Resistors Wirewound High Surge Resistors WHS Series Enhanced surge & pulse energy capacity UL94-V0 flameproof protection Radial taped form available Surface mount ZI-form option Non inductive type available All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3) Electrical Data WHS2 / WHSP2R WHS3 WHS5 WHS7 WHS10 WHS10N* Power rating at 25C watts 2 3 5 7 10 5s overload rating at 25C watts 10 15 25 35 50 Short pulse performance See Pulse Performance graphs Resistance range ohms TCR 1R0-330R 2R2-330R ppm/C Isolation Voltage 200 volts Resistance Tolerance 5R6-100R 250 350 % 500 700 1000 <20R: 5 20R: 1, 2, 5 Standard Values 5% E24 preferred Thermal Impedance C/watt Ambient temperature range 110 82 54 C 35 25 -55 to +200 No Limiting Element Voltage applies to this series; the Rated Voltage is (P.R). *Non inductive (Ayrton Perry) winding Physical Data Dimensions (mm) & Weight (g) Type D max f min WHS2 9.0 3.6 19.80 12.70 WHS3 14.5 5.2 24.55 20.30 WHS5 16.5 7.0 23.55 WHS7 25.0 8.8 28.30 WHS10 WHS10N 51.0 10.5 11.0 26.00 d max PCB mount centres L max 0.81 22.86 Min bend radius 0.50 1.2 31.40 1.01 55.88 Wt. nom 1.10 1.75 d D L f 4.40 1.5 8.80 10.50 Construction A high purity ceramic substrate is assembled with interference fit end caps to which are welded the terminations. The resistive element is wound on the substrate and welded to the caps. Flameproof silicone cement coating is applied prior to marking with indelible ink. The components are then leadformed if required and packed. 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 03.20 Wirewound High Surge Resistors WHS Series Terminations Material: Hot tin dipped copper wire Strength: The terminations meet the requirements of IEC 68.2.21 Solderability: The terminations meet the requirements of IEC 115-1 Clause 4.17.3.2 Marking WHS2, WHSP2R and WHS3 resistors are marked with four colour bands in conformance with IEC62. The larger sizes are legend marked with type reference, resistance value and tolerance. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. Flammability The resistor coating will not burn or emit incandescent particles under any condition of applied temperature or power overload. Performance Data Maximum Typical Load at rated power: 1000hrs @ 25C R% 5 +0.001 3 Dry heat: 1000hrs @ 200C R% 5 +0.001 3 Short term overload R% 5 +0.001 1 R% 5 +0.001 TRC & Vibration R% 5 +0.001 1 Robustness & solder heat R% 5 +0.001 1 Long term damp heat (56 days) R% 5 +0.001 1 Derating from rated power @25C Zero at 280C (See Thermal Performance graph). Climatic Climatic category 2 55/200/56 Pulse Performance Surge / Pulse Energy Capacity (single or low repetition rate, R < 5%) Energy (joules) 1000 WHS10N 100 WHS10 WHS7 WHS5 10 1 WHS3 WHS2 / WHSP2R 1 10 100 1000 Value (ohms) 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 03.20 Wirewound High Surge Resistors WHS Series WHS10 WHS7 WHS5 WHS3 WHS10N WHS2 / WHSP2R Thermal Performance WHS10(N) WHS2-7 Body Temperature Rise Temperature Rise (C) Proportion of Rated Power (%) Derating Curve Ambient Temperature C WHS2 / WHS3 WHSP2R WHS5 WHS7 WHS10(N) Power (W) Application Notes 1. If the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than 4mm from the body. 2. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. The surface temperature rise at the centre of the body is shown under Thermal Performance. 