PrecisionMetal Metal Precision Film FilmResistors Resistors Welwyn Components PR series PR series Low cost precision resistors s Low costdown precision resistors Tolerances to 0.1% down to 0.1% s Tolerances TCR down to 15ppm/C s TCR down to 15ppm/C * * * Electrical Data PR4 Power rating at 70C watts Resistance range ohms Limiting element voltage volts PR5 0.5 0.25 100R - 1M 250 350 TCR (20C to 70C) ppm/C 240K: 15, 25, 50 Resistance tolerance % 500K: 0.1, 0.25, 0.5, 1 Standard values >240K: 25, 50 >500K: 0.25, 0.5, 1 E24, E96 Thermal impedance C/watt Ambient temperature range 140 C 112 -55 to 155 Physical Data Dimensions (mm) & Weight (g) Type L Max D Max f min d nom PC mounting centres PR4 6.2 2.5 21 0.6 10.2 PR5 9.0 3.6 19.6 0.8 12.7 Min. bend radius Wt. nom 0.6 0.3 1.2 0.5 Construction Terminations The resistance element is a precisely controlled thin film of metal alloy sputtered on to a high purity ceramic core, protected by a moisture-resistant, high dielectric strength coating applied so that terminations remain completely clear. Material Strength This permits a well defined body length (clean lead to clean lead dimension L). Marking Solderability d D L f Hot tin dipped copper wire The terminations meet the requirements of IEC 68.2.21 The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2 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 Note General 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 Welwyn's own data and is considered accurate at time of going to print. All information is subject to TT electronics' own data and is considered accurate at time of going to print. A subsidiary of TT electronics plc www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) Welwyn Components Limited * Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 (c) TT electronics plc822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com 182 03.10 09. 11 Precision Metal Film Resistors Precision Precision Metal PR series Metal Film FilmResistors Resistors PR series PR series Performance Data Welwyn Components Welwyn Components Maximum Performance Data R % Load: 1000 hours at 70C 0.5 Derating from rated power at 70C zero at 155C Maximum 0.25 R % R R% % Short term overload Load: 1000 hours at 70C Climatic D erating category from rated power at 70C Climatic Short term overload Long term damp heat 0 0..5 5 ze55/125/56 ro at 155C R% % R R R% % 00..255 .55 00.2 Long termand damp heat Vibration bump ITemperature nsulation resirapid stancechange R % R R% % oRhm %s 55/125/56 0.25 0 0..5 1 Resistance V oltage proto of solder heat Vibration and bump vRo% lts R % Insulation resistance ohms Climatic Temperature rapid change Climatic category Resistance to solder heat Packaging Voltage proof 2G 5 >0.1 0 . 2 PR4: 500 min,5PR5: 700 min 0.1 > 1G volts PR4: 500 min, PR5: 700 min All PR resistors are supplied tape packed ready for loading on to automatic sequencing and insertion machines. Packaging 5 Component wires not protrude beyond thefor outside edge All PR resistors are will supplied tape packed ready loading on of automatic the tapes. sequencing and insertion machines. to 5 Alternative packaging by request. Component wires will available not protrude beyond the outside edge of the tapes. Lead formed resistors can also be supplied. Standard options of Lancet, Radial and Goalpost are available. Alternative packaging available forming by request. 6 Lead formed resistors can also be supplied. Standard options of Lancet, Radial and Goalpost forming are available. Body location f1 - f2 1.4 mm f1 f2 52 6 Body location f1 - f2 1.4 mm f1 f2 52 6 6 Ordering Procedure Example: PR4 with TCR of 15ppm/ C at 10 kilohms and 0.1% tolerance in an ammo pack box of 5000 pieces PR4Y- 10KBI Example: PR4 with TCR of 15ppm/ C at 10 kilohms and 0.1% tolerance in an ammo pack box Type of 5000 pieces PR4Y- 10KBI TCR Y 15 ppm/ C Type 25 ppm/ C 50 ppm/ C C TCR Y 15 ppm/ C ppm/ C code) Value25 (use IEC62 50 ppm/ C C Tolerance (use IEC62 code) 0.5% B D code) 0.1% Value (use IEC62 Ordering Procedure 0.25% C F 1% Tolerance (use IEC62 code) Packing 0.5% B D 0.1% C I 0.25% AmmoF Packing I Ammo PR4 1% PR5 5000/box 2500/box Standard PR4 PR5 5000/box 2500/box Standard (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK General Telephone: Note +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com 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. 03.10 www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 (c) TT electronics plc822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com 183 03.10 09. 11 183