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Film Fusible Resistors

Applications: Consumer electronics, industrial control, power management

Rated Power: Standard	Rated Power: Miniature	φD (mm)	L (mm)	H (mm)	φd (mm)	Resistance Range	Maximum Working Voltage	Maximum Overload Voltage	Dielectric Withstand Voltage
1/4W	1/2WS	2.3±0.5	6.5±1.0	28±2	0.45±0.1	0.1Ω–82Ω	–	–	250V
1/2W	1WS	3.5±0.5	9.0±1.0	25±2	0.50±0.1	0.1Ω–120Ω	–	–	250V
1W	2WS	4.5±1.0	11.5±1.5	24±3	0.60±0.1	0.1Ω–330Ω	–	–	350V

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Rated Power Multiple	R < 2Ω: Fusing Time	2–10Ω: Fusing Time	R > 10Ω: Fusing Time
16 times	≤60 seconds	≤45 seconds	≤30 seconds
25 times	≤60 seconds	≤30 seconds	≤15 seconds
32 times	≤30 seconds	≤15 seconds	≤10 seconds

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If the rated voltage exceeds the maximum working voltage, use the maximum working voltage.

Test Item	Technical Requirements	Test Conditions / Standard
Operating temperature range	-55°C to +155°C
Insulation resistance	≥1GΩ
Dielectric withstand voltage	No burning or insulation breakdown	Apply the AC voltage specified for each rating for 1 minute
Temperature coefficient	±350ppm/°C (±500ppm/°C for R < 1Ω)	Test temperature: room temperature +100°C
Short-time overload	±(2%+0.05Ω)	2.5 times rated voltage for 5 seconds
Temperature cycling	±(1%+0.05Ω)	-55°C to +155°C, 5 cycles
Moisture resistance under load	±5%	40°C, 95%RH; rated voltage applied for 1.5 hours ON, 0.5 hours OFF, for 1000 hours
Load life	±5%	70°C, 95%RH; rated voltage applied for 1.5 hours ON, 0.5 hours OFF, for 1000 hours
Solderability	Coverage of at least 95%	255°C for 3 seconds
Resistance to soldering heat	±(1%+0.05Ω)	350°C for 3 seconds