*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.
CMF-SD Series - Telecom CPTC Resettable Fuses
Induction Rated Resistance Time to Trip
Voltage Rated Resistance Matching Hold Trip Imax @ @ Imax/
Model Withstand Voltage (RN) In Housing Current Current 230 VAC 230 VAC
VAC Volts Ohms Tolerance Ohms Amps @ 25 °C Amps @ 25 °C Amps Seconds
CMF-SD25 600 230 25 ±20 % ± 0.5 0.130 0.260 2.8 < 0.3
CMF-SD35 600 230 35 ±20 % ± 0.5 0.100 0.200 3 < 0.2
CMF-SD35A 600 230 35 ±20 % ± 0.5 0.100 0.200 2.5 < 0.2
CMF-SD50 600 230 50 ±20 % ± 0.5 0.090 0.190 3 < 0.1
CMF-SD50A 600 230 50 ±20 % ± 0.5 0.090 0.190 3 < 0.1
Electrical Characteristics
Features
■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*
Applications
Used as a secondary overcurrent protection
device in:
■Customer Premise Equipment (CPE)
■Central Office (CO)
■Access equipment
*RoHS COMPLIANT
How to Order
CMF - SD 35 A - 0
Product Designator
Style
SD = Surface Mount Dual Package
Rated Resistance (RN)
25, 35, 50 (25, 35, 50 Ohms)
Reduced Footprint and Height Option
Packaging Options
- 0 = Bulk Packaging
- 2 = Tape & Reel
Typical Part Marking
Represents total content. Layout may vary.
Product Dimensions Recommended Pad Layout
Packaging options:
BULK: 640 pcs. per bag
TAPE & REEL: CMF-SD25, CMF-SD35 & CMF-SD50 = 400 pcs. per reel;
CMF-SD35A & CMF-SD50A = 500 pcs. per reel
MM
(INCHES)
DIMENSIONS =
A
B
F
E
D
C
B
1
2
3
4
A
F
E
D
C
H
G
356G
MANUFACTURER'S
TRADEMARK
PART
IDENTIFICATION:
25 = CMF-SD25
35 = CMF-SD35
50 = CMF-SD50
35A = CMF-SD35A
50A = CMF-SD50A
YEAR CODE:
6 = 2006
BI-WEEKLY
DATE CODE:
WEEK 13-14 = G
CMF-SD25/
CMF-SD35/ CMFSD35A/
Dim. CMF-SD50 CMF-SD50A
A
B
C
D
E
F
9.00
(.354) MAX.
10.80
(.425) MAX.
10.20
(.402) MAX.
4.88 - 5.28
(.192 - .208)
2.41 - 2.61
(.095 - .103)
7.15
(.281) MAX.
8.50
(.335) MAX.
8.10
(.319) MAX.
3.25 - 3.65
(.128 - .144)
2.41 - 2.61
(.095 - .103)
0.5
(.020)
CMF-SD25/
CMF-SD35/ CMF-SD35A/
Dim. CMF-SD50 CMF-SD50A
A
B
C
D
E
F
G
H
10.0
(.394)
8.80
(.346)
3.20
(.126)
2.00
(.079)
2.60
(.102)
8.00
(.315)
7.05
(.278)
2.75
(.108)
2.00
(.079)
2.51
(.099)
5.00
(.197)
7.60
(.299)
3.45
(.136)
5.95
(.234)
10.0
(.394)
8.15
(.321)
12
34
MAX. 0.5
(.020) MAX.
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
Solder Reflow Recommendations
160–220
300
250
200
150
100
50
0
10–20
Temperature (°C)
120
Preheating Soldering Cooling
Time (seconds)
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.
CMF-SD Series - Telecom CPTC Resettable Fuses
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
Reliable Electronic Solutions
CMF-SD SERIES, REV. E, 05/22/07
CMF-SD25-2
CMF-SD35-2 CMF-SD35A-2
Tape Dimensions per EIA 481-2 CMF-SD50-2 CMF-SD50A-2
W
P0
P1
P2
A0
B0
D0
F
E1
T max.1
K0
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
CMF-SD Series Tape and Reel Specifications
UNIT = MM
(INCHES)
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)
1.75 ± 0.10
(0.069 ± 0.004)
11.0 ± 0.10
(0.433 ± 0.004)
11.5 ± 0.10
(0.453 + 0.004)
1.5 +0.10/-0.0
(0.059 +0.004/-0.0)
T
K
5°
0
A0
P
B0
F
P2P0E
W
0.50
(.020)
K0
A0
B0
P
F
DP2
D1
P0E
W
A0
K1
4.5
(.177)
9.1
(.358)
8 °
20 °
13.2 +0.2/-0
(.520 +.008/-0
16.4 +2.0/-0
(.646 +.079/-0)
16.4 +2.0/-0
(.646 +.079/-0)
22.4
(.882)
MAX.
22.4
(.882)
MAX.
330 -2/+0
(12.99 -.079/+0)
DIA.
100 ± 1.5
(3.94 ± .059) DIA.
13.2 +0.2/-0
(.520 +.008/-0
330 -2/+0
(12.99 -.079/+0)
DIA.
100 ± 1.5
(3.94 ± .059)
DIA.
D
0.50
(0.020)
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)
1.75 ± 0.10
(0.069 ± 0.004)
8.80 ± 0.10
(0.346 ± 0.004)
7.5 ± 0.10
(0.295 + 0.004)
1.5 +0.10/-0.0
(0.059 +0.004/-0.0)
0.50
(0.020)
CMF-SD25-2
CMF-SD35-2
CMF-SD50-2
CMF-SD35A-2
CMF-SD50A-2
