1 Belfuse QM48T25050-NDB0G DC-DC converter with quarter-brick form factor

2 Wide input voltage range: 36-75V DC

3 Output: 5V DC, up to 25A rated load current

4 Through-hole (TH) mounting type, low profile (0.31 inches /7.9mm)

5 Lightweight: 1.1 oz (31.5g) typical

6 High efficiency design, no heat sink required

7 Industry-standard quarter-brick pinout for easy system integration

8 On-board input differential LC filter to reduce reflected ripple current

9 Supports start-up into pre-biased output and no minimum load requirement

10 RoHS-compliant (lead-free solder) and lead-solder-exempted options available

11 Fully protected: Overcurrent, short circuit, overvoltage, overtemperature (auto-restart after fault removal)

12 Remote output sense function to compensate for voltage drops at the load

13 Output voltage trim range: -20% to +10% of nominal value for design flexibility

14 High reliability: MTBF of 2.6 million hours (calculated per Telcordia TR-332 Method I Case1)

15 Optional positive/negative logic ON/OFF control

16 Safety certifications: UL/CSA 60950-1, EN62368-1, IEC60950-1, IEC62368-1 (basic insulation)

17 Meets FCC Class B and EN55022 Class B conducted emissions with external filter

18 All materials comply with UL94 V-0 flammability rating

1 Telecom base stations and equipment (supports 48V battery systems, prevents deep discharge)

2 Data center servers and networking gear (high current, efficient power conversion)

3 Industrial automation systems (wide input range, robust protection features)

4 Embedded systems and IoT devices (low profile, no heat sink needed for space-constrained designs)

5 Networking switches and routers (quarter-brick form factor is widely used)

6 Industrial control systems (reliable power with overcurrent/overvoltage protection)

7 Telecom battery backup systems (handles pre-biased output start-up)

1 External input fuse: A 7A fuse is recommended to comply with safety agency requirements

2 Remote sense usage: If not used, short SENSE(+) to Vout(+) and SENSE(-) to Vout(-); if used, connect sense pins to load points

3 Trim resistor guidelines: Follow provided equations for trim-up/trim-down; do not exceed ±20%/+10% range; leave trim pin open if unused

4 Thermal management: Adhere to thermal derating curves based on ambient temperature and airflow to avoid overheating

5 Overtemperature protection: Auto-restarts once cooled to safe operating temperatures

6 Input undervoltage lockout: Turns on at ≥35V, shuts off at ≤31V

7 Overcurrent/short circuit protection: Switches to constant current then shuts down; auto-restarts every ~100ms until fault is removed

8 Overvoltage protection: Triggers when output exceeds threshold; auto-restarts until fault cleared

9 EMC compliance: Use external filter to meet FCC Class B and EN55022 Class B conducted emissions

10 Safety warning: Not intended for life support, hazardous environments, or nuclear control systems

11 Spec changes: Product specifications may change without prior notice

QM48T25050-NDB0G-PDF数据手册-参考资料