Part Analysis
| General Data | |
| Manufacturer (OEM) | Seasonic |
| PCB Type | Double-Sided |
| Primary Side | |
| Transient Filter | 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV |
| Inrush Protection | 1x NTC Thermistor MF72 5D-20L (5 ohm) & Relay |
| Bridge Rectifier(s) |
2x GBU1508 (800V, 15A @ 40°C)
|
| APFC MOSFETs |
2x Alpha & Omega AOB190A60CL (600V, 12A @ 100°C, Rds(on): 0.19Ohm)
|
| APFC Boost Diode |
1x Infineon IDK08G65C5 (650V, 8A @ 145°C)
|
| Bulk Cap(s) |
1x Nichicon (400V, 560uF, 2,000h @ 105°C, GG(M))
|
| Main Switchers |
4x Great Power GPT130N50X (500V, 4.5A @ 25°C, Rds(on): 1.55Ohm)
|
| Resonant Controller |
Champion CU6901VPA
|
| APFC Controller |
Champion CM6500UNX
|
| Topology |
Primary side: APFC, Full-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | 4x Nexperia PSMN1R4-40YLD (40V, 214A @ 100°C, Rds(on): 1.4mOhm) |
| 5V & 3.3V | DC-DC Converters: 6x Nexperia PSMN4R0_30YLD (30V, 95A @ 100°C, Rds(on): 4mOhm) PWM Controller(s): Anpec APW7159C |
| Filtering Capacitors | Electrolytic: 3x Nichicon (2-5,000h @ 105°C, HD), 1x Nippon Chemi-Con (1-5,000h @ 105°C, KZE), 5x Rubycon (3-6,000h @ 105°C, YXG) 2x Rubycon (6-10,000h @ 105°C, ZLH) Polymer: 7x Nippon Chemi-Con, 16x FPCAP |
| Supervisor IC | Weltrend WT7527RA (OVP, UVP, OCP, SCP, PG) |
| Fan Controller | Nuvoton M031FB0AE |
| Fan Model | Hong Hua HA13525H12F-Z (135mm, 12V, 0.50A, Fluid Dynamic Bearing Fan) |
| 5VSB | |
| Rectifier |
DK DK5V45R10S (45v, 10mOhm)
|
| Standby PWM Controller |
Excelliance MOS EM8569C
|
Despite the small PCB, plenty of space is available, and the distance between parts is large to allow for enhanced airflow. The large vertical PCBs on the sides allow for an uncrowded PCB. One holds the APFC converter and the main FETs, while the other daughterboard holds both DC-DC converters that generate the minor rails. Seasonic used surface-mounting FETs with tiny heatsinks since the PCB also cools them. This is an interesting design to have a vertical board holding a significant part of the PSU’s primary side. Speaking of the primary side, a full-bridge topology is used for enhanced reliability and increased efficiency. On the secondary side, the 12V FETs are installed on the top PCB side, so they come in direct contact with the fan’s airflow.
Overall, the soldering quality is good, and all the parts that Seasonic used are of high quality, including Nichicon, Rubycon, Chemi-Con, and FPCAP capacitors, along with Alpha & Omega and Nexperia FETs. Moreover, the cooling fan is by Hong Hua, which has been among the most popular fan manufacturers in the PSU market in recent years, and for good reason.
The fan is digitally controlled by an MCU, which is optimal, but you still have to program it accordingly to have a good fan speed profile. Moreover, I would like to see MCUs controlling other parts of the PSU as well.
Hello.
I see that inrush current is almost 200A at 230V… is that real? Would this much power trip circuit breakers in the house or damage anything?
Is this PSU safe to use? I have it but now im scared to turn it on…
it is real yes. It is for a very short period, so it doesn’t trip the breaker.
Thank you for your fast response.
Does this high inrush current do anything to the lifespan of the PSU or PC?
I usually power off the PSU at night and power on in the morning to avoid the bright LED lights in my room and now im worried.
I wish i read your review on this PSU before i bought it. Im very disappointed in Seasonic.
It is hard to drain the APFC bulk caps completely. We follow a special procedure to do so. But yeah, they could use a larger NTC thermistor to lower it because we also have Murphy’s laws.
Hi
Thanks for the valuable work, there was an older ATX 3.0 version:
https://seasonic.com/atx3-focus-gx/
From other reviews seems this V3 version is the most reliable one, dodn’t you review that by chance? Best.
I have the V3 in one of my systems, it’s a solid psu. Aris might not have reviewed it but Anandtech did
https://www.anandtech.com/show/21101/the-seasonic-focus-gx-850-atx-3-0-psu-review-cool-quiet-and-robust
Hi
What about SeaSonic Focus GX-750 ATX2 version?
Does it also have those issues mentioned in the cons section?
And those listed as cons can be damaging the other parts of the system?
Thanks
I don’t have a clue what they fixed and what not, sorry. Seasonic barely sends me any samples to review.
Thank you for the review. You have helped me find good series of Kolink PSUs which have been proving good for the price. Fractal seems to be a very good alternative to Corsair, for similar prices.
I have been keeping away from Seasonic units due to lack of protection features.
I had both S12-IIs and M12-IIs (two units each) that only had a simple form of SCP protection. If there is any resistance in the path (as in a broken MOSFET), it will keep draining until one of this happens:
– Something blows up due to melting/burning shorted component.
– The PSU shuts down due to undervoltage protections (which from reviews of this platform seem to be set way too low).
Despite this, Seasonic claims that all protections work despite multiple of evidence from reviews that this platform was broken.
This was 10y ago and it has cost me hardware that was plugged into the damaged parts (which I didn’t knew had failed). A shame because otherwise they are very reliable, mostly silent PSUs.
You especially cannot run Seasonic PSUs unattended, as many models have proven to be a fire hazard due to non-functioning ATX protections like described in this review. Stay away!
Forgot to add that I had a 3rd Seasonic made XFX Core PSU that had the same issues. So, that is quite the track record of not doing QC properly.
Any news about the 750w protection features?
I think you were right and a lot of people who read your review are wondering if the retail 750w model should be considered when making a purchase.
Thanks a lot for all the amazing work.
Still, no new fixed sample from Seasonic.
Would you consider testing the Super Flower Zillion FG ATX3.1/PCIe 5.0 power supplies? I’ve recently stumbled across them as they are currently on sale and was wondering if they were good.
I will review them in the future!
Aris you should review the SuperFlower Leadex III ATX3.0