cmfrd

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
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