UL Recognised Wirewound Resistors
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- Reynold Barker
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1 Resistors UL Recognised UL1412 recognised fusible resistor * Failsafe mains fusing at 12 / 24Vrms Inrush and surge withstanding UL94-V flameproof coating Surface mount ZI-form option * UL file number E All Pb-free parts comply with EU Directive 211/5/EU (RoHS2) Electrical Data ULW2 / ULWP2R ULW3 ULW4 Power rating at 25 C watts second overload rating at 25ºC watts Inrush / surge performance See Pulse Performance graphs Resistance range ohms 1R to 1R TCR ppm/ C ±2 Isolation voltage volts Resistance tolerance % 5 UL recognised standard values ohms Any value in the range 1R to 1R is recognised. E24 preferred Thermal impedance C/watt Ambient temperature range C -55 to +155 Note - no limiting element voltage applies; maximum continuous voltage is (P.R) Physical Data Dimensions (mm) and weight (g) Type L Max D Max f min d nom PCB mount centres Min bend radius Wt. Nom ULW ULW ULW d D L f Construction A high purity ceramic rod is assembled with interference fit end caps to which are welded the terminations. The surge withstanding resistive element is wound on the rod and welded to the caps. Flameproof fusible cement coating is applied prior to marking with indelible ink. The components are then leadformed if required and packed. Marking ULW2, ULWP2R & ULW3 resistors are marked with five colour bands. The first four indicate value and tolerance in conformance with IEC2. The fifth yellow band denotes defined fusibility. ULW4 and resistors are legend marked with type, value and tolerance.
2 Terminations Material: Hot tin dipped copper wire Strength: The terminations meet the requirements of IEC Solderability: The terminations meet the requirements of IEC Clause 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 (1 25 C) ΔR% 5 3 Short term overload (5 x Pr for 5 seconds) ΔR% 5 1 Pulse (see Pulse Performance graphs) ΔR% 5 2 Climatic ΔR% 5 2 Long term damp heat (5 days) ΔR% 5 1 Climatic category 55/2/5 Temperature rapid change ΔR% 5 1 Dry heat (1 2 C) ΔR% 5 3 Vibration ΔR% 5 1 Robustness & solder heat ΔR% 5 1 * Addition of.1ω applies Thermal Performance Derating Curve Body Temperature Rise Proportion of Rated Power (%) Ambient Temperature ( C) Temperature Rise ( C) 3 ULW3 ULW4 25 ULW2 / ULWP2R Power (W)
3 Pulse Performance 1.2/5μs Peak Voltage Limit (1 pulses at 1s intervals, ΔR<5%) Note the voltage show n is the nett voltage across the resistor. The generator open circuit voltage w ill be higher due to the generator's internal impedance. Pulse Energy Limit (single or low repetition rate, ΔR<5%). Energy (J) ULW3 & ULW2 & ULWP2R Value (ohms) Peak Voltage (kv) ULW3 & ULW2 & ULWP2R Value (ohms) Fusing Performance
4 Fusing Performance Fusing Characteristic Maximum Fusing Time (s) Initial Power (W) Notes: 1. Typical fusing times are around 1/3 of the maximum figures. 2. After fusing the resistance value is >1 times the initial nominal value, provided the initial power is at least 2 x rated power. 3. Suitable for fusing at voltages up to 24Vrms.
