Resistors MELF Resistors WRM Series AEC-Q200 High reliability Predictable pulse handling capability Tolerances down to 0.1% TCR down to 5 ppm/°C AAllll ppaarrttss aarree PPbb--ffrreeee aanndd ccoommppllyy wwiitthh EEUU DDiirreecctitivvee 22001111//6655//EEUU aammeennddeedd bbyy ((EEUU)) 22001155//886633 ((RRooHHSS33)) Electrical Data WRM 0102 WRM 0204 WRM 0207 Power rating @70°C watts 0.2 0.25 0.4 Resistance Range ohms 8R2 - 1M0 R22 -5M1 R22 - 10M Limiting element voltage volts 200 200 250 TCR ppm/°C 15, 25, 50, 100 5, 10, 15, 25, 50, 100 15, 25, 50, 100 Resistance tolerance % 0.1, 0.25, 0.5, 1, 5 Standard values E24 & E96 Thermal impedance k/W 250 200 140 Ambient temperature range °C -55 to +155 -55 to +125 Insulation resistance ohms >1010 Zero ohm jumper current rating amps 2 4 Zero ohm jumper maximum residual resistance mΩ 15 Physical Data Dimensions (mm) & weight (g) L L D D1 K L1 Type Weight max max max min min WRM 0102 2.3 1.35 1.3 0.3 1.1 0.01 D1 D WRM 0204 3.7 1.55 1.55 0.5 1.5 0.02 L1 K WRM 0207 6.1 2.4 2.4 0.5 2.9 0.08 Construction Terminations A metal film is deposited onto a high dissipation ceramic Material Plated steel cap. former to which tin plated teminating caps are fitted. Solderability The pure tin finish produces ageing free contacts on which low melting solders can The resistor is adjusted to value by a helical cut in the film be used. Dipped area shall be covered with and the body is protected by a lacquer coating. a smooth and bright solder coating after 3 seconds immersion at 215°C. Marking Resistance values are colour coded with four bands, Solvent Resistance three indicating value and one indicating the multiplier. The body protection and marking are resistant to all normal (Note this describes standard marking, but certain values industrial cleaning solvents suitable for printed circuit boards. may still be supplied with the addition of a tolerance band following the multiplier.). 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. www.ttelectronics.com/resistors © TT Electronics plc 07.18

MELF Resistors WRM Series TCR and Tolerance Range Type Reference TCR Tolerance 5% 1.0% 0.5% 0.25% 0.1% ±100ppm 10R - 1M0 10R - 1M0 - - - ±50ppm 10R - 1M0 10R - 1M0 8R2 - 1M0 - - WRM0102 ±25ppm - 100R - 82K 100R - 100K 100R - 82K 100R - 82K ±15ppm - 100R - 56K 100R - 56K 100R - 56K 100R - 56K ±100ppm R22 - R91 - - - - ±50ppm - 1R - 5M1 10R - 1M6 22R - 332K 43R - 332K ±25ppm - 4R7 - 500K 10R - 500K 22R - 402K 43R - 332K WRM0204 ±15ppm - - 10R - 221K 22R - 221K 43R - 221K ±10ppm - - - 22R - 221K 43R - 221K ±05ppm - - - 100R - 100K 100R - 100K ±100ppm R22 - R91 - - - - ±50ppm - 1R - 10M 10R -1M6 - - WRM0207 ±25ppm - 10R - 1M 10R - 680K 51R1 - 330K 100R - 100K ±15ppm - - 51R1 - 10K 51R1 - 10K 100R - 10K * TC 10ppm & 5ppm is specified over the temperature range -10°C to +85°C. Performance Data Δ R/R 0204 and 0207 0102 Test 10R - <75R & 75R - 100K <10R & >332K All values >100K - 332K Short time overload* ≤0.05% + 0.01Ω ≤0.1% + 0.01Ω ≤0.25% + 0.05Ω ≤0.25% + 0.05Ω Bending test* ≤0.05% + 0.01Ω ≤0.1% + 0.01Ω ≤0.25% + 0.05Ω ≤0.25% + 0.05Ω Resistance to soldering heat ≤0.05% + 0.01Ω ≤0.1% + 0.01Ω ≤0.25% + 0.05Ω ≤0.25% + 0.05Ω Temperature rapid change ≤0.05% + 0.01Ω ≤0.1% + 0.01Ω ≤0.25% + 0.05Ω ≤0.25% + 0.05Ω Endurance* Load life 1000h ≤0.15% + 0.05Ω ≤0.15% + 0.05Ω ≤0.3% + 0.05Ω ≤0.5% + 0.05Ω 8000h ≤0.3% + 0.05Ω ≤0.3% + 0.05Ω ≤0.6% + 0.05Ω ≤1.0% + 0.05Ω 225,000h ≤0.9% + 0.05Ω ≤0.9% + 0.05Ω ≤1.8% + 0.05Ω ≤3.0% + 0.05Ω Climatic sequence* ≤0.25% + 0.05Ω ≤0.5% + 0.05Ω ≤1.0% + 0.05Ω ≤1.0% + 0.05Ω Damp heat steady state* ≤0.25% + 0.05Ω ≤0.5% + 0.05Ω ≤1.0% + 0.05Ω ≤1.0% + 0.05Ω Current noise <0.05µV/V <0.25µV/V <3µV/V <3µV/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. 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. www.ttelectronics.com/resistors © TT Electronics plc 07.18

