NT Features S CO M PL IA ■ *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-SD Series - Telecom CPTC Resettable Fuses Electrical Characteristics Model Induction Voltage Withstand Rated Voltage VAC Volts Ohms Tolerance Ohms 600 600 600 600 600 600 600 600 600 600 230 230 230 230 230 230 230 230 230 230 25 25 35 35 35 35 50 50 50 50 ±20 % ±10 % ±20 % ±10 % ±20 % ±10 % ±20 % ±10 % ±20 % ±10 % ± 0.5 ± 0.5 ± 0.5 ± 0.5 ± 0.5 ± 0.5 ± 0.5 ± 0.5 ± 0.5 ± 0.5 CMF-SD25 CMF-SD25-10 CMF-SD35 CMF-SD35-10 CMF-SD35A CMF-SD35A-10 CMF-SD50 CMF-SD50-10 CMF-SD50A CMF-SD50A-10 Rated Resistance (RN) Resistance Matching In Housing Hold Current Trip Current Imax @ 230 VAC Time to Trip @ Imax/ 230 VAC Amps Seconds 2.8 2.8 3 3 2.5 2.5 3 3 3 3 < 0.3 < 0.3 < 0.2 < 0.2 < 0.2 < 0.2 < 0.1 < 0.1 < 0.1 < 0.1 Amps @ 25 °C Amps @ 25 °C 0.130 0.130 0.100 0.100 0.100 0.100 0.090 0.090 0.090 0.090 Product Dimensions 0.260 0.260 0.200 0.200 0.200 0.200 0.190 0.190 0.190 0.190 Recommended Pad Layout B A B Dim. CMF-SD25 CMF-SD35 CMF-SD50 CMFSD35A CMF-SD50A A 9.00 MAX. (.354) 7.15 MAX. (.281) B 10.80 MAX. (.425) 8.50 MAX. (.335) C 10.20 MAX. (.402) 8.10 MAX. (.319) D 4.88 - 5.28 (.192 - .208) 3.25 - 3.65 (.128 - .144) E 2.41 - 2.61 (.095 - .103) 2.41 - 2.61 (.095 - .103) F 0.5 MAX. (.020) 1 2 A 3 G F 4 F DIMENSIONS = MM (INCHES) E D C Packaging options: TAPE & REEL: CMF-SD25, CMF-SD35 & CMF-SD50 = 400 pcs. per reel; CMF-SD35A & CMF-SD50A = 500 pcs. per reel Typical Part Marking PART IDENTIFICATION: 25 = CMF-SD25 35 = CMF-SD35 50 = CMF-SD50 35A = CMF-SD35A 50A = CMF-SD50A 25K = CMF-SD25-10 35K = CMF-SD35-10 50K = CMF-SD50-10 35AK = CMF-SD35A-10 50AK = CMF-SD50A-10 MANUFACTURER'S TRADEMARK 356G BI-WEEKLY DATE CODE: WEEK 13-14 = G YEAR CODE: 6 = 2006 CMF - SD 35 A -10 - 2 Product Designator Style SD = Surface Mount Dual Pkg. Rated Resistance (RN) 25, 35, 50 (25, 35, 50 Ohms) Packaging Options - 2 = Tape & Reel *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. E H 1 2 3 4 CMF-SD25/ CMF-SD35/ Dim. CMF-SD50 CMF-SD35A/ CMF-SD50A A 10.0 (.394) 8.00 (.315) B 8.80 (.346) 7.05 (.278) C 3.20 (.126) 2.75 (.108) D 2.00 (.079) 2.00 (.079) E 2.60 (.102) 2.51 (.099) F 5.00 (.197) 3.45 (.136) G 7.60 (.299) 5.95 (.234) H 10.0 (.394) 8.15 (.321) Reduced Footprint and Height Option Resistance Tolerance Option Blank = Standard (20 %) -10 = 10 % D 0.5 MAX. (.020) How to Order Represents total content. Layout may vary. C CMF-SD Series - Telecom CPTC Resettable Fuses Solder Reflow Recommendations 300 Preheating Soldering Cooling 10–20 120 Temperature (°C) 250 200 150 100 50 0 160–220 Solder reflow • Recommended reflow methods: IR, vapor phase oven, hot air oven. • Devices are not designed to be wave soldered to the bottom side of the board. • Gluing the devices is not recommended. • Recommended maximum paste thickness is 0.25 mm (.010 inch). • Devices can be cleaned using standard industry methods and solvents. Note: • If reflow temperatures exceed the recommended profile, devices may not meet the performance requirements. Rework • A device should not be reworked. Time (seconds) Reliable Electronic Solutions 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 CMF-SD SERIES, REV. F, 08/07 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications. CMF-SD Series Tape and Reel Specifications CMF-SD25-2 CMF-SD35-2 CMF-SD50-2 Tape Dimensions per EIA 481-2 CMF-SD35A-2 CMF-SD50A-2 W 24.0 +0.30/-0.10 (0.945 +0.012/-0.004 ) 16.0 ± 0.10 (0.630 ± 0.004 ) P0 4.00 ± 0.10 (0.157 ± 0.004) 4.00 ± 0.10 (0.157 ± 0.004) P1 16.0 ± 0.10 (0.630 ± 0.004) 12.0 ± 0.10 (0.472 ± 0.004) P2 2.00 ± 0.10 (0.079 ± 0.004) 2.00 ± 0.10 (0.079 ± 0.004) A0 10.2 ± 0.10 (0.402 ± 0.004) 8.35 ± 0.10 (0.329 ± 0.004) B0 9.0 ± 0.10 (0.354 ± 0.004) 8.30 ± 0.10 (0.327 ± 0.004) D0 1.5 +0.10/-0.0 (0.059 +0.004/-0.0) 1.5 +0.10/-0.0 (0.059 +0.004/-0.0) F 11.5 ± 0.10 (0.453 + 0.004) 7.5 ± 0.10 (0.295 + 0.004) E1 1.75 ± 0.10 (0.069 ± 0.004) 1.75 ± 0.10 (0.069 ± 0.004) 0.50 (0.020) 0.50 (0.020) 11.0 ± 0.10 (0.433 ± 0.004) 8.80 ± 0.10 (0.346 ± 0.004) T max.1 K0 D P2 P0 E CMF-SD25-2 CMF-SD35-2 CMF-SD50-2 T F W 330 -2/+0 (12.99 -.079/+0) DIA. B0 P A0 K0 16.4 +2.0/-0 (.646 +.079/-0) 5° CMF-SD35A-2 CMF-SD50A-2 D P2 P0 F W P B0 K1 A0 20 ° 8° K0 9.1 (.358) UNIT = 13.2 +0.2/-0 (.520 +.008/-0 100 ± 1.5 DIA. (3.94 ± .059) 0.50 (.020) E D1 MAX. 22.4 (.882) 330 -2/+0 (12.99 -.079/+0) DIA. 16.4 +2.0/-0 (.646 +.079/-0) MAX. 22.4 (.882) 13.2 +0.2/-0 (.520 +.008/-0 100 ± 1.5 (3.94 ± .059) DIA. MM (INCHES) 4.5 (.177) A0 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.