6 Best Alternatives to the S-Union 180W Lenovo Replacement TFX (2026)
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The S-Union 180W Lenovo Replacement TFX Power Supply delivers reliable 180W output in a compact TFX form factor. It matches the exact dimensions and connector layout required for Lenovo M410, M510, and S500 systems. This makes it a solid choice for users needing a direct OEM-style replacement. However, you might seek S-Union Upgraded HK280 72PP 180W Power Alternatives for different reasons. Some builders need higher wattage to support more components. Others prefer better efficiency ratings or quieter operation from larger fans. You may also want a different brand for specific warranty terms or availability.
We selected these alternatives because their specifications overlap with the original unit. Every option here uses the TFX form factor, ensuring physical compatibility with your chassis. The list includes units with varying wattages, from 210W to 500W. Some models offer 80 Plus Gold efficiency for improved power management. Others focus on compact dimensions or specific connector types. This guide helps you compare specs like size, output, and efficiency to find the right fit for your build.
How each alternative compares
BackPlanePro 300W TFX Power Supply
The BackPlanePro 300W TFX unit offers nearly double the power of the 180W S-Union model. It features active PFC for better efficiency at lower loads and includes a silent cooling fan. The physical dimensions differ slightly, with a width of 2.56 inches compared to the S-Union's 2-inch width. You may need to verify case clearance before installation. This option suits Dell Inspiron SFF users who need more headroom for components. The S-Union remains the precise fit for Lenovo systems requiring exact OEM dimensions and connector layouts. Choose the BackPlanePro if you prioritize wattage and efficiency over strict Lenovo compatibility.
Apevia 300W TFX Power Supply
The Apevia 300W TFX power supply provides a significant wattage jump from the 180W S-Union unit. Its dimensions are wider at 3.23 inches and shorter at 2.5 inches in height. This change in profile may affect fitment in tight Lenovo chassis. The Apevia model lacks the quiet operation found in larger fans, which might result in more audible noise under load. It serves users needing a step up from 180W in standard TFX cases. The S-Union is better for those needing exact Lenovo M410 or M510 compatibility. Select the Apevia if you have a flexible case and require higher power output.
Lenovo ThinkCentre 210W TFX Power Supply
The Lenovo ThinkCentre 210W TFX PSU is an OEM replacement with slightly higher wattage than the 180W S-Union. Its dimensions are notably different, measuring 9.7 inches in length and 1.1 inches in width. This form factor is not a direct drop-in replacement for the S-Union's compact 2x6x4 inch design. It is designed specifically for ThinkCentre TFX systems. The S-Union model is the correct choice for M410, M510, and S500 desktops. Pick the Lenovo unit only if you are upgrading a ThinkCentre system and need a genuine OEM part with 210W output.
SilverStone 500W Gold TFX Power Supply
The SilverStone 500W Gold TFX power supply delivers substantial power and high efficiency for users upgrading beyond 180W limits. It features an 80 Plus Gold certification for stable output and quiet operation. The unit is wider at 3.4 inches and longer at 6.9 inches compared to the S-Union. This size increase requires a case with sufficient depth and width. It suits builders who prioritize performance and efficiency over compact size. The S-Union remains the ideal choice for Lenovo systems requiring exact 180W TFX specs. Choose the SilverStone if you have a compatible case and need significant power headroom.
Be Quiet! TFX Power 3 TFX Power Supply
The Be Quiet! TFX Power 3 is a compact option designed for small form factor builds. It weighs 3.09 pounds and measures 3.35 inches in width and 6.89 inches in length. These dimensions differ from the S-Union's 2-inch width and 4-inch length. The model prioritizes physical dimensions and quiet operation over listed power output details in the provided data. It suits users who value low noise in small cases. The S-Union is the better fit for Lenovo M410 and M510 systems due to exact dimensional compatibility. Select the Be Quiet! unit if you have a flexible case and prioritize silence.
MAXROB 250W TFX Power Supply
The MAXROB 250W TFX power supply fits users upgrading from 180W Lenovo units who need more headroom. It is a practical drop-in replacement for FSP-based builds. The wattage increase to 250W provides extra capacity for components. The model uses the FSP250-50SAV(PF) design, which may differ in connector layout from the S-Union's 10Pin + 4Pin setup. Verify compatibility with your specific Lenovo model before purchase. The S-Union ensures exact fit for M410, M510, and S500 systems. Choose the MAXROB if you need more power and confirm your system supports this FSP-based design.
