1812 Series Resettable Fuses
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1812 Series Resettable Fuses

  • Surface mount overcurrent protection.g
  • Resettable protection is desired
  • Protecting against over-current and over-temperature faults
  • RoHS compliant , lead-free and halogen free 
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The resistance of PTCs rises as the temperature rises. With this feature, the value change of resistance is not obvious when the safe current passes, the resistance value changes drastically when abnormal current passes, this reaches the purpose of limiting abnormal current, the resistance value will “reset” automatically when the abnormality is eliminated and temperature returns to a safe level . It is an ideal choice for equipment with frequent abnormal over-current flowing area. PPTC often used in consumer electronics, power lines, telecommunications, I/O connectors, process control and medical equipment.


Specifications

● Certification: RoHS

● Packaging: in reel

● Smaller size saves board space and cost

● Resettable circuit protection

● Fast time-to-trip

● Low resistance

● Surface mount packaging for automated assembly

● Lead-free and compliant with the European Union RoHS Directive 2002/95/EC


Warning

PPTC devices are intended for protection against occasional over-current or over-temperature fault conditions ,and should not be used when repeated fault conditions are anticipated . Operation beyond maximum ratings or improper use may result in device damage and possible electrical arcing and flame.


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Test

Test Conditions

Accept/Reject Criteria

Resistance

In still air @ 25℃

Rmin≤R≤R1max

Time to Trip

Vmax, 25℃, In still air @ 25℃

T≤max. time to trip(seconds)

Hold Current

30 min. at IH, In still air @ 25℃

No trip

Trip Cycle Life

Vmax, Imax, 100 cycles, In still air @ 25℃

No arcing or burning

Trip Endurance

Vmax, 1 hours, In still air @ 25℃

No arcing or burning

Operating/Storage Temperature

-40℃ to +85℃

Maximum Device Surface Temperature in Tripped State

125℃

Passive Aging

Passive Aging +85℃,1000 hours  ±5% typical resistance change

Humidity Aging

+85℃, 85%R.H. 1000 hours  ±5% typical resistance change

Thermal Shock

MIL-STD-202 Method 107G

+85℃/-40℃ 20 times        -30% typical resistance change

Solvent Resistance

MIL-STD-202, Method 215                     No change

Vibration

MIL-STD-883C, Method 2007.1, Condition A      No change


图片3

Part number A B C D E
Min. Max. Min. Max. Min. Max. Min. Min.
SMD1812-010 4.37 4.73 3.07 3.41 0.50 1.00 0.30 0.25
SMD1812-014 4.37 4.73 3.07 3.41 0.50 1.00 0.30 0.25
SMD1812-020 4.37 4.73 3.07 3.41 0.50 1.00 0.30 0.25
SMD1812-030 4.37 4.73 3.07 3.41 0.50 1.00 0.30 0.25
SMD1812-050 4.37 4.73 3.07 3.41 0.40 0.90 0.30 0.25
SMD1812-075 4.37 4.73 3.07 3.41 0.40 0.90 0.30 0.25
SMD1812-110 4.37 4.73 3.07 3.41 0.40 0.90 0.30 0.25
SMD1812-125 4.37 4.73 3.07 3.41 0.30 0.80 0.30 0.25
SMD1812-150 4.37 4.73 3.07 3.41 0.30 0.80 0.30 0.25
SMD1812-160 4.37 4.73 3.07 3.41 0.40 0.80 0.30 0.25
SMD1812-200 4.37 4.73 3.07 3.41 0.40 0.80 0.30 0.25
SMD1812-260 4.37 4.73 3.07 3.41 0.40 1.10 0.30 0.25
SMD1812-300 4.37 4.73 3.07 3.41 0.50 1.20 0.30 0.25
SMD1812-350 4.37 4.73 3.07 3.41 0.50 1.20 0.30 0.25


Model Vmax(Vdc) Imax( A) Ihold @25℃ (A) Itrip @ 25℃ (A) Pd Max( W) Max Time to trip Resistance
Current
(A)
Time
(Sec)
R1min
(Ω)
R1max
(Ω)
SMD1812-010 60.0 100 0.10 0.30 0.8 0.5 1.50 0.750 15.00
SMD1812-014 60.0 100 0.14 0.34 0.8 1.5 1.15 0.650 6.000
SMD1812-020 30.0 100 0.20 0.40 0.8 8.0 0.20 0.350 5.000
SMD1812-030 30.0 100 0.30 0.60 0.8 8.0 0.10 0.250 3.000
SMD1812-050 15/16/33/60 100 0.50 1.00 0.8 8.0 0.15 0.150 1.000
SMD1812-075 13.2/33 100 0.75 1.50 0.8 8.0 0.20 0.090 0.450
SMD1812-110 8/16/24/33 100 1.10 2.20 0.8 8.0 0.30 0.050 0.250
SMD1812-125 16.0 100 1.25 2.50 0.8 8.0 0.40 0.050 0.140
SMD1812-150 8/16/24 100 1.50 3.00 0.8 8.0 0.50 0.040 0.160
SMD1812-160 8.0 100 1.60 2.80 0.8 8.0 1.00 0.030 0.130
SMD1812-200 8/16 100 2.00 4.00 0.8 8.0 2.00 0.020 0.100
SMD1812-260 8/12 100 2.60 5.00 0.8 8.0 2.50 0.015 0.050
SMD1812-300 8.0/13.2 100 3.00 5.00 0.8 8.0 4.00 0.012 0.040
SMD1812-350 6.0 100 3.50 6.00 2.0 10.0 4.00 0.008 0.030


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