Resistors MELF Resistors WRM Series AEC-Q200 High reliability Predictable pulse handling capability Tolerances down to 0.1% TCR down to 5 ppm/C All parts are Pb-free and comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3) Electrical Data Power rating @70C Resistance Range Limiting element voltage TCR Resistance tolerance Standard values Thermal impedance Ambient temperature range Insulation resistance Zero ohm jumper current rating Zero ohm jumper maximum residual resistance watts ohms volts ppm/C % WRM 0102 0.2 1R0 - 1M0 200 15, 25, 50, 100 k/W C ohms amps m 250 -55 to +155 2 WRM 0204 WRM 0207 0.25 0.4 R22 -5M1 R22 - 4M7 200 250 5, 10, 15, 25, 50, 100 15, 25, 50, 100 0.1, 0.25, 0.5, 1, 5 E24 & E96 200 140 -55 to +125 >1010 4 15 Physical Data Dimensions (mm) & weight (g) L Type L max D max D1 max K min L1 min Weight WRM 0102 2.3 1.35 1.3 0.3 1.1 0.01 WRM 0204 3.7 1.55 1.55 0.5 1.5 0.02 WRM 0207 6.1 2.4 2.4 0.5 2.9 0.08 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. Marking Resistance values are colour coded with four bands, three indicating value and one indicating the multiplier. (Note this describes standard marking, but certain values may still be supplied with the addition of a tolerance band following the multiplier.). Terminations Material Solderability D D1 L1 K Plated steel cap. 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. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuit boards. General Note 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. BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc 07.20 MELF Resistors WRM Series TCR and Tolerance Range Type Reference TCR 5% 1.0% 100ppm 1R0 - 1M0 1R0 - 1M0 50ppm 1R0 - 1M0 1R0 - 1M0 WRM0102 25ppm 49R9 - 390K 15ppm 100R - 56K 100ppm R22 - R91 50ppm 1R - 5M1 25ppm 4R7 - 500K WRM0204 15ppm 10ppm 05ppm 100ppm R22 - R91 50ppm 1R - 4M7 WRM0207 25ppm 10R - 1M 15ppm * TC 10ppm & 5ppm is specified over the temperature range -10C to +85C. Tolerance 0.5% 8R2 - 1M0 49R9 - 200K 100R - 56K 10R - 1M6 10R - 500K 10R - 221K 10R -1M6 10R - 680K 51R1 - 10K 0.25% 100R - 82K 100R - 56K 22R - 332K 22R - 402K 22R - 221K 22R - 221K 100R - 100K 51R1 - 330K 51R1 - 10K 0.1% 100R - 82K 100R - 56K 43R - 332K 43R - 332K 43R - 221K 43R - 221K 100R - 100K 100R - 100K 100R - 10K Performance Data R/R Test 75R - 100K 0204 and 0207 10R - <75R & >100K - 332K 0102 <10R & >332K All values Short time overload* 0.05% + 0.01 0.1% + 0.01 0.25% + 0.05 0.25% + 0.05 Bending test* Resistance to soldering heat Temperature rapid change 0.05% + 0.01 0.05% + 0.01 0.05% + 0.01 0.1% + 0.01 0.1% + 0.01 0.1% + 0.01 0.25% + 0.05 0.25% + 0.05 0.25% + 0.05 0.25% + 0.05 0.25% + 0.05 0.25% + 0.05 0.3% + 0.05 0.15% + 0.05 0.3% + 0.05 0.6% + 0.05 0.9% + 0.05 1.8% + 0.05 Climatic sequence* 0.5% + 0.05 1.0% + 0.05 Damp heat steady state* 0.5% + 0.05 1.0% + 0.05 Current noise <0.25V/V <3V/V Solderability >95% coverage Voltage coefficient 0 to -0.5ppm/V Voltage proof No flashover or breakdown * Resistors to be mounted on a PC-board according to IEC 115-1, clause 4.27.1. * AEC-Q200 approval applies to all values up to and including 3M4 at TCRs above 5ppm/C and to zero ohm jumpers. 0.5% + 0.05 1.0% + 0.05 3.0% + 0.05 1.0% + 0.05 1.0% + 0.05 <3V/V Endurance* Load life 1000h 8000h 225,000h 0.15% + 0.05 0.3% + 0.05 0.9% + 0.05 0.25% + 0.05 0.25% + 0.05 <0.05V/V General Note 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. BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc 07.20 MELF Resistors WRM Series Single Pulse Maximum Pulse Load WRM 0102 WRM 0204 WRM 0207 100 Pulse Load P max W 10 1 0,1 10 s 100 s 1 ms 10 ms Pulse Duration Continuous Pulses 100 ms 1s 10 s ti WRM 0102 WRM 0204 WRM 0207 100 W Continuous Pulse Load P max Maximum Pulse Load 10 1 0,1 10 s 100 s 1 ms 10 ms Pulse Duration 100 ms 1s 10 s ti 1.2/50s Lightning Surge Peak Voltage (V) 10,000 WRM0204 WRM0207 1,000 100 10 10 100 1,000 10,000 100,000 1,000,000 Resistance Value () 10/700s Lightning Surge Peak Voltage (V) 10,000 1,000 WRM0204 WRM0207 100 10 10 100 1,000 10,000 100,000 1,000,000 Resistance Value () General Note 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. BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc 07.20 MELF Resistors WRM Series 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: WRM0204C-1K0FI (WRM0204, 50ppm/C, 1 kilohm 1%, Pb-free) Example: WRM0204-R000I (WRM0204, zero ohm jumper, Pb-free) W R M 0 2 0 4 C 1 - 2 1 K 0 3 F I 4 5 1 2 3 4 5 Type TCR Value Tolerance Packing WRM0102 V = 5ppm/ C WRM0204 T = 10ppm/ C WRM0207 Y = 15ppm/ C D = 25ppm/ C C = 50ppm/ C Z = 100ppm/ C Omit for Jumper B = 0.1% C = 0.25% D = 0.5% F = 1% R000 = Jumper J = 5% Omit for Jumper 3/4 characters R = ohms K = kilohms M = megohms 0102 0204 0207 I = Standard 3000 / 7" reel 3000 / 7" reel1 1500 / 7" reel Note 1: High precision parts may be supplied on 1000 piece reels - please enquire General Note 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. BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc 07.20