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250R120U [LITTELFUSE]

POLY-FUSE Resettable PTCs; POLY- FUSE恢复PTC
250R120U
型号： 250R120U
厂家： LITTELFUSE    LITTELFUSE
描述：

POLY-FUSE Resettable PTCs
POLY- FUSE恢复PTC

电阻器 非线性电阻器 过载保护
文件： 总7页 (文件大小：619K)
中文：  中文翻译
下载：  下载PDF数据表文档文件
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Equipment (CPE)  
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telecom centers  
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POLY-FUSE® Resettable PTCs  
Radial Leaded > 250R Series  
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  
tꢀ  
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range, 60VDC operating  
voltage  
tꢀ  
tꢀ  
#JOOFEꢀBOEꢀTPSUFEꢀOBSSPXꢀ  
resistance ranges available  
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'SFFꢀBOEꢀ)BMPHFOꢇ'SFFꢉꢀ  
tꢀꢅꢆꢁ7"$ꢀJOUFSSVQUꢀSBUJOH  
tꢀ'BTUꢀUJNFoUPꢇUSJQ  
Agency Approvals  
AGENCY  
AGENCY FILE NUMBER  
E183209  
Applications  
R50120008  
Electrical Characteristics  
MaximumTime  
ToTrip  
Agency  
Resistance  
P d  
typ.  
(W)  
Vmax  
/ V  
Approvals  
I hold  
(A)  
I trip  
(A)  
I max  
(A)  
Part Number  
R min  
(Ω)  
R typ  
(Ω)  
R 1max  
(Ω)  
V
Current Time  
int  
op  
(A)  
0.35  
0.35  
1
(Sec.)  
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
250R080  
0.08  
0.08  
0.12  
0.12  
0.12  
0.12  
0.12  
0.12  
0.12  
0.12  
0.145  
0.145  
0.145  
0.145  
0.18  
0.18  
0.16  
0.16  
0.24  
0.24  
0.24  
0.24  
0.24  
0.24  
0.24  
0.24  
0.29  
0.29  
0.29  
0.29  
0.65  
0.65  
250/60  
250/60  
250/60  
250/60  
250/60  
250/60  
250/60  
250/60  
250/60  
250/60  
250/60  
250/60  
250/60  
250/60  
250/60  
250/60  
3
3
1
1
3
14  
15  
4
22  
22  
8
33  
33  
16  
16  
14  
16  
16  
16  
16  
16  
14  
12  
14  
14  
4
250R080T  
250R120  
3
3
1
1.5  
1.0  
0.85  
0.7  
0.8  
0.7  
1
250R120-RA  
250R120-RC  
250R120-RF  
250R120-R1  
250R120-R2  
250R120-R3  
250R120T  
3
1
1
7
9
3
1
1
5.4  
6
7.5  
10.5  
9
3
1
1
3
1
1
6
3
1
1
8
10.5  
10  
12  
6
3
1
1
8
3
1
1
1.2  
2.5  
5
7
250R145  
3
1
1
3
250R145-RA  
250R145-RB  
250R145T  
3
1
1
3
5.5  
6
3
1
1
2.5  
2.0  
21  
4.5  
5.4  
0.8  
1.4  
3
1
1
7.5  
2.2  
3.9  
250R180  
10  
10  
1.8  
1.8  
1
250R180T  
1
20  
4.5  
Items withT at end of part number = pre-tripped device. See Part Ordering Number System section of this data sheet for additional information.  
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I tripꢀꢍꢀ5SJQꢀDVSSFOUꢎꢀNJOJNVNꢀDVSSFOUꢀBUꢀXIJDIꢀUIFꢀEFWJDFꢀXJMMꢀUSJQꢀJOꢀꢅꢏ¡$ꢀTUJMMꢀBJSꢂ  
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Vop= The device regular operation voltage  
R min = Minimum resistance of device in initial (un-soldered) state.  
R typ =Typical resistance of device in initial (un-soldered) state.  
Caution: Operation beyond the specified rating may result in damage and possible arcing  
and flame.  
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)
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97  
© 2011 Littelfuse, Inc  
250R Series  
Specifications are subject to change without notice.  
Please refer to www.littelfuse.com/series/250R.html for current information.  
