PolySwitch® Resettable PPTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/04/19
Telecom > Radial Leaded > TR Series
TR Series
Description
Our PolySwitch families of telecommunications and
networking devices help meet the growing demand for
resettable overcurrent protection. These product families
help provide protection against damage caused by power
cross and power induction surges as defined in ITU,
Telcordia GR1089 and IEC 62368-1. Our offering includes
chip, surface-mount and radial-leaded configurations.
Applications
Networking Machines and Systems
• Modems
• Phone sets
• Fax machines
• Phone wall outlets
• Alarm systems
• PBX systems
• MDF modules
• T1/E1 equipment
• Analog and digital line cards
• xDSL modems and splitters
• Powered Ethernet systems
• VoIP (Voice over Internet
Protocol) equipment
• LAN, WAN equipment
• Customer premise equipment
• Access network hardware
Electrical Characteristics
Part
Number IHIT
VMAX IMAX
PD Typ
Max Time-to-trip
RMIN RMAX R1MAX
Agency ApprovalsOperating Interrupt Interrupt
(A) (A) (VDC) (VRMS) (A) (W) (A) (s) (Ω) (Ω) (Ω)
TRF250 – Radial-leaded*— 250VAC
TRF250-055T 0.055 0.170 60 250 3.0 0.6 0.28 3.5 15.0 25.0 35.0 — — —
TRF250-055UT 0.055 0.170 60 250 3.0 0.6 0.28 3.0 15.0 25.0 35.0 — — —
TRF250-080T 0.080 0.160 60 250 3.0 0.6 0.35 4.0 15.0 22.0 33.0 x x x
TRF250-080U 0.080 0.160 60 250 3.0 0.6 0.35 2.5 14.0 20.0 33.0 x x x
TRF250-110U 0.110 0.220 60 250 3.0 0.6 1.00 0.8 5.0 9.0 16.0 x x x
TRF250-120 0.120 0.240 60 250 3.0 0.8 1. 0 0 1. 5 4.0 8.0 16.0 x x x
TRF250-120T 0.120 0.240 60 250 3.0 0.8 1. 0 0 0.7 7. 0 12.0 16.0 — — —
Features
• Resettable overcurrent protection
• Fast time-to-trip
• Resistance sorted and matched devices available
• Low parasitic capacitance/flat impedance with frequency
• Recognized to UL 1434, approved to CSA TIL No. CA-3A
and EN 60730-1.
Agency Approvals
AGENCY AGENCY FILE/CERTIFICATE NUMBER
E74889*
78166*
72161787*
* See Electrical Characteristic Table for approved part numbers.
RoHS
Additional Information
Datasheet Resources Samples
PolySwitch® Resettable PTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/04/19
Telecom > Radial Leaded > TR Series
Electrical Characteristics
Part
Number IHIT
VMAX IMAX
PD Typ
Max Time-to-trip
RMIN RMAX R1MAX
Agency ApprovalsOperating Interrupt Interrupt
(A) (A) (VDC) (VRMS) (A) (W) (A) (s) (Ω) (Ω) (Ω)
TRF250 – Radial-leaded*— 250VAC
TRF250-120T-RA 0.120 0.240 60 250 3.0 0.8 1. 0 0 1. 2 7. 0 9.0 16.0 — — —
TRF250-120T-RC 0.130 0.260 60 250 3.0 0.8 1. 0 0 3.0 5.4 7. 5 14.0 — — —
TRF250-120T-RF 0.120 0.240 60 250 3.0 0.8 1. 0 0 0.9 6.0 10.5 16.0 — — —
TRF250-120T-RH 0.120 0.240 60 250 3.0 0.8 1. 0 0 0.7 9.0 11. 0 16.0 — — —
TRF250-120T-R1 0.120 0.240 60 250 3.0 0.8 1. 0 0 0.7 6.0 9.0 16.0 — — —
TRF250-120T-R2 0.120 0.240 60 250 3.0 0.8 1. 0 0 0.8 8.0 10.5 16.0 — — —
