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Features
NT S CO M PL
Applications
Used as a secondary overcurrent protection device in: Customer Premise Equipment (CPE) Central Office (CO) Access equipment

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*
*R
oH
IA
CMF-SD Series - Telecom CPTC Resettable Fuses
Electrical Characteristics
Induction Voltage Withstand VAC Rated Resistance (RN) Ohms Tolerance Resistance Matching In Housing Ohms Time to Trip @ Imax/ 230 VAC Seconds
Model
Rated Voltage Volts
Hold Current
Trip Current
Imax @ 230 VAC Amps
Amps @ 25 C Amps @ 25 C
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 Product Dimensions
A
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
0.130 0.130 0.100 0.100 0.100 0.100 0.090 0.090 0.090 0.090
0.260 0.260 0.200 0.200 0.200 0.200 0.190 0.190 0.190 0.190
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
Recommended Pad Layout
B
Dim.
B
CMF-SD25 CMF-SD35 CMF-SD50
9.00 MAX. (.354) 10.80 MAX. (.425) 10.20 MAX. (.402) 4.88 - 5.28 (.192 - .208) 2.41 - 2.61 (.095 - .103) 0.5 MAX. (.020)
CMFSD35A CMF-SD50A
7.15 MAX. (.281) 8.50 MAX. (.335) 8.10 MAX. (.319) 3.25 - 3.65 (.128 - .144) 2.41 - 2.61 (.095 - .103) 0.5 MAX. (.020)
1 2 A 3 F 4 G
A B
F
C
MM (INCHES)
E D
DIMENSIONS =
C H
D
E
D E
C
1
2
Packaging options: TAPE & REEL: CMF-SD25, CMF-SD35 & CMF-SD50 = 400 pcs. per reel; CMF-SD35A & CMF-SD50A = 500 pcs. per reel
F
3
4
Typical Part Marking
Represents total content. Layout may vary.
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 BI-WEEKLY DATE CODE: WEEK 13-14 = G YEAR CODE: 6 = 2006
How to Order
CMF - SD 35 A -10 - 2
Product Designator Style SD = Surface Mount Dual Pkg. Rated Resistance (RN) 25, 35, 50 (25, 35, 50 Ohms) Reduced Footprint and Height Option Resistance Tolerance Option Blank = Standard (20 %) -10 = 10 % Packaging Options - 2 = Tape & Reel
CMF-SD25/ CMF-SD35/ Dim. CMF-SD50 A B C D E F G
10.0 (.394) 8.80 (.346) 3.20 (.126) 2.00 (.079) 2.60 (.102) 5.00 (.197) 7.60 (.299) 10.0 (.394)
CMF-SD35A/ CMF-SD50A
8.00 (.315) 7.05 (.278) 2.75 (.108) 2.00 (.079) 2.51 (.099) 3.45 (.136) 5.95 (.234) 8.15 (.321)
356G
*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.
H
CMF-SD Series - Telecom CPTC Resettable Fuses
Solder Reflow Recommendations
300 250 200 150 100 50 0 160-220 10-20 Time (seconds) 120
Preheating
Soldering
Cooling
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.
Temperature (C)
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
24.0 +0.30/-0.10 (0.945 +0.012/-0.004 ) 4.00 0.10 (0.157 0.004) 16.0 0.10 (0.630 0.004) 2.00 0.10 (0.079 0.004) 10.2 0.10 (0.402 0.004) 9.0 0.10 (0.354 0.004) 1.5 +0.10/-0.0 (0.059 +0.004/-0.0) 11.5 0.10 (0.453 + 0.004) 1.75 0.10 (0.069 0.004) 0.50 (0.020) 11.0 0.10 (0.433 0.004)
Tape Dimensions per EIA 481-2 W P0 P1 P2 A0 B0 D0 F E1 T max.1 K0
D
P2 P0
CMF-SD35A-2 CMF-SD50A-2
16.0 0.10 (0.630 0.004 ) 4.00 0.10 (0.157 0.004) 12.0 0.10 (0.472 0.004) 2.00 0.10 (0.079 0.004) 8.35 0.10 (0.329 0.004) 8.30 0.10 (0.327 0.004) 1.5 +0.10/-0.0 (0.059 +0.004/-0.0) 7.5 0.10 (0.295 + 0.004) 1.75 0.10 (0.069 0.004) 0.50 (0.020) 8.80 0.10 (0.346 0.004)
E
T
CMF-SD25-2 CMF-SD35-2 CMF-SD50-2
F W
330 -2/+0 (12.99 -.079/+0) DIA.
B0 P A0 5 K0
16.4 +2.0/-0 (.646 +.079/-0)
MAX. 22.4 (.882)
13.2 +0.2/-0 (.520 +.008/-0 100 1.5 DIA. (3.94 .059)
CMF-SD35A-2 CMF-SD50A-2
D
P2
P0
E
0.50 (.020)
D1
F W B0 330 -2/+0 (12.99 -.079/+0) DIA.
P 20 8
A0
K1 K0 9.1 (.358)
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.
UNIT =
MM (INCHES)
4.5 (.177) A0
Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.

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