Resistors Precision Metal Precision Metal Film Resistors Welwyn Components Film Resistors PR series PR series Low cost precision resistors Tolerances down to 0.1% Low cost precision resistors Tolerances down to 0.1% TCR down to 15ppm/C TCR down to 15ppm/C All Pb-All Pb-frfreeee parts c parts comply omply with EU Dirwith EU Directivective e 2011/65/EU amended b2011/65/EU amended by y (EU) 2015/863 (R(EU) 2015/863 (RoHS3)oHS3) Electrical Data PR4 PR5 Power rating at 70C watts 0.5 0.25 Resistance range ohms 100R 1M Limiting element voltage volts 250 350 TCR (20C to 70C) ppm/C 240K: 15, 25, 50 >240K: 25, 50 Resistance tolerance % 500K: 0.1, 0.25, 0.5, 1 >500K: 0.25, 0.5, 1 Standard values E24, E96 Thermal impedance C/watt 140 112 Ambient temperature range C -55 to 155 Physical Data Dimensions (mm) & Weight (g) PC Min. Wt. nom mounting bend centres radius Type L Max D Max f min d nom d D PR4 6.2 2.5 21 0.6 10.2 0.6 0.3 L f 12.7 PR5 9.0 3.6 19.6 0.8 1.2 0.5 Terminations Construction Material Hot tin dipped copper wire The resistance element is a precisely controlled thin film of Strength The terminations meet the requirements of metal alloy sputtered on to a high purity ceramic core, IEC 68.2.21 protected by a moisture-resistant, high dielectric strength Solderability The terminations meet the requirements of coating applied so that terminations remain completely clear. IEC 115-1, Clause 4.17.3.2 This permits a well defined body length (clean lead to clean Marking lead dimension L). 25ppm/C resistors are colour coded with 5 bands. The other grades have an additional 6th band indicating TCR which is orange for 15ppm/C and red for 50ppm/C. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. General Note General Note BI Technologies IRC Welwyn Welwyn Components reserves the right to make changes in product specification without notice or liability. TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of All information is subject to TT Electronics own data and is considered accurate at time of going to print. TT electronics plc www.ttelectronics.com/resistors 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 03.10 TT Electronics plc 03.20 182mo K = = NLRLMP = =UWRU= ~ = = m~= O Precision Metal Precision Metal Film Resistors Film Resistors Welwyn Components PR series PR series Performance Data Maximum Load: 1000 hours at 70C R % 0.5 Derating from rated power at 70 C zero at 155 C Short term overload R % 0.25 Climatic R % 0.5 Climatic category 55/155/56 Long term damp heat R % 0.5 Temperature rapid change R % 0.25 Resistance to solder heat R % 0.25 Vibration and bump R % 0.1 Insulation resistance ohms > 1G Voltage proof volts PR4: 500 min, PR5: 700 min Packaging All PR resistors are supplied tape packed ready for loading on to automatic sequencing and insertion machines. 5 Component wires will not protrude beyond the outside edge of the tapes. Alternative packaging available by request. f f 1 2 6 52 6 Lead formed resistors can also be supplied. Standard options Body location f f 1.4 mm of Lancet, Radial and Goalpost forming are available. 1 2 Ordering Procedure Example: PR4Y-10KBI (PR4 with TCR 15ppm/C at 10 kilohms 0.1%, Pb-free) Ordering Procedure Example: PR4 with TCR of 15ppm/C at 10 kilohms and 0.1% tolerance in an ammo pack box P R 4 Y - 1 0 K B I of 5000 pieces - 1 2 3 4 5 P R 4 Y 1 0 K B I Type 1 2 3 4 5 TCR Type TCR Value Tolerance Packing Y 15 ppm/ C PR4 Y = 15ppm/C B = 0.1% PR4 5000/box E24 = 3/4 characters 25 ppm/ C I Ammo PR5 Blank = 25ppm/C C = 0.25% PR5 2500/box E96 = 3/4 characters C 50 ppm/ C C = 50ppm/C R = ohms D = 0.5% K = kilohms F = 1% M = megohms Value (use IEC62 code) Tolerance (use IEC62 code) B 0.1% D 0.5% C 0.25% F 1% Packing PR4 5000/box I Ammo Standard PR5 2500/box 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 Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK TT Electronics plcTelephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com 03.10 03.20 183