POLYFUSE
®
Resettable PTCs
Axial Leaded Strap
ST Series
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
• Weldable nickel terminals
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E183209
R50082521
• Low resistance
• Provides overcurrent
protection at 125°C trip
temperature
Applications
• Rechargeable battery cell
protection
Electrical Characteristics
I
hold
(A)
1.2
1.2
1.75
1.75
I
trip
(A)
2.7
2.7
3.8
3.8
V
max
(Vdc)
15
15
15
15
I
max
(A)
100
100
100
100
P
d
max.
(W)
1.2
1.2
2.5
2.5
Maximum Time
To Trip
Current
(A)
6.00
6.00
8.75
8.75
Time
(Sec.)
5.00
5.00
5.00
5.00
R
min
(Ω)
0.085
0.085
0.050
0.050
Resistance
R
typ
(Ω)
0.160
0.160
0.090
0.090
R
1max
(Ω)
0.220
0.220
0.120
0.120
X
X
X
X
X
X
X
X
Agency
Approvals
Part Number
15ST120
15ST120S
15ST175
15ST175S
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.
ST Series
Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com
©2006 Littelfuse
POLYFUSE
®
Resettable PTCs
Axial Leaded Strap
Temperature Rerating
Ambient Operation Temperature
-40°C
Part Number
15ST120
15ST120S
15ST175
15ST175S
1.90
1.90
2.50
2.50
1.70
1.70
2.30
2.30
1.50
1.50
2.00
2.00
1.20
1.20
1.75
1.75
-20°C
0°C
23°C
40°C
Hold Current (A)
1.00
1.00
1.50
1.50
0.90
0.90
1.30
1.30
0.80
0.80
1.20
1.20
0.70
0.70
1.10
1.10
0.50
0.50
0.90
0.90
50°C
60°C
70°C
85°C
Average Time Current Curves
Temperature Rerating Curve
170%
150%
Percentage of Rated Current
130%
110%
90%
70%
50%
30%
10%
-40 -30 -20
-10
0
10
20 30
40
Temperature (°C)
50
60
70
80
A:
15ST120/15ST120S
B:
15ST175/15ST175S
C:
D:
E:
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.
ST Series
Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com
©2006 Littelfuse
POLYFUSE
®
Resettable PTCs
Axial Leaded Strap
Physical Specifications
Lead Material
0.13mm nominal thickness,
quarter-hard nickel
Environmental Specifications
Operating/Storage
Temperature
Maximum Device Surface
Temperature in Tripped State
Passive Aging
Humidity Aging
Vibration
-40°C to +85°C
125°C
+70°C, 1000 hours
±5% typical resistance change
+85°C, 85%R.H. 7days
±5% typical resistance change
MIL-STD-883C, Condition A
No change
Insulating Material
Polyester tape
Dimensions
Figure 1
SLIT
A
Figure 2
0.5 x 4.0 NOMINAL
(.02”x .15”)
A
B
Marking
D1
D2
E
B
Marking
D1
D2
E
Figure 1
A
Inches
Figure 2
SLIT
C
C
B
Marking
15ST120
D1
Part
Number
A
B
mm
Inches
0.5 x 4.0 NOMINAL
(.02”x .15”)
A
C
mm
D1
D2
Inches
Min
0.01
0.01
0.01
0.01
E
mm
Fig.
mm
Inches
Inches mm Inches mm
Min.
5.5
5.5
Min.
0.22
0.22
0.16
0.16
Min.
5.5
5.5
4.1
4.1
E
B
Min. Max. Min. Max. Min. Max. Min.
Marking
Max. Min. Max. Min.
E
Max. Min.
Max. Min. Max.
0.22
0.22
0.16
0.16
3.9
3.9
3.9
3.8
4.1
4.1
4.1
4.2
1
2
1
2
0.78
0.87
D2
19.9
19.9
C
20.9
20.9
22.1
22.1
23.1
23.1
0.19
0.19
0.19
0.19
0.20
0.20
0.20
0.20
D1
4.9
4.9
4.9
4.9
Littelfuse
Trademark
5.2
5.2
5.2
5.2
0.02
0.02
0.02
Top Side
0.04
0.04
D2
0.6
0.6
0.6
0.6
1
C
0.22
15ST120S 0.78
15ST175
0.82
0.87
0.91
0.91
1
0.22
Product Series
1
1
15ST175S 0.82
120
0.02
XX9U
0.04
ST
0.04
0.16
Rating
4.1
Current
0.16
4.1
Part Marking System
Top Side
Product Series
Part Numbering System
15 ST 175 S U
Current Rating
Lot Number
(Contact Littelfuse
for additional
information)
120
XX9U
Littelfuse
Trademark
ST
QUANTITY CODE:
U = 500 (bulk)
LEAD OPTIONS:
Blank = standard
S = slit lead
HOLD CURRENT (VALUE DIVIDED BY 100 = HOLD CURRENT IN AMPS)
SERIES
VOLTAGE RATING (VDC)
Lot Number
(Contact Littelfuse
for additional
information)
Packaging
I
hold
(A)
All Ratings
Packaging
Option
Bulk
Quantity
500
Quantity &
Packaging Codes
U
ST Series
Specifications are subject to change without notice.
Electronics Designers Guide
www.littelfuse.com
©2006 Littelfuse
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