RVeitsrisetoruss Enamelled
VWitirreeowuos uEnnadmRelelesdistors Welwyn Components
Wirewound Resistors
W20 Series
W• 2C0 ESeCrCiesapproved
• CSEuCitCaabpleprfooverdharsh environments
• SImuiptaebrlveifoour shalersahdefnrveireonvmiterenotsus enamel coating
• IOmvpeerrlvoioauds clehaadrafrceteevriistrteicosusideenaalmel coating
Ofovrerploroadtecchtairoanctceirricstuicitssideal for protection circuits
• HHiigghhstsatbaiblitiylitayndanredliarbeilliatybility
• HHiigghhppowoweredrisdsiipsastiipoantfiornsifzoer size
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
Commercial W21 W215 W22 W23 W24
Power rating at 25°C watts 3.0 5.0 7.0 10.5 14.0
Resistance range at 1% tolerance ohms 1R to 10K 1R to 15K 1R to 22K 1R to 60K 1R to 100K
2% tolerance ohms 0R5 to 10K 0R5 to 15K 0R5 to 22K 1R to 60K 1R to 100K
5% tolerance ohms 0R1 to 10K 0R1 to 15K 0R1 to 22K 0R15 to 60K 0R2 to 100K
TCR (-55° to 200°C) ppm/°C Typically: <+-75 Maximum: +-200
BS CECC 40-201-002 Requirements Style JB HB KB LB MB
Power rating at 25°C watts 2.9 5.0 7.0 10.5 14.0
Power rating at 70°C watts 2.5 4.3 6.0 9.0 12.0
Resistance range at 1% tolerance ohms 1R to 10K 1R to 15K 1R to 20K 1R to 56K 1R to 100K
2% tolerance ohms 0R5 to 10K 0R5 to 15K 0R5 to 20K 1R to 56K 1R to 100K
5% tolerance ohms 0R1 to 10K 0R1 to 15K 0R1 to 20K 0R15 to 56K 0R2 to 100K
TCR (-55° to 200°C) ppm/°C ≥5 ohms < 10 ohms: ±400 ≥10 ohms: ±200
This table indicates the CECC specification requirements, and these are met or exceeded by the corresponding W20 series products
Applicable to commercial and approved ranges
Limiting element voltage volts 100 160 200 500 750
Standard values E24 preferred. Other values to special order
Thermal impedance °C/watt 88 58 44 29 22
Ambient temperature range °C -55 to 200
Physical Data
Dimensions (mm) and Weight (g)
Type L max D max f min d nom Wt.nom
W21 12.7 5.6 22.75 0.8 1
W215 22.0 7.0 23.1 0.8 2 d
W22 22.0 8.0 23.1 0.8 2 D
W23 38.0 8.0 - 0.8 3.5 L f
W24 53.5 8.0 - 0.8 5
400 Construction
Temperature Rise °C W21 W215 W23 W24 A high purity ceramic substrate is assembled with interference fit end caps to which are
300 W22 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.
200 Terminations
Material Copper clad steel wire, nickel plated and solder-coated.
Strength The terminations meet the requirements of IEC 68.2.21.
100 Solderability The terminations meet the requirements of IEC 115-1,– Clause 4.17.3.2.
Length W23’s and W24’s are not supplied on tape. Minimum lead length is 30 mm.
0 Marking
0 5 10 15 20 The resistors are legend marked with type reference, resistance value and tolerance. Values are
Dissipation – Watts marked in accordance with IEC 62.
GGeenneeraral lNNotoete BI Technologies IRC Welwyn
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© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
©TelTepThEolneec:t+ro4n4ic(0s)p1l6c70 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
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WW20irSeewrieos und Resistors
W20 Series Welwyn Components
Solvent Resistance
The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits
Solvent Resistance Flammability
FTlhaembmodaybiplirtoytection and marking are resistant to all normal All materials used in the construction of ‘W’ series resistors
AinlldmuastterriaiallsculesaendiinngthseoclovnesnttrsucstuiointaobflWe 2fo0rseprrieinstreedsisctoirrcsuairtes.inorganic andainrheeirneontrlgyannoinc-baunrndining.herently non burning.
