Emerson / Artesyn / Astec LPT42 Power Supply

The Emerson/Artesyn/Astec LPT42 is a 40W open-frame AC-DC power supply engineered for ITE and medical applications requiring compact, reliable multi-output regulation. Operating from universal input (85–264 VAC or 120–300 VDC, 47–440 Hz), it delivers triple outputs: +5V @ 4A, +12V @ 2A, and –12V @ 0.5A under convection cooling; output capacity increases to 55W with 30 CFM forced air cooling. The unit occupies just 5.00" × 3.00" × 1.14" (less than 1U height) and weighs approximately 8 oz, fitting space-constrained chassis designs.

Technical Specifications

Input Specification: 85–264 VAC or 120–300 VDC, 47–440 Hz

Output Voltages: +5V, +12V, –12V (triple output configuration)

Output Current (Convection): +5V @ 4A, +12V @ 2A, –12V @ 0.5A

Output Current (30 CFM Forced Air): +5V @ 5A, +12V @ 2.5A, –12V @ 0.7A

Total Power Rating: 40W (convection), 55W (forced air)

Efficiency: 70%

Cross Regulation: ±2% on +5V output; ±5% on +12V and –12V outputs

Main Output Adjustment Range: –5% to +10%

Hold-up Time: 20 ms @ 40W load, 115 VAC nominal

Overvoltage Protection: 5.7–6.7 VDC on main output

Overload Protection: Short-circuit protection on all outputs; case overload protection 110–145% above peak rating

Remote Sense: Compensates for 0.5V lead drop minimum; operates without remote sense connected

Reverse Connection Protection: Yes

Operating Temperature: 0–50°C ambient (2.5% derating per °C from 50–70°C)

Start-up Temperature: –20°C

Storage Temperature: –40–85°C

Humidity: 5–95% non-condensing

Vibration: 0.75G peak, 5 Hz–500 Hz operational (three orthogonal axes, 1 oct/min sweep, 5 min dwell at resonances)

EMI Susceptibility: IEC 801 Levels 2, 3, 4, 5, 6 compliant (Level 3)

Key Features

Compact 3" × 5" footprint, sub-1U height

Universal AC or DC input acceptance

Adjustable main output with remote sense capability

Short-circuit and overload protection across all rails

Reverse polarity protection

Typical Applications

Commercial information technology equipment (ITE)

Medical device power

Space-limited embedded systems

Compatibility & Integration

Connectors: Molex 09-50-8031 (USA) or 09-91-0300 (UK) AC input; Molex 09-50-806 DC output

Certifications: CB, CE, UL2601, CSA 22.2 No. 601.1

Mounting: Chassis mount