Quick picks
Our 7 picks
S-Union 180W Lenovo Replacement TFX Power Supply
Best for: Lenovo M410, M510, S500 replacement
- Wattage
- 180W
- Warranty
- 18 Months
- Form Factor
- TFX
- Dimensions
- 4 × 2 × 6 inches
View on Amazon: S-Union 180W Lenovo Replacement TFX Power Supply Affiliate link
This S-Union HK280-72PP is a 180W TFX power supply designed for specific Lenovo desktops. It features a 10-pin plus 4-pin connector layout and supports 100-240V input. The unit measures 4 by 6 by 2 inches. It includes a 18-month warranty. This model suits you if you need a direct replacement for older Lenovo systems like the M410 or S500 series.
Pros
- 180W output capacity
- TFX form factor fits small cases
- 10-pin plus 4-pin connector
- 18-month warranty coverage
Cons
- Lower wattage than 300W alternatives
- Fixed cable configuration
- No 80 Plus efficiency certification listed
Good fit if
- You own a Lenovo M410, M510, or S500
- You need a 180W TFX replacement
- You want a 18-month warranty
Skip if
- You require more than 180W of power
- You need a 300W or higher unit
- You have a Silverstone 500W Gold PSU
Verdict: S-Union 180W TFX PSU for Lenovo provides the exact specs needed for compatible Lenovo desktops. It fits you if you need a reliable 180W TFX replacement with warranty support.
BackPlanePro 300W TFX Power Supply
Best for: Dell Inspiron SFF systems needing 300W
- Wattage
- 300W
- Fan Size
- 80mm
- Warranty
- One Year
- Form Factor
- TFX
- Dimensions
- 6.89 × 2.56 × 3.35 inches
- Weight
- 3 pounds
View on Amazon: BackPlanePro 300W TFX Power Supply Affiliate link
This BackPlanePro unit is a 300W TFX power supply designed for slim desktop cases like the Dell Inspiron 530s. It features an 80mm silent fan and active PFC for stable power delivery. The build measures 6.89 by 2.56 by 3.35 inches and weighs 3 pounds. It offers a one-year warranty. You should choose this if you need a reliable replacement for older SFF systems requiring a 300W TFX form factor.
Pros
- 300W output capacity
- 80mm silent cooling fan
- Active PFC support
- One-year warranty coverage
Cons
- Shorter one-year warranty compared to competitors
- Heavier at 3 pounds
- No 80 Plus efficiency certification listed
Good fit if
- You need a 300W TFX replacement for a Dell Inspiron SFF PC
- You prefer a unit with active PFC for stable voltage
- You want a silent 80mm fan for low noise operation
Skip if
- You require higher than 300W power output
- You need an 80 Plus Gold certified unit for efficiency
- You are upgrading a Lenovo ThinkCentre system needing 210W or less
Verdict: BackPlanePro 300W TFX Power Supply fits users needing a robust 300W upgrade for Dell Inspiron SFF systems who value active PFC and silent cooling over efficiency certifications.
Apevia 300W TFX Power Supply
Best for: TFX builds needing 300W power
- Wattage
- 300W
- Fan Size
- 80mm
- Form Factor
- TFX
- Dimensions
- 6.75 × 3.23 × 2.5 inches
- Weight
- 2.1 pounds
View on Amazon: Apevia 300W TFX Power Supply Affiliate link
The Apevia TFX-AP300W delivers 300W of power in a standard TFX form factor. It features an 80mm fan for forced air ventilation and supports 115-230V AC input. This unit provides +12V output at 20A, making it suitable for systems requiring moderate power. Its compact dimensions fit into small form factor cases. You get a reliable upgrade over lower wattage options like the 180W S-Union.
Pros
- 300W total power output
- 80mm cooling fan
- 20A on +12V rail
- Standard TFX size
Cons
- Single 80mm fan may run louder than larger units
- Fixed cable design limits cable management
- No 80 Plus efficiency certification listed
Good fit if
- You need more power than 180W for your TFX build
- You require a standard 300W replacement for older systems
- You are upgrading from a lower wattage TFX unit
Skip if
- You need silent operation with a larger fan
- You require modular cabling for tight cases
- You need high efficiency certification like 80 Plus Gold
Verdict: Apevia 300W TFX Power Supply offers solid 300W output for users needing a step up from 180W units. It fits standard TFX cases well but lacks the quiet operation of larger fans.
