NT Features IA PL M CO S *R oH Applications Two resistance-matched PTCs in a ceramic housing Aids compliance with: - ITU-T K.20/21/45 - Telcordia GR-1089-CORE - UL 60950, 3rd Ed. Narrow resistance tolerance RoHS compliant* Used as a secondary overcurrent protection device in: Customer Premise Equipment (CPE) Central Office (CO) Access equipment CMF-RD Series - Telecom CPTC Resettable Fuses Electrical Characteristics Resistance Matching In Housing Hold Current Hold Current Trip Current Imax @ 230 VAC Time to Trip @ Imax/ 230 VAC Tolerance Ohms Amps @ 25 C Amps @ 40 C Amps @ 25 C Amps Seconds 50 20 % 0.5 0.09 0.06 0.19 3.0 < 0.1 50 10 % 0.5 0.09 0.06 0.19 3.0 < 0.1 Induction Voltage Withstand Rated Voltage VAC Volts Ohms CMF-RD50 600 230 CMF-RD50-10 600 230 Model Rated Resistance (RN) Test Procedures And Requirements For Model CMF-RD Series Primary Test Protection Test Condition Requirements* Mains Power Contact - ITU-T K.20, K.21 ....None................230 V rms, 10 ohms, 15 Min. ......................................................(Ri-Rf) / Ri < 10 % Power Induction - ITU-T K.20, K.21..............None................600V rms, 600 ohms, 0.2 seconds, 10 cycles, every 1 Min. ......(Ri-Rf) / Ri < 10 % Power Induction - ITU-T K.20, K.21..............GDT ................600 V rms, 600 ohms, 1 second, 10 cycles, every 1 Min. ..........(Ri-Rf) / Ri < 10 % Power Induction - ITU-T K.20, K.21..............GDT ................600 V rms, 200 ohms, 1 second, 10 cycles, every 1 Min. ..........(Ri-Rf) / Ri < 10 % Lightning Surge - ITU-T K.20, K.21 ......................................10/700 s, 25 ohms, 1.0 kV, 10 Tests, every 1 Min. ..................(Ri-Rf) / Ri < 10 % Lightning Surge......................................................................10/1000 s, 40 ohms, 1.0 kV, 30 Tests, every 3 Min. ................(Ri-Rf) / Ri < 10 % Overvoltage Withstand ..........................................................300 V, 3 A, 4 Hours, 1 Time ........................................................(Ri-Rf) / Ri < 10 % Failure Mode ..........................................................................300 V, RL=0, 60 Min. ..................................................................** Ri = R initial Rf = R final ** Circuit disconnected or high resistance is acceptable. Product Dimensions Typical Part Marking Represents total content. Layout may vary. SIDE FRONT 8.8 0.2 (.346 .008) 10.0 0.2 (.394 .008) MANUFACTURER'S TRADEMARK CERAMIC CASE 9.3 0.2 (.366 .008) 1 & 3 = FRONT PINS 2 & 4 = BACK PINS 1.5 (.059) 1 0.6 (.236) 0.75 (.030) 2 2.0 (.079) C50M7G BI-WEEKLY DATE CODE: WEEK 13-14 = G YEAR CODE: 7 = 2007 4 3 4.7 0.1 (.185 .039) 0.35 (.014) TOP PART IDENTIFICATION: 50M = CMF-RD50 50K = CMF-RD50-10 How to Order CMF - RD 50 - 10 - 0 BOTTOM Product Designator 1 6.0 (.236) 3 8.8 0.2 (.346 .008) 5.0 0.2 (.197 .008) 2 3.5 (.138) 2.5 0.1 (.098 .004) Packaging options: BULK: 96 pcs. per plastic box PINS 1 & 2 = 1ST CPTC PINS 3 & 4 = 2ND CPTC Style RD = Radial Dual Package Rated Resistance (RN) 50 (50 Ohms) Rated Resistance Tolerance -10 = 10 % Blank = 20 % (Standard) 4 5.0 0.2 (.197 .008) Packaging Options - 0 = Bulk Packaging DIMENSIONS = MM (INCHES) *RoHS Directive 2002/95/EC Jan 27 2003 including Annex. Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications. Reliable Electronic Solutions CMF-RD SERIES, REV. A, 04/07 COPYRIGHT(c) 2007, BOURNS, INC. LITHO IN U.S.A., MF0705 03/07 Asia-Pacific: Tel: +886-2 2562-4117 * Fax: +886-2 2562-4116 Europe: Tel: +41-41 768 5555 * Fax: +41-41 768 5510 The Americas: Tel: +1-951 781-5500 * Fax: +1-951 781-5700 www.bourns.com