| Part Number | 24LT190U | 24LT100U | 
|---|---|---|
| Manufacturer | Littelfuse Inc. | Littelfuse Inc. | 
| Category | PTC Resettable Fuses | PTC Resettable Fuses | 
|   |   | |
| Product Status | Obsolete | Obsolete | 
| Type | Polymeric | Polymeric | 
| Voltage - Max | 24V | 24V | 
| Current - Max | 100 A | 100 A | 
| Current - Hold (Ih) (Max) | 1.9 A | 1 A | 
| Current - Trip (It) | 4.2 A | 2.5 A | 
| Time to Trip | 3 s | 7 s | 
| Resistance - Initial (Ri) (Min) | 30 mOhms | 70 mOhms | 
| Resistance - Post Trip (R1) (Max) | 100 mOhms | 260 mOhms | 
| Resistance - 25°C (Typ) | - | - | 
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | 
| Ratings | - | - | 
| Mounting Type | User Defined | User Defined | 
| Package / Case | Strap | Strap | 
| Size / Dimension | 0.880" L x 0.417" W (22.35mm x 10.60mm) | 0.866" L x 0.199" W (22.00mm x 5.05mm) | 
| Height - Seated (Max) | - | - | 
| Thickness (Max) | 0.039" (1.00mm) | 0.039" (1.00mm) | 
| Lead Spacing | - | - |