Lenovo ThinkCentre 210W TFX Power Supply
Best for: Lenovo ThinkCentre TFX replacements
- Wattage
- 210W
- Form Factor
- TFX
- Dimensions
- 1.1 × 9.7 × 6.5 inches
View on Amazon: Lenovo ThinkCentre 210W TFX Power Supply Affiliate link
This Lenovo 210W TFX power supply replaces the S-Union 180W unit for ThinkCentre systems. It features a 210W output and standard TFX dimensions of 9.7 by 6.5 by 1.1 inches. You get a direct OEM replacement that fits the same form factor. It supports 100-240Vac input for broad voltage compatibility. This unit is designed specifically for Lenovo desktops requiring this specific wattage and shape.
Pros
- 210W power output exceeds the 180W baseline
- Standard TFX form factor fits original chassis
- 100-240Vac input range for global use
- OEM Lenovo sparepart for direct compatibility
Cons
- Higher wattage may not fit smaller 180W cases
- Fixed cable configuration limits flexibility
- No 80 Plus efficiency rating listed
Good fit if
- You need a direct Lenovo ThinkCentre replacement
- Your case supports TFX form factors
- You require slightly more power than 180W
Skip if
- You need 80 Plus Gold efficiency
- Your system requires a 500W unit
- You want modular cable management
Verdict: Lenovo 210W TFX PSU provides a reliable OEM upgrade for ThinkCentre desktops. It fits users who need a direct replacement with slightly higher wattage than the 180W standard.
SilverStone 500W Gold TFX Power Supply
Best for: Upgrading to higher wattage TFX builds
- Wattage
- 500W
- Efficiency Rating
- 80 PLUS Gold
- Modularity
- Fixed Cable
- Fan Size
- 80mm
- Form Factor
- TFX
- Dimensions
- 6.9 × 3.4 × 2.6 inches
View on Amazon: SilverStone 500W Gold TFX Power Supply Affiliate link
This SilverStone unit delivers 500W of continuous power in a standard TFX form factor. It holds 80 PLUS Gold efficiency certification and operates silently with an 80mm fan rated at 18 dBA. The fixed cables and multiple protection circuits ensure stable performance for daily use. You get reliable output even at high temperatures. It is a robust upgrade for systems needing more headroom than the 180W options.
Pros
- 500W continuous power output
- 80 PLUS Gold efficiency rating
- Silent 80mm fan operation
- Multiple protection circuitry included
Cons
- Fixed cables limit cable management flexibility
- Larger physical dimensions than 180W units
- Higher wattage may exceed small chassis limits
Good fit if
- You need more than 180W of power
- You want high efficiency for lower heat
- You are building a standard TFX system
Skip if
- You require modular cables for tight spaces
- You are replacing a small 180W unit
- You have a very compact chassis
Verdict: SilverStone 500W TFX Gold PSU offers substantial power and efficiency for users upgrading beyond 180W limits. It suits builders who prioritize stable output and quiet operation over compact size.
Be Quiet! TFX Power 3 TFX Power Supply
Best for: small form factor builds
- Form Factor
- TFX
- Dimensions
- 6.89 × 3.35 × 2.56 inches
- Weight
- 3.09 pounds
View on Amazon: Be Quiet! TFX Power 3 TFX Power Supply Affiliate link
This Be Quiet! TFX power supply measures 6.89 by 3.35 by 2.56 inches. It weighs 3.09 pounds. The unit is black. It fits standard TFX cases. You should choose this if you need a compact form factor for a small build. The dimensions ensure it fits in tight spaces. The weight suggests a solid internal construction. It is a straightforward replacement unit.
Pros
- Standard TFX form factor
- Compact 6.89 inch length
- Black color scheme
- 3.09 pound weight
Cons
- No wattage rating listed in data
- No 80 Plus efficiency certification mentioned
- No cable length or type specified
Good fit if
- You need a TFX form factor
- You are building in a small case
- You want a compact power supply
Skip if
- You require a specific wattage rating
- You need high efficiency certification
- You prefer a different color
Verdict: Be Quiet! TFX 3.35 in 3.09 lb is a compact option for small builds. It suits users who prioritize physical dimensions over listed power output.
MAXROB 250W TFX Power Supply
Best for: FSP-based TFX system upgrades
- Wattage
- 250W
- Form Factor
- TFX
View on Amazon: MAXROB 250W TFX Power Supply Affiliate link
The MAXROB unit is a 250W TFX power supply designed as a replacement for FSP models like the FSP300-60GHT. It fits the standard TFX form factor, making it compatible with small form factor cases that require this specific layout. You should consider this if you need a direct swap for older FSP-based systems. It provides slightly more wattage than the 180W Lenovo units but less than the 300W alternatives on this list.
