Power Resistor 5W 330Ω
The 5 W, 330 Ω cement power resistor presents itself as a small, solid block of engineering: a rectangular ceramic/cement body with clean edges and two sturdy termination caps from which the leads emerge. Its surface is utilitarian usually a neutral, slightly textured finish with printed markings that identify the resistance value and tolerance. The component feels weighty for its size and clearly designed to be mounted and left to do its work rather than handled frequently.
Once put into service the resistor quietly converts electrical energy into heat. Current flowing through its element raises the body temperature; heat spreads through the cement and is dissipated to the surrounding air. Under steady load the warming is gradual and predictable not dramatic and the part radiates thermal energy steadily rather than in spikes. Its thermal mass and cement housing make that heat distribution even and mechanically protected.
Mechanically it looks durable: the cement shell resists knocks and the lead terminations are robust for soldering or screw-mounting. In an assembly it’s one of those parts you install and forget about until maintenance time but its absence is obvious (no current limiting, different system behavior). Overall it reads as a rugged, dependable workhorse for moderate power dissipation in confined spaces.
Features:
- Cement (ceramic) body for mechanical and thermal protection.
- Good short-time overload and pulse tolerance (designed to handle rated-power ×10 for short intervals).
- Stable resistance over load life with specified limits on change.
- Solderable termination caps (≥95% solder coverage test requirement).
- Wide operating ambient range and clear derating curve for elevated temperature use.
Specifications:
| Parameter | Value |
|---|---|
| Type: | Cement (cement/ceramic) power resistor cement type. |
| Nominal resistance: | 330 Ω |
| Rated power: | 5 W (continuous at rated ambient per datasheet) |
| Resistance tolerance: | Typical options: K (±10%), J (±5%), G (±2%) common selection ±5% (J) |
| Dimensions (L × W × H): | 22 × 9.5 × 9.5 mm (5 W typical dimensions) |
| Maximum working voltage: | 750 V (RMS) for 5 W parts |
| Maximum overload voltage: | 1500 V (single overload limit) |
| Dielectric withstanding voltage: | 1000 V (test condition in table) |
| Insulation resistance: | ≥ 10³ MΩ (as specified in the datasheet) |
| Temperature coefficient: | Metal-oxide film ≈ ±350 ppm/°C; wire-wound ≈ ±260 ppm/°C (type dependent) |
| Short-time overload test: | Rated power × 10 for 5 s (change within ±(2% + 0.05 Ω)) |
| Load life: | Change within ±(5% + 0.05 Ω) after 1000 h at 70 °C (90 min ON / 30 min OFF) |
| Solderability / solder heat: | Solderability ≥95% coverage; solder heat test e.g., 350 ±10 °C, 3 ±1 s |
| Rated ambient / derating info: | Rated at 70 °C ambient for 1–10 W sizes; derate above that per derating curve (see datasheet figure) |
Pinout Diagram:
Footprint Diagram:
Applications:
- Power-dropping / current-limiting resistor.
- Inrush / surge suppression networks.
- Voltage-dropping in power supplies.
- Snubber / damping / pulse energy handling.
- Load / dummy-load for testing and measurement.
Package Contents:
- 1x Power Resistor 5W 330
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