Figure 1. KEMET A700 Aluminum Organic Capacitor (AO-CAP) Basic Construction
Figure 2. Aluminum Element Foil Photo
Several element foils are stacked and positioned within the capacitor construction, a schematic of the construction is shown in Figure 3. Due to its construction, it has very low ESR capabilities.
Figure 3 – Schematic Construction of A700 Plus Performance Capacitor
AO-CAP® may be operated at steady-state voltages up to 100% of rated voltage without the need to de-rate. This characteristic is due to the low-stress interface with the dielectric and polymer counter electrode and is a favorable reliability parameter.
Since there is no liquid electrolyte, the A700 offers long operational lifetimes, low ESR, and high operational temperatures.
The ESR in frequency shows a broader curve with values < 10mOhm and minimal variation with temperature. Go here to access the K-SIM for A700 .
Enhancements to the design and selected material upgrades were introduced to expand the 125ºC Life Endurance at rated voltage up to 3000h. In addition, the Storage Endurance was also extended to 125ºC.
The initial product portfolio is limited to one part number suitable to support low voltage power rails in typical DC/DC converters, servers, telecommunications, displays, and industrial applications. The new part numbers are described in Table 1a and the AO-CAP selection guide summary in Table 1b.
Table 1a. A700 Plus Performance (125ºC / 3000h) Series Initial Product Portfolio Offering
Table 1b. AO-CAP Selection Guideline Table
The high 470 μF capacitance combined with the low and stable ESR contributes to the application's performance, allowing a higher ripple.
The KEMET A700 Plus Performance qualification procedures specify tight acceptance criteria for capacitance drift, dissipation factor, ESR, and DCL, as described in Table 2.
Table 2. A700 Plus Performance (125ºC / 3000h) - Qualification Acceptance Criteria
In addition, current inline verification, such as five-time surface mount reflow at 260ºC according to the JEDEC Std 020D, reveals excellent ESR stability, Figure 4.
Figure 4. A700 Plus Performance – Inline 5x 260ºC SMT – ESR Stability Verification
The new A700 Plus Performance AO-CAP brings the Polymer Aluminum capability to extreme extended lifespan application conditions. Contact a sales representative to help find a solution to your design challenge.