3. WHS2, WHS3, WHS5 resistors can also be supplied with goalpost or lancet pre-formed leads. Hairpin form is available on WHS2 and WHS3 only. For details see https://www.ttelectronics.com/TTElectronics/media/ProductFiles/Resistors/ApplicationNotes/TN008-resistors-Leadform-Capability.pdf. WHS2, WHS3, and WHS5 are also available in an SMD format with ZI formed leads and packed in blister tape. For details see https://www.ttelectronics.com/TTElectronics/media/ProductFiles/Resistors/Datasheets/ZI-form.pdf 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 03.20 Wirewound High Surge Resistors WHS Series Hairpin Goalpost Lancet ZI-form Also a 2W and 3W radial taped version is available as shown below Radial Taped Dimensions (mm) Dimension Notation WHSP2R* WHS3R Component body length L 10.0 Max 14.5 Max Component body diameter D 4.0 Max 5.8 Max Terminal lead diameter d 0.8 Nom Component pitch P 12.70.5 12.71.0 Hole pitch Po 12.70.2 12.70.3 P1 3.850.3 3.850.7 P2 5.850.5 6.351.3 F 5.0 +0.75 -0.34 5.01.0 Component to hole offset Lead pitch Width of backing strip W 18.00.3 18.01.0 Position of hole W1 9.00.25 9.00.5 Diameter of hole Do 4.00.3 Height to lead form Ho 16.00.3 17.01.0 Height from lead form Ho1 17.0 Max 23.0 Max Height to resistor Ho2 18.0 Min Width of adhesive tape W0 15.00.5 Length of protrusion Form dimensions l <2.5 K1 2.00.3 K2 3.00.5 K3 1.50.25 K4 K5 1.00.2 -- 2.0 Min * Although body dimensions differ slightly, WHSP2R Performance and Electrical Data are identical to those of WHS2 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 03.20 Wirewound High Surge Resistors WHS Series Changes to Packaging Remove text from table and replace image: Packaging Dimensions mm a b WHSc is taped. The critical dimensions are shown below. The component wires will not protrude beyond The standard packaging for WHS2 6 52 5 the outside edge of the tapes. Taped product is then packed into boxes or onto reels. See Ordering Procedure for details. Alternative packaging request. WHS3 is available 6 by67 10 Pre-formed resistors are supplied loose packed in plastic bags or boxes. WHS5 6 Dimensions mm 6 *WHS7 WHS10 9 WHS2 WHS10N 9 63 85 a 105 6 105 10 10 10 20 *An offset lead length is available for WHS7 series. WHS3 6 Consult factory for details b c 52 5 67 10 WHS5 6 63 10 WHS7 6 85 10 9 105 10 105 20 b c 95 10 Add new tableWHS10 below: WHS10N Dimensions mm WHS7U Dimensions mm 9 a b 6 95 WHS7U c 10 a 6 ULW ADDITIONAL Example: ULWP2R-33RJT15 (ULWP2R radially formed & taped, 33 ohms 5%, Pb-free) Ordering Procedure U L W P 2 R 3 Ordering Procedure 3 R J T Example: WHS2-100RJA25 (WHS2, ohms 5%, Pb-free) 1 2 100100 3 5%, 4 Example: WHS2-100RJA25 (WHS2, ohms Pb-free) W H 1 Type S 1 2 2 - 1 0 2 3 0 R J 3 Leadforming A 4 4 Value ULWP2 R = Radial taped 3/4 characters 1 2 3 4 R = ohms 5 5 2 5 5 5 Tolerance Packing J = 5% T15 Tape & reel, 1500/reel Type Variant Value Tolerance WHS2 WHS3 WHS5 WHS7 WHS10 U = unequal lead length (WHS7 only) 3/4 characters R = ohms F = 1% G = 2% J = 5% WHS ADDITIONAL 1 5 Packing A25 A1 T075 T07 A02 A01 N = noninductive (WHS10 only) WHS2 WHS3 WHS5 WHS7(U) WHS10 WHS10N Ammo pack, 2500/box Ammo pack, 1000/box Tape & reel, 750/reel Tape & reel, 700/reel Ammo pack, 200/box Ammo pack, 100/box Example: WHSP2R-100RJT15 (WHSP2R radially formed & 100 taped, 100 ohms 5%, Pb-free) Example: WHSP2R-100RJT15 (WHSP2R radially formed & taped, ohms 5%, Pb-free) W H S P 2 1 R - 1 0 2 0 R J 3 T 1 4 5 5 1 2 3 4 5 Type Leadforming Value Tolerance Packing WHSP2 R = Radial taped 3/4Rcharacters = ohms WHS3 F = 1% T15 G = 2% A2 J = 5% T1 WHSP2R Tape & reel 1500/reel Ammo pack 2000/box Tape & reel 1000/reel WHS3R 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. MFP REPLACEMENT BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc Example: MFP2-4K7FI (MFP2, 4.7 kilohms 1%, Pb-free) 03.20