C0805C393M5JACAUTO vs C0603C0G1H3R9C
| Part Number |
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| Category | Ceramic Capacitors | Ceramic Capacitors |
| Manufacturer | KEMET | TDK Corporation |
| Description | CAP CER 0.039UF 50V U2J 0805 | CAP CER 3.9PF 50V C0G 0201 |
| Package | Tape & Reel (TR) | -Reel® |
| Series | SMD Auto U2J | C |
| Features | Low ESL, Low Dissipation Factor | - |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
| Mounting Type | Surface Mount, MLCC | Surface Mount, MLCC |
| Package / Case | 0805 (2012 Metric) | 0201 (0603 Metric) |
| Applications | Automotive | General Purpose |
| Tolerance | ±20% | ±0.25pF |
| Temperature Coefficient | U2J | C0G, NP0 |
| Size / Dimension | 0.079" L x 0.049" W (2.00mm x 1.25mm) | 0.024" L x 0.012" W (0.60mm x 0.30mm) |
| Voltage - Rated | 50V | 50V |
| Lead Spacing | - | - |
| Thickness (Max) | 0.055\" (1.40mm) | 0.013\" (0.33mm) |
| Ratings | AEC-Q200 | - |
| Height - Seated (Max) | - | - |
| Capacitance | 0.039 µF | 3.9 pF |
| Lead Style | - | - |
| Failure Rate | - | - |
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1. Do ceramic capacitors deteriorate over time?
While ceramic capacitors are relatively stable, their capacitance value may decrease slightly over time, especially under extreme environmental conditions. However, this change is usually small and will not significantly affect most applications.
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2. Does the orientation of ceramic capacitors matter?
Ceramic capacitors are non-polar, so the mounting orientation does not affect their function.
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3. Should ceramic capacitors have continuity?
A properly functioning ceramic capacitor should show a certain capacitance value between its pins, not completely on or off.
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4. Why do ceramic capacitors make noise?
Some types of ceramic capacitors (particularly Class 2 ceramic capacitors) produce micro-vibrations when the voltage changes due to their material properties, which in turn cause faint mechanical noise.

