MKZI40 Series
40W DC-DC Converters
  • Industrial Standard 2"×1" Package
  • Ultra-wide Input Range 36-160VDC
  • I/O Isolation 3000VAC with Reinforced Insulation
  • Excellent Efficiency up to 90%
  • Operating Ambient Temp. Range -40℃ to +77.5℃
  • No Min. Load Requirement
  • Under-voltage, Overload/Voltage/Temp. and Short Circuit Protection
  • Remote On/Off Control, Output Voltage Trim
  • Vibration and Shock/Bump Test EN 61373 Approved
  • Cooling, Dry & Damp Heat Test IEC/EN 60068-2-1, 2, 30 Approved
  • Railway EMC Standard EN 50121-3-2 Approved
  • Railway Certified EN 50155 (IEC60571) Approved
  • Fire Protection Test EN 45545-2 Approved
  • UL/cUL/IEC/EN 62368-1 Safety Approval & CE Marking

The MKZI40 series from MINMAX is a next-generation 40W railway-certified isolated DC-DC power converter. It features an ultra-wide input voltage range of 36-160VDC, making it suitable for railway DC systems. The series offers seven models providing precise output voltages of 5/12/15/24/54/±12/±15VDC. With a compact 2"x1" size and full encapsulation packaging, the MKZI40 series is designed to resist external environmental interference, specifically designed for battery-powered railway systems and harsh environmental applications.

Key features of the MKZI40 series include a high I/O isolation withstand voltage of 3000VAC, reinforced insulation system, up to 90% overall efficiency, operating temperature range of -40℃ to +77.5℃, no minimum load requirement, extremely low no-load power consumption, remote on/off control, output voltage trim, and various protection mechanisms (including under-voltage, output over-current, output over-voltage, over-temperature, and output short-circuit protection).

The outstanding circuit topology design allows the MKZI40 series to maintain high stability in overall conversion efficiency, power loss, and heat dissipation even under drastic variations in input voltage, output current, and environmental temperature. Its excellent load driving capability enables it to meet 100% power requirements of the system at startup. Additionally, the MKZI40 series exhibits high ruggedness, durability, and reliability, supporting stable long-term operation at altitudes of up to 4000 meters without any geographical restrictions.

The MKZI40 series complies with railway certification standards, including EN 50155 (IEC 60571), vibration and shock/bump test (EN 61373), cooling/dry/damp heat test (IEC/EN 60068-2-1, 2, 30), railway EMC standard (EN 50121-3-2), fire protection test (EN 45545-2), and safety certifications such as UL/cUL/IEC/EN 62368-1. The series also holds CB and CE certifications. Moreover, the MKZI40 series successfully passes temperature cycle tests from -40℃ to +125℃ for over 500 cycles and long-term reliability tests to meet the stringent requirements of railway system equipment. The MKZI40 series is an ideal choice for applications emphasizing space constraints, stringent electromagnetic compatibility, and physical environmental stress, and it finds extensive use in railway equipment such as pantographs, high-voltage detection systems, communication systems, collision warning systems, drowsiness detection systems, and autonomous driving systems.

Output Voltage Accuracy ±1.0% max.
Line Regulation ±0.2% max.
Load Regulation Single ±0.5% max.
Dual ±1.0% max.
Ripple & Noise (20MHz) 5V  75mVp-p typ.
24V  150mVp-p typ.
54V  250mVp-p typ.
others  125mVp-p typ.
Efficiency Up to 90%
I/O Isolation Voltage 3000VAC min. (Reinforced Insulation)
Operating Ambient Temp. Range -40°C to +77.5°C (See Derating Curve)
I/O Isolation Capacitance 1500pF typ.
Short Circuit Protection Continuous (Auto. Recovery)
Output Voltage Trim ±10% max.
Remote ON/OFF Enable High
Case Material Metal (6 side shielded with insulated baseplate)
Railway & Safety Approval UL/cUL/IEC/EN 62368-1(60950-1), CB-Report, EN50155 (IEC60571) & CE Marking
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Comparison ECAD Model Number Output Power Input Voltage (VDC) Output Voltage (VDC) Output Current (mA) Efficiency Output Regulation I/O Isolation Package Type