5% precision FRL Fusible Resistor, Flameproof Resistor for Circuit Board

Features

• It is suitable for protecting circuit boards.
• Noncombustible insulating coating; Solvent Proof and resistant to high temperature.
• Low temperature coefficient (200ppm/℃).
• Uniform in fusing time.

Product Positioning and Core Applications

The FRL series is a fusible resistor with a flameproof design, developed for electronic circuits and PCB applications where circuit protection is required. It uses a noncombustible insulating coating and is designed to provide solvent resistance and high-temperature resistance while combining resistance and fusing protection within one component.

The core function of the FRL series is to operate as a resistor during normal circuit operation and provide fusing protection under specified overload conditions. The specified fusing time is within 60 seconds, while the actual fusing time can also be agreed between the buyer and manufacturer before production.

The series is available with ±1% and ±5% resistance tolerance, a 200 ppm/℃ temperature coefficient, rated power ratings from 1/4W to 2W, and a resistance range of 0.22Ω to 10KΩ.

Product Parameters

The maximum working voltage varies according to the rated power. The 1/4W, 1/2W, 1W and 2W versions are specified with maximum working voltages of 250V, 300V, 350V and 500V respectively. The rated continuous working voltage is determined by the lower value between rated power × resistance value and the specified maximum working voltage.

When operated at ambient temperatures above 70℃, the rated load must be derated according to the specified derating curve. The environmental test conditions cover -55℃ to +155℃, with the product specification also including short-time overload, dielectric withstand voltage, insulation resistance, temperature cycling, load life and moisture-proof load life tests.

Application Fields

1. PCB Circuit Board Protection

FRL fusible resistors are suitable for electronic circuits requiring circuit board protection. Their fusible resistor structure combines resistance and over-current protection functions in one component, making them suitable for PCB circuits where abnormal current conditions need to be addressed.

2. Power Supply and Electronic Control Circuits

In power supply and electronic control circuits, FRL can be used as a resistor-based protection component. Under specified overload conditions, the resistor can provide protection according to its fusing characteristics. The available power ratings, resistance values and maximum working voltages allow engineers to select a suitable configuration according to circuit requirements.

3. Industrial Electronic Equipment

FRL can be applied to PCB protection circuits in industrial electronic equipment. With rated power ratings from 1/4W to 2W and a resistance range of 0.22Ω to 10KΩ, the series provides multiple configurations for engineering selection. Its specifications reference IEC 60115-1 and JIS C 5201-1.

4. Automotive Electronic Circuits

For automotive electronic PCBs using resistor-based protection solutions, FRL can be considered as a fusible resistor for circuit protection design. However, the current product datasheet does not state AEC-Q200 qualification or other automotive-specific certifications. Specific automotive applications should therefore be evaluated according to the customer's system and certification requirements.

5. Electronic Circuits Requiring Flameproof Design

FRL uses a noncombustible insulating coating and is positioned as a flameproof resistor. It can be considered for electronic circuits where flame-resistant component characteristics are required. The specification also provides resistance to high temperature, solvent-proof characteristics and nonflammability-related test requirements as technical references for component selection.