Revised: August 31, 2011  
POLY-FUSE® Resettable PTCs  
Radial Leaded > 250R Series  
Temperature Rerating  
Ambient OperationTemperature  
ꢇꢐꢁ¡$  
ꢇꢅꢁ¡$  
ꢁ¡$  
ꢅꢏ¡$  
ꢐꢁ¡$  
ꢆꢁ¡$  
ꢑꢁ¡$  
ꢒꢁ¡$  
ꢃꢆ¡$  
Part Number  
250R080  
Hold Current (A)  
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  
0.06  
0.06  
0.10  
0.10  
0.12  
0.12  
0.16  
0.16  
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  
250R120T  
250R145  
250R145T  
250R180  
250R180T  
AverageTime Current Curves  
Temperature Rerating Curve  
170%  
150%  
130%  
250R  
100000  
10000  
1000  
110%  
90%  
70%  
50%  
30%  
10%  
100  
-40 -30 -20 -10  
0
10  
20 30  
40 50 60 70 80  
Temperature (°C)  
10  
1
0.1  
0.01  
0.1  
1
10  
100  
Current in Amperes  
The average time current curves andTemperature 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.  
98  
© 2011 Littelfuse, Inc.  
Specifications are subject to change without notice.  
Please refer to www.littelfuse.com/series/250R.html for current information.  
250R Series  
Revised: August 31, 2011  
POLY-FUSE® Resettable PTCs  
Radial Leaded > 250R Series  
Agency Specification Selection Guide ForTelecom and Networking Applications  
Product  
Lightning  
Power Cross  
250R120  
250R145  
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*56ꢀ,ꢂꢅꢁꢌꢅꢄꢌꢐꢆꢀoꢀꢐL7ꢀꢄꢁꢌꢒꢁꢁçTꢉ  
5FMDPSEJBꢀ(3ꢀoꢀꢓꢒꢐꢀoꢀꢄꢂꢁL7ꢀꢄꢁꢌꢄꢁꢁꢁçT  
*56ꢀ,ꢂꢅꢁꢌꢅꢄꢌꢐꢆꢀoꢀꢅꢏꢁ7BDꢈꢀꢄꢁû  
*56ꢀ,ꢂꢅꢁꢌꢅꢄꢌꢐꢆꢀoꢀꢑꢁꢁ7BDꢈꢀꢑꢁꢁû  
*56ꢀ,ꢂꢅꢁꢌꢅꢄꢌꢐꢆꢀoꢀꢅꢏꢁ7BDꢈꢀꢄꢁû  
*56ꢀ,ꢂꢅꢁꢌꢅꢄꢌꢐꢆꢀoꢀꢑꢁꢁ7BDꢈꢀꢑꢁꢁû  
5FMDPSEJBꢀ(3ꢀoꢀꢓꢒꢐꢇꢀꢅꢃꢏ7BDꢈꢀꢄꢁ"  
250R180  
ꢉ%FWJDFTꢀTIPVMEꢀCFꢀJOEFQFOEFOUMZꢀFWBMVBUFEꢀBOEꢀUFTUFEꢀGPSꢀVTFꢀJOꢀBOZꢀTQFDJmDꢀBQQMJDBUJPOꢀ  
Protection Application Guide  
Region/Specification  
Application  
Device Selection  
250R180  
ꢉ"DDFTTꢀOFUXPSLꢀFRVJQNFOU  
Remote terminal  
Repeaters  
250R180T  
250R145  
250R145T  
250R120  
South America/Asia/Europe  
ITU K.45  
ꢀꢀ8"/ꢀFRVJQNFOU  
ꢀꢀ$SPTTꢀoDPOOFDU  
250R120T  
Customer and IT equipment  
Analog modems  
250R180  
250R180T  
250R145  
South America/Asia/Europe  
ITU K.21  
"%4-ꢈꢀY%4-  
Phone sets, PBX systems  
Internet appliances  
POS terminals  
250R145T  
250R120  
250R120T  
250R180  
250R180T  
250R145  
250R145T  
250R120  
250R120T  
Central Office  
POTS/ISDN linecards  
5ꢄꢌ&ꢄꢌ+ꢄꢀMJOFDBSET  
"%4-ꢌ7%4-ꢀTQMJUUFST  
CSU/DSU  
South America/Asia/Europe  
ITU K.20  
250R180  
250R180T  
250R145  
250R145T  
250R120  
250R120T  
North AmericaTelcordia  
GR-974  
ꢉ1SJNBSZꢀQSPUFDUJPOꢀNPEVMFT  
MDF modules  
South America/Asia/Europe  
ITU K.20  
Network interface  
250R180  
250R180T  
250R145  
250R145T  
250R120  
250R120T  
North AmericaTelcordia  
GR-1089  
ꢉ*OUSBCVJMEJOHꢀDPNNVOJDBUJPOꢀTZTUFNT  
ꢀꢀ-"/ꢈꢀ70*1ꢀDBSET  
ꢀꢀ-PDBMꢀMPPQꢀIBOETFUT  
South America/Asia/Europe  
ITU K.20 and K.21  
-"/ꢀ*OUSBCVJMEJOHꢀQPXFSꢀDSPTT  
Protection  
250R080  
ꢀꢀ-"/ꢀFRVJQNFOUꢈꢀ*1ꢀQIPOF  
ꢉ3FTJTUBODFꢀCJOOFEꢀQBSUTꢀBSFꢀSFDPNNFOEFE  
99  
© 2011 Littelfuse, Inc  
250R Series  
Specifications are subject to change without notice.  
Please refer to www.littelfuse.com/series/250R.html for current information.  
Revised: August 31, 2011  
        
