Skip to main content

Seasonic Prime Ultra Titanium 1000W PSU Review: Quiet Dominance

Teardown & Component Analysis

Before proceeding with this page we strongly encourage you to a look at our PSUs 101 article, which provides valuable information about PSUs and their operation, allowing you to better understand the components we're about to discuss.

General Data
Manufacturer (OEM)Seasonic
Platform ModelPrime Titanium
Primary Side
Transient Filter2x Y caps, 3x X caps, 2x CM chokes, 1x MOV
Inrush ProtectionNTC thermistor & relay
Bridge Rectifier(s)2x Vishay LVB2560 (600V, 25A @ 105°C)
APFC MOSFETs2x Infineon IPP60C7099 (650V, 14A @ 100°C, 0.099Ω)
APFC Boost Diode1x STPSC10H065D (600V, 10A @ 135°C)
Hold-up Cap(s)1x Hitachi (400V, 470uF, 2000h @ 105°C, HU) 1x Hitachi (400V, 820uF, 2000h @ 105°C, HU)
Main Switchers4x Infineon IPP50R140CP (550V, 15A @ 100°C, 0.14Ω)
Drivers For Main Switchers2x Silicon Labs Si8230BD
APFC ControllerON Semiconductor NPC1654
Switching ControllerChampion CM6901
TopologyPrimary side: Full-bridge & LLC resonant converter Secondary side: Synchronous rectification & DC-DC converters
Secondary Side
+12V MOSFETs6x R638
5V & 3.3VDC-DC Converters: 6x Infineon BSC0906NS PWM Controller: APW7159
Filtering CapacitorsElectrolytics: Nippon Chemi-Con (1-5000h @ 105°C, KZE), Nippon Chemi-Con (105°C, W), Nippon Chemi-Con (4000-10,000h @ 105°C, KY), Chemi-Con (5-6000h @ 105°C, KZH), Rubycon (3-6000h @ 105°C, YXG) Polymers: FPCAP, Nippon Chemi-Con
Supervisor ICWeltrend WT7527V (OVP, UVP, OCP, SCP, PG ) & AS393M
Fan ModelHong Hua HA13525M12F-Z (135mm, 12V, 0.36A, 1800 RPM, fluid dynamic bearing)
5VSB Circuit
Buck ConverterLeadtrend LD7750R
RectifiersSTMicroelectronics STU6N65K3 (650V, 3A @ 100°C, 1.3Ω) Infineon BSC0906NS (30V, 40A @ 100°C, 4.5mΩ)
-12V Circuit
Buck ConverterLite-On LSP5523 (3A max output current )

Seasonic's component selection and design focus on delivering the highest efficiency possible while keeping noise output low. A full bridge topology and LLC resonant converter are used on the primary side. On the secondary side, FETs regulate the +12V rail and a couple of DC-DC converters handle the minor rails.

There is a dedicated buck converter IC for the -12V rail's rectification, rather than a plain diode. Although this rail is insignificant, it can still kill a PSU, so it's nice to see a proper IC used for its generation, enabling overload protection.

Here are some photos of the PSU’s major parts:

Image 1 of 37

Image 2 of 37

Image 3 of 37

Image 4 of 37

Image 5 of 37

Image 6 of 37

Image 7 of 37

Image 8 of 37

Image 9 of 37

Image 10 of 37

Image 11 of 37

Image 12 of 37

Image 13 of 37

Image 14 of 37

Image 15 of 37

Image 16 of 37

Image 17 of 37

Image 18 of 37

Image 19 of 37

Image 20 of 37

Image 21 of 37

Image 22 of 37

Image 23 of 37

Image 24 of 37

Image 25 of 37

Image 26 of 37

Image 27 of 37

Image 28 of 37

Image 29 of 37

Image 30 of 37

Image 31 of 37

Image 32 of 37

Image 33 of 37

Image 34 of 37

Image 35 of 37

Image 36 of 37

Image 37 of 37

The following video shows the SSR-1000TR’s internals.


MORE: Best Power Supplies


MORE: How We Test Power Supplies


MORE: All Power Supply Content

Aris Mpitziopoulos
Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.