CMF-SD25A-2 [BOURNS]
PTC Resettable Fuse, 25ohm, Surface Mount, ROHS COMPLIANT;
| 型号： | CMF-SD25A-2 |
| 厂家： | 
BOURNS ELECTRONIC SOLUTIONS |
| 描述： | PTC Resettable Fuse, 25ohm, Surface Mount, ROHS COMPLIANT |
| 文件： | 总3页 (文件大小：331K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Features
Applications
Used as a secondary overcurrent protection
device in:
■ 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.
■ Customer Premise Equipment (CPE)
■ Central Office (CO)
■ Access equipment
■ Narrow resistance tolerance
■ RoHS compliant*
CMF-SD Series - Telecom CPTC Resettable Fuses
Electrical Characteristics
Induction
Voltage
Withstand Voltage
Rated
Resistance
(RN)
Resistance
Matching
In Housing
Time to Trip
@ Imax/
230 VAC
Rated
Hold
Current
Trip
Current
Imax @
230 VAC
Model
VAC
600
600
600
600
600
600
600
600
600
600
600
600
Volts
230
230
230
230
230
230
230
230
230
230
230
230
Ohms Tolerance
Ohms
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
Amps @ 25 °C Amps @ 25 °C
Amps
2.8
2.8
2.8
2.8
3
Seconds
< 0.3
< 0.3
< 0.3
< 0.3
< 0.2
< 0.2
< 0.2
< 0.2
< 0.1
< 0.1
< 0.1
< 0.1
CMF-SD25
25
25
25
25
35
35
35
35
50
50
50
50
20 ꢀ
10 ꢀ
20 ꢀ
10 ꢀ
20 ꢀ
10 ꢀ
20 ꢀ
10 ꢀ
20 ꢀ
10 ꢀ
20 ꢀ
10 ꢀ
0.130
0.130
0.130
0.130
0.100
0.100
0.100
0.100
0.090
0.090
0.090
0.090
0.260
0.260
0.260
0.260
0.200
0.200
0.200
0.200
0.190
0.190
0.190
0.190
CMF-SD25-10
CMF-SD25A
CMF-SD25A-10
CMF-SD35
CMF-SD35-10
CMF-SD35A
CMF-SD35A-10
CMF-SD50
3
2.5
2.5
3
3
3
CMF-SD50-10
CMF-SD50A
CMF-SD50A-10
3
Product Dimensions
Recommended Pad Layout
B
A
CMF-SD25
CMF-SD25A
CMF-SD35A
CMF-SD50A
CMF-SD35
Dim. CMF-SD50
1
9.00
(.354)
7.15
MAX.
(.281)
MAX.
2
A
B
B
A
3
10.80
(.425)
8.50
MAX.
(.335)
G
MAX.
MAX.
H
F
4
10.20
(.402)
8.10
MAX.
(.319)
C
D
E
G
F
D
E
4.88 - 5.28
(.192 - .208)
3.25 - 3.65
(.128 - .144)
C
E
H
MM
(INCHES)
DIMENSIONS =
2.41 - 2.61
(.095 - .103)
2.41 - 2.61
(.095 - .103)
D
1
2
4
C
0.5
0.5
MAX.
(.020)
MAX.
(.020)
F
Packaging options:
TAPE & REEL: CMF-SD25, CMF-SD35 & CMF-SD50
= 400 pcs. per reel;
2.5
(.098)
2.5
(.098)
3
G
H
CMF-SD25A, CMF-SD35A & CMF-SD50A
= 500 pcs. per reel
1.0
(.039)
1.0
(.039)
CMF-SD25
CMF-SD35
CMF-SD25A
CMF-SD35A
CMF-SD50A
8.00
Dim. CMF-SD50
10.0
Typical Part Marking
How to Order
CMF - SD 35 A -10 - 2
Represents total content. Layout may vary.
