Product Details
Place of Origin: China
Brand Name: TYOHM
Model Number: SQF
Document: SQF Thermal Fuse Cement Res...v1.pdf
Payment & Shipping Terms
Minimum Order Quantity: 1K
Price: Please contact us for details
Packaging Details: T/B
Delivery Time: 7-10 work days
Payment Terms: T/T
Supply Ability: Depending on the specific circumstances, it generally takes 5-7 work days to complete
Resistance Value: |
0.1~50KΩ |
Resistance Tolerance: |
±5% ( J ) |
Resistance Temp. Coeff.: |
±300 Ppm/°C ; <1Ω : ±600 Ppm/°C |
Short-Term Overload: |
10 Times(power Film : 5 Times) Of Rated Wattage For 5 Seconds. ( ±2% ) |
Dielectric Withstanding Voltage: |
AC 1000V For 1 Minutes (No Evidence Of Mechanical Damage) |
Terminal Strength: |
4.5kg ( No Evidence Of Mechanical Damage ) |
Resistance Value: |
0.1~50KΩ |
Resistance Tolerance: |
±5% ( J ) |
Resistance Temp. Coeff.: |
±300 Ppm/°C ; <1Ω : ±600 Ppm/°C |
Short-Term Overload: |
10 Times(power Film : 5 Times) Of Rated Wattage For 5 Seconds. ( ±2% ) |
Dielectric Withstanding Voltage: |
AC 1000V For 1 Minutes (No Evidence Of Mechanical Damage) |
Terminal Strength: |
4.5kg ( No Evidence Of Mechanical Damage ) |
The SQF series is a thermal fuse cement resistor that combines resistance and thermal protection functions in one component. It is designed for circuit boards where resistor performance and thermal fuse protection are required within the same protection circuit.
As a fusible resistor, the SQF series provides resistance during normal circuit operation while supporting thermal fuse protection under specified abnormal conditions. Its anti-surge characteristics and available rated current and functioning temperature options allow engineers to select a suitable configuration according to circuit protection requirements.
The ceramic case and flameproof construction also make the series suitable for circuit protection designs where flameproof structure, insulation and resistance to humidity are required.
| Parameter | SQF Series Specification |
|---|---|
| Product Type | Thermal Fuse Cement Resistor |
| Series | SQF10 |
| Resistance Tolerance | 5% (J) |
| Resistance Range | 0.1Ω–50kΩ; varies by model |
| Rated Current | 3A / 5A / 10A |
| Rated Functioning Temperature | 132°C / 145°C / 185°C |
| Rated Wattage | Approximately 1.6W–4.2W, depending on model |
| Insulation Resistance | 1,000MΩ DC500V |
| Dielectric Withstanding Voltage | AC1000V / 1 minute |
| Short-Time Overload | 10× rated wattage / 5 seconds; Power Film: 5× / 5 seconds |
| Temperature Cycle | ΔR/R ≤1% |
| Load Life | ΔR/R ≤5%, 70°C / 1000 hours |
| Moisture-Proof Load Life | ΔR/R ≤5%, 40°C / 95% RH / 500 hours |
| Case Construction | Ceramic Case / Flameproof Construction |
The product data specifies test conditions for insulation resistance, dielectric withstand voltage, short-time overload, temperature cycling, load life and moisture-proof load life. Model-specific rated current, functioning temperature, resistance range and dimensions are provided in the product specification section.
The SQF series can be used in circuit board protection circuits where a resistor and thermal fuse function are required in the same component. Engineers can select the appropriate fusible resistor configuration according to resistance value, rated current and rated functioning temperature.
For electronic circuit protection, the SQF series can be applied to circuits requiring a combination of resistance, anti-surge characteristics and thermal fuse protection. The flame proof resistor construction uses a ceramic case and incorporates insulation and humidity-resistant characteristics.
For circuits exposed to short-duration surge or overload conditions, the SQF series provides anti-surge characteristics together with specified short-time overload capability. The product data specifies a short-time overload test at 10 times rated wattage for 5 seconds, while the Power Film version uses 5 times rated wattage for 5 seconds.
For circuit protection applications where humidity is an environmental consideration, the moisture proof resistor characteristics can be evaluated using the specified moisture-proof load-life test. The test condition is 40°C, 95% RH for 500 hours, with resistance change limited to ΔR/R ≤5%.
The SQF series is available with 3A, 5A and 10A rated current options, together with rated functioning temperatures of 132°C, 145°C and 185°C. Selection should consider resistance value, rated wattage, ambient operating temperature and the required thermal protection conditions of the circuit.
When the resistor is operated at ambient temperatures above 25°C, the rated power must be derated according to the specified derating curve.
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