T491A155M016AT vs T540D227K006CH8505
| Part Number |
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| Category | Tantalum Capacitors | Tantalum - Polymer Capacitors |
| Manufacturer | KEMET | KEMET |
| Description | CAP TANT 1.5UF 20% 16V 1206 | CAP TANT POLY 220UF 6.3V 2917 |
| Package | Tape & Reel (TR) | Tape & Reel (TR) |
| Series | T491 | KO-CAP® T540 |
| Type | Molded | Molded |
| Features | General Purpose | High Reliability |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 1206 (3216 Metric) | 2917 (7343 Metric) |
| Tolerance | ±20% | ±10% |
| Size / Dimension | 0.126" L x 0.063" W (3.20mm x 1.60mm) | 0.287" L x 0.169" W (7.30mm x 4.30mm) |
| Voltage - Rated | 16 V | 6.3 V |
| Lead Spacing | - | - |
| Ratings | - | COTS |
| Height - Seated (Max) | 0.071\" (1.80mm) | 0.122\" (3.10mm) |
| Capacitance | 1.5 µF | 220 µF |
| ESR (Equivalent Series Resistance) | 8Ohm | 40mOhm @ 100kHz |
| Lifetime @ Temp. | 2000 Hrs @ 125°C | 2000 Hrs @ 125°C |
| Failure Rate | - | - |
| Manufacturer Size Code | A | D |
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1. Difference between ordinary capacitors and tantalum capacitors
Material: Ordinary capacitors can be aluminum electrolytic capacitors, ceramic capacitors, etc.; while tantalum capacitors use metal tantalum as anode material.
Performance: Generally, tantalum capacitors have better temperature stability and higher capacity-to-volume ratio.
Application range: Due to its performance characteristics, tantalum capacitors are often used in miniaturized electronic products that require high reliability. -
2. Why are tantalum capacitors so expensive?
Tantalum ore resources are scarce and the mining cost is high.
The manufacturing process is complex and the yield is relatively low.
It has excellent electrical characteristics, making it indispensable in high-end applications. -
3. What is the expected life of tantalum capacitors?
Under normal circumstances, it can range from thousands of hours to tens of thousands of hours, depending on the working conditions and manufacturer specifications.
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4. Why do tantalum capacitors explode?
The main reason is that excessive voltage or current shocks cause internal short circuits, which trigger thermal runaway.
Excessive ambient temperature may also exacerbate this situation.
