POLY-FUSE
®
Resettable PTCs
Axial Lead Battery Strap Type > ST Series
ST Series
Description
RoHS
The new ST Series device provides reliable, noncycling
protection against overcharging and short circuits events
for rechargeable battery cells where resettable protection
is desired.
Features
• RoHS compliant and
lead–free
• Weldable Nickel terminals
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E183209
R50119583
• Low resistance
• Provides overcurrent
protection at 125°C trip
temperature
Applications
• Rechargeable battery cell
protection
Electrical Characteristics
P
d
max.
(W)
2.5
Maximum Time
To Trip
Current
(A)
8.75
Time
(Sec.)
5.00
R
min
(Ω)
0.050
Resistance
R
typ
(Ω)
0.090
R
1max
(Ω)
0.120
X
X
Part Number
I
hold
(A)
1.75
I
trip
(A)
3.8
V
max
(Vdc)
15
I
max
(A)
100
Agency
Approvals
15ST175
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
max
= Maximum voltage device can withstand without damage at rated current (I max)
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.
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 or reflow
soldering of 260°C for 20 sec.
Caution:
Operation beyond the specified rating may result in damage and possible arcing
and flame.
Temperature Rerating
Ambient Operation Temperature
-40°C
Part Number
15ST175
2.50
2.30
2.00
1.75
-20°C
0°C
20°C
40°C
Hold Current (A)
1.50
1.30
1.20
1.10
0.90
50°C
60°C
70°C
85°C
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.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/22/17
POLY-FUSE
®
Resettable PTCs
Axial Lead Battery Strap Type > ST Series
Average Time Current Curves
1.75 A
Temperature Rerating Curve
170%
Percentage of Rated Current
10
ST
150%
130%
110%
90%
70%
50%
30%
10%
-40 -30 -20
-10
0
10
20 30
40
Temperature (°C)
50
60
70
80
Time in Seconds
1
0.1
Note:
Typical Temperature rerating curve, refer to table for derating data
0.01
0.01
0.1
1
10
Physical Specifications
Lead Material
0.13mm nominal thickness,
quarter-hard Nickel
Polyester tape
Current in Amperes
The average time current curves and Temperature Rerating curve performance is affected
by a number or variables, and these curves provided as guidance only. Customer must
verify the performance in their application.
Insulating Material
Additional Information
Environmental Specifications
Operating/Storage
Temperature
Maximum Device Surface
Temperature in Tripped State
Passive Aging
-40°C to +85°C
125°C
+70°C, 1000 hours
-/+5% typical resistance change
+85°C, 85% R.H., 7 days,
-/+5% typical resistance change
MIL–STD–883, Condition A,
No change
Datasheet
Resources
Samples
Humidity Aging
Vibration
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/22/17
POLY-FUSE
®
Resettable PTCs
Axial Lead Battery Strap Type > ST Series
Dimensions
Figure 1
(Items with S at end of part number)
SLIT
0.5 x 4.0 NOMINAL
(.02”x .15”)
A
Figure 2
A
Figure 1
B
D1
D2
(Items with S at end of part
B
number)
E
0.5 x 4.0 NOMINAL
SLIT
(.02”x .15”)
C
Figure 2
E
A
A
D1
D2
C
E
B
E
D1
Part
Number
15ST175
A
Inches
0.82
0.91
D2
C
B
mm
23.1
Inches
0.19
D1
C
mm
4.9
5.2
Inches
0.02
D2
D1
mm
C
0.6
1.0
Inches
Min.
mm
Min.
D2
Inches
Min.
mm
Min.
E
Inches
Min
0.01
0.16
3.9
mm
Max.
4.1
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.
20.9
0.20
Max. Min.
Top Side
175
XX9U
0.04
0.16
4.1
0.16
4.1
Product Series
Part Marking System
Top Side
175
XX9U
Littelfuse
Trademark
Littelfuse
Trademark
Product Series
ST
Part Ordering Number System
Current Rating
Lot Number
(Contact Littelfuse
for additional
information)
15 ST 175 U
QUANTITY CODE:
U = 500 (bulk)
LEAD OPTIONS:
Blank = standard
ST
Current Rating
Lot Number
(Contact Littelfuse
for additional
information)
HOLD CURRENT
(Value divided by 100 = Hold Current in Amps)
SERIES
VOLTAGE RATING (VDC)
Packaging
Part
Number
15ST175
Ordering
Number
15ST175U
I
hold
(A)
1.75
I
hold
Code
175
Packaging
Option
Bulk
Quantity
500
Quantity &
Packaging Codes
U
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.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/22/17
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