Vitreous Enamelled
Wirewound Resistors
V700 (RB Style) Series
Welwyn Components
•
BS/CECC approved
•
Stability for harsh environments
•
Overload characteristics ideal for
protection circuits
•
•
•
High stability and reliability
High power dissipation for size
Impervious lead free vitreous enamel coating
Electrical Data
V757
(RB57)
Power rating at 25°C
Resistance range
Limiting element voltage
TCR
Resistance tolerance
watts
ohms
volts
ppm/°C
%
7
0R1 to 20K
200
5
V758
(RB58)
11.0
0R2 to 82K
400
Typically: +75
V759
(RB59)
3.0
0R1 to 10K
100
V760
(RB60)
8.0
0R1 to 56K
250
Maximum +120
V761
(RB61)
5.0
0R1 to 15K
160
Closer tolerances to special order
Approved CECC 40201 - 001
Power rating at 25°C
Power rating at 70°C
Resistance range
Limiting element voltage
TCR
Resistance tolerance
Standard values
Thermal impedance
Ambient temperature range
°C/watt
°C
44
watts
watts
ohms
volts
ppm/°C
%
5
32
6.5
5.6
0R1 to 20K
160
>20 ohms ±500
5
88
-55 to 200
3.0
2.6
0R1 to 10K
63
8.0
6.9
250
≥20
ohms -50 +250
5
36
5
58
5.0
4.3
160
0R1 to 56K 0R15 to 15K
E24 preferred. Other values to special order
* See temperature rise in graph Application Notes
Physical Data
Maximum Dimensions (mm) and Weight (g)
Type
V757 (RB57)
V758 (RB58)
V759 (RB59)
V760 (RB60)
V761 (RB61)
L max
22.2
47
12.7
36
23
D max
8
11
5.6
10.0
7.0
f min
30
30
30
30
30
d max
0.88
0.88
0.88
0.88
0.88
Wt. Nom
2
9
1
4
2
d
D
L
f
Construction
A high purity ceramic substrate is assembled with force fit
end caps to which are welded the termination wires.
The resistive element is wound on the substrate and welded to
the caps; the vitreous enamel protective coating is then applied.
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.
A subsidiary of
TT electronics plc
Issue B · 03.02
© 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
87
WELWYN [ WELWYN COMPONENTS LIMITED ]
