Vitreous
Resistors
Enamelled
Wirewound Resistors
Vitreous Enamelled Wire-
wound Resistors
Wirewound Resistors
V700 (RB Style) Series
harsh
•
Stability for
Series
V700 (RB Style) Series
environments
V700 (RB Style)
•
Overload characteristics ideal for
Stability for
harsh environments
Stability for
circuits
protection
harsh environments
Overload characteristics ideal for protection circuits
Overload characteristics ideal for protection circuits
•
High stability and reliability
High stability and reliability
High stability and reliability
•
High power dissipation for size
High power dissipation for size
High power dissipation for size
•
Impervious lead free vitreous enamel coating
Impervious lead free vitreous enamel coating
Impervious lead free vitreous enamel coating
Make Possible
Welwyn Components
All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
Power rating at 25°C
Resistance range
Limiting element voltage
TCR
Resistance tolerance
Standard values
Thermal impedance
Ambient temperature range
°C
-55 to 200
ppm/°C
%
Typically: +75
5
Maximum +120
Closer tolerances to special order
E24 preferred. Other values to special order
Physical Data
Maximum Dimensions (mm) and Weight (g)
Type
V757 (RB57)
V759 (RB59)
V761 (RB61)
L max
22.2
12.7
23
D max
8
5.6
7.0
f min
30
30
30
d max
0.88
0.88
0.88
Wt. Nom
2
1
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
General
Note
General
Note
Welwyn Components reserves the right to make changes in product specification
or liability.
TT Electronics reserves the right to make changes in product specification without notice
without notice or liability.
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information
subject to TT Electronics’ own data and is
considered accurate
time of going to
to print.
All information is
is subject to Welwyn’s own data and is
considered accurate at
at time of going
print.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
A subsidiary of
www.ttelectronics.com/resistors
TT electronics plc
www.ttelectronicsresistors.com
© 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
© TT Electronics plc
03. 08
06.18
07.14
87
Vitreous Enamelled
Vitreous Enamelled
Vitreous Enamelled
Wirewound Resistors
Vitreous Enamelled
Vitreous Enamelled
Wirewound Resistors
Wirewound Resistors
Wirewound Resistors
V700 (RB Style) Series
V700 (RB Style) Series
Wirewound Resistors
V700 (RB Style) Series
V700 (RB Style) Series
V700
(RB Style) Series
V700
(RB Style) Series
Terminations
Terminations
Terminations
Material
Copper clad steel wire, nickel plated and
Material
Copper clad steel wire, nickel plated and
Material
Copper clad steel wire, nickel plated and
Terminations
solder-coated.
solder-coated.
Material
solder-coated.
Copper clad steel wire, nickel plated and
solder-coated.
Welwyn
Welwyn
Welwyn
Strength
Strength
Strength
Strength
Solderability
Solderability
Solderability
Solderability
Components
Make Possible
Components
Components
Performance
Performance
Performance
Data
Data
Data
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
The terminations meet requirements of
The terminations meet requirements of
The terminations meet requirements of
IEC 68.2.21.
IEC 68.2.21.
IEC 68.2.21.
The terminations meet requirements of
IEC terminations meet the requirements
The 68.2.21.
The terminations meet the requirements
The terminations meet
115-1, Clause 4.17.3.2.the requirements
115-1, Clause 4.17.3.2.
115-1, Clause 4.17.3.2.
The terminations meet the requirements
115-1, Clause 4.17.3.2.
of
of
of
of
IEC
IEC
IEC
IEC
Load at rated power: 1000 hrs
Load at rated power: 1000 hrs
Load at rated power: at 200°c
Dry heat: 1000 hours 1000 hrs
Dry heat: 1000 hours at 200°c
Load at rated power: 1000 hrs
Dry heat: 12 mths at at 200°c
Shelf life: 1000 hours room temp
Shelf life: 12 mths at room temp
Dry heat: 1000 hours room
Shelf life: 12 mths at at 200°c25°C
Derating from rated power temp
Derating from rated power at 25°C
at
Shelf life:from rated power temp
Derating 12 mths at room at 25°C
Short term overload
Short term overload
Derating from rated power at 25°C
Short term
Climatic overload
Climatic
Short term overload
Climatic
Climatic category
Climatic category
Climatic category
Long term damp heat
Long term damp heat
Climatic category heat
Long term damp
Temperature rapid change
Temperature rapid change
Long term damp heat
Temperature solder heat
Resistance to rapid change
Resistance to solder heat
Temperature rapid change
Resistance
Vibration to solder heat
Vibration
Resistance to solder heat
Vibration
Noise (µV/V in a decade of freqency)
Noise (µV/V in a decade of freqency)
Vibration
Noise
Shock (µV/V in a decade of freqency)
Shock
Noise (µV/V in a decade of freqency)
Shock
Pulse handling
Pulse handling
Shockhandling
Pulse
Pulse handling
Actual Performance
Actual Performance
Maximum Actual Performance Typical
Maximum
Typical
Maximum Actual Performance Typical
5
3.5
5
3.5
Maximum
Typical
5
3.5
2
1
2
1
5
3.5
2
1
0.03
0.02
0.03
0.02
2
0.03
0.02
1
See derating curve
See derating curve
0.03
0.02
See derating curve
1.5
0.5
1.5
0.5
See derating curve
1.5
0.5
0.5
0.2
0.5
0.2
1.5
0.5
0.5
0.2
55/200/56
55/200/56
55/200/56
55/200/56
0.5
0.2
55/200/56
55/200/56
0.05
0.02
0.05
0.02
55/200/56
55/200/56
0.05
0.02
0.5
0.05
0.5
0.05
0.05
0.02
0.5
0.05
0.25
0.03
0.25
0.03
0.5
0.05
0.25
0.03
0.25
0.05
0.25
0.05
0.25
0.03
0.05
zero
zero
0.25
0.05
zero
0.2
0.05
0.2
0.05
zero
0.2
Data available by request 0.05
Data available by request
0.2
Data available by request 0.05
Data available by request
116
116
116
100
100
116
100
100
54
54
54
54
0
0
0 25
25
25
0
25
70
70
70
Ambient
200
200
200
temperature
315
315
315
315
the body, and the recommended minimum bend radius is
the terminations are to dissipate full rated power, the
The body, resistorsrecommended minimum than radius from
1.2mm. If and theshould not be bent closer bend 1.6mmis
1.2mm. If resistors are to dissipate full rated power, the
1.2mm. If resistors are to dissipate full ratedbend radius is
power, the
the body, and the recommended minimum than 4mm from
terminations should not be soldered closer than 4mm from
terminations should not be soldered closer
terminations should not be soldered closer than 4mm from
1.2mm. If
the body. resistors are to dissipate full rated power, the
the body.
