Datasheet

POLY-FUSE® Resettable PTCs
Axial Lead Battery Strap Type > ST Series
ST Series
RoHS
Description
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
• Low resistance
• Provides overcurrent
protection at 125°C trip
temperature
• Weldable Nickel terminals
Agency Approvals
Applications
AGENCY
• Rechargeable battery cell
protection
AGENCY FILE NUMBER
E183209
R50119583
Electrical Characteristics
Part Number
I hold
(A)
I trip
(A)
V max
(Vdc)
I max
(A)
Pd
max.
(W)
15ST175
1.75
3.8
15
100
2.5
Maximum Time
To Trip
Agency
Approvals
Resistance
Current
(A)
Time
(Sec.)
R min
(Ω)
R typ
(Ω)
R 1max
(Ω)
8.75
5.00
0.050
0.090
0.120
X
X
I hold = Hold current: maximum current device will pass without tripping in 20°C still air.
R typ = Typical resistance of device in initial (un-soldered) state.
I trip = Trip current: minimum current at which the device will trip in 20°C still air.
R 1max = Maximum resistance of device at 20°C measured one hour after tripping or reflow
soldering of 260°C for 20 sec.
V max = Maximum voltage device can withstand without damage at rated current (I max)
Caution: Operation beyond the specified rating may result in damage and possible arcing
and flame.
I max = Maximum fault current device can withstand without damage at rated voltage (Vmax)
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.
Temperature Rerating
Ambient Operation Temperature
-40°C
-20°C
0°C
20°C
Part Number
15ST175
40°C
50°C
60°C
70°C
85°C
1.30
1.20
1.10
0.90
Hold Current (A)
2.50
2.30
2.00
1.75
1.50
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.
© 2015 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/05/15
POLY-FUSE® Resettable PTCs
Axial Lead Battery Strap Type > ST Series
Temperature Rerating Curve
1.75 A
Average Time Current Curves
170%
Percentage of Rated Current
Time in Seconds
150%
ST
10
1
130%
110%
90%
70%
50%
30%
10%
-40 -30 -20
0.1
0.01
0.01
-10
0
10
20 30
40
Temperature (°C)
50
60
70
80
Note:
Typical Temperature rerating curve, refer to table for derating data
0.1
1
10
Physical Specifications
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.
Resources
0.13mm nominal thickness,
quarter-hard Nickel
Insulating Material
Polyester tape
Environmental Specifications
Additional Information
Datasheet
Lead Material
Samples
Operating/Storage
Temperature
Maximum Device Surface
Temperature in Tripped State
-40°C to +85°C
125°C
Passive Aging
+70°C, 1000 hours
-/+5% typical resistance change
Humidity Aging
+85°C, 85% R.H., 7 days,
-/+5% typical resistance change
Vibration
MIL–STD–883, Condition A,
No change
© 2015 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/05/15
POLY-FUSE® Resettable PTCs
Axial Lead Battery Strap Type > ST Series
Figure 1
Dimensions
Figure 2
(Items with S at end of part number)
SLIT
0.5 x 4.0 NOMINAL
(.02”x .15”)
A
A
Figure 1
Figure 2
(Items with
S at end of partBnumber)
E
B
SLIT
D1
A
D2
E
D1
Part
Number
15ST175
D1
A
C
B
E
0.5 x 4.0 NOMINAL
(.02”x .15”)
C
E
B
A
B
D2
Inches
D2
C
D1
mm
C
Inches
mm
Inches
D2
D1
mmC
D2
E
Inches
mm
Inches
mm
Inches
mm
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.
Min.
Min.
Min.
Min.
Min
Max. Min.
0.82
0.16
4.1
0.16
4.1
0.01
0.16
0.91
20.9
23.1
0.19
0.20
4.9
5.2
0.02
Top Side
0.04
0.6
1.0
3.9
Max.
4.1
Product Series
ST
Part Marking System
Part
Ordering
Number System
Current
Rating
175
XX9U
Top Side
ST
175
XX9U
15 ST 175 U
Littelfuse
Trademark
Product Series
Lot Number
(Contact Littelfuse
for additional
information)
QUANTITY CODE: U = 500 (bulk)
Current Rating
LEAD OPTIONS: Blank = standard
Littelfuse
Trademark
Lot Number
(Contact Littelfuse
for additional
information)
HOLD CURRENT
(Value divided by 100 = Hold Current in Amps)
SERIES
VOLTAGE RATING (VDC)
Packaging
Part
Number
Ordering
Number
I hold
(A)
I hold Code
Packaging
Option
Quantity
Quantity &
Packaging Codes
15ST175
15ST175U
1.75
175
Bulk
500
U
© 2015 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 11/05/15