Motorola SPN4139A AC Adapter 12VDC 300mA Power Supply

Motorola SPN4139A AC Adapter 12VDC 300mA Power Supply

The Motorola SPN4139A is a regulated AC adapter that converts standard wall power to 12 volts DC at 300 milliamps (3.6 watts output). This compact power supply is designed for Motorola two-way radios, portable transceivers, battery chargers, and other communications equipment that requires a stable 12V DC source. The adapter features a desktop form factor with a detachable power cord, making it suitable for stationary charging and operation stations.

Specifications & What's Included

• Model: SPN4139A
• Manufacturer: Motorola
• Output Voltage: 12 volts DC
• Output Current: 300 milliamps (mA)
• Power Output: 3.6 watts
• Input: Standard AC wall outlet (100–240V)
• Form Factor: Desktop AC adapter with detachable power cord
• Application: Motorola portable radios, scanners, and communications devices

Applications

The SPN4139A is a standard accessory for Motorola two-way radio systems and communications equipment from the mid-to-late 1980s and 1990s era. These adapters are used in base stations, repeater control systems, charger stations, and mobile/portable radio operation where a regulated 12V DC source is required. The 300mA output capacity is typical for powering Motorola handheld and mobile transceivers, battery charging systems, and associated control equipment. This adapter type remains in use today by radio enthusiasts, emergency responders, and organizations maintaining legacy Motorola communications systems.