TR250-145U Tyco Electronics, TR250-145U Datasheet - Page 7

• Manufacturer Part Number: TR250-145U
• Description: POLYSWITCH 0.145A HOLD UNENCAPS
• Manufacturer: Tyco Electronics
• Series: PolySwitch®r

Specifications of TR250-145U

• R Min/max: 3.500 ~ 6.500 Ohm
• Voltage - Max: 60V
• Time To Trip: 2s
• Current - Hold (ih) (max): 145mA
• Current - Trip (it): 290mA
• Current - Max: 3A
• Package / Case: Radial
• Holding Current: 0.145A
• Tripping Current: 0.29A
• Initial Resistance Max: 6.5ohm
• Initial Resistance Min: 3.5ohm
• Resistance R1: 12ohm
• Peak Reflow Compatible (260 C): No
• Fuse Terminals: Radial Leaded
• Thermistor Type: PTC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: TR145U

Raychem Circuit Protection
Table T2. Thermal Derating for Telecommunications and Networking Devices [Hold Current (A) at Ambient
Temperature (°C)] continued
Part Number
Surface—60 V
SMD, midSMD
SMD030*
SMD030-2018*
SMD050-2018*
Surface—60 V
miniSMD
miniSMDC014*
miniSMDC014F*
Notes:
*Product is not currently available in a resistance matched or sorted option.
Figure T1. Thermal Derating [Hold Current (A) at Ambient Temperature (°C)]
A = TC250-180
B = All other TC, TGC, TCF,
TR
series devices
X
,
TRF
X
, TS
X
, TSM
Maximum Ambient Temperature
-40˚C
0.44
0.48
0.86
0.23
0.23
X
-20˚C
0.39
0.42
0.77
0.20
0.20
For thermal derating of BBR and RXE series devices, see radial-leaded product section on pages 217-
252. For SMD, midSMD, miniSMDC series, see surface-mount product section on page 187 of this
Raychem Circuit Protection Databook.
0˚C
0.32
0.35
0.70
0.17
0.17
Figure T1. Thermal Derating Curve (Normalized)
PolySwitch Telecommunications and Networking Resettable Devices
20˚C
0.30
0.30
0.55
0.14
0.14
40˚C
0.26
0.24
0.48
0.11
0.11
Telecommunications and Networking
50˚C
0.23
0.21
0.43
0.10
0.10
60˚C
0.19
0.17
0.38
0.09
0.09
70˚C
0.18
0.15
0.36
0.07
0.07
85˚C
0.15
0.10
0.26
0.05
0.05
307
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