250R145 [LITTELFUSE]
POLYFUSE Resettable PTCs Radial Leaded; POLYFUSE恢复PTC径向引线
| 型号： | 250R145 |
| 厂家： | 
LITTELFUSE |
| 描述： | POLYFUSE Resettable PTCs Radial Leaded |
| 文件： | 总6页 (文件大小：383K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
POLYFUSE® Resettable PTCs
Radial Leaded
250R Series
Description
• The 250R series is designed to protect against short
duration high voltage fault currents (power cross or
power induction surge) typically found in telecom
applications (250Vrms). The series can be used to help
telecom networking equipment meet the protection
requirements specified in ITU K.20 and K.21.
Features
• RoHS compliant and
lead-free
• Fast time-to-trip
• 0.08 – 0.18 Hold current
range, 60VDC operating
voltage
Agency Approvals
• Binned and sorted narrow
resistance ranges available
• 250VAC interrupt rating
AGENCY
AGENCY FILE NUMBER
E183209
Applications
R50082521
• Customer Premises
Equipment (CPE)
• LAN/WAN Equipment
• Access equipment
• Central Office (CO)/
Telecom Centers
Electrical Characteristics
Maximum Time
Agency
Resistance
R typ
P
Vmax
/ V
To Trip
Approvals
madx.
(W)
I hold
(A)
I trip
(A)
I max
(A)
Part Number
R min
(Ω)
R 1max
(Ω)
V
Current
Time
int
op
(A)
0.35
0.35
1
(Sec.)
(Ω)
22
22
8
250R080T
250R080
0.08
0.08
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.145
0.145
0.145
0.145
0.18
0.18
0.16
0.16
0.24
0.24
0.24
0.24
0.24
0.24
0.24
0.24
0.29
0.29
0.29
0.29
0.65
0.65
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
3
3
1
1
3
3
15
14
4
33
33
16
16
14
16
16
16
16
16
14
12
14
14
4
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
250R120
3
1
1.5
1.0
0.85
0.7
0.8
0.7
1
250R120-RA
250R120-RC
250R120-RF
250R120-R1
250R120-R2
250R120-R3
250R120T
250R145
3
1
1
7
9
3
1
1
5.4
6
7.5
10.5
9
3
1
1
3
1
1
6
3
1
1
8
10.5
10
12
6
3
1
1
8
3
1
1
1.2
2.5
5
7
3
1
1
3
250R145-RA
250R145-RB
250R145T
250R180
3
1
1
3
5.5
6
3
1
1
2.5
2.0
21
4.5
5.4
0.8
1.4
3
1
1
7.5
2.2
3.9
10
10
1.8
1.8
1
250R180T
1
20
4.5
*typical value
C: coated device
T: pre-tripped device
250R Series
ꢀ
www.littelfuse.com
©2006 Littelfuse
Specifications are subject to change without notice.
Electronics Designers Guide
POLYFUSE® Resettable PTCs
Radial Leaded
Temperature Rerating
Ambient Operation Temperature
-40°C
-20°C
0°C
23°C
40°C
Hold Current (A)
0.06
50°C
60°C
70°C
85°C
Part Number
250R080
0.12
0.12
0.18
0.18
0.26
0.26
0.28
0.28
0.11
0.11
0.16
0.16
0.20
0.20
0.23
0.23
0.09
0.09
0.14
0.14
0.17
0.17
0.21
0.21
0.08
0.08
0.12
0.12
0.145
0.145
0.18
0.18
0.05
0.05
0.09
0.09
0.11
0.11
0.13
0.13
0.05
0.05
0.08
0.08
0.09
0.09
0.10
0.10
0.04
0.04
0.06
0.06
0.08
0.08
0.11
0.11
0.03
0.03
0.05
0.05
0.06
0.06
0.083
0.083
250R080T
250R120
0.06
0.10
0.10
0.12
0.12
0.16
0.16
250R120T
250R145
250R145T
250R180
250R180T
Average Time Current Curves
Temperature Rerating Curve
170%
150%
130%
100000
10000
1000
100
110%
90%
70%
50%
30%
10%
-40 -30 -20 -10
0
10
20 30
Temperature (°C)
40 50 60 70 80
10
1
0.100
0.010
0.001
0.02
0.100
1
10
100
CURRENT IN AMPERES
Specifications are subject to change without notice.
