WELWYN PR4

PR_C.qxd
1/5/03
8:58 am
Page 1
Precision Metal
Film Resistors
Welwyn Components
PR series
• Low cost precision resistors
• Tolerances down to ±0.1%
• TCR down to 15ppm/°C
Electrical Data
PR4
PR5
Power rating at 70°C
watts
0.25
0.5
Resistance range
ohms
100R – 240K
100R – 1M
volts
250
350
ppm/°C
25
25
0.1, 0.25, 0.5, 1
0.1, 0.25, 0.5, 1
E192
E192
Limiting element voltage
TCR*
Resistance tolerance
%
Standard values
Thermal impedance
°C/watt
Ambient temperature range
140
112
°C
-55 to 155
*15ppm/°C available by request
Physical Data
Dimensions (mm) & Weight (g)
PCB
Min.
mounting bend
radius
Wt.nom
Type
L Max
D Max
f min
d nom
centres
PR4
6.2
2.5
21
0.6
10.2
0.6
0.3
PR5
9.0
3.6
19.6
0.8
12.7
1.2
0.5
Construction
Terminations
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.
Material
Strength
This permits a well defined body length (clean lead to clean
lead dimension L).
Solderability
d
D
L
f
Solder-coated 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
Resistors are colour coded with 5 bands. IEC 62 colours are
used.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
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: [email protected] · Website: www.welwyn-tt.com
182
A subsidiary of
TT electronics plc
Issue C · 04.03
PR_C.qxd
1/5/03
8:58 am
Page 2
Precision Metal
Film Resistors
Welwyn Components
PR series
Performance Data
Maximum
∆R %
Load: 1000 hours at 70°C
0.5
Derating from rated power at 70°C
zero at 155°C
Short term overload
∆R %
Climatic
∆R %
0.25
0.5
Climatic category
55/125/56
Long term damp heat
∆R %
0.5
Temperature rapid change
∆R %
0.25
Resistance to solder heat
∆R %
0.25
Vibration and bump
∆R %
0.1
Insulation resistance
ohms
> 1G
volts
400 min
Voltage proof
Packaging
All PR resistors are supplied tape packed ready for loading on
to automatic sequencing and insertion machines.
5
Component wires will not protrude beyond the outside edge
of the tapes.
Alternative packaging available by request.
f1
Lead Formed resistors can also be supplied. Standard options
of Lancet, Radial and Goalpost forming are shown in the Lead
Form Information section.
6
f2
52
6
Body location f1 – f2 ≤ 1.4 mm
Standard Quantities Per Package
Type
PR4
PR5
Large ammo pack
5000
2500
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com
Issue C · 04.03
183