PRODUCT BULLETIN PR-SERIES WILLOW TECHNOLOGIES LTD. SHAWLANDS COURT, NEWCHAPEL ROAD LINGFIELD, SURREY, RH7 6BL, ENGLAND Tel. + 44 (0) 1342 835234 Fax. + 44 (0) 1342 834306 E-mail [email protected] Website http://www.willow.co.uk ULTRA PRECISION METAL FILM RESISTORS Low Temperature Coefficients Tight Tolerances High Stability Low Noise CL - CL MAX L. Dimensions Style LL LEAD D. MAX D. Dimensional Correlation In. .016 .025 .062 .072 .102 .125 .150 .161 .170 .200 .280 .300 .400 .416 .450 .600 .685 1.250 1.500 PR1/20B PR1/10 PR1/8A PR1/8 PR1/4A PR1/4 .406 .635 1.57 1.83 2.59 3.18 3.81 4.04 4.32 5.08 7.11 7.62 10.16 10.57 11.43 15.24 17.40 31.75 38.10 Max. L. Max. Dia. CL to CL Lead Dia. Lead Length .170 .280 .280 .400 .416 .600 .072 .102 .102 .150 .161 .200 .200 .300 .300 .450 .450 .685 .020 AWG #24 .025 AWG #22 .025 AWG #22 .025 AWG #22 .025 AWG #22 .025 AWG #22 1.25±.065 1.50±.125 1.50±.125 1.50±.125 1.50±.125 1.50±.125 Specifications Style mm In Inches Resistance Range Ohms Power Rating @85 C Maximum Voltage 10R-300K 10R-500K 10R-500K 10R-1M 10R-1M 50R-1.5M 1/20 1/10 1/8 1/8 1/4 1/4 200V 300V 300V 400V 400V 500V PR1/20B PR1/10 PR1/8A PR1/8 PR1/4A PR1/4 Typical Performance (100 ohms – 100K) % R Ref: EIA RS-186 (where applicable) % R Effects Of Solder..............…………........<0.01 1000 Hr. Load Life At 85 C…………. 0.02 Dielectric Withstanding......………….......<0.01 Humidity...……………………………… 0.04 Noise.....…………………..……………..<-30dB Thermal Shock ......……………….......<0.01 Insulation Resistance ....…...<10000 M. OHM Short Time Overload...………….........<0.01 Shelf Life ……………………......<50 PPM/YR. Temperature Coefficients TC25=0 TC20=0 TC15=0 TC10=0 TC5 =0 25 PPM/ 20 PPM/ 15 PPM/ 10 PPM/ 5 PPM/ C – 20 to +85 C – 20 to +85 C – 20 to +85 C – 20 to +85 C – 20 to +85 C C C C C Resistance Tolerances 1.0%, 0.5%, .25%, 0.1%, .05%, .02%, .01% Lead Material The core material is O.F.H.C. and is electroplated with a coating of 60/40 tin/lead. Matched Sets and Networks Customized resistance and temperature coefficient matching are available. Resistance matching to .01% and T.C. tracking of 1 PPM/ C are standard. Please consult the factory for details on your requirements. DEDICATION TO EXCELLENCE Subject to change without notice