Littelfuse 494 Series Surface Mount Fuses
Littelfuse 494 Series Surface Mount Fuses (SMF) are fast-acting, ultra-small, and thin film devices designed for secondary protection of circuits. These fuses are completely lead-free and meet the RoHS directive requirements. These 494 series fuses are made of high-performance materials to exhibit improved performance in extreme ambient temperature applications. The 494 series fuses feature a flat top surface for pick-and-place operations and are marked with codes to identify ampere rating without testing. These 494 series surface mount fuses are designed to be low profile for height-sensitive applications. The 494 series fuses are built with alloy-based elements to provide superior inrush withstand characteristics and element-covering material to resist industry cleaning operations. These 494 series fuses are used in secondary protection for space-constrained applications like cell phones, digital cameras, hard disks and DVD drives, and battery packs.
The 494 series fuses exhibit 5°C/sec of average Ramp-up Rate and average Ramp-down Rate with an operating temperature range of -55°C to 90°C. These 494 series surface mount fuses can withstand up to 5 cycles of thermal shock in the operating temperature range. The 494 series fuses feature greater than 10,000Ω of insulation resistance and 60 seconds of resistance to soldering heat within the 200°C to 260°C range.
Features
- Lead-free solder compatible
- High-temperature profile compatible
- Efficient performance in elevated ambient temperature
- Code marked top surface for ampere rating identification
- Low profile for height-sensitive applications
- Flat top surface for pick-and-place operations
- Resistant to industry standard cleaning operations
- Superior inrush withstand characteristics
Specifications
- -55°C to 90°C operating temperature range
- 5°C/sec maximum average Ramp-up Rate (TL)
- 5°C/sec maximum average Ramp-down Rate (TS(max) to TL)
- 250+0/-5°C peak temperature (TP)
- 150°C minimum pre-heat temperature (TS(min))
- 200°C maximum pre heat temperature (TS(max))
- Withstands 60 seconds above 200°C to 260°C of soldering heat
- Withstands 5 cycles of thermal shock
- Humidity MIL-STD-202F, method 103B, condition D
- Vibration per MIL-STD-202F
- Greater than 10,000Ω insulation resistance
Applications
- Cell phones
- Digital cameras
- Hard disks drives
- DVD drives
- Battery packs
Dimensions mm
Temperature Rerating Curve
Average Time Current Curves
Publicado: 2022-07-26
| Actualizado: 2022-12-16