MEAN WELL SD-25B-12 DC-DC Converter 12V 2.1A 25.2W Industrial Power Module

Industrial automation engineers often need a reliable DC-DC converter to step down a 12V battery or bus voltage to a stable 12V rail for sensors, controllers, and actuators. The MEAN WELL SD-25B-12 delivers exactly that: a robust 25.2W power module with a wide 9.2–18V DC input range and a regulated 12V DC output at up to 2.1A. Its chassis-mount design with screw terminals makes it easy to integrate into control cabinets, machinery, or vehicle systems.

Key specifications

• Input voltage: 9.2–18V DC (nominal 12V DC)
• Output voltage: 12V DC
• Output current: 2.1A
• Rated power: 25.2W
• Efficiency: 80%
• Isolation: 1500V DC input-output
• Protections: short circuit, overload, over voltage
• Operating temperature: -20°C to +60°C
• Cooling: free air convection
• Ripple & noise: 120mVp-p
• Line regulation: ±0.5%
• Load regulation: ±1.0%
• MTBF: >200,000 hours
• Safety standards: UL60950-1, TUV EN60950-1, CE
• Mounting: chassis mount
• Connections: screw terminals

Why choose it

This converter is built for harsh industrial environments. Its wide input range tolerates voltage fluctuations from batteries or unregulated supplies, while the isolated output protects sensitive loads. The high MTBF and compliance with international safety standards mean you can deploy it with confidence in long-term installations.

Ideal use cases

• Powering 12V sensors and controllers in factory automation
• Voltage stabilization for vehicle or marine electronics
• Isolated power for PLCs and data acquisition systems
• Battery-powered equipment requiring a regulated 12V rail

Good to know

The SD-25B-12 operates with free air convection, so no fan is needed—reducing noise and maintenance. Its compact chassis-mount form factor saves space in crowded enclosures. Screw terminals allow quick, secure wiring without special tools.