5 Application Notes 1. If the resistors are Application to dissipate full Notes rated power, it is recommended that the terminations should not be soldered closer than 4mm from the body. (Delete redundant subtitle) 2. Due to operating Application temperature Notes limits imposed by some PCB materials, derating may be necessary. An estimate of the temperature rise to be expected can be calculated using 1. the If thermal resistors impedance are to dissipate figures given full rated under power, Electrical it is Data. recommended that the terminations should not be soldered closer than 4mm from the body. 3. For the purposes of UL approval, the following points should be observed: 3.1 To protect 2. Due to against operating fire under temperature all conditions limits imposed of overload, by some a positive PCB materials, clearance of derating leastmay be necessary. An estimate of the 13mm temperature should be provided rise to between expected the at body the of center the resistor of the body and any can combustible be calculated materials. using the thermal impedance figures given under 3.2 A positive Electrical clearance Data. of 13mm should be provided between the resistor body or terminations and uninsulated parts of opposite polarity or uninsulated dead metal parts. 3.3 Limited 3. For Short the purpose Circuit testing of UL approval, should be the performed following in points the complete should be appliance. observed: 3.1 To protect against fire under all conditions of overload, a positive clearance of at least 13mm should be provided 4. ULW resistors can also between supplied the body with of radial, the resistor goalpost and or any lancet combustible pre-formed materials. leads. In particular ULW2, ULW3, ULW4 and are available in ZI-form SMD are available format packed in ZI-form in 3.2 blister A SMD positive tape format clearance see packed of 13mm in blister should tape be provided - see between the resistor body or terminations and uninsulated parts of opposite polarity or uninsulated dead metal parts. 3.3 Limited Short Circuit testing should be performed in the complete appliance. Radial Goalpost Lancet ZI-form 4. ULW resistors can also be supplied with radial, goalpost or lancet pre-formed leads. In particular ULW2, ULW3, ULW4 and are available in ZI-form SMD format packed in blister tape see (This diagram exists on WP-S, so just copy it) Also a 2W radial taped version* is available as shown below ULWP2R Radial Taped Dimensions (mm) Dimension Also a 2W radial taped version* Notation is available Nominal as shown Tolerance below. Component Body ULWP2R Length Radial Taped Dimensions L (mm) 1. Max Component Body Diameter Dimension Notation D 4. Nominal Max Tolerance Terminal Lead Diameter Component Body Length d L.8 1. Nom Max Component PitchComponent Body Diameter P D Max ±.5 Terminal Lead Diameter d.8 Nom Pitch of Holes Po 12.7 ±.2 Component Pitch P 5 ±.5 P ±.3 Distance between Pitch Hole of & Holes Component Po 1 ±.2 P ±.5 Distance between Hole & P ±.3 Lead Pitch Component FP ± Width of Backing Lead StripPitch WF ± Position of Hole Width of Backing Strip W1W ±.25 ±.3 Diameter of HolePosition of Hole DoW ±.3 ±.25 Height to Lead Form Diameter of Hole HoDo ±.3 Height from Lead Height Formto Lead Form Ho1 Ho Max ±.3 Height from Lead Form Height to Resistor Ho1 Ho2 17. MAX 18. Max Height to Resistor Ho2 18. MIN Width of Adhesive Tape W2 15. ±.5 Width of Adhesive Tape W2 15. ±.5 Length of protrusion l <2.5 Length of protrusion l <2.5 K1 K ±.3 ±.3 Form DimensionsForm Dimensions K2 K ±.5 K3 K ±.25 K4 K4 1. ±.2 *Although body dimensions differ slightly, ULWP2R Performance and Electrical Data are identical to those of ULW2 *Although body dimensions differ slightly, ULWP2R Performance and Electrical Data are identical to those of ULW2
6 Packaging The standard packaging for ULW is taped. The critical dimensions are shown in Figure 1. The component wires will not protrude beyond the outside edge of the tapes. Taped product is then packed into ammo boxes for ULW2, 3 and 4 or onto reels for. Alternative packaging is available by request. The standard packaging for ULWP2R is tape and reel. Pre-formed radial, goalpost & lancet resistors are supplied loose packed in plastic bags or boxes. ZI-form SMD are packed in blister tape see Dimensions (mm) Figure 1 Type b C ULW C ULW3 7 1 ULW4 3 1 f1 b f2 Body location f1 - f2 <1.4mm Ordering Procedure Example: ULW2-33RJA25 (ULW2, 33 ohms ±5%, Pb-free) U L W R J A 2 5 Type Leadforming Value Tolerance Packing ULW2 Optional code 3/4 characters J = ±5% A25 ULW2 Ammo pack, 25/box ULW3 R = ohms A1 ULW3, ULW4 Ammo pack, 1/box ULW4 T75 Tape & reel, 75/reel Example: ULWP2R-33RJT15 (ULWP2R radially formed & taped, 33 ohms ±5%, Pb-free) U L W P 2 R R J T 1 5 Type Leadforming Value Tolerance Packing ULWP2 R = Radial taped 3/4 characters J = ±5% T15 Tape & reel, 15/reel R = ohms
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