TRF250-120U 0.120 0.240 60 250 3.0 0.7 1. 0 0 1. 0 6.0 10.0 16.0 x x x
TRF250-120UT 0.120 0.240 60 250 3.0 0.7 1. 0 0 0.7 7. 0 12.0 16.0 — — —
TRF250-145 0.145 0.290 60 250 3.0 0.8 1. 0 0 2.5 3.0 6.0 14.0 x x x
TRF250-145-RA 0.145 0.290 60 250 3.0 0.8 1. 0 0 2.5 3.0 6.0 12.0 — — —
TRF250-145T 0.145 0.290 60 250 3.0 0.8 1. 0 0 1. 5 5.4 7. 5 14.0 — — —
TRF250-145U 0.145 0.290 60 250 3.0 0.7 1. 0 0 2.0 3.5 6.5 14.0 x x x
TRF250-180 0.180 0.650 100 250 10.0 0.9 3.00 0.5 0.8 2.2 4.0 x x x
TRF250-183‡0.183 0.685 100 250 10.0 0.9 3.00 0.6 0.8 2.0 3.4 x x x
TRF250-183U‡0.183 0.685 100 250 10.0 0.9 3.00 0.6 0.8 2.0 3.4 x x x
TRF250-184‡0.184 1.000 100 250 10.0 0.9 3.00 0.5 1. 2 2.4 3.1 x x x
TRF600 – Radial-leaded†— 600VAC
TRF600-150 0.150 0.300 250 600 3.0 1. 4 1. 0 1. 4 6.0 10.0 1 7. 0 x x x
TRF600-150-RB 0.150 0.300 250 600 3.0 1. 4 1. 0 1. 0 9.0 12.0 22.0 — — —
TRF600-150-R2 0.150 0.300 250 600 3.0 1. 4 1. 0 1. 3 7. 0 10.0 1 7. 0 — — —
TR600-150F-EX 0.150 0.300 250 600 3.0 1.4 1.0 5.0 6.0 12.0 22.0 — — —
TR600-150F-EX-RB 0.150 0.300 250 600 3.0 1.4 1.0 5.0 9.0 12.0 22.0 — — —
TRF600-160 0.160 0.320 250 600 3.0 1. 7 1. 0 7. 5 4.0 10.0 18.0 x x x
TRF600-160-RA 0.160 0.320 250 600 3.0 1. 7 1. 0 9.5 4.0 7. 0 16.0 — — —
TRF600-250 0.250 0.850 250 600 3.0 2.0 3.0 1.0 1. 0 4.3 7. 0 x x x
TRF600-400 0.400 1.000 60 600 3.0 2.4 3.0 4.0 0.95 1.45 1.90 x x x
Notes:
IH : Hold current: maximum current device will pass without interruption in 20°C still air.
IT : Trip current: minimum current that will switch the device from low resistance to high resistance in 20°C still air.
VMAX Operating
: Maximum continuous voltage device can withstand without damage at rated current. This voltage is used for component Recognition under UL1434.
VMAX Interrupt
:
Maximum voltage that can be safely placed across a device in its tripped state.
IMAX Interrupt
: Maximum fault current device can withstand without damage at rated operating voltage. This current is used for component Recognition under UL1434. Devices may trip
safely under higher level power cross conditions to assist equipment in meeting the appropriate ITU, UL60950 or GR1089 industry requirements.
PD : Power dissipated from device when in the tripped state in 20°C still air.
RMIN : Minimum resistance of device as supplied at 20°C unless otherwise specified.
RMAX : Maximum resistance of device as supplied at 20°C unless otherwise specified.
R1MAX : Maximum resistance measured one hour post-trip or post-reflow at 20°C.
* 250VAC interrupt products may help equipment pass ITU K.20, K.21 and K.45 recommendations and Telcordia GR-1089 Port Type 2 and 4 requirements.
† 600VAC interrupt products may help equipment pass UL60950, TIA-968-A and GR1089 Port Type 1, 3 and 5 requirements.
‡ Product is not currently available in a resistance matched or sorted option.