Performance Data
CECC 40201-002 Actual Performance
Requirements Maximum Typical
Load at commercial rating: 1000 hrs at 25°C R% 5 3.5
Load at CECC rating: 1000 hours at 25°C R% 5 5 3.5
Dry heat: 1000 hours at 200°C R% 5 2 1
Shelf life: 12 months at room temperature R% not specified 0.03 0.02
Derating see derating curve
Short term overload R% 1 1.0 0.2
Climatic R% 5 0.5 0.2
Climatic category R% 55/200/56
Long term damp heat R% 5 0.05 0.02
Temperature rapid change R% 1 0.5 0.2
Resistance to solder heat R% 1 0.25 0.03
Vibration and bump R% 1 0.25 0.05
Noise (in decade of frequency) µv/v not specified zero zero
Robustness R% 1 0.4 0.05
Insulation resistance ohms not specified > 1G ohm > 1G ohm
Voltage Proof volts not specified 500 min 500 min
Pulse handling data available at http://www.ttelectronics.com/themes/ttelectronics/datasheets/dreasitsatoras/vliateirlaatburlee/Pbulyser-eOqveurleoasdt_AN.pdf
Application Notes Packaging
The termination should not be bent closer than 1.6mm from For W21 and W215 the standard method of packaging is
the body, and the recommended minimum bend radius is taped in Ammo Packs. For W22 the standard method of
1.2mm. The terminations are solderable to within 4mm from packaging is taped and reeled. W23’s and W24’s are
the body. When cold, vitreous enamel has excellent insulation available only as loose packed in boxes.
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. Care must be taken 10
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 body. f1 f2
6 b 6
116 Derating Curve f1 – f2 1.4 mm
% of Rated Power 100
54
Type b
W21 63±2
0 W215 73±2
25 70 200 315 W22 73±2
Ambient temperature °C
General Note BI Technologies IRC Welwyn
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. http://www.ttelectronics.com/resistors
© TT Electronics plc
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK 11.16
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Vitreous Enamelled
WVitirreeowuos EunnadmeRlleedsistors
Wirewound Resistors
W20 Series Welwyn Components
W20 Series
Ordering Procedure
Ordering Procedure
This product has two valid part numbers:
Example: W22 at 3.3 kilohms and 5% tolerance on a reel of 700 pieces –
Example: W22-3K3JI (W22, 3.3 kilohms ±5%, Pb-free)
W 2 2 - 3 K 3 J I W22–3K3JI
Type 1 2 3 4
Value (u1se IEC62 c2ode) 3 4
Type Value Tolerance Packing & Termination Finish
ToleranWc2e1 (uEs2e4 =IE3/C4 c6h2araccotedrse) F = ±1% I = Standard packing & Pb-free
F 1%W215 J 5R%= ohms G = ±2% PB = Standard packing & SnPb
G 2%WW2223 K = kilohms J = ±5% W21, W215 1000/box
W22 700/reel
W24 W23, W24 50/box
Packing
For CECC releAasmedmprooduct sWtat2e1on, Word2er1th5e CECC n1u0m0b0er/banodxstyle. Example: W22-3K3JI CECC40201-002 KB
I Tape W22 700/reel Standard
Bulk W23, W24 50/box
UFSoAr C(IRECC) Praerlet aNsuemd bperor:duWc2t 2st-a3t3e0o1nJLoFrd(eWr 2th2e, 3C.3ECkiClohnmums b±e5r%a,nPdbs-ftryelee.) Example: W22-3K3JI CECC40201-002 KB
For SnPb finish instead of Pb-free replace the packing suffix with PB. Example: W22-3K3JPB
W 2 2 - 3 3 0 1 J L F
1 2 3 4
1 2 3 4
Type Value Tolerance Packing & Termination Finish
W21 3 digits + multiplier F = ±1% LF = Standard packing & Pb- free
W215 R = ohms for values <100 ohms G = ±2% Omit for Standard packing & SnPb
W22 J = ±5% W21, W215 1000/box
W23 W22 700/reel
W24 W23, W24 50/box
General Note BI Technologies IRC Welwyn
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http://www.ttelectronics.com/0r7es.1is1tors
86 © TT Electronics plc
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W2151002JA W21150R0FTR W22150R0FTR W2275R0FTR W22-27R0JLF W2110R0JLFTR W21-R10JI W215-
R500-JALF W21R100JLFTR W24-5K-JI W225R60JR W236R80JB W2120R0JA W212700JA W2155010JA
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W214R70JA W23R470JB W2152701JA W232202JB W231500JB W2156801JA W22R330JR W232201JB
W246R80JB W215R60JA W216R80JA W234701JB W234700JB W2155601JA W2115R0JA W243301JB
W2310R0JB W221801JR W243300JB W23R680JB W2155001JA W221R80JR W226801JR W21R270JA
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W2153301JA W21R150JA W2155R60JA W228R20JR W22R560JR W22R680JR W246802JB W215R120JA
W231000JB W21R180JA W211500JA W215R390JA W244701JB W244R70JB W242201JB W215R100JA
W223301JR W2215R0JR W2182R0JA W221R50JR W2151R80JA W2227R0JR W2151202JA W21100RJA
W215R680JA W2139R0JA W215R220JA W2158200JA W2122R0JA W244700JB W211801JA W2112R0JA
W2158R20JA W227500JR W21R120JA W21518R0JA W2152201JA
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