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side of the board.  
        
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tꢀ5IJTꢀQSPmMFꢀDBOꢀCFꢀVTFEꢀGPSꢀMFBEꢇGSFFꢀEFWJDF  
        
Note:ꢀ  
           
*GꢀTPMEFSJOHꢀUFNQFSBUVSFTꢀFYDFFEꢀUIFꢀSFDPNNFOEFEꢀ  
profile, devices may not meet the performance  
requirements.  
tꢀ  
tꢀ  
tꢀ  
        
3FDPNNFOEFEꢀTPMEFSJOHꢀNFUIPETꢎꢀIFBUꢀFMFNFOUꢀPWFOꢀPSꢀ  
N2 environment for lead-free.  
POLY-FUSE® Resettable PTCs  
Radial Leaded > 250R Series  
Soldering Parameters -Wave Soldering  
Condition  
8BWFꢀ4PMEFSJOH  
<
PeakTemp/ DurationTime  
ꢅꢑꢁ¡$ꢀ 5 Sec  
Soldering  
Cooling  
>
260  
220  
220°C  
2 Sec ~ 20 Sec  
Preheat 140°C ~ 180°C  
Storage Condition  
180 Sec ~ 210 Sec  
<
ꢁ¡$_ꢏꢆ¡$ꢀ ꢀꢒꢁꢕ3)  
Preheating  
190  
160  
0
2 to 5  
20-30  
180 to 210  
and solvents.  
Time(s)  
Environmental Specifications  
Operating/Storage  
Physical Specifications  
ꢇꢐꢁ¡$ꢀUPꢀꢔꢃꢆ¡$  
Lead Material  
Tin-plated Copper  
Temperature  
Maximum Device Surface  
Temperature inTripped State  
Soldering  
Characteristics  
4PMEFSBCJMJUZꢀQFSꢀ.*-o45%oꢅꢁꢅꢈ  
Method 208E  
ꢄꢅꢆ¡$  
$VSFEꢈꢀnBNFꢀSFUBSEBOUꢀFQPYZꢀQPMZNFSꢀ  
NFFUTꢀ6-ꢓꢐ7ꢇꢁꢀSFRVJSFNFOUTꢂꢀ  
Passive Aging  
ꢑꢆ¡$ꢌꢃꢆ¡$ꢈꢀꢄꢁꢁꢁꢀIPVST  
Insulating Material  
Device Labeling  
.BSLFEꢀXJUIꢀh-'hꢈꢀWPMUBHFꢈꢀDVSSFOUꢀSBUJOHꢈꢀ  
and date code.  
Humidity Aging  
ꢔꢃꢆ¡$ꢈꢀꢃꢆꢕꢀ3ꢂ)ꢈꢂꢄꢁꢁꢁꢀIPVST  
.*-o45%oꢅꢁꢅ ꢈꢀ.FUIPEꢀꢄꢁꢒ(  
ꢔꢄꢅꢆ¡$ꢀUPꢀꢇꢆꢆ¡$ꢀꢄꢁꢀUJNFT  
Thermal Shock  
Solvent Resistance  
.*-o45%oꢅꢁꢅꢈꢀ.FUIPEꢀꢅꢄꢆ'  
-FWFMꢀꢄꢈꢀ+o45%oꢁꢅꢁ$  
Moisture Sesitivity Level  
100  
Revised: August 31, 2011  
© 2011 Littelfuse, Inc.  
250R Series  
Specifications are subject to change without notice.  
Please refer to www.littelfuse.com/series/250R.html for current information.  
POLY-FUSE® Resettable PTCs  
Radial Leaded > 250R Series  
Dimensions  
Part Marking System  
C
A
A
C
Littelfuse  
Trademark  
Littelfuse  
Voltage Rating  
250  
Voltage Rating  
Current Rating  
Date Code  
250  
120  
XXXX  
Trademark  
080  
Current Rating  
Date Code  
XXXX  
(Contact Littelfuse  
for additional  
information)  
(Contact Littelfuse  
for additional  
information)  
B
B
D
D
F
F
E
E
Figure 1  
Figure 2  
A
B
C
D
E
Physical Characteristics  
Inches mm Inches mm Inches mm Inches mm Inches mm  
Max. Max. Max. Max. Max. Max.  
Lead (dia)  
Material  
Part Number 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  
