VPX and CompactPCI Power Supplies: A Practical Selection Guide for Rugged Embedded Systems
Why this matters
If your project uses VPX (VITA 46) or CompactPCI (cPCI), power selection is not just "pick a wattage." It impacts thermal headroom, availability, integration time, and long-term support.
- VPX is defined by VITA as the VITA 46.0 VPX Baseline Standard, aimed at harsh-environment applications.
- CompactPCI (PICMG) is a modular approach suitable across industrial, aerospace, military, instrumentation, data acquisition, communications, and machine control.
VectorPower's OEM portfolio includes DC-DC converters, CPCI/VPX/VNX power supplies, and system-level custom AC-DC/DC-DC designs, intended for harsh industrial environments.
Where VPX and CompactPCI systems are typically found
CompactPCI is positioned by PICMG for industrial and commercial as well as aerospace, military, instrumentation, data acquisition, and telecom applications. VPX (VITA 46) is positioned as a harsh-environment embedded standard.
Selection checklist: what to confirm before you pick a PSU
1. Platform requirement Confirm whether the system is VPX (VITA 46) or CompactPCI, and whether there are platform-level constraints on power modules.
2. Input source and input range What's feeding the power stage: AC input to a chassis supply, or a DC bus that needs DC-DC conversion? Verify from the system spec.
3. Total power and rail map List each rail (e.g., 12 V, 5 V, 3.3 V) and peak current per rail. Add margin for load transients and future expansion.
4. Thermal and environment Rugged embedded builds often run in constrained airflow and wider ambient ranges. Your selection must follow the vendor's derating curves.
5. Redundancy expectations If the application is critical, confirm whether the platform uses N+1 redundancy or similar concepts.
6. Compliance references Some VPX power modules reference additional standards such as ANSI/VITA 62. Confirm compliance requirements per module.
Common mistakes and how to avoid them
- Selecting by watts only and ignoring rails and peaks — leads to instability under dynamic loads.
- Ignoring heat — high-density power becomes a thermal design problem fast.
- Not planning availability — rugged programs may require long lifecycle sourcing.
RFQ tips: how to get a fast, accurate quote
To get a quote quickly, send:
- Platform: VPX or CompactPCI
- Input: AC or DC bus, input range
- Rails: voltages and peak currents
- Power budget and envelope constraints
- Target delivery date and quantities
If you share your rail map and constraints, VectorPower can propose an OEM power option — including VPX and cPCI families where applicable — and return a commercial offer with lead-time scenarios.