A
(.394)
(.315)
8.80
(.346)
7.05
(.278)
MANUFACTURER'S
TRADEMARK
PART
IDENTIFICATION:
25 = CMF-SD25
Product Designator
B
C
D
E
Style
3.20
(.126)
2.75
(.108)
35 = CMF-SD35
SD = Surface Mount Dual Pkg.
BI-WEEKLY
DATE CODE:
WEEK 13-14 = G
50 = CMF-SD50
356G
Rated Resistance (RN)
25, 35, 50 (25, 35, 50 Ohms)
25A = CMF-SD25A
35A = CMF-SD35A
50A = CMF-SD50A
25K = CMF-SD25-10
35K = CMF-SD35-10
50K = CMF-SD50-10
25AK = CMF-SD25A-10
35AK = CMF-SD35A-10
50AK = CMF-SD50A-10
2.00
(.079)
2.00
(.079)
YEAR CODE:
6 = 2006
Reduced Footprint and Height Option
2.60
(.102)
2.51
(.099)
Resistance Tolerance Option
Blank = Standard (20 ꢀ)
-10 = 10 ꢀ
5.00
(.197)
3.45
(.136)
F
Packaging Options
- 2 = Tape & Reel
7.60
5.95
G
H
(.299)
(.234)
*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.
10.0
(.394)
8.15
(.321)
CMF-SD Series - Telecom CPTC Resettable Fuses
Solder Reflow Recommendations
Preheating
Soldering
Cooling
300
250
200
150
100
50
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.
0
160–220
120
10–20
Time (seconds)
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. H, 10/07
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
CMF-SD25A-2
CMF-SD35A-2
CMF-SD50A-2
Tape Dimensions per EIA 481-2
24.0 +0.30/-0.10
16.0 0.10
(0.945 +0.012/-0.004 )
(0.630 0.004 )
W
4.00 0.10
(0.157 0.004)
4.00 0.10
(0.157 0.004)
P
0
16.0 0.10
(0.630 0.004)
12.0 0.10
(0.472 0.004)
P
1
2.00 0.10
(0.079 0.004)
2.00 0.10
(0.079 0.004)
P
2
10.2 0.10
(0.402 0.004)
8.35 0.10
(0.329 0.004)
A
0
9.0 0.10
(0.354 0.004)
8.30 0.10
(0.327 0.004)
B
0
1.5 +0.10/-0.0
(0.059 +0.004/-0.0)
1.5 +0.10/-0.0
(0.059 +0.004/-0.0)
D
0
11.5 0.10
(0.453 + 0.004)
7.5 0.10
(0.295 + 0.004)
F
1.75 0.10
(0.069 0.004)
1.75 0.10
(0.069 0.004)
E
1
0.50
(0.020)
0.50
(0.020)
T max.
1
11.0 0.10
(0.433 0.004)
8.80 0.10
(0.346 0.004)
K
0
D
CMF-SD25-2
P
P
E
T
2
0
CMF-SD35-2
CMF-SD50-2
F
W
330 -2/+0
(12.99 -.079/+0)
DIA.
B
0
P
A
K
0
0
16.4 +2.0/-0
(.646 +.079/-0)
13.2 +0.2/-0
MAX.
22.4
(.882)
5°
(.520 +.008/-0
100 1.5
(3.94 .059)
DIA.
0.50
(.020)
D
CMF-SD25A-2
CMF-SD35A-2
CMF-SD50A-2
P
2
P
E
0
D
1
F
330 -2/+0
(12.99 -.079/+0)
DIA.
W
B
0
P
K
1
A
0
16.4 +2.0/-0
(.646 +.079/-0)
MAX.
22.4
(.882)
20 °
8 °
K
0
13.2 +0.2/-0
(.520 +.008/-0
9.1
(.358)
100 1.5
(3.94 .059)
DIA.
MM
(INCHES)
UNIT =
4.5
(.177)
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
A
0
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