250R080T  
250R120  
1
1
2
2
2
2
2
2
2
2
2
2
2
2
1
1
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  
250R120-RA  
250R120-RC  
250R120-RF  
250R120-R1  
250R120-R2  
250R120-R3  
250R120T  
250R145  
250R145-RA  
250R145-RB  
250R145T  
250R180  
250R180T  
101  
Revised: August 31, 2011  
© 2011 Littelfuse, Inc  
250R Series  
Specifications are subject to change without notice.  
Please refer to www.littelfuse.com/series/250R.html for current information.  
POLY-FUSE® Resettable PTCs  
Radial Leaded > 250R Series  
Part Ordering Number System  
250 R 120 - RA Z R  
PACKAGING STYLE  
BLANK: Bulk  
R: Tape & Ammo  
QUANTITY CODE: F=200 M=1000 U=500 Z=1200  
Rx: Resistance Range (x = A-Z or 1-9) [not applicable for all parts]  
T: PRE-TRIPPED DEVICE (OPTIONAL)  
SERIES  
I HOLD CURRENT CODE (Refer to Packaging or Electrical Characteristics tables)  
R: RADIAL  
PEAK VOLTAGE RATING  
Packaging  
I hold  
(A)  
Ordering  
Number  
I hold  
Code  
Packaging  
Option  
Quantity &  
Packaging Codes  
Part Number  
250R080  
Quantity  
250R080U  
250R080ZR  
Bulk  
Tape and Ammo  
Bulk  
500  
1200  
500  
U
ZR  
U
0.080  
0.080  
0.120  
0.120  
0.120  
0.120  
0.120  
0.120  
0.120  
0.120  
0.145  
0.145  
0.145  
080  
080  
120  
120  
120  
120  
120  
120  
120  
120  
145  
145  
145  
250R080TU  
250R080T  
250R080TZR  
250R120U  
Tape and Ammo  
Bulk  
1200  
500  
ZR  
U
250R120  
250R120ZR  
Tape and Ammo  
Bulk  
1200  
500  
ZR  
U
250R120-RAU  
250R120-RAZR  
250R120-RCU  
250R120-RCZR  
250R120-RFU  
250R120-RFZR  
250R120-R1U  
250R120-R1ZR  
250R120-R2U  
250R120-R2ZR  
250R120-R3U  
250R120-R3ZR  
250R120TU  
250R120-RA  
250R120-RC  
250R120-RF  
250R120-R1  
250R120-R2  
250R120-R3  
250R120T  
Tape and Ammo  
Bulk  
1200  
500  
ZR  
U
Tape and Ammo  
Bulk  
1200  
500  
ZR  
U
Tape and Ammo  
Bulk  
1200  
500  
ZR  
U
Tape and Ammo  
Bulk  
1200  
500  
ZR  
U
Tape and Ammo  
Bulk  
1200  
500  
ZR  
U
Tape and Ammo  
Bulk  
1200  
500  
ZR  
U
250R120TZR  
250R145U  
Tape and Ammo  
Bulk  
1200  
500  
ZR  
U
250R145  
250R145ZR  
Tape and Ammo  
Bulk  
1200  
500  
ZR  
U
250R145-RAU  
250R145-RAZR  
250R145-RBU  
250R145-RA  
250R145-RB  
Tape and Ammo  
Bulk  
1200  
500  
ZR  
U
250R145-RBZR  
250R145TU  
250R145TZR  
250R180F  
Tape and Ammo  
Bulk  
1200  
500  
ZR  
U
250R145T  
250R180  
