Select nbo capacitor

Using relatively new to replace the traditional aluminum niobium oxide can save the audio application spending.

With niobium oxide capacitors, via your aluminum capacitor printed circuit board design into a smaller SMT assembly like how? If you consider the latest audio feedback system manufacturer, then the idea is right!

Time back Back to archives, to find Pease Porridge, this article analyzes the audio circuit of aluminum and other voice characteristics of capacitor technology. It was concluded that, despite the oscilloscope trace or measure features at any different, but the use of aluminum capacitors in the audio experience, and obviously more smoothly.

Now low-ESR electrolytic capacitors and aluminum niobium oxide capacitors similar. Japan's leading manufacturer of audio latest experimental results show that even lower order of magnitude as 10μf capacity is likely to get good sound quality, 100μf magnitude to mention the sound quality to provide the most high-end.

Leaving aside the subjective audiophile analysis aside, a large number of difficult to determine who also supported niobium oxide from the aluminum lead to SMT conversion to accommodate a wide range of power applications, including:

● combines high capacitance, low ESR, low residual inductance.

● Low-voltage AC ripple improved with time, temperature stability is no problem.

● relaxed temperature and humidity environment will include niobium oxide capacitors audio applications.

● determine the SMT EIA standard size.

● High temperature reflow can be ROHS compatible with the vibration or shock.

● to improve reliability.

● to improve the ripple performance.

High-low ESR low ESL capacitor value

When the supply of aluminum and niobium oxide for comparison, ESR and frequency relationship is a key factor. In many applications, low capacitance equivalent niobium oxide capacitors can be used to replace aluminum capacitor filter.

ASIC decoupling of the power distribution with the motherboard, low inductance is also important. In situ analysis shows that, from through hole to SMT upgrade immediately to improve the ESR, converted to transient load changes and the ripple processing.

Another feature of niobium oxide capacitors is that they can work under minimum voltage drop (see reliability section), so the rated voltage of 6.3V the device is suitable for 5.5V output rail. Together with the core applications designed specifically for low-voltage, capacitance can be further maximized, 680μF 2.5V applications available.

Improve the stability of the

When used, the standard aluminum in 40 ~ 85 ℃ operating range longer life expectancy, reliability standards apply only less than 105 ℃. On the other hand, the operation of niobium oxide capacitors rated voltage in a range: 55 ~ 85 ℃, the maximum voltage drop does not exceed 125 ℃.

Parameters, if its operation in the temperature range, the aluminum electrolytic capacitor will have a maximum capacitance change (△ C), 40 ℃ when 20%, 105 ℃ is 20% of the time, the change in typically 10% to 15%. Niobium oxide in the more wide temperature characteristics within the scope of the more stringent, 55 ℃ △ C for the time 10%, 125C △ C when 12%, but usually the limit of 5% over this range.

Another temperature-related parameter is the ESR. In the niobium oxide capacitors, the better the filtering power applications, ESR at high temperature but will decrease. Importantly, niobium oxide capacitors used in virtually no wear Chuan device materials, so over time these parameters will remain within the limit.

Temperature and humidity

End-users is a key part of the manufacturing process is the printed circuit board attached device, usually reflow or wave solder. Niobium oxide technology is based on solid electrolyte systems, this system was installed with compatible epoxy molded in lead frame.

This structure has a moisture sensitivity, so can withstand a variety of lead-free reflow profile, surface mount production line that is no desiccant packaging or special handling. Niobium oxide capacitors niobium nitrogen medium, is Ta with the Department of Materials, with the same package assembly of standard EAI container size: A (3216), B (3528), C (6032), D class (7343) and E (7343H).

Improve reliability

Reliability of 0.2% per nominal 1000 hours, niobium oxide reliability failure rate is lower than standard commercial aluminum five times a factor. Another advantage is the low-calorie index of anode material, which makes it able to spread more power without overheating. However, all components need to be considered when used in the vicinity of the edge value of the case. This is the niobium oxide to provide another advantage. Compared with other electrolytic technology for the capacitor using niobium oxide cathode base material, resulting in a benign failure mode. If excessive stress will rise to the rated breakdown voltage, leakage parameter may be increased, but this still can be used as part of a capacitor circuit. In fact, the niobium oxide is the only non-produced non-electrical stress due to short-circuit failure mode of electrolysis.

Besides audio

There are many technical requirements for capacitors used in audio circuits (that is, low frequency / low noise), many of which have been discussed above. In these applications, requiring high frequency fidelity and noise-free filter, but are commonly used lower than the power required to filter capacitance. It opens that contains multi-layer ceramic chip capacitors, including new technology.

Typically, the Chinese side required capacitance, required class Ⅱ ceramic materials, such as the X7R, its circuit to produce a piezoelectric effect caused Dian noise. The niobium oxide technology not only from the piezoelectric effect of this, there is to apply the DC bias capacitance to maintain the advantage over (no voltage coefficient).