High-Reliability Brick DC-DC Converter for Railway Use

Features

Industrial Standard Quarter Brick Package
Ultra-wide Input Range 36-160VDC
Excellent Efficiency up to 91%
I/O Isolation 2000VAC with Reinforced Insulation
Operating Baseplate Temp. Range -40℃ to +105℃
Passed Temperature Cycle Test (TCT) more than 1000 Cycles
No Min. Load Requirement
Under-voltage, Overload/Voltage/Temp. and Short Circuit Protection
Remote On/Off Control, Output Voltage Trim, Output Sense
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

OVERVIEW

MRZI75 Series Brick DC-DC Converter for Railway Applications

The MINMAX MRZI75 series is a new generation of high-performance brick DC-DC converters, offering 75W output power in a compact quarter-brick package. Engineered specifically for railway applications, this series features an ultra-wide input voltage range of 36–160VDC, making it compatible with a variety of rolling stock power systems.

Available in regulated output voltage options of 5, 12, 15, 24, and 54VDC—including models suitable for PoE applications—the MRZI75 series ensures flexibility and efficiency across multiple subsystems. Thanks to advanced circuit design, it achieves efficiency levels up to 91%, supporting reliable performance even under high baseplate temperatures up to 105°C.

Built for demanding conditions, this brick DC-DC converter includes a reinforced 2000VAC input-output isolation barrier and has successfully passed Temperature Cycle Testing (TCT) with over 1000 cycles, guaranteeing durability over long-term operation. It also features comprehensive protections such as under-voltage lockout, overload, over-voltage, over-temperature, and short-circuit protection.

System designers benefit from enhanced functionality with remote ON/OFF control (positive and negative logic), output voltage trimming, and output sense functions, making integration into complex railway systems more precise and reliable.

Certified to critical railway standards—including EN 50155 for rolling stock electronics, EN 50121-3-2 for EMC compliance, and EN 45545-2 for fire protection—the MRZI75 series meets international safety and environmental expectations. Its rugged design makes it the perfect brick DC-DC converter for applications such as traction control, onboard lighting, communication systems, security equipment, and HVAC modules in railway environments.

Specifications

Output Voltage Accuracy		±1.0% max.
Line Regulation		±0.2% max.
Load Regulation		±0.3% max.
Ripple & Noise (20MHz)	5V, 12V, 15V	100mVp-p Max.
	24V	150mVp-p Max.
	54V	300mVp-p Max.
Efficiency		Up to 90%
I/O Isolation Voltage		2000VAC min. (Reinforced Insulation)
Baseplate Temperature Range		-40°C to +105°C (See Derating Curve)
I/O Isolation Capacitance		2200pF typ.
Short Circuit Protection		Continuous (Auto. Recovery)
Output Voltage Trim	Other Models	±10% max.
	54V Output	+5/-15% max.
Remote ON/OFF		Enable High
Case Material		Plastic resin (flammability to UL 94V-0 rated)
Railway & Safety Approval		UL/cUL/IEC/EN 62368-1, CB-Report, EN50155 (IEC60571) & CE Marking