PolySwitch® Resettable PPTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/04/19
Telecom > Radial Leaded > TR Series
Temperature Rerating
Maximum Ambient Temperature
Part Number -40°C -20°C 0°C 20°C 40°C 50°C 60°C 70°C 85°C
Hold Current (A)
TRF250 – Radial-leaded — 250VAC
TRF250-055T 0.085 0.076 0.065 0.055 0.045 0.041 0.035 0.030 0.023
TRF250-055UT 0.085 0.076 0.065 0.055 0.045 0.041 0.035 0.030 0.023
TRF250-080T 0.124 0.110 0.095 0.080 0.066 0.059 0.051 0.044 0.033
TRF250-080U 0.124 0.110 0.095 0.080 0.066 0.059 0.051 0.044 0.033
TRF250-110U 0.171 0.151 0.131 0.110 0.091 0.081 0.071 0.061 0.046
TRF250-120 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050
TRF250-120T 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050
TRF250-120U 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050
TRF250-120UT 0.186 0.165 0.143 0.120 0.099 0.088 0.077 0.066 0.050
TRF250-145 0.225 0.199 0.172 0.145 0.119 0.106 0.093 0.080 0.060
TRF250-145T 0.225 0.199 0.172 0.145 0.119 0.106 0.093 0.080 0.060
TRF250-145U 0.225 0.199 0.172 0.145 0.119 0.106 0.093 0.080 0.060
TRF250-180 0.279 0.247 0.213 0.180 0.147 0.131 0.115 0.099 0.074
TRF250-183‡0.284 0.251 0.217 0.183 0.149 0.133 0.117 0.101 0.075
TRF250-183U‡0.284 0.251 0.217 0.183 0.149 0.133 0.117 0.101 0.075
TRF250-184‡0.286 0.252 0.218 0.184 0.150 0.134 0.118 0.102 0.075
TRF600 – Radial-leaded†— 600VAC
TRF600-150 0.239 0.209 0.180 0.150 0.121 0.107 0.093 0.079 0.057
TR600-150F-EX 0.239 0.209 0.180 0.150 0.121 0.107 0.093 0.079 0.057
TRF600-160 0.255 0.223 0.192 0.160 0.129 0.114 0.099 0.084 0.061
TRF600-250 0.400 0.350 0.300 0.250 0.198 0.170 0.140 0.117 0.083
TRF600-400 0.640 0.560 0.480 0.400 0.320 0.270 0.230 0.190 0.130
% of Rated Hold and Trip Current
Device’s Ambient Temperature (˚C)
200
150
100
50
0-40 -20 020406080
Temperature Rerating Curve
† 600VAC interrupt products may help equipment pass UL60950, TIA-968-A and GR1089 Port Type 1, 3 and 5 requirements.
‡ Product is not currently available in a resistance matched or sorted option.
PolySwitch® Resettable PTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/04/19
Telecom > Radial Leaded > TR Series
Typical Time-to-Trip Curves at 25°C
TRF250
A = TRF250-180/183/183U/184
B = TRF250-145/145U/145T
C = TRF250-120/120U
D = TRF250-110U/120UT/120T
E = TRF250-080T/080U
F = TRF250-055T/055UT
TRF600
A = TRF600-400
B = TRF600-250
C = TRF600-160
D = TR600-150F-EX
E = TRF600-150
Time–to–Trip (s)
Fault Current (A)
1000
100
10
1
0.1
0.01
0.000.20 0.40 0.60 0.801.001.201.401.601.80 2.002.20 2.40 2.60 2.80 3.00
A
B
C
D
E
F
A
B
C
D
E
F
Time–to–Trip (s)
Fault Current (A)
1000
100
10
1
0.1
0.01 012345
67
E
C
B
A
D
E
A
B
C
D
PolySwitch® Resettable PPTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/04/19
Telecom > Radial Leaded > TR Series
TRF250/ TRF600 – Physical Specifications
Lead Material Tin-plated Copper, 22AWG
Insulating Material Cured Epoxy Polymer
Soldering Characteristics ANSI/J-STD-002, Category 3
Solder Heat Withstand IEC 60068-2-20, Test Tb, Section 5 Method 1
Note: Devices are not intended to be placed through a reflow process.
TRF250/ TRF600 – Environmental Specifications
Test Conditions
Passive Aging
60°C, 1000 hrs
85°C, 1000 hrs
Humidity Aging 85°C, 85% R.H., 1000 hrs
Thermal Shock 125°C, -55°C (10 Times)
Solvent Resistance MIL-STD-202, Method 215F
Moisture Resistance Level Level 1, J-STD-020
Storage Conditions 40°C max, 70% RH max; devices should remain in original sealed bags prior to use.
Devices may not meet specified values if these storage conditions are exceeded.
