Datasheet > 250R170-CF

250R170-CF

更新时间： 2025-09-19 19:43:35

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力特 - LITTELFUSE		/
页数	文件大小	规格书
5页	481K
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PTC自恢复保险丝Ih

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250R170-CF 数据手册

Resettable PPTC Datasheet

250R Series

Radial Leaded

RoHS

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

■ 0.08 – 0.18 hold current

range, 60VDC operating

voltage

■ Binned and sorted narrow

resistance ranges available

■ RoHS-compliant, Lead-Free

■ 250VAC interrupt rating

■ Fast time–to-trip

and Halogen-Free*

Additional Information

Applications

■ Customer Premises

Equipment (CPE)

■ LAN/WAN equipment

■ Access equipment

■ Central Ofﬁce (CO)/ telecom

centers

Resources

Accessories

Samples

Agency Approvals

Agency

Agency File Number

E183209

R50120008

Electrical Characteristics

MaximumTimeToTrip

Resistance

Agency Approvals

I _hold

(A)

I _trip

(A)

V_max

V_int/V_op

I _max

(A)

P _d

typ. (W)

Part Number

Current (A) Time (Sec.) R _min(Ω) R _typ(Ω) R _1max(Ω)

250R080

250R120

250R120-RA

250R120-RC

250R120-R2

250R145

0.08

0.12

0.145

0.18

0.16

0.24

0.29

0.65

250/60

0.35

4.0

2.5

3.0

2.5

5.4

7. 5

10.5

1.8

250R180

0.8

2.2

Note: Items with T at end of part number = pre-tripped device. See Part Ordering Number System section of this data sheet for additional information.

I _hold= Hold current: maximum current device will pass without tripping in 20°C still air.

I _trip= Trip current: minimum current at which the device will trip in 20°C still air.

V_int= Maximum voltage the device can withstand without damage at rated current (I max)

V_op= 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.

R _1max= Maximum resistance of device at 20°C measured one hour after tripping.

* Effective February 11, 2010 onward, all 600R PTC products will be manufactured Halogen Free (HF). Existing

Non-Halogen Free 600R PTC products may continue to be sold, until supplies are depleted. This change will

have no effect on 600R product speciﬁcations or performance.

I _max= Maximum fault current device can withstand without damage at rated voltage (V_max

)

P _d= Power dissipated from device when in the tripped state at 20°C still air.

Warning

• Users shall independently assess the suitability of these devices for each of their applications

• Operation of these devices beyond the stated maximum ratings could result in damage to the devices and lead to electrical arcing and/or ﬁre

• These devices are intended to protect against the effects of temporary over-current or over-temperature conditions and are not intended to perform as protective devices where such conditions are expected to be

repetitive or prolonged in duration

• Exposure to silicon-based oils, solvents, electrolytes, acids, and similar materials can adversely affect the performance of these PPTC devices

• These devices undergo thermal expansion under fault conditions, and thus shall be provided with adequate space and be protected against mechanical stresses

• Circuits with inductance may generate a voltage (L di/dt) above the rated voltage of the PPTC device.

Speciﬁcations are subject to change without notice.

Revised: GD. 05/07/21

12 3 4 5

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