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 µs, 25 ohms, 1.0 kV, 10 Tests, every 1 Min. ..................(Ri-Rf) / Ri < ±10 % Lightning Surge......................................................................10/1000 µs, 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© 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