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Part No.	NBK030205-E10480B
Manufacturer	LITTELFUSE
Size	195 Kbytes
Pages	4 pages
Description	157 Series . Standard Nano Fuse and Clip Assembly

Datasheet Summary with AI

1. Overview and Introduction

️· Product: Littelfuse 157 Series Fuses
️· Purpose: Primarily for overcurrent protection
️· Website: [www.littelfuse.com/series/157.html](https://www.littelfuse.com/series/157.html) (for current information)
️· Document Revision: February 19, 2010

2. Key Features & Specifications

️· Operating Temperature: -55°C to 125°C (with proper derating)
️· Thermal Shock: Meets Test Condition B
️· Vibration: Meets Test Condition B (10-55 Hz)
️· Moisture Resistance: 10 cycles (Test Condition B)
️· Salt Spray/Atmosphere: 48 hrs, 5% NaCl (Test Condition B)
️· Shock: 100 Gs peak for 6 milliseconds (Test Condition I)
️· Resistance to Solvents: Meets specified requirements.
️· Humidity Test: 1000 hours
️· Thermal Shock test: Test condition B
️· PCB Recommendation: Fuse body temperature not exceeding 80°C in a 25°C ambient.

3. Construction/Materials

️· Body: Ceramic
️· Caps (for lower amperage fuses): Brass, Au-plated
️· Caps (for higher amperage fuses): Brass, Silver-plated
️· Clip Plating: Specified Material (see chart for specifics)
️· Product Marking: Brand Logo, Current Rating

4. Soldering Parameters (Lead-Free Assembly)

️· Detailed specifications for reflow soldering are provided, including pre-heat temperatures/times, ramp-up rates, peak temperatures, and time within 5°C of peak. The reflow conditions are specifically designed for lead-free assembly.
️· Maximum temperature limits are defined for various stages of the soldering process.

5. Electrical Characteristics

️· Resistance to Solvents: Specified material (see chart).
️· Average Time Current Curves: Not fully detailed in the text, but referenced.
️· Temperature Rerating Curve: Not included, but referenced.

6. Dimensions & Part Numbering

️· Dimensions: Dimensions for various elements of the fuse are provided with both imperial (inches) and metric (mm) units. Diagrams illustrating these dimensions are included.
️· Part Numbering System: Detailed explanation of the code structure:
- 0157: Series identifier
- XXX: Amp Code (Current Rating)
- R: Packaging Option (Tape and Reel)
- D: Quantity Code (1500pcs)
️· PCB Recommendation for Thermal Management: The fuse body temperature should not exceed 80°C in a 25°C ambient.

7. Packaging Information

️· Tape and Reel: Quantity of 1500 pieces.
️· Packaging Codes: DR

8. Other Notes

️· Specifications are subject to change without notice.
️· Alternate thermal management methods can be used, but fuse body temperature must not exceed 80°C in a 25°C environment.
️· Refer to Littelfuse's website for the most up-to-date information.