resistors
Precision Metal Welwyn Components
Precision Metal
PR series
Film Resistors
Film Resistors
PR series
Welwyn Components
PR series
Performance Data
Maximum
Load: 1000 hours at 70C R % 0.5
Performance Data
Derating from rated power at 70C zero at 155C
Maximum
Short term overload R % 0.25
Load: 1000 hours at 70C R % 0.5
Climatic R % 0.5
Derating from rated power at 70C zero at 155C
Climatic category 55/125/56
Short term overload R % 0.25
Long term damp heat R % 0.5
Climatic R % 0.5
Temperature rapid change R % 0.25
Climatic category 55/125/56
Resistance to solder heat R % 0.25
Long term damp heat R % 0.5
Vibration and bump R % 0.1
Temperature rapid change R % 0.25
Insulation resistance ohms > 1G
Resistance to solder heat R % 0.25
Voltage proof volts PR4: 500 min, PR5: 700 min
Vibration and bump R % 0.1
Insulation resistance ohms > 1G
Packaging
Voltage proof volts PR4: 500 min, PR5: 700 min
All PR resistors are supplied tape packed ready for loading on
to automatic sequencing and insertion machines.
Packaging
5
Component wires will not protrude beyond the outside edge
All PR resistors are supplied tape packed ready for loading on
of the tapes.
to automatic sequencing and insertion machines.
5
Alternative packaging available by request.
Component wires will not protrude beyond the outside edge
f f
1 2
of the tapes.
52
6 6
Lead formed resistors can also be supplied. Standard options
Body location f f 1.4 mm
of Lancet, Radial and Goalpost forming are available. 1 2
Alternative packaging available by request.
f f
1 2
6 52 6
Lead formed resistors can also be supplied. Standard options
Body location f f 1.4 mm
of Lancet, Radial and Goalpost forming are available. 1 2
Ordering Procedure
Example: PR4 with TCR of 15ppm/C at 10 kilohms and 0.1% tolerance in an ammo pack box
of 5000 pieces -
Ordering Procedure
P R 4 Y 1 0 K B I
Example: PR4 with TCR of 15ppm/C at 10 kilohms and 0.1% tolerance in an ammo pack box
Type
of 5000 pieces -
P R 4 Y 1 0 K B I
TCR
Y 15 ppm/ C
Type
25 ppm/ C
C 50 ppm/ C
TCR
Y 15 ppm/ C
25 ppm/ C
Value (use IEC62 code)
C 50 ppm/ C
Tolerance (use IEC62 code)
B 0.1% D 0.5%
Value (use IEC62 code)
C 0.25% F 1%
Tolerance (use IEC62 code)
Packing
B 0.1% D 0.5%
PR4 5000/box
C 0.25% F 1%
I Ammo Standard
PR5 2500/box
Packing
PR4 5000/box
I Ammo Standard
PR5 2500/box
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
GenerTelephone:al Not +44e (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com 03.10
BI Technologies IRC Welwyn
TT Electronics reserves the right to make changes in product specification without notice or liability.
183
All information is subject to TT Electronics own data and is considered accurate at time of going to print.
www.ttelectronics.com/resistors
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
TT Electronics plcTelephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com 03.10
06.18
183