Pros
- 250W output capacity
- TFX form factor
- Compatible with FSP model replacements
Cons
- Lower wattage than 300W competitors
- No 80 Plus efficiency rating listed
- Fixed cable configuration
Good fit if
- You need a TFX PSU for an FSP-based system
- You want more power than 180W but less than 300W
- You are replacing a failed FSP250-50SAV unit
Skip if
- You require 80 Plus Gold efficiency
- You need a 500W power supply
- You are building a Dell Inspiron 530s system
Verdict: MAXROB 250W TFX Power Supply fits users upgrading from 180W Lenovo units who need a bit more headroom without jumping to 300W. It is a practical drop-in replacement for FSP-based builds.
Specifications side by side
| Spec | S-Union 180W Lenovo Replacement TFX Power Supply | BackPlanePro 300W TFX Power Supply | Apevia 300W TFX Power Supply | Lenovo ThinkCentre 210W TFX Power Supply | SilverStone 500W Gold TFX Power Supply | Be Quiet! TFX Power 3 TFX Power Supply | MAXROB 250W TFX Power Supply |
|---|---|---|---|---|---|---|---|
| Wattage | 180W | 300W | 300W | 210W | 500W | not stated | 250W |
| Efficiency Rating | not stated | not stated | not stated | not stated | 80 PLUS Gold | not stated | not stated |
| Modularity | not stated | not stated | not stated | not stated | Fixed Cable | not stated | not stated |
| Fan Size | not stated | 80mm | 80mm | not stated | 80mm | not stated | not stated |
| Warranty | 18 Months | One Year | not stated | not stated | not stated | not stated | not stated |
| Form Factor | TFX | TFX | TFX | TFX | TFX | TFX | TFX |
| Size | not stated | not stated | TFX 300W | not stated | 500W | not stated | not stated |
| Dimensions | 4 × 2 × 6 inches | 6.89 × 2.56 × 3.35 inches | 6.75 × 3.23 × 2.5 inches | 1.1 × 9.7 × 6.5 inches | 6.9 × 3.4 × 2.6 inches | 6.89 × 3.35 × 2.56 inches | not stated |
| Weight | not stated | 3 pounds | 2.1 pounds | not stated | not stated | 3.09 pounds | not stated |
| Model | HK280-72PP | LYSB00CXAUQJK-CMPTRACCS | TFX-AP300W | 7823903000 | SST-TX500-G | BN323 | FSP250-50SAV(PF) TFX 250W |
| Color | not stated | Grey | Black | not stated | black (lead-free paint) | Black | not stated |
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Frequently asked questions
What is the best 180W TFX power supply for Lenovo desktops?
The S-Union 180W Lenovo Replacement TFX Power Supply is the top choice. It provides the exact specs needed for compatible Lenovo models like the M410 and M510. The unit measures 2 by 6 by 4 inches. It fits standard TFX cases perfectly. You get a reliable direct replacement with warranty support.
Can I use a 300W TFX PSU instead of a 180W unit?
Yes, you can use higher wattage TFX units like the BackPlanePro 300W or Apevia 300W. These offer more power headroom for Dell Inspiron or general TFX builds. The BackPlanePro features active PFC and silent cooling. The Apevia is slightly wider at 3.23 inches but fits standard TFX cases well.
Does the Lenovo ThinkCentre 210W TFX fit the same space as the S-Union?
The Lenovo ThinkCentre 210W TFX PSU is an OEM upgrade for ThinkCentre desktops. It offers slightly higher wattage than the 180W standard. Note that its dimensions differ, measuring 9.7 by 6.5 by 1.1 inches. Verify your case clearance before installation, as the length and width vary from typical compact TFX units.
Is there a high-efficiency TFX power supply option available?
The SilverStone 500W Gold TFX Power Supply is the best 80 Plus Gold option. It offers substantial power and efficiency for upgrades beyond 180W limits. The unit measures 3.4 by 2.6 by 6.9 inches. It suits builders who prioritize stable output and quiet operation over the smallest possible physical size.
Which TFX PSU is best for small form factor builds?
The Be Quiet! TFX Power 3 is a compact option for small builds. It measures 3.35 by 2.56 by 6.89 inches and weighs 3.09 pounds. This unit suits users who prioritize physical dimensions and quiet operation. It is a practical choice for tight cases where space is limited.
What is a good mid-range TFX upgrade from 180W?
The MAXROB 250W TFX Power Supply is a practical drop-in replacement. It fits users upgrading from 180W Lenovo units who need more headroom without jumping to 300W. It is based on FSP designs. This makes it a suitable alternative for FSP-based builds requiring a modest power increase.