UBF Series RT33 (33V)
Details
UBF RT33 (33V)
 
Electrical Characteristics
 
Part No  
Figure / Lead Option
lhold (A) Itrip
(A)
Vmax
(V)
Imax
(A)
Pd typ
(W)
Max.
(A)
Time-to-trip
 (s)
R min
(Ω)
R1 Max
 (Ω)
UBF RT33050 Fig. 1, Ø0.51, Sn/CuFe 0.50 1.00 33 40 0.67 5.0 2.25 0.140 0.048
UBF RT33075 Fig. 1, Ø0.51, Sn/CuFe 0.75 1.50 33 40 0.71 4.0 3.75 0.115 0.368
UBF RT33090 Fig. 1, Ø0.51, Sn/CuFe 0.90 1.80 33 40 0.74 3.5 4.50 0.090 0.228
UBF RT33120 Fig. 1, Ø0.51, Sn/CuFe 1.20 2.30 33 40 0.78 3.5 6.00 0.074 0.180
UBF RT33135 Fig. 1, Ø0.51, Sn/CuFe 1.35 2.50 33 40 0.84 4.5 6.75 0.059 0.143
UBF RT33160 Fig. 1, Ø0.51, Sn/CuFe 1.60 2.75 33 40 0.86 4.5 8.00 0.041 0.131
UBF RT33190 Fig. 2, Ø0.81, Sn/CuFe 1.90 3.00 33 40 0.90 3.5 9.50 0.045 0.092
UBF RT33220 Fig. 2, Ø0.81, Sn/CuFe 2.20 3.50 33 40 0.95 6.5 11.00 0.025 0.080
UBF RT33250 Fig. 2, Ø0.81, Sn/CuFe 2.50 4.00 33 40 0.99 8.0 12.50 0.020 0.064
 
 
Comment
 
Ihold Hold current is the maximum current that UB Fuse can pass through without interruption at 20°C unless otherwise specified.
Itrip Trip current is the minimum current that will switch the device from low resistance state to high resistance state at 20°C unless specified.
Vmax The maximum voltage device can withstand without damage at rated current.
Imax The maximum current device can withstand without damage at rated voltage.
Pd The power dissipated from device when in the tripped state at 20°C unless otherwise specified.
R min The minimum resistance of device as received from the factory at 20°C unless otherwise specified.
 
R max The maximum resistance of device as received from the factory at 20°C unless otherwise specified.
R1max The maximum resistance of device when measured one hour post trip at 20°C unless otherwise specified.
Max.
Time-to-trip
The maximum time for device to trip at specified current ratings at 20°C unless otherwise specified.
 
 
◆ Environmental Characteristics
 
Test Test Conditions Resistance Change
Passive Aging +85°C, 1000 hours  ±5% typical resistance change
Humidity Aging +85°C, 85% R.H., 7 days  ±5% typical resistance change
Thermal Shock +85°C to -40°C, 10 times
MIL-STD-202, Method 107G
 ±5% typical resistance change
Vibration MIL-STD-883C, Condition A No change
Solvent resistance MIL-STD-202, Method 215 No change
 
 

 
Dimensions
 
  A B C D E F
Part No Max. Max. Typical Min. Max. Typical
UBF RT33050 7.4 12.2 5.1 7.6 3.0 1.1
UBF RT33075 7.4 12.2 5.1 7.6 3.0 1.1
UBF RT33090 7.4 12.2 5.1 7.6 3.0 1.1
UBF RT33120 7.4 12.2 5.1 7.6 3.0 1.1
UBF RT33135 7.4 14.2 5.1 7.6 3.0 1.1
UBF RT33160 7.4 14.0 5.1 7.6 3.0 1.1
UBF RT33190 9.0 13.5 5.1 7.6 3.0 1.1
UBF RT33220 10.0 17.5 5.1 7.6 3.0 1.1
UBF RT33250 10.0 19.5 5.1 7.6 3.0 1.1
 
 
 
●NOTE:
 

All drawings are not in scale and layout may vary. 
All parts dimension is in millimeter unless otherwise specified.
Radial-leaded parts are not designed for reflow soldering.
 
 
●Lead Materials: 
 
UBF RT33050 – 250, Tin plated Copper Steel, Ø0.51mm / 0.205mm2  / 24 AWG
 
●Insulation Materials:     Cured, flame-retardant epoxy polymer that meets UL94V-0
 
●Agency Approval:
 
UL File Number E 119550
c-UL File Number E 119550
TUV File Number Pending
 
 

 
 
◆Typical Thermal Derating Chart - Ihold (A)
 
Part No -40 -20 0 20 40 60 85
UBF RT33050 0.74 0.68 0.60 0.50 0.45 0.39 0.32
UBF RT33075 1.11 1.01 0.90 0.75 0.68 0.59 0.48
UBF RT33090 1.33 1.22 1.08 0.90 0.81 0.70 0.58
UBF RT33120 1.78 1.62 1.62 1.35 1.22 0.94 0.77
UBF RT33135 2.00 1.82 1.62 1.35 1.22 1.05 0.86
UBF RT33160 2.37 2.16 1.92 1.60 1.44 1.25 1.02
UBF RT33190 2.81 2.57 2.28 1.90 1.71 1.48 1.22
UBF RT33220 3.26 2.97 2.64 2.20 1.98 1.72 1.41
UBF RT33250 3.70 3.38 3.00 2.50 2.25 1.95 1.60
 
 

 
 
Typical Time To Trip Curve at 20°C
 

 
 

 
 
◆Packaging Information
 
Part No -1 Loose Pack Quantity -2 Tape & Reel Quantity -3 Ammo Pack Quantity
UBF RT33050 500 3000 2000
UBF RT33075 500 3000 2000
UBF RT33090 500 3000 2000
UBF RT33120 500 3000 2000
UBF RT33135 500 2500 2000
UBF RT33160 500 2500 2000
UBF RT33190 500 2000 2000
UBF RT33220 500 2000 2000
UBF RT33250 500 1500 1500