Mornsun 800W CRPS Server PSU Adopts Aishi LM Series 105°C Bus Capacitor — 450V 470µF Snap-In, 3000-Hour Life
2026-09-24 · Compiled by Best IT Parts from public industry reporting
Mornsun's LMS800-P12B is an 800W server power supply built to the standard CRPS form factor. The unit is rated for 100-240Vac input as well as 240V high-voltage DC input, carries 80 PLUS Platinum efficiency certification and supports PMBus/I2C communication for monitoring input and output voltage and current. A teardown focused on the high-voltage DC bus — the rail between the digital PFC stage and the downstream LLC resonant converter — found a single Aishi aluminium electrolytic capacitor in the input filtering position, specified at 450V / 470µF.
The part is from Aishi's LM series, model ELM2WM471R50KT, a 35 x 50 mm snap-in type with ±20% capacitance tolerance and a 3000-hour rated life at 105°C. The series covers 160V to 550V DC rated voltages, works from -25°C to +105°C, keeps the -25°C to +20°C impedance ratio within 4x and meets RoHS requirements. It sits alongside a PFC boost inductor and a film filter capacitor supporting the same bus.
The capacitor is mounted vertically on a small mezzanine board rather than directly on the main PCB, a placement common in CRPS designs because it clears the heatsink and boost inductor inside a height-constrained enclosure. The input end of the board concentrates the fuse, Y capacitors, a varistor and an X2 safety capacitor.
The engineering rationale is bus behaviour under load. As output approaches full load, or when the load steps, the PFC bus shows its largest dips and overshoots, and sufficient bus capacitance releases stored energy quickly enough to hold the rail inside limits. On a capacitor running continuously at 105°C, ripple current capability sets internal temperature rise and therefore real service life. For server power buyers sourcing replacement electrolytics, the notable point is that a Chinese-made part now occupies the high-voltage filter position of an 800W Platinum-rated CRPS unit, a slot traditionally held by imported components.
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Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.