WRM0204C-1K0DI

Mini Melf Resistors WRM Series Welwyn Components • High reliability • Predictable pulse handling capability • Tolerances down to 0.1% • TCR down to 5 ppm/°C Electrical Data WRM 0102 Power rating at 70°C Resistance range Limiting element voltage TCR Resistance tolerance Standard values Thermal impedance Ambient temperature range Insulation resistance k/W °C ohms 250 watts ohms volts ppm/°C % 0.2 R22 – 2M21 150 15, 25, 50 WRM 0204 0.25 R22 – 10M 200 5, 15, 25, 50 0.1, 0.25, 0.5, 1.0, 2, 5 E24 & E96 200 -55 to +125 >1010 140 WRM 0207 0.4 R22 – 8M2 250 25, 50 Physical Data Dimensions (mm) and weight (g) Type WRM 0102 WRM 0204 WRM 0207 L max 2.2 3.6 6.0 D max 1.1 1.4 2.2 D1 max 1.1 1.4 2.2 K min 0.35 0.5 1.1 Weight 0.01 0.02 0.08 L D1 L1 K D Construction A metal film is deposited onto a high dissipation ceramic former to which tin plated teminating caps are fitted. The resistor is adjusted to value by a helical cut in the film and the body is protected by a lacquer coating. Terminations Material Plated steel cap. Solderability The pure tin finish produces ageing free contacts on which low melting solders can be used. Dipped area shall be covered with a smooth and bright solder coating after 3 seconds immersion at 215°C. Marking Resistance values are colour coded with 4 or 5 bands depending on type. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuit boards. 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 and is considered accurate at time of going to print. A subsidiary of TT electronics plc Issue D · 09.06 © 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 Mini Melf Resistors WRM Series Welwyn Components TCR and Tolerance Range Type Reference 5% WRM0102 WRM0102 WRM0102 WRM0102 WRM0102 WRM0204 WRM0204 WRM0204 WRM0204 WRM0204 WRM0207 WRM0207 WRM0207 WRM0207 WRM0207 ±50ppm ±25ppm ±15ppm ±10ppm ±05ppm ±50ppm ±25ppm ±15ppm ±10ppm ±05ppm ±50ppm ±25ppm ±15ppm ±10ppm ±05ppm R22 – R91 – – – – R22 – R91 – – – – R22 – R91 – – – – 2% IRO – 9R1 – – – – – – – – – – – – – – 1.0% 10R – 2.21M 10R – 221K – – – 1R – 10M 10R – 475K – – – 1R – 8.2M – – – – 0.5% 47RS – 221K 47R5 – 221K 100R – 100K – – 10R – 475K 10R – 475K 10R – 221K – – 10R – 1M 10R – 1M – – – 0.25% 100R – 221K 100R – 221K 100R – 100K – – 22R – 332K 22R – 332K 22R – 221K 22R – 221K 100R – 100K – – – – – 0.1% – 100R – 100K 100R – 100K – – 43R – 332K 43R – 332K 43R – 221K 43R – 221K 100R – 100K – – – – – TCR Tolerance * TC 10ppm & 5ppm is specified over the temperature range -10°C to +85°C. Performance Data Test Description 0.25 75 Ω –