RS31337 - 2.97V to 16V, 5.5A True Reverse Current Blocking eFuse with Circuit Breaker Protection and PG

RS31337 2.97V to 16V, 5.5A True Reverse Current Blocking eFuse for 12V Power Rail Protection

Modern servers, industrial automation systems, networking equipment, and communications platforms rely on distributed 12V power rails to power storage devices, PCIe cards, optical modules, embedded controllers, and other critical subsystems. Protecting these rails requires more than conventional overcurrent protection—it demands intelligent fault management, reverse current blocking, reverse polarity protection, and robust overvoltage protection to ensure reliable system operation.

The RS31337 is a highly integrated 5.5A eFuse optimized for 12V power rail protection. Operating from 2.97V to 16V, it combines true reverse current blocking, input reverse polarity protection, adjustable current limiting, programmable transient overcurrent blanking, and a 13.88V output overvoltage clamp into a compact 2 × 2 mm QFN-10 package.

With integrated 23mΩ back-to-back MOSFETs, the RS31337 protects both the power source and the load from abnormal operating conditions while simplifying system design and reducing PCB area.

---

Optimized for 12V Distributed Power Systems

The RS31337 is specifically designed to protect medium-current 12V power rails found throughout today’s electronic systems.

Typical applications include:

• Server motherboards
• PCIe expansion cards
• HDD and SSD power rails
• Networking switches and routers
• Optical modules
• Industrial automation systems
• Communications infrastructure
• Embedded computing platforms
• Security and surveillance equipment

Its integrated 13.88V output overvoltage clamp helps protect downstream electronics from damaging voltage transients while maintaining normal operation during standard supply variations.

---

True Reverse Current Blocking

Unlike conventional eFuses, the RS31337 integrates back-to-back MOSFETs that completely block current flow in either direction whenever the device is disabled or a fault occurs.

This architecture provides:

• Reverse current protection
• Input reverse polarity protection
• Backfeed prevention
• Isolation between power domains
• Protection for redundant power supplies
• Safe hot-plug operation

These capabilities make the RS31337 particularly well suited for systems that incorporate redundant supplies, battery backup, or removable modules.

---

Intelligent Fault Protection

The RS31337 integrates multiple programmable protection features into a single compact device, including:

• Adjustable current limit from 0.5A to 6A
• Active current limiting or circuit-breaker operation
• Programmable transient overcurrent blanking timer
• Fast short-circuit protection
• Adjustable output slew rate
• Adjustable input UVLO
• Adjustable input overvoltage lockout (OVLO)
• Thermal shutdown
• Fault (FLT) and Power Good (PG) outputs

These configurable protection features allow designers to optimize startup performance while minimizing nuisance shutdowns caused by temporary overloads or capacitive inrush currents.

---

Handles Capacitive Loads with Ease

Large bulk capacitors on 12V rails often generate substantial startup current.

The RS31337 addresses this challenge through:

• Adjustable transient blanking timer
• Programmable output slew rate
• Adjustable current limiting

This combination allows large capacitive loads to charge normally while still providing rapid protection against sustained overloads and short circuits.

---

Efficient Reverse Polarity Protection

The integrated 23mΩ back-to-back MOSFETs eliminate the need for external reverse polarity protection circuitry, providing:

• Lower voltage drop
• Higher efficiency
• Reduced heat generation
• Lower BOM cost
• Smaller PCB footprint
• Simplified layout

This highly integrated architecture makes the RS31337 ideal for compact, high-reliability power designs.

---

Part of Reed Semiconductor’s Reverse Current Blocking eFuse Family

The RS31337 is part of Reed Semiconductor’s family of reverse current blocking eFuses, allowing designers to select the output overvoltage clamp optimized for their system voltage while maintaining a common feature set.

Every member of the family includes:

• True reverse current blocking
• Input reverse polarity protection
• 2.97V to 16V operating range
• Adjustable current limiting
• Programmable transient overcurrent blanking
• Adjustable UVLO and OVLO
• Fast short-circuit protection
• Thermal shutdown
• Fault and Power Good outputs

This common architecture enables designers to reuse PCB layouts while selecting the output overvoltage clamp that best matches the protected rail.

---

Why Choose the RS31337?

The RS31337 combines 5.5A current capability, true reverse current blocking, input reverse polarity protection, and programmable fault management into a compact, highly integrated eFuse optimized for 12V power rails. Its 13.88V output overvoltage clamp, integrated back-to-back MOSFETs, and configurable protection features make it an ideal solution for protecting storage devices, networking equipment, industrial controllers, communications infrastructure, and other systems where reliable 12V power-path protection is essential.