250R180T  
0.145  
0.180  
0.180  
145  
180  
180  
Tape and Ammo  
Bulk  
1200  
200  
ZR  
F
250R180MR  
Tape and Ammo  
1000  
MR  
250R180TF  
Bulk  
200  
F
250R180TMR  
Tape and Ammo  
1000  
MR  
102  
© 2011 Littelfuse, Inc.  
250R Series  
Specifications are subject to change without notice.  
Please refer to www.littelfuse.com/series/250R.html for current information.  
Revised: August 31, 2011  
POLY-FUSE® Resettable PTCs  
Radial Leaded > 250R Series  
Tape and Ammo Specifications  
Devices taped using EIA468-B/IE286-2 standards. See table below and Figure 1 for details.  
Dimensions  
Dim. (mm)  
Dimension  
EIA Mark  
IEC Mark  
Tol. (mm)  
oꢁꢂꢆꢀꢌꢀꢔꢄꢂꢁ  
min.  
Carrier tape width  
)PMEꢀEPXOꢀUBQFꢀXJEUI  
W
W4  
W6  
W5  
D0  
H
W
W0  
W2  
W1  
D0  
H
18  
11  
Top distance between tape edges  
Sprocket hole position  
3
NBYꢂ  
9
4
oꢁꢂꢆꢀꢌꢀꢔꢁꢂꢒꢆ  
oꢁꢂꢏꢅꢀꢌꢀꢔꢁꢂꢅ  
oꢌꢔꢀꢏꢂꢁ  
oꢌꢔꢀꢁꢂꢆ  
NBYꢂ  
4QSPDLFUꢀIPMFꢀEJBNFUFSꢉ  
Abscissa to plane (straight lead)  
Abscissa to plane (kinked lead)  
Abscissa to top  
18.5  
16  
H0  
H1  
C1  
C2  
L1  
H0  
H1  
32.2  
42.5  
43.2  
1.0  
Overall width without lead protrusion  
Overall width with lead protrusion  
-FBEꢀQSPUSVTJPO  
NBYꢂ  
NBYꢂ  
l1  
L
NBYꢂ  
Protrusion of cut out  
L
11  
NBYꢂ  
1SPUSVTJPOꢀCFZPOEꢀIPMEoEPXOꢀUBQF  
4QSPDLFUꢀIPMFꢀQJUDIꢎꢀꢅꢆꢁ3ꢁꢃꢁoꢅꢆꢁ3ꢄꢐꢆ  
4QSPDLFUꢀIPMFꢀQJUDIꢎꢀꢅꢆꢁ3ꢄꢃꢁ  
l2  
l2  
Not specified  
12.7  
25.4  
P0  
P0  
P0  
P0  
oꢌꢔꢀꢁꢂꢏ  
oꢌꢔꢀꢁꢂꢆ  
20  
Pitch tolerance  
oꢌꢔꢀꢄ  
consecutive.  
%FWJDFꢀQJUDIꢎꢀꢅꢆꢁ3ꢁꢃꢁoꢅꢆꢁ3ꢄꢐꢆ  
%FWJDFꢀQJUDIꢎꢀꢅꢆꢁ3ꢄꢃꢁ  
12.7  
25.4  
0.9  
2.0  
0
Tape thickness  
t
t
NBYꢂ  
NBYꢂ  
Tape thickness with splice  
Splice sprocket hole alignment  
Body lateral deviation  
t1  
oꢌꢔꢀꢁꢂꢏ  
oꢌꢔꢀꢄꢂꢁ  
oꢌꢔꢀꢄꢂꢏ  
Δh  
Δp  
Δh  
Δp  
0
Body tape plane deviation  
0SEJOBUFꢀUPꢀBEKBDFOUꢀDPNQPOFOUꢀMFBEꢉ  
0
P1  
F
P1  
F
3.81  
5.1  
oꢌꢔꢀꢁꢂꢒ  
oꢌꢔꢀꢁꢂꢒ  
-FBEꢀTQBDJOH  
ꢉ%JGGFSTꢀGSPNꢀ&*"ꢀ4QFDJGJDBUJPO  
Tape and Ammo Diagram  
Δh  
Δh  
Δh  
Δp  
Figure 1  
Reference plane  
A1  
H1  
C1  
H C2  
H1  
F
H0  
A
B
L
W5  
W4  
W
I2  
P0  
D0  
Direction of unreeling  
Cross section A - B  
L1  
t
103  
© 2011 Littelfuse, Inc  
250R Series  
Specifications are subject to change without notice.  
Please refer to www.littelfuse.com/series/250R.html for current information.  
Revised: August 31, 2011  

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