THERMISTOR PPTC Resettable Fuse For Customer Premise Equipment , Access Equipment
Quick Detail:
■ Radial leaded devices
■ Fast tripping resettable PTCs
■ Binned and sorted narrow resistance ranges available
Description:
UCHI'S resettable PPTCs is ideally suited for protecting applications sensitive to high ambient operating temperatures orsubject to frequent overcurrent conditions.PPTCs operate as a positive temperature coefficient device. High temperatures and excessive current will cause the device resistance to increase until it limits the unsafe current level.Upon reaching the design temperature/current limit, the PPTC will effectively“open” the circuit to provide protection from the overcurrent or elevated ambient temperature condition.Once the fault is removed or the ambient temperature cools, the PPTC will automatically “reset” and conduct safe current levels again, allowing current to flow through the circuit.PPTCs are commonly used in applications where constant uptime is required and/or in circuits not easily accessible by a user or service technician.Available in surface mount and radial packages, Cooper Bussmann resettable PPTCs help improve the safety and reliability of customer equipment worldwide.
Applications:
■ Customer Premise Equipment (CPE)
■ Central Offi ce / Telecom Centers (CO)
■ Access equipment
Specifications:
Product Dimensions in Millimeter
| Part Number | A | B | C | D | E | Lead |
| Max | Max | Max | Min | Typ. | Style | Size(Φ) |
| LT250-020 | 7.4 | 12.7 | 4.5 | 7.6 | 5.1 | 1 | CP 0.5 |
| LT250-040 | 5.8 | 9.9 | 4.5 | 7.6 | 5.1 | 1 | |
| LT250-055 | 5.8 | 9.9 | 4.6 | 4.7 | 5.1 | 1 | 0.6 |
| LT250-080 | 5.8 | 9.9 | 4.6 | 4.7 | 5.1 | 1 | 0.6 |
| LT250-080U | 4.8 | 9.3 | 3.8 | 4.7 | 5.1 | 1 | 0.6 |
| LT250-110 | 6.5 | 11.0 | 4.6 | 4.7 | 5.1 | 2 | 0.6 |
| LT250-110U | 6.0 | 10.0 | 3.8 | 4.7 | 5.1 | 2 | 0.6 |
| LT250-120 | 6.5 | 11.0 | 4.6 | 4.7 | 5.1 | 2 | 0.6 |
| LT250-120U | 6.0 | 10.0 | 3.8 | 4.7 | 5.1 | 2 | 0.6 |
| LT250-145 | 6.5 | 11.0 | 4.6 | 4.7 | 5.1 | 2 | 0.6 |
| LT250-145U | 6.0 | 10.0 | 3.8 | 4.7 | 5.1 | 2 | 0.6 |
| LT250-180 | 11.0 | 13.6 | 4.6 | 4.7 | 5.1 | 2 | 0.6 |
| LT250-180U | 10.4 | 12.6 | 3.8 | 4.7 | 5.1 | 2 | 0.6 |
Electrical Characteristics at 25 ℃
| Part Number | Ih(mA) | Vmax(V) | Imax(A) | Rmax(Ω) | Rmin(Ω) | Pdtyp(W) |
| LT250-060 | 60 | 250 | 3 | 45.0 | 20.0 | 1.0 |
| LT250-080 | 80 | 250 | 3 | 22.0 | 10.0 | 1.0 |
| LT250-090 | 90 | 250 | 3 | 20.0 | 7.0 | 1.0 |
| LT250-110 | 110 | 250 | 3 | 12.0 | 6.0 | 1.0 |
| LT250-120 | 120 | 250 | 3 | 10.5 | 6.0 | 1.0 |
| LT250-145 | 145 | 250 | 3 | 6.5 | 3.5 | 1.0 |
| LT250-180 | 180 | 250 | 10 | 3.0 | 1.0 | 1.0 |
| LT250-200 | 200 | 250 | 10 | 6.0 | 3.0 | 1.0 |
| LT250-400 | 400 | 250 | 10 | 3.0 | 1.0 | 1.0 |
| LT250-600 | 600 | 250 | 10 | 2.0 | 0.6 | 1.0 |
| LT250-800 | 800 | 250 | 10 | 1.0 | 0.4 | 1.0 |
| LT250-030 | 30 | 250 | 1 | 90.0 | 35.0 | 1.0 |
| LT250-040 | 40 | 250 | 3 | 65.0 | 27.0 | 1.0 |
IH=Hold current: maximum current at which the device will not trip at 25℃ still air.
