PolySwitch®
PTC Devices
Overcurrent Protection Device
PRODUCT: TRF250-145-B-0.5
DOCUMENT: SCD26233
REV LETTER: F
REV DATE: JULY 26, 2016
PAGE NO.: 1 OF 2
Specification Status: Released
Operating Conditions at 20°C:
Maximum Continuous Operating Voltage
(V
MCO
): 60V
DC
Maximum Interrupt Current (I
INT
): 3A
RMS
Fault Ratings at 20°C:
250V
RMS
, 3A, 10 applications
Additional Info at 20°C:
Resistance matched: 0.5 Ohm
Lightning withstand: 1.5 kV per ITU-T K.20, K.21
Helps equipment meet ITU-T K.20, K.21 Recommendations
Helps equipment meet Telcordia GR1089 intrabuilding
requirements
Lead Material:
22 AWG Sn-Plated Copper (0.64 mm [0.025”] nominal diameter)
External Coating Material:
Cured, flame retardant epoxy polymer, meeting UL94 V-0
requirements
Marking:
TABLE I. DIMENSIONS:
A
MIN
MAX
MIN
mm:
--
6.5
--
in:
--
(0.26)
--
*Rounded off approximation
HOLD
TRIP
CURRENT CURRENT
(A)
(A)
B
MAX
11.0
(0.43)
MIN
--
--
C
MAX
4.6
(0.18)
MIN
4.7
(0.19)
D
MAX
--
--
E
NOM
5.0
(0.20)
F
MIN
--
--
MAX
7.0
(0.28)
TABLE II. PERFORMANCE RATINGS @ 20°C:
RESISTANCE (Ω)
TIME TO TRIP(Sec)
@ 1A
OPERATING
TEMPERATURE
(°C)
MIN
-40
MAX
85
TRIPPED
POWER
DISSIPATION
(W) @ 60V
DC
TYP
MAX
0.8
0.9
R MIN R MAX R
1 MAX
*
0.145
0.290
3.0
6.0
14.0
*Post Trip Resistance measured after one hour.
TYP
2.5
MAX
5.0
TABLE III. APPLICABLE PART DESCRIPTIONS:
PART DESCRIPTION
TRF250-145-B-0.5
PACKAGING TYPE
Bulk
NOTES
N/A
Agency Recognitions:
UL (File #E74889), CSA (File #78165C), TUV
Reference Documents:
PS300, ITU-T K.20, K.21
Precedence:
This specification takes precedence over documents referenced herein.
Effectivity:
Reference documents shall be the issue in effect on the date of invitation for bid.
CAUTION:Operation beyond the rated voltage or current may result in rupture, electrical arcing or flame.
Materials Information
ROHS Compliant
ELV Compliant
Pb-Free
© 2016 Littelfuse,Inc.
Specifications are subject to change without notice.
Revised July 26,2016
littelfuse.com
PolySwitch®
PTC Devices
Overcurrent Protection Device
PRODUCT: TRF250-145-B-0.5
DOCUMENT: SCD26233
REV LETTER: F
REV DATE: JULY 26, 2016
PAGE NO.: 2 OF 2
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 shall not be used for, any purpose (including, without limitation, military, aerospace, medical, lifesaving,
life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired
operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation
Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall
not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse
documentation The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse.
© 2016 Littelfuse,Inc.
Specifications are subject to change without notice.
Revised July 26,2016
littelfuse.com
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