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| Part Number | TRF250-145U | TRF250-145US | TR250-145U | TRF250-145 |
|---|---|---|---|---|
| Manufacturer | Littelfuse Inc. | Littelfuse Inc. | Littelfuse Inc. | Littelfuse Inc. |
| Product Status | Active | Active | Obsolete | Active |
| Type | Polymeric | Polymeric | Polymeric | Polymeric |
| Voltage - Max | 60V (250V Int) | 60V (250V Int) | 250V (60V Int) | 60V (250V Int) |
| Current - Max | 3 A | 3 A | 3 A | 3 A |
| Current - Hold (Ih) (Max) | 145 mA | 145 mA | 145 mA | 145 mA |
| Current - Trip (It) | 290 mA | 290 mA | - | 290 mA |
| Time to Trip | 4 s | 4 s | 2 s | 5 s |
| Resistance - Initial (Ri) (Min) | 3.5 Ohms | 3.5 Ohms | 3.5 Ohms | 3 Ohms |
| Resistance - Post Trip (R1) (Max) | 14 Ohms | 14 Ohms | 12 Ohms | 14 Ohms |
| Resistance - 25°C (Typ) | - | - | - | - |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Ratings | - | - | - | - |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole |
| Package / Case | Radial, Disc | Radial, Disc | Radial, Disc | Radial, Disc |
| Size / Dimension | 0.236" L x 0.150" W (6.00mm x 3.80mm) | 0.236" L x 0.150" W (6.00mm x 3.80mm) | 0.236" L x 0.150" W (6.00mm x 3.80mm) | 0.256" L x 0.181" W (6.50mm x 4.60mm) |
| Height - Seated (Max) | 0.394" (10.00mm) | 0.394" (10.00mm) | 0.394" (10.00mm) | 0.433" (11.00mm) |
| Thickness (Max) | - | - | - | - |
| Lead Spacing | 0.197" (5.00mm) | 0.197" (5.00mm) | 0.197" (5.00mm) | 0.197" (5.00mm) |