IT=Trip current: minimum current at which the device will always trip at 25℃ still air.
Vmax=Maximum voltage device can withstand without damage at rated current.
Imax=Maximum fault current device can withstand without damage at rated voltage.
Ttrip=Maximum time to trip(s) at assigned current.
Pdtyp=Typical power dissipation: typical amount of power dissipated by the device when in state air environment.
Rmin=Minimum device resistance at 25℃ prior to tripping.
Rmax=Maximum device resistance at 25℃ prior to tripping.
Thermal Derating [ Hold Current (A) at Ambient Temperature (℃)]
| Part Number | Maximum Ambient Operating Temperature (℃) |
| -40 | -20 | 0 | 25 | 40 | 50 | 60 | 70 | 85 |
| LT250-080 | 0.124 | 0.110 | 0.095 | 0.080 | 0.066 | 0.059 | 0.051 | 0.044 | 0.033 |
| LT250-080U | 0.124 | 0.110 | 0.095 | 0.080 | 0.066 | 0.059 | 0.051 | 0.044 | 0.033 |
| LT250-110 | 0.171 | 0.151 | 0.131 | 0.110 | 0.091 | 0.081 | 0.071 | 0.061 | 0.046 |
| LT250-110U | 0.171 | 0.151 | 0.131 | 0.110 | 0.091 | 0.081 | 0.071 | 0.061 | 0.046 |
| LT250-120 | 0.191 | 0.170 | 0.148 | 0.120 | 0.104 | 0.093 | 0.082 | 0.071 | 0.055 |
| LT250-120U | 0.191 | 0.170 | 0.148 | 0.120 | 0.104 | 0.093 | 0.082 | 0.071 | 0.055 |
| LT250-145 | 0.225 | 0.199 | 0.172 | 0.145 | 0.119 | 0.106 | 0.093 | 0.080 | 0.060 |
| LT250-145U | 0.225 | 0.199 | 0.172 | 0.145 | 0.119 | 0.106 | 0.093 | 0.080 | 0.060 |
| LT250-180 | 0.269 | 0.240 | 0.211 | 0.180 | 0.153 | 0.138 | 0.123 | 0.109 | 0.087 |
| LT250-180U | 0.269 | 0.240 | 0.211 | 0.180 | 0.153 | 0.138 | 0.123 | 0.109 | 0.087 |
Reliability Test
| Test | Test Conditions | Accept/Reject Criteria |
| Resistance | In still air @ 25℃ | Rmin≤R≤Rmax |
| Time to Trip | Specified current, Vmax, 25℃ | T≤maximum Time to Trip |
| Hold Current | 30min, at IH | No trip |
| Trip Cycle Life | Vmax, Imax, 100cycles | No arcing or burning |
| Trip Endurance | Vmax, 24hours | No arcing or burning |
Typical Time-to-Trip Curves at 25 ℃
A = LT250-020/080U
B = LT250-110/0110U
C = LT250-120/120U
D = LT250-145/145U
E = LT250-180/180U
Package Information
Bulk:
LT250-020 ~ LT250-040……………….1000 pcs per bag
LT250-055 ~ LT250-180………………. 500 pcs per bag
Competitive Advantage:
- Factory supply directly
- Completed certificates such as UL,VDE,SGS,etc and high quality available
- Quick delivery
- Best after-sales services
- OEM & ODM available
Product Tags:
|
|
THERMISTOR PPTC Resettable Fuse For Customer Premise Equipment , Access Equipment Images
|