the body.
terminations should not be soldered closer than 4mm from
the body. vitreous enamel has excellent insulation
When cold, vitreous enamel has excellent insulation
When cold,
When cold, vitreous enamel has excellent insulation
resistance. In common with all insulants the specific resistance
resistance. In common with all insulants the specific resistance
resistance. vitreous enamel has excellenttemperature.
When enamel decreases with insulants insulation
of the cold,In common with allincrease inthe specific resistance
of the enamel decreases with increase in temperature.
of the enamelcommon with
decreases with near maximum temperature
resistance. resistors operated atinsulants temperature.
Therefore, resistors operatedallincrease inthe specific resistance
Therefore, In
at near maximum temperature
Therefore, classed as insulatedincrease in temperature.
resistors operated near maximum temperature
of the be classed as insulated and should not be used in
cannotenamel decreases withatand should not be used in
cannot be
cannot with any as insulated near maximum temperature
Therefore, resistors operated material.
contact be classedconducting atand should not be used in
contact with any conducting material.
contact be classedconducting material.
cannot with any as insulated and should not be used in
contact with taken when determining
Care must beany conducting material. clearance distance
Care must be taken when determining clearance distance
Care must be taken
between the resistorwhen determining clearance distance
body and the printed circuit board or
between the resistor body and the printed circuit board or
printed circuit board
between the resistorwhen determining not over heated. or
Care must be taken body and the are not over heated.
other components to ensure these are clearance distance
other components to ensure these
other components tobody and the are not over heated. or
ensure
between the measured 6mm from the body.
Resistance is measured 6mm these the body.
from printed circuit board
Resistance is resistor
Resistance is measured 6mm these the body.
other components to ensure from are not over heated.
Resistance is measured 6mm from the body.
Type
Type
Type
V759
V759
Type
V759
V757
V757
V759
V757
V761
V761
V757
V761
V761
L
L
L
63
63
L
63
73
73
63
73
73
73
73
73
10
10
10
10
f
1
f
1
f
1
f
2
f
2
f
2
% of% of Rated Power
% % of Rated Power
Rated Power
of Rated Power
Application Notes
Application Notes
The terminations should not be bent closer than 1.6mm from
The terminations should not be bent closer than 1.6mm from
Application Notes
The terminations recommended minimum than radius from
the body, and theshould not be bent closer bend 1.6mmis
Derating Curve
Derating Curve
Derating Curve
Derating Curve
Packaging
Packaging
Packaging
RB61 the standard method of packaging is
For RB59 and RB61 the standard method of packaging is
For RB59 and
For RB59 Ammo Packed.
Packaging
taped andand RB61 the standard method of packaging is
taped and Ammo Packed.
Ambient temperature
°C
°C
Ambient temperature
°C
70
200
Ambient temperature
°C
taped and the standard standard method of packaging is
Ammo Packed.
For RB57, and RB61 the method of packaging is taped and
For RB59 the standard method of packaging is taped and
RB57,
For RB57, Ammo Packed.
taped
reeled.and the standard method of packaging is taped and
reeled.
reeled.
For RB57, the standard method of packaging is taped and
Alternative packaging available by request.
reeled.
Alternative packaging available by request.
Alternative packaging available by request.
Alternative packaging available by request.
6
6
6
6
General Note
General Note
f
1
– f
2
≤
1.4 mm
BI Technologies
© Welwyn Components
make changes in product
Northumberland NE22 7AA,
liability.
TT Electronics reserves the right to make changes in product specification without notice or liability.
©
Electronics reserves the right to
Limited
Bedlington, Northumberland NE22 7AA, UK
TT
Welwyn Components Limited
Bedlington,
specification without notice or
UK
Telephone: +44
subject to
822181 · Facsimile:Bedlington, Northumberland NE22 7AA, UK
©
information is
(0) 1670 822181 · Facsimile:
data and
1670 829465 · Email:
at time of going to print.
Website: www.welwyn-tt.com
Telephone: +44 (0) 1670
TT Electronics’ own
+44 (0)
is considered accurate
info@welwyn-tt.com ·
All information is
Components Limited
data and
1670 829465
accurate
at time of going to print.
Website: www.welwyn-tt.com
All
Welwyn
subject to TT Electronics’ own
+44 (0)
is considered
· Email: info@welwyn-tt.com ·
88
88
88
88
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© 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
© TT Electronics plc
L
L
f
1
f
1
– f
2
L 1.4 mm
2
f
≤
f
1
– f
2
≤
1.4 mm
≤
f
1
– f
2
L 1.4 mm
6
6
6
6
IRC Welwyn
03. 08
03. 08
03. 08
06.18
07.14
www.ttelectronics.com/resistors
03. 08
www.ttelectronicsresistors.com
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