Overview

This document provides detailed technical specifications and usage guidelines for the TF16VN series chip current fuses designed primarily for automotive applications. The fuses comply with EU RoHS standards and are suitable for protecting secondary circuits in small electronic devices.

Specifications

• Dimensions: 1.6mm x 0.8mm (0603 size code), weight approx. 2.15g per 1000 pieces.
• Construction: Composed of a ceramic substrate, fuse element, inner electrode, Sn plating, Cu/Ni plating, and protective coating.
• Rated Voltage: 32V
• Operating Temperature Range: -55°C to +125°C
• Rated Ambient Temperature: +70°C
• Fusing Characteristics: Normal blow type with stable and reliable fusing performance due to proprietary construction and manufacturing methods.
• Current Ratings: Range from 0.40A to 3.15A with corresponding internal resistance values decreasing as current rating increases.

Features

• Small and lightweight suitable for secondary circuit protection.
• Capable of withstanding 1000 temperature cycles between -55°C and +125°C.
• Compatible with reflow soldering processes.
• Stable fusing characteristics ensured by unique design and manufacturing.
• Compliant with EU RoHS environmental standards.

Applications

Primarily intended for overcurrent protection in automotive electronic devices. Suitable for small electronic circuit blocks requiring reliable current protection.

Performance and Testing

• Fusing Time: Opens within 5 seconds at 250% of rated current at 25°C.
• Mechanical Strength: No electrode peeling or disconnection after bending test (90mm span, 2mm bend, 1 cycle).
• Solder Heat Resistance: Withstands reflow soldering conditions (preheat at 150°C for 90±30s, main heat at ≥230°C for 30±10s, max 260°C).
• Solderability: At least 95% coverage with new solder after testing at 245°C ±3°C for 3s ±0.5s.
• Load Life: 1000 hours at 70°C with rated current cycling (1.5h ON/0.5h OFF).
• Moisture Load Life: 1000 hours at 85°C, 85% RH with 10% rated current cycling.
• Rapid Temperature Change: 1000 cycles between -55°C and +125°C (30 minutes each).
• Solvent Resistance: No damage to protective coating or markings, compliant with MIL-STD-202F.
• Residual Resistance: ≥10kΩ after fuse operation.

Derating and Usage Guidelines

• Rated current must be derated when operating above 70°C ambient temperature; refer to provided derating curve.
• For repeated pulse currents, use the peak current value for rating considerations.
• The fuse substrate is ceramic; avoid exposure to acidic gases or liquids to prevent degradation of mechanical strength and performance.
• Suitable for reflow soldering only; not designed for flow soldering.
• Consult KOA sales representatives before use in critical applications such as automotive, medical, or aerospace equipment due to potential risks of malfunction.

Type Designation and Marking

The product code includes size, fusing characteristics (normal blow), rated current, terminal surface material (Sn plating), and packaging type (taping with 4mm pitch or bulk). Markings on the fuse indicate the rated current for easy identification.

Important Notices

• Specifications are subject to change without prior notice; always confirm with the latest technical specifications before ordering or use.
• Use in life-critical or high-risk equipment requires prior consultation with the manufacturer.
• Environmental hazardous substances other than EU RoHS regulated ones require separate inquiry.