Alcatel-Lucent 270-0038-010 10.5 VDC Power Supply – Complete Specification and Application Guide

The Alcatel-Lucent 270-0038-010 is a dedicated DC power supply module that provides a stabilized 10.5 VDC output, primarily utilized in telecom central offices, enterprise equipment racks, and outdoor cabinet installations. This power unit is engineered to meet the stringent requirements of communication systems, offering high efficiency, excellent regulation, and robust protection features in a compact mechanical footprint.

Input voltage acceptance ranges from 36 VDC to 75 VDC, covering the typical -48 VDC nominal supply found in telco environments. The module incorporates a synchronous buck converter topology, achieving up to 92% efficiency at full load, which minimizes heat dissipation and reduces cooling demands. The output voltage is factory‑trimmed to 10.5 V ±1% under all load conditions, with a maximum output current of 15 A, delivering a total power of 157.5 W.

Protection mechanisms are comprehensive. The 270-0038-010 includes input under‑voltage lockout (UVLO), output over‑voltage protection (OVP) clamping at 11.2 V, over‑current protection (OCP) with auto‑recovery hiccup mode, and short‑circuit protection. Thermal shutdown is activated when the baseplate temperature exceeds 100°C, preventing catastrophic failure. All protections are latched or auto‑recoverable, selectable via an external control pin.

The module is designed for conduction cooling through a chassis or heat spreader. Its aluminum baseplate provides a low thermal resistance path, and the unit can operate at full rated power in ambient temperatures from -40°C to +85°C when properly heat‑sunk. For forced‑air cooling scenarios, derating curves are provided in the datasheet, ensuring reliable operation across varying airflow conditions.

Electrical isolation between input and output is 1500 VDC, meeting the basic insulation requirements for telecommunications equipment. The output is floating, allowing the user to configure it as positive or negative ground according to system needs. An output voltage sense line (remote sense) compensates for voltage drops across the cable, maintaining regulation at the load point up to a 0.5 V drop.

The 270-0038-010 features a standard 2x4 pin connector (Molex or equivalent) for input, output, and auxiliary signals. Pin assignments include +Vin, -Vin, +Vout, -Vout, sense lines, and an enable pin. The enable pin can be driven by a TTL signal for remote on/off control, allowing coordinated power sequencing in multi‑rail systems. An LED indicator on the module shows power‑good status, and an open‑collector power‑fail alarm output provides early warning of impending shutdown.

From a reliability perspective, the module is rated for MTBF > 1 million hours at 25°C, calculated per Telcordia SR-332. The design uses high‑quality electrolytic capacitors with low ESR, and ceramic capacitors for high‑frequency decoupling. The PCB is coated with a conformal protective layer to resist humidity and dust ingress. Vibration and shock tests comply with GR-63-CORE, making the unit suitable for seismic zones and transportation vibration.

Installation is straightforward – the module slides into a dedicated shelf or clips onto a DIN rail (with optional adapter). The baseplate requires thermal interface material (e.g., phase‑change pad) for optimal heat transfer. Four mounting holes accommodate M3 screws. The module dimensions are 116 mm x 61 mm x 25 mm (L x W x H), with a weight of approximately 180 grams.

In terms of electromagnetic compatibility, the 270-0038-010 meets EN 55022 Class B conducted and radiated emissions, with immunity to electrostatic discharge (ESD) up to 8 kV contact, and fast transient/burst immunity per IEC 61000-4-4. It also passes surge tests per IEC 61000-4-5, ensuring robust performance in industrial power environments.

Typical applications include powering compact Ethernet switches, optical network units (ONUs), microwave indoor units, small routers, and sensor hubs. Its stable 10.5 V output is also compatible with many legacy analog circuits requiring a precise low‑voltage rail. The module’s efficiency and compact size make it an excellent choice for space‑constrained, high‑density chassis systems.

Maintenance is simplified by the hot‑swap capability – the module can be inserted or removed from a live backplane without system downtime, provided the backplane supports controlled hot‑swap. This feature is critical for high‑availability networks where power redundancy is mandatory. The module also offers a current‑share pin for parallel operation, enabling N+1 redundancy with external ORing controllers.

In conclusion, the Alcatel-Lucent 270-0038-010 10.5 VDC Power Supply is a reliable, efficient, and feature‑rich power conversion solution that aligns with the demanding standards of telecom infrastructure. Its robust protection, wide temperature range, and flexible control interfaces ensure it remains a dependable choice for system integrators and network engineers seeking a compact power source.