In industrial systems such as IPC controllers, compact workstations, storage appliances, and communication equipment, the power supply is more than a basic component.
Electrical noise, start-up behavior, and compliance documentation can influence system stability and project approval timelines. Ripple can affect sensitive I/O electronics, insufficient hold-up time may lead to resets, and missing documentation can delay certification or customer audits.
The FSP400-50UCB is designed for integration in 1U rack systems and industrial environments where space constraints, predictable electrical behavior, and documentation availability are relevant for system development and deployment.
Why a 400W 1U Power Supply Matters in Industrial Systems
In many industrial platforms, the power budget is only one design constraint. System engineers must also consider:
- Limited mechanical space (1U height restrictions)
- Thermal management within dense rack systems
- Electrical noise and transient behavior
- Compliance documentation required for customer audits or certification processes
While desktop power supplies may be sufficient for prototypes, production systems typically require predictable behavior under cross-load conditions, defined start-up signaling, and traceable compliance documentation.
The FSP400-50UCB addresses these requirements with:
- Standard 1U industrial form factor
- Total output power up to 400 W
- Multiple output rails used in industrial ATX platforms
- Wide AC input range (90–264 Vac)
The datasheet positions the unit for applications including industrial PCs, workstations, storage systems, and communication platforms.
FSP400-50UCB Overview
Typical electrical rails include:
- +12 V
- +5 V
- +3.3 V
- –12 V
- +5VSB standby rail
- optional –5 V
These rails support many ATX-based industrial motherboard and backplane configurations used in IPC and embedded workstation systems.
The specification also includes operating limits such as temperature range and altitude, which are relevant when deploying systems in industrial environments.
Key Electrical Characteristics
Output Rails and Cross-Load Behavior
In industrial IPC and storage systems, rail distribution and ripple/noise are not just secondary parameters. They can influence stability, I/O behavior, and performance margin in real enclosures with mixed loads and long harnesses.
FSP400-50UCB provides multiple rails commonly required by IPC, workstation, and storage platforms. Typical integration considerations include:
- +12 V as the primary rail for CPUs, drives, and PCIe cards in modern platforms
- +5 V and +3.3 V for legacy I/O, backplanes, and certain controller boards (often limited by a combined power cap)
- +5VSB for standby functions and remote power control
- –12 V and optional –5 V for compatibility requirements in specialized or legacy deployments
Practical note: The datasheet states that the combined +3.3 V and +5 V output shall not exceed 90 W. Validate cross-load conditions early, especially when powering backplanes or legacy peripheral loads.
Input Range, Efficiency and Inrush Considerations
Industrial installations may operate with variable mains conditions, generator-backed sites, and mixed 115 V / 230 V regions. FSP400-50UCB supports a wide input range (90–264 Vac) and 47–63 Hz, and meets 80 PLUS Bronze efficiency requirements.
The specification includes efficiency at different load points and inrush current values for cold starts. These values can support planning for breaker sizing, power sequencing, and multi-PSU rack deployments.
If your rack uses staged start-up or remote control, PS_ON# control logic can be used to reduce peak simultaneous inrush when multiple systems share an upstream PDU.
Environmental and Reliability Parameters
The datasheet lists operating conditions relevant to industrial deployments:
- Operating temperature: 0 °C to 50 °C
- Humidity: high relative humidity (non-condensing)
- Altitude: operation up to 5,000 m
- MTBF: stated as 100,000 hours at 25 °C at maximum output load
TPS-Shop also notes 100% Hi-pot testing and burn-in at 50 °C. If needed for internal documentation, reference the related TPS-Shop statements.
Compliance and Documentation
In projects involving regulated markets or customer audits, documentation availability can influence approval timelines. The datasheet references CB 62368-1 and CB 60950-1. TPS-Shop provides downloadable documents such as RoHS declaration, CE-related documentation, UL 62368 documentation, and mechanical drawings.
Open the TPS-Shop product page to download specs & compliance docs
External references (authoritative):
80 PLUS PSU certification program,
IEC 62368-1 standard overview.
Integration Notes for System Integrators and Panel Builders
Mechanical Fit, Airflow and 1U Thermal Behavior
1U power supplies operate in thermally dense environments with limited airflow paths. FSP400-50UCB’s compact dimensions (190 × 100 × 40.5 mm) can support space-constrained chassis, but system-level thermal performance depends on airflow planning.
- Keep intake/exhaust paths clear
- Avoid cable bundles blocking vents
- Validate temperatures under worst-case load in your enclosure
The specification indicates fan-based cooling, and TPS-Shop describes a built-in 40 mm fan solution. Treat the PSU as part of the enclosure airflow concept, not an isolated component.
Harness, Connectors, Labeling and Serviceability
TPS provides a mechanical/drawing package for the FSP400-50UCB (manufacturer code 9PA400MQ01) that maps connectors and wiring. For RFQs and build documentation, confirm:
- Harness lengths and connector types required by your chassis/backplane
- Whether the optional –5 V rail is required
- Labeling expectations for production and field maintenance
Practical tip: Include the drawing PDF in your manufacturing package so cable routing and strain relief are consistent across builds. If you need support with documentation handling and shipment in your name, see TPS Additional Services.
