Tubular Vitreous Enamelled
Wirewound Resistors
Welwyn Components
1600/1900 Series
•
Impervious lead free vitreous enamel coating
• Can be supplied with fixed, adjustable,
tapped or low inductance winding
• Seven termination styles with choice of
mounting arrangements
• Manufactured RoHS compliant
Pb-free terminations*
* Check status of stock when ordering
General Information
Vitreous enamelled wirewound resistors are capable of
withstanding a higher dissipation size for size, than any other
protected type; this is attributable to the higher operating
temperature which the wire and enamel can withstand.
Vitreous enamel provides exceptionally good protection to the
wire element and is essentially impervious to moisture. The
resistors can safely be used in harsh environmental conditions.
chromium resistance wires and specially formulated enamel to
ensure that the resistors can withstand repeated heat cycling
without damage.
Connections between the resistance element and end
terminations are welded; other connections are brazed.
Mounting devices are available which permit resistors to be
mounted by both ends or by one end. Single ended mounting
is recommended for applications which do not subject the
resistor to shock or vibration.
The Welwyn range is based on thirteen sizes of tube, each of
which has a recommended maximum dissipation which limits
operating surface temperature to a maximum of 375°C.
Ferrules and the F type mounting plug are anchored into the
tubes with high temperature adhesive.
The stability and high reliability of Welwyn tubular vitreous
resistors is a direct result of the best quality materials being
used in their construction.
Special requirements, for types or styles not described
in this brochure, will be considered for economic
quantities.
High purity ceramic tubes have been matched with nickel
Electrical Data
1601
1905
1600
1602
17
1906
1603
1604
Power rating at 70°C
Resistance range
watts
11
16
16.5
22
25
35
ohms
volts
See Table 1
See Table 1
Limiting element voltage
TCR (-55 to +200°C)
Resistance tolerance
Values
ppm/°C
%
Typically: <+75
1, 2, 5, 10
Maximum + 200
See table 1 for value restrictions
E24 preferred
Thermal impedance
Operating temperature range
°C/watt
°C
See fig. 1
-55 to +375
1605
1908
1607
76
1606
1608
1609
Power rating at 70°C
Resistance range
watts
ohms
volts
47
54
91
115
165
See Table 1
See Table 1
Limiting element voltage
TCR (-55 to +200°C)
Resistance tolerance
Values
ppm/°C
%
Typically: <+75
1, 2, 5, 10
Maximum + 150
See table 1 for value restrictions
E24 preferred
See fig. 1
Thermal impedance
Operating temperature range
°C/watt
°C-55 to +375
Note See Figure 1 for curves of temperature rise / watts dissipation.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
A subsidiary of
All information is subject to Welwyn’s own data, relates to current manufacture and is considered accurate at time of going to print.
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 E · 10.05
121
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