TRX SMD Y1 Capacitors in Four Mornsun CRPS Server PSUs — TMY1102M and TMY1222M From 320W to 2000W
2026-09-23 · Compiled by Best IT Parts from public industry reporting
CRPS has become the common redundant server power supply standard, combining hot-swap, N+1 redundancy and PMBus digital monitoring in a standardised envelope, with unit ratings now reaching 2000W. That density puts safety components such as Y capacitors, which bridge the primary and secondary sides, under pressure to suppress common-mode interference on ever smaller PCB areas.
Teardowns show TRX SMD-Y1 ceramic AC safety capacitors used in four Mornsun CRPS server power supplies spanning 320W to 2000W and covering 80 PLUS Gold and Platinum levels. Two part numbers appear: TMY1102M at 1000pF and TMY1222M at 2200pF, both ±20% tolerance in a 7854 package with a 400V AC rating. All are mounted on the underside of the PCBA module, where layout space is most constrained.
The 320W LMS350-G12B (Gold) accepts mains AC and 240V HVDC and provides +12.2V/29A plus a +12.0VSB/3A standby rail, with PMBus monitoring through a BMC covering fault alarms and black box logging, 199.15mm overall length including the gold finger and about 635g; it uses TMY1102M, a Texas Instruments C2000 digital MCU for PFC control and an NXP TEA2095 synchronous rectification controller. The 550W LMS550-P12B (Platinum) delivers +12.2V/45A with 12V/3A standby, weighs about 724g and uses TMY1222M, with a SVS20N60P7D2 PFC switch, a G3S06504C SiC PFC rectifier, an OSG65R200FEF LLC switch and the same TEA2095.
The 800W LMS800-P12B (Platinum) is rated +12.2V/65A at about 782g with TMY1222M, a TMS320F2800137 PFC controller, an OSG65R070HT3F PFC switch, a G3S06506A SiC rectifier and an SFS04R02GF synchronous rectifier. The 2000W LMS2000-P12B accepts 90-264V AC or 240V HVDC, outputs +12.2V/163A, weighs about 936g and uses three TMY1102M devices plus two through-hole Y capacitors at the input; its PFC stage runs a TMS320F2800137PM controller with two OSG60R060HT3F switches and SFSE2R005UGF rectifiers.
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Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.