MELF Resistors WRM Series Single Pulse Maximum Pulse Load WRM 0102 100 WRM 0204 WRM 0207 W max P 10 d a o L e uls P 1 0,1 10 µs 100 µs 1 ms 10 ms 100 ms 1 s 10 s Pulse Duration ti Continuous Pulses Maximum Pulse Load Pmax100 WWRRMM 00120024 WRM 0207 d W a o e L 10 uls P us o nu 1 nti o C 0,1 10 µs 100 µs 1 ms 10 ms 100 ms 1 s 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: 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 K 0 F I 1 2 3 4 5 1 2 3 4 5 Type TCR Value Tolerance Packing WRM0102 V = ±5ppm/ C 3/4 characters B = ±0.1% I = Standard WRM0204 T = ±10ppm/ C R = ohms C = ±0.25% 0102 3000 / 7” reel WRM0207 Y = ±15ppm/ C K = kilohms D = ±0.5% 0204 3000 / 7” reel1 D = ±25ppm/ C M = megohms F = ±1% 0207 1500 / 7” reel C = ±50ppm/ C R000 = Jumper J = ±5% Z = ±100ppm/ C Omit for Jumper Omit for Jumper Note 1: High precision parts may be supplied on 1000 piece reels – please enquire 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. www.ttelectronics.com/resistors © TT Electronics plc 07.18

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: T T Electronics: WRM0207C-100KFI WRM0204C-10KFI WRM0207C-10KFI WRM0204C-100KFI WRM0207C-120RFI WRM0207C- 150KFI WRM0207C-10RFI WRM0207C-1M0FI WRM0204C-4K7FI WRM0207C-470RFI WRM0204C-12KFI WRM0207C-1K0FI WRM0204C-750RFI WRM0204C-2K2FI WRM0204C-390KFI WRM0204C-100RFI WRM0204C- 1M0FI WRM0207C-100RFI WRM0204C-1K0FI WRM0207C-47RFI WRM0204C-22RFI WRM0204C-150RFI WRM0204C-1K5FI WRM0207C-4K7FI WRM0204C-470KFI WRM0204C-10RFI WRM0207C-3R0FI WRM0204C- 120RFI WRM0207C-27KFI WRM0204C-47RFI WRM0204C-5K6FI WRM0204C-470RFI WRM0204C-330KFI WRM0204C-6K8FI WRM0204C-3K3FI WRM0204C-10K0FI WRM0204C-82KFI WRM0204C-220KFI WRM0204C- 330RFI WRM0204C-3R0FI WRM0204C-68KFI WRM0204C-499KFI WRM0204Y-470RBI WRM0204C-560RFI WRM0204C-220RFI WRM0204C-39RFI WRM0207C-2K2FI WRM0204C-33KFI WRM0207C-330RFI WRM0204C- 12RFI WRM0207C-220RFI WRM0204C-18KFI WRM0204C-8K2FI