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November 20, 2025Introducing RS31390: 60A Stackable eFuse with PMBus
RS31390 2.07V to 16V, 60A eFuse with PMBus
As AI servers, cloud infrastructure, networking equipment, and telecommunications systems continue to demand more power, designers require protection devices that deliver higher current, intelligent monitoring, and scalability without increasing board space. The RS31390 60A Stackable eFuse addresses these challenges by combining a high-performance integrated MOSFET with PMBus® digital telemetry, programmable protection, and support for parallel operation.
Designed for modern 12V and 48V power distribution architectures, the RS31390 simplifies power protection while providing the monitoring and control capabilities needed for today’s intelligent power systems.
Why Choose the RS31390 60A Stackable eFuse?
The RS31390 integrates advanced circuit protection and digital telemetry into a compact 4.5mm × 5mm QFN package. Unlike traditional fuse solutions that require replacement after a fault, the RS31390 actively monitors system conditions and protects downstream circuitry by limiting current, controlling inrush current, and disconnecting the load during abnormal operating conditions.
Its integrated PMBus interface enables designers to configure operating parameters, monitor system health, and retrieve fault information without adding external monitoring circuitry.
The result is a highly integrated protection solution that improves system reliability while reducing component count and PCB area.
Intelligent Protection for High-Power Systems
Programmable Current Protection
The RS31390 60A stackable eFuse allows independent configuration of startup current limit and steady-state current limit, giving designers greater flexibility to optimize system startup while protecting sensitive loads during normal operation.
An adjustable soft-start function limits inrush current by controlling the output voltage ramp through an external capacitor connected to the DVDT pin. This reduces stress on connectors, capacitors, and downstream converters while improving overall system reliability.
Integrated Fault Protection
The RS31390 continuously monitors operating conditions and provides comprehensive protection against fault events, including:
- Overcurrent protection
- Short-circuit protection
- Overvoltage protection
- Undervoltage protection
- Overtemperature protection
- Fault reporting through PMBus telemetry
These protection mechanisms help prevent damage to expensive system components while minimizing downtime.
PMBus Digital Telemetry Simplifies System Monitoring
Real-Time Power Monitoring
One of the key advantages of the 60A Stackable eFuse is its integrated PMBus interface.
System designers can monitor critical operating parameters in real time, including:
- Input voltage
- Output voltage
- Load current
- Device temperature
- Fault status
- Device configuration
This digital telemetry reduces the need for external monitoring ICs while providing valuable diagnostic information for system management.
Simplified Configuration
Using PMBus commands, designers can configure protection thresholds, operating modes, and monitoring functions without hardware modifications. This flexibility simplifies product development and allows firmware updates to optimize system performance throughout the product lifecycle.
Scalable Current with Parallel Operation
Modern AI accelerators and server platforms often require current levels beyond the capability of a single protection device.
The RS31390 addresses this requirement through stackable parallel operation with the companion RS31389 follower device. By operating multiple devices together, designers can increase available load current while maintaining balanced current sharing and consistent protection performance.
This scalable architecture enables a common PCB design to support multiple current ratings with minimal redesign, reducing development time and simplifying inventory management.
Applications for the RS31390
The RS31390 is well suited for a wide variety of high-current applications, including:
- AI servers and GPU accelerator platforms
- Enterprise and cloud servers
- Telecommunications equipment
- Network switches and routers
- Storage systems
- Industrial computing
- High-performance embedded systems
- Distributed power architectures
Its combination of intelligent protection, digital telemetry, and scalable current capability makes it an ideal solution wherever reliable power distribution is required.
Compact Package for High Power Density
Despite delivering up to 60A, the RS31390 is housed in a compact 4.5mm × 5mm QFN-26 package, helping designers maximize power density without sacrificing thermal performance.
The integrated MOSFET architecture also reduces external component count, simplifies PCB layout, and minimizes parasitic resistance compared to discrete protection implementations.
The Advantages of the RS31390 60A Stackable eFuse
The RS31390 60A Stackable eFuse combines intelligent protection, digital telemetry, and scalable current capability into a compact, highly integrated solution for modern power systems. With programmable current limiting, adjustable soft-start, integrated current monitoring, comprehensive fault protection, and PMBus communication, it enables designers to build more reliable and easier-to-manage power distribution architectures.
Whether protecting AI accelerator cards, cloud servers, telecommunications equipment, or industrial power systems, the RS31390 delivers the performance, flexibility, and monitoring capabilities needed for next-generation electronic designs.
Explore More Stackable eFuse Solutions
The RS31390 60A Stackable eFuse is part of Reed Semiconductor’s growing family of intelligent circuit protection devices. Explore additional PMBus-enabled, stackable, and standalone eFuse solutions designed for AI servers, cloud computing, networking, telecommunications, and industrial power systems.
→ Browse Reed eFuse Products
Learn more about how our products can elevate your applications by contact our sales team.
Thank you for choosing Reed Semiconductor for innovative power management solutions!
