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Lone Star Step Down 24V To 12V Converter

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Part# 11-03309
MFR Model# LS03-05001-B


Note: Connector kit not included. Must be purchased separately. See Accessories.

With this TSO-C71 DC to DC Converter you can operate 12 Volt Radios, GPS's, and Electronic Devices in a 24 Volt Aircraft.

Physical Features
Size: 6.0" W x 5.0" D x 1.75" H
Weight: 1.5 lbs.
Color: Gold Anodized
Material: Aluminum Extrusion


  • Input Voltage: 22-32 VDC
  • Output Voltage: 13.8 VDC
  • Efficiency: 89% (24 VDC @ Full Load)
  • Regulation: Line-Load = .03 VDC
  • Ripple: .005 Volts at 400hz
  • Altitude: 50,000 Ft.
  • Over Current : 110-140% > 5A Auto Recovery
  • Terminal Block: (5) Phillips Pan Head Screws
  • MTBF: 100,000 Hrs./According to Mil HBK 217F
  • Output Current: 10 A, 12 A Peak at 13.8 VDC
  • Temperature: -55C to (+) 70C
  • TSO Category: Category A
  • Accessories
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Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: What the Lone Star Step Down 24V to 12V Converter's current rating?

Per the manufacturer, Input: 27.5 Volts, Input: 5.6 Amps, Output: 14.06 Volts, Output 10 Amps.

Q: Is the output adjustable? If so, what range?

No, the voltage is set at 12V and is not adjustable.

Q: Is the Lone Star Step Down 24v to 12v TSOed?

Yes, it is.

Q: Does this converter have back voltage protection?

Yes. The LS03-05001-A dc converter has over voltage protection.

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