TT electronics 1601, 1905, 1600, 1602, 1906 Technical data

Tubular Vitreous Enamelled
Wirewound Resistors

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 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.

© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK

Telephone: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com

121

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

Issue E · 10.05

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.

Special requirements, for types or styles not described
in this brochure, will be considered for economic
quantities.

*The stated dissipation applies to resistors mounted horizontally with unobstructed bore.

Performance Data

*Dissipation (watts) to Resistance range (ohms) Limiting Low inductance

produce operating element winding resistance

hotspot temperature (°C) of: voltage range (ohms)

Ambient = 20°C Ambient Minimum Termination Min. res. at

= 70°C resistance at style

Type

Max. at Max. at

any either

200 300 375 375 ±5% ±2% ±1% tolerance C

All others

±10% ±5%

tolerance

1601 5 10 14 11 1 15 25 15k 250 150 10 50 1.3k

1905 7 14.5 20 16 1 15 30 30k - 450 10 50 3.5k

1600 7.5 15 21 16.5 1 15 30 56k - 600 10 50 5.0k

1602 8 15.5 22 17 1 20 25 43k 500 350 10 50 4.0k

1906 9.5 19 28 22 1 20 30 50k 700 550 10 50 5.5k

1603 11 22 32 25 1 20 30 83k 850 750 10 50 7.5k

1604 15.5 31 45 35 1 20 60 100k 1300 1000 15 50 11.5k

1605 21 41 59 47 1 30 40 100k 1100 900 15 50 14k

1908 24 47 68 54 1 30 40 100k 1200 1000 10 50 16k

1607 34 66 95 76 1 30 50 100k 1300 900 15 50 22k

1606 41 80 115 91 1 30 40 160k 2100 1900 15 50 32k

1608 52 101 145 115 1 30 50 180k 2100 1800 20 50 38k

1609 74 145 208 165 1 35 50 250k 3000 2500 30 100 58k

Tubular Vitreous Enamelled
Wirewound Resistors

1600/1900 Series

© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK

Telephone: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com

122

Issue E · 10.05

Welwyn Components

Max Typ

Load : 1000 hours at 70°C ∆R% 5.0 3.5

Shelf life : 12 months at room temperature ∆R% 1.0 0.1

Climatic ∆R% 0.5 0.35

Long term damp heat ∆R% 0.2 0.05

Bump and vibration ∆R% 0.1 0.02

Noise (in a decade of frequency) ∆R% zero zero

Pulse Handling Data Available by request

Electrical Data

(continued)

Table 1

Tubular Vitreous Enamelled
Wirewound Resistors

1600/1900 Series

© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK

Telephone: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com

123

Issue E · 10.05

Welwyn Components

ABCDEFGHJK

Type max max max nom max max nom ±.25 max

1601 33.0 17.5 8.2 4.5 5.0 19.5 15 3.0 M3 59

1905 56.1 14.5 6.55 4.5 5.0 17.5 10 3.0 M3 -

1600 61.5 14.5 6.55 4.5 5.0 17.5 10 3.0 M3 -

1602 51.0 17.5 8.2 4.5 5.0 19.5 15 3.0 M3 77

1906 64.3 17.5 8.2 4.5 5.0 19.5 15 3.0 M3 90

1603 74.5 17.5 8.2 4.5 5.0 19.5 15 3.0 M3 101

1604 102 17.5 8.2 4.5 5.0 19.5 15 3.0 M3 128

1605 89.5 24.0 13.2 5.7 6.8 26.5 17 4.0 M4 122

1908 102 24.0 13.2 5.7 6.8 26.5 17 4.0 M4 134

1607 102 32.0 19.2 7.0 9.8 32.0 22 6.4 M6 134

1606 166 24.0 13.2 5.7 6.8 26.5 17 4.0 M4 198

1608 152 32.0 19.2 7.0 9.8 32.0 22 6.4 M6 184

1609 216 32.0 19.2 7.0 9.8 32.0 22 6.4 M6 248

Terminations

Styles B, 4B, AP and AW are available in all 13 tube sizes.

Styles C, CB and CP are available in sizes 1601 to 1609
inclusive, 1906 and 1908

Lugs (Figure 2): Pb free solder coated nickel iron. Denoted
by prefix B to size reference, thus B1602

Pigtails (Figure 3): 14/.193 mm copper, 150 mm minimum
length. Denoted by prefix AP, thus AP1602

Rigid wires (Figure 4): 1.2 mm diameter tinned copper, 32
mm minimum length.

Denoted by prefix AW, thus: AW1602

Lugs with screws, nuts and washers (Figure 5): Nickel
plated brass screws and nuts. Denoted by prefix 4B,
thus: 4B1602.

Ferrule, electrically isolated (Figure 6) Connection to
resistor via Pb free solder coated nickle iron lugs. Denoted
by prefix CB, thus: CB1602.

Ferrule, electrically live (Figure 7) Nickel plated brass.
Denoted by prefix C, thus: C1602.

Ferrule, electrically isolated (Figure 8): Connection to
resistor via pigtails of 14/.193 mm copper, 150mm
minimum length. Denoted by prefix CP thus: CP1602

Marking The resistors are legend marked with type
reference, resistance value, tolerance and manufacturing
date code. Value marking conforms to IEC 62.

Solvent resistance: The vitreous coating and marking are
resistant to all accepted industrial cleaning fluids.

Physical Data

Table 2 Dimensions in millimetres. See fig 2-8 for styles