Note: Storage conditions: 40°C (max), 70% RH (max), devices should remain in original sealed bag prior to use.
Devices may not meet specified values if these storage conditions are exceeded.
TRF*250 -120 T -RA -B-0.5 -2
Packaging
2 = Tape and Reel
0.130 = Special Lead Length in Inches
(Blank) = Bulk
B-x.x = Resistance Matched in Bins of x.xΩ (Optional)
Rx = Resistance Range (Optional)
Modifier (Optional)
U = Uncoated
S = Straight Lead
T = Fast Trip Device
Hold Current (mA)
Product Series (TRF250, TRF600)
* F = RoHS compliant, ELV compliant
Part Ordering Number System
PolySwitch® Resettable PTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/04/19
Telecom > Radial Leaded > TR Series
Dimensions and Weights
Part Number
Dimensions in Millimeters (Inches)
Figure Device Mass (g)
(Only for Reference)
A B C D E F
Min Max Min Max Min Max Min Max Min Max Min Max
TRF250 – Radial-leaded*— 250VAC
TRF250-055T —5.8 —9.9 —4.6 4.7 —5.0‡
— — — 1 0.28
(0.23) (0.39) (0.18) (0.19) (0.20)
TRF250-055UT —4.8 —9.3 —3.8 4.7 —5.0‡ — — — 4 0.13
(0.19) (0.37) (0.15) (0.19) (0.20)
TRF250-080T —5.8 —9.9 —4.6 4.7 —5.0‡
— — — 1 0.28
(0.23) (0.39) (0.18) (0.19) (0.20)
TRF250-080U —4.8 —9.3 —3.8 4.7 —5.0‡
— — — 4 0.13
(0.19) (0.37) (0.15) (0.19) (0.20)
TRF250-110U —5.3 —9.4 —3.8 4.7 —5.0‡ — — — 4 0.13
(0.21) (0.37) (0.15) (0.19) (0.20)
TRF250-120 —6.5 —11.0 —4.6 4.7 —5.0‡
— — — 2 0.38
(0.26) (0.43) (0.18) (0.19) (0.20)
TRF250-120T —6.5 —11.0 —4.6 4.7 —5.0‡
— — 7.0 20.38
(0.26) (0.43) (0.18) (0.19) (0.20) (0.28)
TRF250-120U —6.0 —10.0 —3.8 4.7 —5.0‡ — — 6.0 30.19
(0.24) (0.39) (0.15) (0.19) (0.20) (0.24)
TRF250-120UT —6.0 —10.0 —3.8 4.7 —5.0‡
— — 6.0 30.19
(0.24) (0.39) (0.15) (0.19) (0.20) (0.24)
TRF250-145 —6.5 —11.0 —4.6 4.7 —5.0‡
— — 7.0 20.38
(0.26) (0.43) (0.18) (0.19) (0.20) (0.28)
TRF250-145T —6.5 —11.0 —4.6 4.7 —5.0‡ — — 7.0 20.38
(0.26) (0.43) (0.18) (0.19) (0.20) (0.28)
TRF250-145U —6.0 —10.0 —3.8 4.7 —5.0‡
— — 6.0 30.19
(0.24) (0.39) (0.15) (0.19) (0.20) (0.24)
TRF250-180 —9.0 —12.0 —3.8 4.7 —5.0‡
— — — 1 0.35
(0.35) (0.47) (0.15) (0.19) (0.20)
TRF250-183 —7.5 —10.5 —3.8 4.7 —5.0‡
— — — 1 0.30
(0.29) (0.41) (0.15) (0.19) (0.20)
TRF250-183U —6.5 —10.0 —3.0 4.7 —5.0‡
— — — 4 0.16
(0.26) (0.39) (0.12) (0.19) (0.20)
TRF250-184 —7.7 —10.5 —4.6 4.7 —5.0‡
— — — 1 0.32
(0.30) (0.41) (0.18) (0.19) (0.20)
Figure 2 Figure 3 Figure 4Figure 1
Dimension Figures
* 250VAC interrupt products may help equipment pass ITU K.20, K.21 and K.45 recommendations and Telcordia GR-1089 Port Type 2 and 4 requirements.
‡ Indicates dimension is typical, not minimum.
