Considering using 10 capacitors of each type the RMS current needed per capacitor is 54.5 A

• Self-heating of capacitor: ΔT= (54.5 A)² ∙ 1.3 mΩ ∙ 4.2 K/W = 16.2 K
• B25690A0737K901: 
  • Hotspot temperature: T_amb + ΔT = +65 °C + 16.2 K = +81.2 °C
  • Voltage ratio: 800 V / 900 V = 0.89
  • Service life: 134 000 hours

• B25695E0737K901: 
  • Hotspot temperature: T_amb + ΔT = +65 °C + 16.2 K = +81.2 °C
  • Voltage ratio: 800 V / 900 V =0.89
  • Service life: 175 000 hours

Only the MKP DC HT (B25695) meets the customer´s specification of 170 000 hours.

• Using B25690:
  • 10 components in parallel of the B25690A0737K901 are needed (current per piece = 54.5 A)
  • Self-heating of capacitor: ΔT= (54.5 A)² ∙ 1.3 mΩ ∙ 4.2 K/W = 16.2 K
  • Hotspot temperature: T_amb + ΔT = +65 °C + 16.2 K = +81.2 °C
  • Voltage ratio: 800 V / 900 V = 0.89
  • Service life: 134 000 hours 
• Using B25695:
  • 9 components in parallel of the B25695E0737K901 are needed (current per piece = 60.5 A)
  • Self-heating of capacitor: ΔT= (60.5 A)² ∙ 1.3 mΩ ∙ 4.2 K/W = 20 K
  • Hotspot temperature: +65 °C + 20 K = +85 °C
  • Voltage ratio: 800 V / 900 V = 0.89
  • Service life: 128 000 hours

MKP DC HT (B25695) meets the customer´s specification of 125 000 hours using 9 pieces instead of 10 pieces of the B25690.

Using the B25695 series makes the DC link smaller and lighter. Considering a normal operation of 800 V instead of the nominal 900 V, the B25695 could handle 74,1 A since +95 °C can be allowed, which is 36% more current considering the derating. These worst-case conditions could be used for around 10 000 hours.