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| 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 70C 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 215C. 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 (c) 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 -10C to +85C. Performance Data Test Description 0.25 75 - <100 k Short time overload* Bending test* Resistance to soldering heat Temperature rapid change Endurance* Load life Climatic sequence* Damp heat steady state* Current noise Solderability Voltage coefficient Voltage proof 200V 1000h 8000 h 0.25% + 0.05 0.5% + 0.05 0.25% + 0.05 0.25% + 0.05 < 0.05 V/V 0.25% + 0.05 0.5% + 0.05 0.5% + 0.05 0.5% + 0.05 < 0.25 V/V Dipped area shall be covered with a smooth and bright solder coating of at least 96% < 0.5 . 106/V 300V 500V 0.5% + 0.05 1.0% + 0.05 1.0% + 0.05 1.0% + 0.05 < 3 V/V 0.05% + 0.01 0.05% + 0.01 0.05% + 0.01 0.05% + 0.01 Results 0.5 10 - <75 >100 k - 332 k 0.1% + 0.01 0.1% + 0.01 0.1% + 0.01 0.1% + 0.01 R/R 1.0 0.22 - <10 >332 k - 10 M 0.25% + 0.05 0.25% + 0.05 0.25% + 0.05 0.25% + 0.05 Stability class * Resistors to be mounted on a PC-board according to IEC 115-1, clause 4.27.1 (c) 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 Issue D * 09.06 Mini Melf Resistors WRM Series Single Pulse Maximum Pulse Load WRM 0102 WRM 0204 WRM 0207 Welwyn Components 100 Pulse Load Pmax W 10 1 0,1 10 s 100 s 1 ms 10 ms 100 ms 1s 10 s Pulse Duration ti Continuous Pulses Maximum Pulse Load Continuous Pulse Load Pmax WRM 0102 WRM 0204 WRM 0207 100 W 10 1 0,1 10 s 100 s 1 ms 10 ms 100 ms 1s 10 s Pulse Duration ti Packaging The WRM 0102 and 0204 resistors are supplied reeled on 8mm blister tape. WRM 0207 resistors are supplied on 12mm blister tape. Packaging complies with the requirements of IEC 286-3. Ordering Procedure Example: WRM0204 at 1 kilohm, 1% tolerance and 50ppm/C TCR on a reel of 3000 pieces Type Size TCR C 50ppm/C D 25ppm/C Y 15ppm/C T V 10ppm/C 5ppm/C I Tape 0102 0204 0207 3000 / reel (7") 3000 / reel (7")* 1500 / reel (7") Standard WRM 0204 C- 1K0 F I Packing * High precision parts may be supplied on 1000 piece reels - please enquire Value (use IEC62 code) Tolerance (use IEC62 code) B 0.1% D 0.5% 1% G 2% J 5% C 0.25% F (c) 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 Issue D * 09.06 |
Price & Availability of WRM0102
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