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A
A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A
A
A
C
C
C
C
E
Cto
LC
L
E
Cto
L
C
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
PolySwitch® Resettable PPTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/04/19
Telecom > Radial Leaded > TR Series
Dimensions and Weights
Part Number
Dimensions in Millimeters (Inches)
Figure Device Mass (g)
(Only for Reference)
A B C D E F
Min Max Min Max Min Max Min Max Min Max Min Max
TRF600 – Radial-leaded — 600VAC
TRF600-150 —9.0 —12.5 —4.6 4.7 —5.0 — — 9.0 10.37
(0.35) (0.49) (0.18) (0.19) (0.20) (0.35)
TR600-150F-EX —13.5 —12.6 —6.0 4.7 —5.0 — — — 2 0.80
(0.53) (0.50) (0.18) (0.19) (0.20)
TRF600-160 —16.0 —12.6 —6.0 4.7 —5.0‡
— — 10.0 20.90
(0.63) (0.50) (0.24) (0.19) (0.20) (0.39)
TRF600-250 —15.0 —14.5 —4.6 4.7 —5.0‡ — — 10.0 10.87
(0.59) (0.57) (0.18) (0.19) (0.20) (0.39)
TRF600-400 —14.8 —13.1 —4.6 6.0 —5.0‡
— — — 2 0.85
(0.58) (0.52) (0.18) (0.27) (0.20)
Figure 2Figure 1
Dimension Figures
Wave Soldering Recommendations
Recommended Wave Soldering
• Soldering temperature profile
Temperature characteristic at component terminal with dual
wave soldering
Rework
• If a device is removed from the board, it should be discarded
and replaced with a new device
‡ Indicates dimension is typical, not minimum.
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
CB
B
C
C
B
B
B
D
B
D
B
D
B
C
E
E
E
G
E
A
D
D
F
D
A
A
D D
C
B
D
C
B
D
A
E
Cto
LC
L
A
E
Cto
LC
L
D
D
E
F
A
A
B
A
C
C
E
F
A A A
C
C
C C
E
Cto
LC
L
E
Cto
LC
L
E
Cto
LC
L
D
B
A
E
Cto
LC
L
300
250
200
150
100
50
0050
10s
245˚C ... 260˚C
100˚C ... 130˚C
Forced cooling
100150 200 250
Temperature (˚C)
Time (s)
PolySwitch® Resettable PTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/04/19
Telecom > Radial Leaded > TR Series
Packaging and Marking Information
Part
Number
Bag
Quantity
Tape and Reel
Quantity
Standard Package
Quantity
Part
Marking
Agency
Approvals
TRF250 – Radial-leaded — 250VAC
TRF250-055T 500 — 10,000 — —
TRF250-055UT 500 — 10,000 — —
TRF250-080U 500 — 10,000 — UL, CSA, TÜV
TRF250-080T 500 — 10,000 08F UL, CSA, TÜV
TRF250-110U 500 — 10,000 — UL, CSA, TÜV
TRF250-120 500 — 10,000 20F UL, CSA, TÜV
TRF250-120-2 — 1,500 7,500 20F UL, CSA, TÜV
TRF250-120T 500 — 10,000 20F —
TRF250-120T-2 — 1,500 7,500 20F —
TRF250-120U 500 — 10,000 20F UL, CSA, TÜV
TRF250-120U-2 — 1,500 7,500 20F UL, CSA, TÜV
TRF250-120UT 500 — 10,000 20F —
TRF250-145 500 — 10,000 45F UL, CSA, TÜV
TRF250-145-2 — 1,500 7,500 45F UL, CSA, TÜV
TRF250-145T 500 — 10,000 45F —
TRF250-145T-2 — 1,500 7,500 45F —
TRF250-145U 500 — 10,000 45F UL, CSA, TÜV
TRF250-145U-2 — 1,500 7,500 45F UL, CSA, TÜV
TRF250-180 500 — 10,000 80F UL, CSA, TÜV
TRF250-180-2 — 1500 7,500 80F UL, CSA, TÜV
TRF250-183 500 — 10,000 83F UL, CSA, TÜV
TRF250-183-2 — 1,500 7,500 83F UL, CSA, TÜV
TRF250-183U 500 — 10,000 — UL, CSA, TÜV
TRF250-184 500 — 10,000 84F UL, CSA, TÜV
TRF600 – Radial-leaded — 600VAC
TRF600-150 500 — 10,000 150F UL, CSA, TÜV
TRF600-150-2 — 1,500 7,500 150F UL, CSA, TÜV
TR600-150F-EX 500 — 10,000 150F —
TR600-150F-EX-2 — 600 3,000 150F —
TRF600-160 500 — 10,000 160F UL, CSA, TÜV
TRF600-160-2 — 600 3,000 160F UL, CSA, TÜV
TRF600-250 500 — 10,000 250F UL, CSA, TÜV
TRF600-400 500 — 10,000 400F UL, CSA, TÜV
PolySwitch® Resettable PPTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/04/19
Telecom > Radial Leaded > TR Series
Tape and Reel Specifications
TRF250/TRF600 devices are available in tape and reel packaging per EIA 468-B standard.
