W23

Vitreous Enamelled Wirewound Resistors W20 SERIES ● All welded construction ● High purity ceramic substrate ● Impervious lead free vitreous enamel coating ● High power dissipation for size ● High stability and reliability ● Suitable for harsh environments ● Overload characteristics ideal for protection circuits Electrical Data Commercial Power rating at 25°C Resistance range at 1% tolerance 2% tolerance 5% tolerance watts ohms ohms ohms pp/°C Style watts watts ohms ohms ohms ppm/°C W21 3.0 1 to 10k 0.5 to 10k 0.1 to 10k W215 5.0 1 to 15k 0.5 to 15k 0.1 to 15k Typically: .1G ohm >.1G ohm 500 min 500 min available by request APPLICATION NOTES The termination should not be bent closer than 1.6mm from the body, and the recommended minimum bend radius is 1.2mm. The terminations are solderable to within 4mm from the body. 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. Care must be taken when determining clearance distance between PACKAGING For W21 and W215 the standard method of packaging is taped in Ammo Packs. For W22 the standard method of packaging is taped and reeled. Alternatives available by special request are detailed in the table below. W23’s and W24’s are available only as loose packed in boxes. W series resistors can bbe supplied preformed. Contact factory for details. STANDARD QUANTITIES PER PACKAGE Type Ammo Pack Reel Small Box W21 W215 W22 1000 750 500 1000 750 700 N/A N/A N/A W23 N/A N/A 50 W24 N/A N/A 25 116 Derating Curve % of Rated Power 100 54 0 25 70 200 315 Ambient temperature °C the resistor body and the printed circuit board or other components to ensure these are not over heated. Resistance is measured 6mm from body. 10 ± 0.5 f1 6 f2 A f1 – f2 ≤ 1.4 mm A 63±2 73±2 73±2 6 Type W21 W215 W22 © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, England Tel: 01670 822181 Fax: 01670 829465 Web: http://www.Welwyn-TT.co.uk Issue A 07/99