Powering Compact Innovation: The Ultimate Guide to MORNSUN's LD03-23BxxWR2 3W Miniature DC/DC Converter

In the relentless drive towards miniaturization and efficiency in modern electronics, every millimeter of PCB space is precious. Designers of industrial controls, IoT sensors, and communication modules face the constant challenge of integrating robust, reliable power conversion into increasingly compact footprints. This is where the MORNSUN LD03-23BxxWR2 series shines. As a 3W industrial-grade DC/DC converter in an ultra-miniature SIP (Single In-line Package), this series delivers isolated, stable power where space is at an absolute premium, without compromising on performance or reliability. This guide explores why this tiny powerhouse is a critical component for next-generation compact designs. Core Features: Maximum Performance in a Miniature Package The LD03-23BxxWR2 is engineered to solve the core power challenges in space-constrained applications through a combination of miniaturization and robust electrical design. Ultra-Compact Footprint: Housed in a miniature SIP package measuring just 19.50 x 10.00 x 6.50 mm, this converter is designed to save invaluable PCB real estate, enabling denser and more innovative product designs. Wide Voltage Input Range: It accepts a broad 9-36V DC input (18-75V DC for the 2:1 input version), offering exceptional flexibility for systems operating from 12V, 24V, or variable battery power sources. High Efficiency & Thermal Performance: With efficiency up to 86%, it minimizes power loss and heat generation. Its efficiency remains consistently high across a wide load range, supporting reliable operation in environments with limited airflow. Industrial-Grade Reliability: Featuring a high 3000VAC isolation voltage for one minute, it provides critical protection against high-voltage transients and breaks ground loops. It is designed for a wide operating temperature range of -40°C to +105°C, ensuring stability in harsh conditions. Comprehensive Safety Protections: The series includes built-in output short-circuit, over-current, and input under-voltage protection, safeguarding both the converter and the sensitive load it powers. Excellent EMC Performance: Its design references key international standards for electromagnetic compatibility, including IEC/EN 61000-4-2/4/5/6 for immunity and CISPR 32 for emissions, making it suitable for noise-sensitive applications. Complete Product Model Selection Guide The series offers a comprehensive selection of eight standard output voltages to match diverse low-power requirements, all within the same miniature SIP package.

Model Number	Input Voltage Range (VDC)	Output Voltage (V)	Output Current (mA)	Output Power (W)
LD03-23B03WR2	9-36	3.3	909	3
LD03-23B05WR2	9-36	5.0	600	3
LD03-23B09WR2	9-36	9.0	333	3
LD03-23B12WR2	9-36	12.0	250	3
LD03-23B15WR2	9-36	15.0	200	3
LD03-23B03WR2-H	18-75	3.3	909	3
LD03-23B05WR2-H	18-75	5.0	600	3
LD03-23B12WR2-H	18-75	12.0	250	3

Technical Specifications at a Glance Input Range: 9-36VDC (Standard), 18-75VDC (Wide 2:1 Input models with suffix "-H") Output Power: 3W continuous Isolation Voltage: 3000VAC for 1 minute Isolation Capacitance: Typically < 15pF Efficiency: Up to 86% Switching Frequency: 400KHz (typical) Operating Temperature: -40°C to +105°C Storage Temperature: -55°C to +125°C Safety Standards: Complies with UL/EN/IEC 62368-1 EMC Performance: Design references IEC/EN 61000-4-2/4/5/6, CISPR 32 Warranty: 3 years Ideal Target Applications Due to its tiny size, wide input range, and strong isolation, the LD03-23BxxWR2 is the perfect power solution for a vast array of compact and sensitive systems, including: Industrial Control & Automation: PLCs, sensor interfaces, isolators, and fieldbus modules. Internet of Things (IoT): Wireless sensor nodes, smart meters, and compact gateways. Telecommunications: Fiber optic networking equipment and communication interfaces. Instrumentation & Measurement: Data acquisition systems and test equipment. Medical Electronics: Patient monitoring and diagnostic equipment (where applicable per regulations). Conclusion The MORNSUN LD03-23BxxWR2 series proves that great power can come in the smallest packages. It masterfully balances the critical demands of miniaturization, electrical isolation, wide input range, and robust industrial protection. For engineers designing the next wave of compact industrial and IoT devices, this 3W DC/DC converter offers a reliable, efficient, and space-saving foundation for their power architecture. For specific application notes, detailed datasheets, or design support, please contact: Vic@feisman.cn