ICP-S Technical Manual
Overcurrent Protection Elements
ICP-S Technical Manual
ICP-S
1. Overview
The ICP-S is an IC protector of surface mounting type developed as an element for the protection of ICs from output
short-circuiting damage. The internal resistance of this lightweight, compact overcurrent protection element is low, as long
as the steady-state current of the element does not exceed the rated DC or AC current. The ICP-S, however, turns off ICs
instantly if the steady-state current reaches or exceeds the breaking current of the ICP-S.
2. External Dimensions (Unit: mm)
3.0±0.1
φ1.5
+0.1
−0
4.0±0.1
4.0±0.1
2.0±0.05
3.5±0.05
1.75±0.1
0.4±0.1
3.2±0.2
2.0±0.1
1.55±0.1
3.5±0.2
5.3±0.2
φ1.15±0.1
2.5±0.1
0~0.5
8.0±0.2
0~0.1
0.6
1.0
1.8±0.1
TN direction
2.8±0.2
2.3±0.2
(Mark: TN)
3. Features
1) Instantly breaks currents with a low potential drop.
(See 3-1 Potential Drop Comparison)
2) Compact surface-mounting model.
(See 2. External Dimensions)
3) Unlike fuses, there is no steady-state current reduction with the rated current applied. No derating is necessary.
4) Minimal breaking point dispersion.
(See the graph in 3-2 Breaking Current Dispersion
Characteristics)
5) Excellent temperature characteristics
(See the graphs in 3-3 Temperature Characteristics)
• The fluctuation of the breaking current caused by temperature changes is minimal.
• Wide operating temperature range:
−55°C
to
+125°C
6) Excellent vibration resistance.
7) UL-approved product with certification No. 107856.
8) No deterioration or circuit breaking caused by static electricity.
Rev.A
1/13
ICP-S Technical Manual
Overcurrent Protection Elements
3-1 Potential Drop Comparison (ICP-S VS Fuse)
ICP-S1.0 (Rated Current: 1 A)
2.0A
1.8A
1.5A
+
1.0A
DC
500mV / div
NORMAL
10mSEC / div
Fuse (Rated Current: 1 A)
4.0A
3.0A
2.0A
+
1.0A
DC
500mV / div
NORMAL
10mSEC / div
Rev.A
2/13
ICP-S Technical Manual
Overcurrent Protection Elements
3-2 Breaking Current Dispersion Characteristics
1000
100
Breaking time (mec)c
10
max
typ
1
min
n=5pcs×5lot
0.1
0.01
0 1 2 3 4
5 6 7 8
9 10 11 12 13 14 15 16 17 18 19 20
Breaking Current (A)
Breaking Time (Reference) Effective Value and Dispersion Data (ICP-S1.0)
3-3 Temperature Characteristics
1.2
3.0
1.1
2.5
Breaking current ratio
1.0
Current applied (A)
2.0
0.9
1.5
1.2
1.0
0.7
S1.2
S1.0
S0.7
S0.5
0.8
0.7
0.5
0
−50
−25
0
25
50
75
100
125
0
0
25
50
75
100
125
150
175
Ambient temperature Ta (°C)
Breaking Current vs.
Ambient Temperature Characteristics (ICP-S)
Ambient temperature Ta (°C)
Rated Current Derating Curve (ICP-S)
Rev.A
3/13
ICP-S Technical Manual
Overcurrent Protection Elements
4. Selection Flowchart
Type of steady-state current?
DC
Pulse
Surge current Inrush current
included
included
Check with the I
2
t characteristics graph.
Does the steady-state
current not exceed the rated
current of the ICP?
Yes
No
Change the ICP model
to satisfy the condition.
Is the rated voltage (i.e., the
open-circuit voltage when the ICP
breaks the current) 50 V or below?
No
Yes
Lower the
open-circuit voltage.
Is the breaking current (the maximum
abnormal current) within a range
of 2x to 10x of the ICP's rated current?
Yes
Change the ICP model to
satisfy the condition.
No
The selection is OK.
List of ICP-S Models
TYPE
Rated current (A)
0.5
ICP-S0.5
0.7
ICP-S0.7
1.0
ICP-S1.0
1.2
ICP-S1.2
Breaking current (A)
1.0 to 5.0
1.4 to 7.0
2.0 to 10.0
2.4 to 12.0
The I
2
t-t characteristic graph (i.e., the Joule integral sheet) provides necessary data used to check
how the life of the ICP-S is influenced by heat cycling or mechanical fatigue caused by repetitive
current pulses.
Rev.A
4/13
ICP-S Technical Manual
Overcurrent Protection Elements
5. Checks with I
2
t-tCharacteristic Graph
If the steady-state current includes a pulse, surge, or inrush-current, use the I
2
t
graph and check that the ICP will not deteriorate regardless of the mode of the
current or the ICP will not break the steady-state current while the ICP is in operation.
I
2
t-t Graph
I
2
t-t Graph
Breaking
current area
I
2
t (A
2
- ms)
Deterioration
area
Safety area
Margin area
t (s)
Breaking current area: The ICP breaks the current in this area.
Deterioration area: Although the ICP does not break the current instantaneously,
the ICP may break the current as a result of ICP deterioration.
Marginal area: The area where the risk of ICP deterioration is low.
Basically avoid using this area.
Safety area: The ICP will not deteriorate or break the current.
Precautions
• Even though the Joule integral value of the current wave form designed at your end is
within the safety area, it is recommended that you confirm the steady-state current for
the safety of the components
Refer to the next section, calculate the I
2
t value, and check the position of the I2t value
in the graph. If the value is in the safety area, it is okay to use the selected ICP model.
If the value is, however, beyond the safety area, use an ICP model with higher ratings.
• Note: The inspection and selection of the ICP according to the Joule integral value is
absolutely based on the results of the approximation of the current wave form.
Be sure to inspect all the current wave forms of your application, or otherwise the safety
of the application will not be fully ensured.
• Consider a safety margin with the dispersion of component characteristics taken into
calculation when inspecting and selecting the ICP, if it is impossible to check the worst
current wave form.
Rev.A
5/13
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