V700 [TTELEC]
Vitreous Enamelled Wirewound Resistors; 釉瓷线绕电阻器
| 型号： | V700 |
| 厂家： | 
TT Electronics |
| 描述： | Vitreous Enamelled Wirewound Resistors |
| 文件： | 总2页 (文件大小：141K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Vitreous Enamelled
Wirewound Resistors
Welwyn Components
V700 (RB Style) Series
• 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)
7
V758
(RB58)
11.0
V759
(RB59)
3.0
V760
(RB60)
8.0
V761
(RB61)
5.0
Power rating at 25°C
Resistance range
Limiting element voltage
TCR
watts
ohms 0R1 to 20K 0R2 to 82K 0R1 to 10K 0R1 to 56K 0R1 to 15K
volts
ppm/°C
%
200
400
100
250
160
Typically: +75
Maximum +120
Resistance tolerance
5
Closer tolerances to special order
Approved CECC 40201 - 001
Power rating at 25°C
Power rating at 70°C
Resistance range
watts
watts
6.5
5.6
3.0
2.6
8.0
6.9
5.0
4.3
ohms 0R1 to 20K
0R1 to 10K 0R1 to 56K 0R15 to 15K
Limiting element voltage
TCR
volts
ppm/°C
%
160
63
250
160
>20 ohms 500
≥20 ohms -50 +250
Resistance tolerance
Standard values
5
5
5
5
E24 preferred. Other values to special order
Thermal impedance
Ambient temperature range
°C/watt
°C
44
32
88
36
58
-55 to 200
* See temperature rise in graph Application Notes
Physical Data
Maximum Dimensions (mm) and Weight (g)
Type
L max
22.2
47
D max
8
f min
30
d max
0.88
0.88
0.88
0.88
0.88
Wt. Nom
V757 (RB57)
V758 (RB58)
V759 (RB59)
V760 (RB60)
V761 (RB61)
2
9
1
4
2
11
30
d
D
12.7
36
5.6
10.0
7.0
30
L
f
30
23
30
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
© 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
Issue B · 03.02
87
Vitreous Enamelled
Wirewound Resistors
V700 (RB Style) Series
Welwyn Components
Terminations
Strength
The terminations meet requirements of
IEC 68.2.21.
Material
Copper clad steel wire, nickel plated and
solder-coated.
Solderability The terminations meet the requirements of IEC
115-1, Clause 4.17.3.2.
Performance Data
CECC
Actual Performance
40201-001
Maximum
Typical
3.5
Load at rated power: 1000 hrs
Dry heat: 1000 hours at 200°c
Shelf life: 12 mths at room temp
Derating from rated power at 25°C
Short term overload
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
5
5
2
5
1
Not specified
0.03
0.02
Not specified
See derating curve
2
1.5
0.5
0.5
0.2
Climatic
5
Climatic category
55/200/56
55/200/56
0.05
55/200/56
0.02
Long term damp heat
Temperature rapid change
Resistance to solder heat
Vibration
5
1
0.5
0.05
1
0.25
0.03
1
0.25
0.05
Noise (µV/V in a decade of freqency)
Shock
Not specified
1
zero
∆R%
0.2
0.05
Pulse handling
Data available by request
116
100
Derating Curve
Application Notes
The terminations should not be bent closer than 1.6mm from
the body, and the recommended minimum bend radius is
1.2mm. If resistors are to dissipate full rated power, the
terminations should not be soldered closer than 4mm from
the body.
54
When cold, vitreous enamel has excellent insulation
resistance. In common with all insulants the specific resistance
of the enamel decreases with increase in temperature.
Therefore, resistors operated at near maximum temperature
cannot be classed as insulated and should not be used in
contact with any conducting material.
0
25
70
200
315
Ambient temperature °C
Packaging
For RB59 and RB61 the standard method of packaging is
taped and Ammo Packed.
Care must be taken when determining clearance distance
between the resistor body and the printed circuit board or
other components to ensure these are not over heated.
Resistance is measured 6mm from the body.
For RB57, the standard method of packaging is taped and
reeled. RB58 and RB60 are loose packed in boxes.
Alternative packaging available by request.
Standard Quantities Per Box/Spool
10
Type
V759
V757
V761
L
Type
V757
(RB57)
–
V758
V759
(RB59)
1000
–
V760
V761
(RB61)
1000
–
63
73
73
(style)
(RB58)
(RB60)
Ammo pack
Spool
–
–
–
–
700
–
f1
f2
f1 – f2 ≤ 1.4 mm
Box (Loose)
25
–
50
–
L
6
6
© 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
Issue B · 03.02
88
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