See Figures 1 and 2 for details.
Description EIA Mark IEC Mark Dimension (mm) Tolerance
Carrier Tape Width W W 18 -0.5/+1.0
Hold Down Tape Width W4W05 Min
Top Distance between Tape Edges W6W23 Max
Sprocket Hole Position W5W19 -0.5/+0.75
Sprocket Hole Diameter D0D04 ±0.2
Abcissa to Plane (Straight Lead) H H 18.5 ±3.0
Abcissa to Plane (Kinked Lead)* H0H016 -0.5/+0.6
Abcissa to Top H1H132.2 Max
Overall Width with Lead Protrusion — C143.2 Max
Overall Width without Lead Protrusion — C242.5 Max
Lead Protrusion L1I11. 0 Max
Protrusion of Cut-out L L 11 Max
Protrusion beyond Hold Down Tape I2I2Not Specified —
Sprocket Hole Pitch P0P012.7 ±0.3
Device Pitch (TRF250 and TRF600-150) — — 12.7 —
Device Pitch (TRF600-160 - TRF600-400) — — 25.4 —
Pitch Tolerance — — 20 Consecutive ±1
Tape Thickness t t 0.9 Max
Tape Thickness with Splice* t1— 2.0 Max
Splice Sprocket Hole Alignment — — 0 ±0.3
Body Lateral Deviation Dh Dh 0 ±1.0
Body Tape Plane Deviation Dp Dp 0 ±1.3
Lead Spacing Plane Deviation DP1P10 ±0.7
Lead Spacing* F F 5.08 ±0.6
Reel Width w2w 56 Max
Reel Diameter a d 370 Max
Space between Flanges Less Device w1— 4.75 ±3.25
Arbor Hole Diameter c f 26 ±12.0
Core Diameter n h 80 Max
Box — — 56/372/372 Max
Consecutive Missing Pieces* — — 3 Max —
Empty Places per Reel* — — Not Specified —
* Differs from EIA specification.
PolySwitch® Resettable PTCs
© 2019 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/04/19
Telecom > Radial Leaded > TR Series
Tape and Reel Diagrams
Figure 1
Figure 2
h
H1P1
W4
H0
H1
C1
C2
F
AB
Reference Plane
Direction of Unreeling
Cross section A-B
W5
H
W
t
P0D0
I2
L
L1
hpp
w1
n
a
c
w2
Cross Section
Direction of
Unreeling
Reel
Tape
Upper Side
Lower Side
Optional Shape: Circular or Polygonal
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each
product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications.
Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.
WARNING
• Users should independently evaluate the suitability of and test each product selected for their own application.
• Operation beyond the maximum ratings or improper use may result in device damage and possible electrical arcing and flame.
• These devices are intended for protection against damage caused by occasional overcurrent or overtemperature fault conditions and should not be used when
repeated fault conditions or prolonged trip events are anticipated.
• Contamination of the PPTC material with certain silicone-based oils or some aggressive solvents can adversely impact the performance of the devices.
• Device performance can be impacted negatively if devices are handled in a manner inconsistent with recommended electronic, thermal, and mechanical
procedures for electronic components.
• PPTC devices are not recommended for installation in applications where the device is constrained such that its PTC properties are inhibited, for example in rigid
potting materials or in rigid housings, which lack adequate clearance to accommodate device expansion.
• Operation in circuits with a large inductance can generate a circuit voltage (Ldi/dt) above the rated voltage of the device.