Note: 1.00 means the number one with two decimal places.
AKL V3.9 06.05.18
The average time current curves and temperature rerating curve performance is affected
by a number or variables, and these curves provided as guidance only. Customer must
verify the performance in their application.
250R Series
2
www.littelfuse.com
©2006 Littelfuse
Specifications are subject to change without notice.
Electronics Designers Guide
POLYFUSE® Resettable PTCs
Radial Leaded
Agency Specification Selection Guide For Telecom and Networking Applications
Product
Power Cross
Lightning
250R120
250R145
ITU K.20/21/45 – 1.5kV 10/700μs
ITU K.20/21/45 – 4kV 10/700μs*
ITU K.20/21/45 – 230Vac, 10Ω
ITU K.20/21/45 – 600Vac, 600Ω
ITU K.20/21/45 – 1.5kV 10/700μs
ITU K.20/21/45 – 4kV 10/700μs*
Telcordia GR – 974 – 1.0kV 10/1000μs
ITU K.20/21/45 – 230Vac, 10Ω
ITU K.20/21/45 – 600Vac, 600Ω
Telcordia GR – 974- 283Vac, 10A
250R180
*Devices should be independently evaluated and tested for use in any specific application
Protection Application Guide
Region/Specification
Application
Device Selection
250R180
250R180T
250R145
250R145T
250R120
250R120T
*Access network equipment
Remote terminal
Repeaters
South America/Asia/Europe
ITU K.45
WAN equipment
Cross –connect
Customer and IT equipment
Analog modems
250R180
250R180T
250R145
250R145T
250R120
250R120T
South America/Asia/Europe
ITU K.21
ADSL, xDSL
Phone sets, PBX systems
Internet appliances
POS terminals
250R180
250R180T
250R145
250R145T
250R120
250R120T
Central Office
POTS/ISDN linecards
T1/E1/J1 linecards
ADSL/VDSL splitters
CSU/DSU
South America/Asia/Europe
ITU K.20
North America
Telcordia GR-974
250R180
250R180T
250R145
250R145T
250R120
250R120T
*Primary protection modules
MDF modules
South America/Asia/Europe
ITU K.20
Network interface
250R180
250R180T
250R145
250R145T
250R120
250R120T
North America
Telcordia GR-1089
*Intrabuilding communication systems
LAN, VOIP cards
Local loop handsets
South America/Asia/Europe
ITU K.20 and K.21
LAN Intrabuilding power cross
Protection
250R080
LAN equipment, IP phone
*Resistance binned parts are recommended
250R Series
ꢁ
www.littelfuse.com
©2006 Littelfuse
Specifications are subject to change without notice.
Electronics Designers Guide
POLYFUSE® Resettable PTCs
Radial Leaded
Soldering Parameters - Wave Soldering
Condition
Wave Soldering
<
Peak Temp/ Duration Time
260°C 5 Sec
Soldering
Cooling
260
220
>
220°C
2 Sec ~ 20 Sec
Preheat 140°C ~ 180°C
Storage Condition
180 Sec ~ 210 Sec
Preheating
<
0°C~35°C 70%RH
190
160
• Recommended soldering methods: heat element oven or
N2 environment for lead-free.
• Devices are designed to be wave soldered to the bottom
side of the board.
0
2 to 5
20-30
180 to 210
Time(s)
• Devices can be cleaned using standard industry methods
and solvents.
• This profile can be used for lead-free device
Note: If soldering temperatures exceed the recommended
profile, devices may not meet the performance
requirements.
Soldering Parameters - Solder Reflow
Condition
Reflow
>
Peak Temp/ Duration Time
260°C 5 Sec
30 Sec ~ 60 Sec
60 Sec ~ 90 Sec
Soldering
Cooling
260
220
>
220°C
Preheat 160°C ~ 190°C
Storage Condition
Preheating
<
0°C~35°C, 70%RH
190
160
• Recommended reflow methods: IR, vapor phase oven, hot
air oven, N2 environment for lead-free.
• Devices are not designed to be wave soldered to the
bottom side of the board.
