Vitreous Enamelled
Vitreous Enamelled
Wirewound Resistors
Wirewound Resistors
V700 (RB Style) Series
V700 (RB Style) Series
Stability for harsh environments
Stability for harsh environments
Overload characteristics ideal for protection circuits
Overload characteristics ideal for
High stability and reliability
protection circuits
High power dissipation for size
High stability and reliability
Impervious lead free vitreous enamel coating
High power dissipation for size
Welwyn Components
·
·
·
·
·
Impervious lead free vitreous enamel coating
Electrical Data
V757
(RB57)
Power rating at 25°C
Resistance range
Limiting element voltage
TCR
Resistance tolerance
Standard values
Thermal impedance
Ambient temperature range
°C/watt
°C
44
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
32
88
-55 to 200
36
58
E24 preferred. Other values to special order
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 the right to right changes in product product specification without liability.
TT electronics reserves reserves the make to make changes in specification without notice or 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.
© 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
A subsidiary of
TT electronics plc
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
03. 08
09. 11
87
Vitreous Enamelled
Vitreous Enamelled
Wirewound Resistors
Vitreous Enamelled
Vitreous Enamelled
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
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
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
315
200
315
200
temperature
315
°C
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 and the recommended minimum bend radius is
the body, resistors are to dissipate full rated power, the
terminations should not be soldered closer than 4mm from
terminations should not be soldered closer than 4mm from
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 with any as insulated and should not be used in
cannot be classedconducting material.
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
between the resistor body and the printed circuit board or
body and the printed circuit board or
between the taken body and the are clearance distance
printed circuit board
Care components to ensure these are not over heated.
othermust beresistorwhen determining not over heated. or
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 Power
% of % of Rated Power
%RatedRated 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
°C
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
Ambient temperature
70
200
Ambient temperature
315
°C
°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.
standard
taped RB58 and RB60 method of packaging is taped and
reeled.and theand RB60 are loose packed in boxes.
reeled. RB58
are loose packed in boxes.
reeled. RB58 standard are loose packed in is taped and
For RB57, packaging available by request.
Alternativetheand RB60 method by request. boxes.
Alternative packaging available of packaging
Alternative packaging available by request.
reeled. RB58 and RB60 are loose packed in boxes.
Alternative packaging available by request.
6
6
6
6
L
L
f
1
f
1
– f
2
L 1.4 mmf
2
≤
f
1
– f
2
≤
1.4 mm
≤
f
1
– f
2
L 1.4 mm
6
6
6
6
General Note
f
1
– f
2
≤
1.4 mm
©
electronics reserves the right to make changes in product specification without notice or liability.
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
TT
Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44
Components Limited
Bedlington, Northumberland NE22 7AA, UK
© Welwyn
is subject 822181 · Facsimile: +44 (0) and is 829465 · Email: info@welwyn-tt.com toWebsite: www.welwyn-tt.com
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
All information (0) 1670 to TT electronics’ own data 1670 considered accurate at time of going · print.
88
88
88
88
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
03. 08
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
03. 08
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT electronics plc
03. 08
03. 08
09. 11
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