24
Surface Mount Resettable PTCs
Revision May 18, 2018
1 / 4
@ UN Semiconductor Co., Ltd. 2018
Specifications are subject to change without notice.
Please refer to www.unsemi.com.tw for current information.
SMD2920 Series
UN Semiconductor Co., Ltd. www.unsemi.com.tw
The SMD2920 Series PTC provides surface mount
over-current protection for applications where space is at a
premium and resettable protection is desired.
u RoHS compliant, Lead-Free and Halogen-Free
u Fast time-to-trip
u Compact design saves board space
u Low resistance
u Low-profile
u PC motherboard - plug and play protection
u Mobile phones - battery and port protection
u Game console port protection
u USB peripherals
u Disk drive
u PDAS / digital cameras
u Power ports
u General electronics
Hold
Current
Trip
Current
Rated
Voltage
Max
Current
Typical
Power
Maximum Time
To Trip
Resistance
Part Number
I
hold
(A) I
trip
(A)
V
max
(Vdc)
I
max
(A)
P
dtyp.
(W)
Current
(A)
Time
(Sec.)
R
min
(Ω)
R
1max
(Ω)
SMD2920-030 0.30 0.60 60 100 1.5 1.5 3.0 0.600 4.800
SMD2920-050 0.50 1.00 60 100 1.5 2.5 4.0 0.180 1.400
SMD2920-075 0.75 1.50 33 100 1.5 8.0 0.3 0.100 1.000
SMD2920-110 1.10 2.20 33 100 1.5 8.0 0.5 0.065 0.410
SMD2920-125 1.25 2.50 33 100 1.5 8.0 2.0 0.050 0.250
SMD2920-150 1.50 3.00 33 100 1.5 8.0 2.0 0.035 0.230
SMD2920-185 1.85 3.70 33 100 1.5 8.0 2.5 0.030 0.150
SMD2920-200/24 2.00 4.00 16/24 100 1.5 8.0 4.5 0.020 0.120
SMD2920-250/24 2.50 5.00 16/24 100 1.5 8.0 16.0 0.020 0.085
SMD2920-260 2.60 5.20 6 100 1.5 8.0 10.0 0.014 0.075
SMD2920-300 3.00 6.00 6 40 1.5 8.0 20.0 0.012 0.048
SMD2920-300/16V 3.00 6.00 16 100 1.5 8.0 20.0 0.012 0.048
I
hold
= Hold current: maximum current device will pass without tripping in 23°C still air.
I
trip
= Trip current: minimum current at which the device will trip in 23°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
dtyp.
= Power dissipated from device when in the tripped state at 23°C still air.
R
min
= Minimum resistance of device in initial (un-soldered) state.
R
1max
= Maximum resistance of device at 23°C measured one hour after tripping.
Caution: Operation beyond the specified rating may result in damage and possible arcing and flame.
Electrical Parameters
Applicable
Description
Features
SMD2920-300/ V 3.00 6.00 100 1.5 8.0 20.0 0.012 0.048 24
. . . . . . .
Surface Mount Resettable PTCs
Revision May 18, 2018
2 / 4
@ UN Semiconductor Co., Ltd. 2018
Specifications are subject to change without notice.
Please refer to www.unsemi.com.tw for current information.
SMD2920 Series
UN Semiconductor Co., Ltd. www.unsemi.com.tw
Profile Feature
Pb-Free Assembly
Average Ramp-Up Rate (T
S
max to T
P
)
3°C/second max.
Preheat :
Temperature Min (T
S
min)
Temperature Max (T
S
max)
Time
(
T
S
min to T
S
m
ax)
150°C
200°C
60-180 seconds
Time maintained above:
Temperature(TL)
Time (tL)
217°C
60-150 seconds
Peak/Classification Temperature(T
P
):
260°C
Time within 5°C of actual peak:
Temperature 20-40 seconds
Ramp-down Rate:
6°C/ second max.
Time 25°C to Peak Temperature
8 minutes max.
Note: All temperatures refer to of the package, measured on the package body surface.
Solder reflow
Due to “Lead Free” nature, Temperature and Dwelling time for the
soldering zone is higher than those for Regular. This may cause
damage to other components.
1. Recommended max past thickness > 0.25mm.
2. Devices can be cleaned using standard methods and aqueous
solvent.
3. Rework use standard industry practices.
4. Storage Environment : < 30/ 60%RH℃
Caution:
1. If reflow temperatures exceed the recommended profile, devices
may not meet the performance requirements.
2. Devices are not designed to be wave soldered to the bottom side
of the board.
5
Terminal pad material Pure Tin
Soldering Characteristics Meets EIA specification RS 186-9E, ANSI/J-std-002 Category 3
Temperature Rerating Chart
–
I
hold
(A)
Soldering Parameters
Material Specifications
Ramp-down
Preheat
Critical Zone
T
L
to T
P
Time to peak temperature
(t 25℃ to peak)
T
P
T
L
T
S(max)
T
S(min)
25
Temperature
Ramp-up
Time
Temperature Rerating Curve
Average Time Current Curves
Average Time Current Curves
0.01
0.1
1
10
100
0.1 1 10010
Current In Amperes
Time In Seconds
3.00A
0.50A
0.75A
1.00A
1.25A
1.5A
1.85A
2.0A
2.5A
2.6A
0.3A
Derating Curves for SMD Series
0
20
40
60
80
100
120
140
160
-40 -20 0 20 40 60 80
Temperature (°C)
Percentage of Derated
Current