0
30 to 60
120
60 to 90
Time(s)
• 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.
Physical Specifications
Environmental Specifications
Operating/Storage
Lead Material
Tin-plated copper
-40°C to +85°C
Temperature
Soldering
Characteristics
Solderability per MIL-STD-202,
Method 208E
Maximum Device Surface
Temperature in Tripped State
125°C
Cured, flame retardant epoxy polymer
meets UL94V-0 requirements.
Insulating Material
Device Labeling
Passive Aging
65°C/85°C, 1000 hours
+85°C, 85%R.H. 1000 hours
Marked with LF, voltage, current rating,
and date code.
Humidity Aging
MIL-STD-202F Method 107G
+125°C to -55°C 10 times
Thermal Shock
Solvent Resistance
MIL-STD-202, Method 215F
250R Series
ꢂ
www.littelfuse.com
©2006 Littelfuse
Specifications are subject to change without notice.
Electronics Designers Guide
POLYFUSE® Resettable PTCs
Radial Leaded
Dimensions
C
A
C
A
Marking
Marking
B
B
D
D
F
F
E
E
Figure ꢀ
Figure 2
A
B
C
D
E
Physical Characteristics
Lead (dia)
Part Number Inches mm Inches mm Inches mm Inches mm Inches mm
Max. Max. Max. Max. Max. Max.
Material Figure
Min.
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
0.19
Min.
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
Typ.
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
Typ.
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
5.1
Inches
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
0.026
mm
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
250R080
0.23
0.23
0.26
0.26
0.26
0.26
0.26
0.26
0.26
0.26
0.26
0.26
0.26
0.26
0.37
0.37
5.8
5.8
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
9.5
9.5
0.39
0.39
0.43
0.43
0.43
0.43
0.43
0.43
0.43
0.43
0.43
0.43
0.43
0.43
0.47
0.47
9.9
9.9
11
11
11
11
11
11
11
11
11
11
11
11
12
12
0.18
0.18
0.15
0.18
0.18
0.18
0.18
0.18
0.18
0.18
0.18
0.18
0.18
0.18
0.18
0.18
4.6
4.6
3.8
4.6
4.6
4.6
4.6
4.6
4.6
4.6
4.6
4.6
4.6
4.6
4.6
4.6
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
Sn/Cu
1
1
2
2
2
2
2
2
2
2
2
2
2
2
1
1
250R080T
250R120
250R120-RA
250R120-RC
250R120-RF
250R120-R1
250R120-R2
250R120-R3
250R120T
250R145
250R145-RA
250R145-RB
250R145T
250R180
250F180T
Part Marking System
Littelfuse
Trademark
Littelfuse
Trademark
Voltage Rating
Current Rating
Date Code
Voltage Rating
Current Rating
Date Code
250
250
080
XXXX
120
XXXX
(Contact Littelfuse
for additional
information)
(Contact Littelfuse
for additional
information)
250R Series
5
www.littelfuse.com
©2006 Littelfuse
Specifications are subject to change without notice.
Electronics Designers Guide
POLYFUSE® Resettable PTCs
Radial Leaded
Part Numbering System
250 R 120 - RA Z R
PACKAGING STYLE
BLANK: Bulk
R: Tape & Ammo
QUANTITY CODE: M=1000 U=500 Z=1200
SERIES
Rx: Resistance Range (x = A-Z or 1-9) [not applicable for all parts]
T: PRE-TRIPPED DEVICE (OPTIONAL)
I HOLD CURRENT CODE (SEE TABLE BELOW)
R: RADIAL
PEAK VOLTAGE RATING
Packaging
I hold
(A)
I hold
Code
Packaging
Option
Quantity &
Packaging Codes
Quantity
Bulk
Tape and Ammo
Bulk
500
1500
500
U
DR
U
0.080
0.120
0.145
0.180
080
120
145
180
Tape and Ammo
Bulk
1200
500
ZR
U
Tape and Ammo
Bulk
1200
200
ZR
F
Tape and Ammo
1000
MR
250R Series
ꢃ
www.littelfuse.com
©2006 Littelfuse
Specifications are subject to change without notice.
Electronics Designers Guide
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