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Welwyn Electronics Park Bedlington, Northumberland
Cramlington, England-NE227AA, United Kingdom+(44)-1670-822181
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Tubular Vitreous Enamelled Wirewound Resistors

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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 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, relates to current manufacture and is considered accurate at time of going to print.
1601 1905 1600 1602 1906 1603 1604
Power rating at 70°C watts 11 16 16.5 17 22 25 35
Resistance range ohms See Table 1
Limiting element voltage volts See Table 1
TCR (-55 to +200°C) ppm/°C Typically: <+75 Maximum + 200
Resistance tolerance % 1, 2, 5, 10 See table 1 for value restrictions
Values E24 preferred
Thermal impedance °C/watt See fig. 1
Operating temperature range °C -55 to +375
1605 1908 1607 1606 1608 1609
Power rating at 70°C watts 47 54 76 91 115 165
Resistance range ohms See Table 1
Limiting element voltage volts See Table 1
TCR (-55 to +200°C) ppm/°C Typically: <+75 Maximum + 150
Resistance tolerance % 1, 2, 5, 10 See table 1 for value restrictions
Values E24 preferred
Thermal impedance °C/watt See fig. 1
Operating temperature range °C -55 to +375
Electrical Data
09.09
A subsidiary of
TT electronics plc
Welwyn Components
Note See Figure 1 for curves of temperature rise / watts dissipation.
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.
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.
The stability and high reliability of Welwyn tubular vitreous
resistors is a direct result of the best quality materials being
used in their construction.
High purity ceramic tubes have been matched with nickel
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.
Ferrules and the F type mounting plug are anchored into the
tubes with high temperature adhesive.

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