A CA501 axial wet tantalum capacitor produced by BEC is a type of high-temperature, wet electrolytic tantalum capacitor with axial leads coming from two different sides. It's known for excellent performance, reliability and long service and shelf life in extreme conditions, especially up to 175℃. These features make it ideal for oil drilling, aerospace and other harsh-environment applications needing stable power filtering or pulse circuits. It features a silver case, glass seal, and polarity, offering high capacitance in a small package. It meets the standard QJ/PWV223 - 2008. it is widely used in oil and gas exploration and drilling equipment, as well as other high-temperature or resistant electronic equipment in the DC or pulse circuits.
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CA501 axial wet tantalum capacitor in 175℃ |
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2.2UF~1000UF |
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6.3V~125V |
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-55℃~175℃ |
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±10%, ±20%, -10%~+30% |
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Unlike solid tantalum capacitors, the CA501 capacitor uses a liquid sulfuric acid electrolyte. This gives it distinct advantages and handling requirements.
The liquid electrolyte acts as the cathode, allowing for self-healing of minor dielectric flaws, which is a critical reliability feature.
Excellent capacitance retention over a wide temperature range and frequency range compared to those solid tantalum capacitors.
Very low ESR across a broad frequency spectrum, making them suitable for filtering and bypassing in high-frequency and pulsed power circuits.
Extremely low DC leakage current which is crucial for timing circuits, sample-and-hold applications, and long-term signal integrity.
Maintains capacitance better at high frequencies.
Can typically withstand 3% to 5% of rated DC voltage in reverse.
Q1: What is the typical leakage current?
A1: Leakage current is very low, typically calculated by the formula: I <= 0.0005 * C * V (µA) or 2µA at 25℃ and 30µA at 175℃, whichever is greater. For a 100µF, 50V cap, that's <= 2.5µA. Actual values in quality parts are often far lower.
Q2: How much reverse voltage can a CA501 capacitor withstand?
A2: This is a key advantage. Most CA501 capacitors allow for a continuous reverse voltage of 3% to 5% of the rated DC working voltage at +25℃ (e.g., a 50V rated part could withstand ~1.5V to 2.5V reverse). This allowance decreases at higher temperatures.
Q3: Can I wave solder or reflow solder a CA501 capacitor?
A3: Wave soldering is standard and acceptable to provide thermal limits. They are observed. Standard infrared or vapor phase reflow soldering is generally not recommended due to the risk of internal pressure buildup from heating the sealed liquid electrolyte.
Q4: Why is the CA501 capacitors' ESR so low, and why does it is important?
A4: The low ESR is a direct result of the high-conductivity liquid electrolyte. It matters Because it minimizes power loss and heating in high-ripple or pulsed applications. It provides superior high-frequency decoupling and filtering performance. It allows for higher surge and ripple current handling.
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