PS_ON#, +5VSB and Power-Good for Controlled Start-Up
The specification describes PS_ON# (active-low, TTL compatible) and clarifies that +5VSB remains enabled whenever AC is present. This can support managed start-up patterns commonly used in IPC and network-attached platforms.
If your system uses a supervisory controller, a common sequencing approach is:
- Use +5VSB for standby power
- Validate environmental or system conditions
- Assert PS_ON# to enable the main rails
This approach can also help reduce nuisance trips in installations with shared circuits.
EMI and Grounding Checklist for Low-Noise Deployments
Low ripple and low noise are achieved at system level when enclosure layout, grounding, and harness routing are implemented consistently. Use this checklist in your design review:
- Star-ground sensitive analog sections; avoid ground loops through chassis mounting points
- Keep high di/dt loops short (CPU VRM, GPU/accelerators, drive power harness)
- Use cable ferrites when needed and document the rationale
- Validate emissions in your enclosure configuration, not only the PSU standalone (especially with long harnesses)
RFQ Checklist (What Procurement Should Confirm Before Ordering)
To reduce ambiguity and speed up quoting, include:
- Quantity and ramp plan (prototype, pilot, serial production)
- Region (US/EU) and customer-specific compliance requirements (if any)
- Harness/connector requirements (match to drawing package; confirm optional –5 V requirement)
- Load profile: peak +12 V current, +5 V/+3.3 V combined power, standby requirement (+5VSB)
- Environmental: ambient temperature, altitude, dust/airflow constraints
- Documentation: the exact PDFs required for your customer audit package
To keep internal references consistent, start from the product page so your team uses the same identifiers:
FSP400-50UCB (AX1035 / 9PA400MQ01) on TPS Shop.
Typical Application Scenarios
This 1U industrial power supply can be relevant when you need compact rack height, wide input, and stable multi-rail outputs. Typical deployments include:
IPC controller power supply for automation and edge compute
IPC controllers often combine a motherboard, fieldbus/network interfaces, and I/O cards—loads that can be sensitive to ripple and transient response. With clearly specified rails, FSP400-50UCB is positioned for IPC controller applications, particularly where documentation is required as part of the delivery.
Workstation and storage system power supply in 1U/short-depth builds
Storage appliances and compact workstations typically require reliable +12 V power for drives and CPU power stages, plus standby behavior for remote management. If your platform uses a controlled power-up sequence, the PS_ON# and +5VSB behavior described in the specification can be useful for stable start-up under variable mains conditions.
Communication and automation equipment with regulated requirements
For communication or automation products sold into regulated markets, documentation can be part of the deliverable. TPS-Shop provides downloadable technical documents and compliance declarations that can support audit-ready project files.
Alternative TPS Power Solutions
Depending on enclosure, efficiency targets, and load profile, other options may be more suitable. Common selection paths include:
- Need higher power for accelerators or dense storage?
Consider FSP700-80PSA-SK (700 W industrial IPC PSU). - Need a lower-power ATX industrial supply?
Compare FSP300-70PFL-SK (300 W)
or FSP350-50SAC (350 W). - Need 500 W options depending on enclosure and efficiency target?
See FSP500-50AAC
or FSP500-50FDB (80 PLUS Gold, 1U server). - Building a DIN-rail cabinet instead of a 1U rack?
Start with TPS010 GP Series (10–100 W),
TPS030 PRO Series (24 V, 30–130 W),
or TPS100 Peak DR-Plus (170% boost). - Need Flex ATX for ultra-compact systems?
Consider FSP220-50FGBBI (220 W Flex ATX).
If the 400 W 1U option is your preferred baseline, use the product page for ordering and documentation:
Buy / RFQ FSP400-50UCB on TPS Shop.
How to Buy from TPS (Sourcing and Documentation)
TPS Elektronik provides a structured sourcing path with consistent identifiers (AX1035 / 9PA400MQ01), live availability, and downloadable technical/compliance documents. This can simplify alignment between engineering, procurement, and QA.
- Ordering: use TPS-Shop for procurement and internal traceability
- Documentation pack: download specs, drawings, and compliance PDFs for your project file
- Support: if you need logistics or documentation handling beyond ordering, see TPS Additional Services
Open product page (live stock, documents, ordering)
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Send RFQ: include your harness + load profile
FAQ
- Is FSP400-50UCB suitable as an IPC controller power supply?
- FSP400-50UCB is positioned for IPC controllers, workstations, communication, and automation applications, with wide input range and multi-rail outputs. For integration, confirm your cross-load (+3.3 V/+5 V combined) and thermal conditions in your chassis.
- What does “80 PLUS Bronze” mean in practice?
- 80 PLUS is a PSU efficiency certification program with defined test points and efficiency levels. Bronze indicates one certified efficiency tier within this program.
- Does this 400 W 1U switching power supply support remote on/off?
- The specification describes PS_ON# behavior (active-low TTL control) and notes that +5VSB remains available whenever AC is present. This can support managed start-up and standby features.
- Do I get compliance documents for customer audits?
- TPS-Shop provides downloadable technical datasheets, drawings, and compliance declarations (e.g., RoHS/CE/UL-related documents) from the product page.
- How do I ensure low ripple and noise at the system level?
- Use good grounding practice, keep high-current loops short, avoid obstructing airflow, and validate emissions/ripple in your final enclosure with your actual harness lengths and loads.
