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Hot Swap

The ability to hot swap memory, drives, or other peripherals is a key functionality of server, computing, and telecom hardware. ON Semiconductor’s load switch and eFuse portfolios provide an easy, compact, and efficient solution with the hot swap controller and MOSFET integrated into one device. ON Semiconductor carries eFuses for 12 V, 5 V, and 3.3 V power domains, with 48 V compatible devices in development. We use the latest MOSFET technology to provide efficient, reliable, and compact hot swap capability with a variety of protection features.
Technical Documents
NIS5431 and NIS5452 Performance and Functionality
For many years ON Semiconductor eFuses have been used in a variety of applications such as hard drives, servers, and motherboards. They provide several protection features, they are reliable, and they are continually being improved upon. The NIS5135, NIS5132, and NIS5232 eFuses are some of the time-tested devices that have paved the way for ON Semiconductor’s newest eFuse products.
NIS5431 and NIS5452 Performance and Functionality
NIS5132/5 Demo Board
The NIS5132 and NIS5135 electronic fuses are monolithic, integrated circuits that offer superior protection for overcurrent, overvoltage The NIS5132 is designed for 12 volt systems while the NIS5135 is designed for 5 volt systems. These two chips can be easily interfaced for systems that include both a 5 and a 12 volt bus. By tying the enable pins together both units will shutdown if either unit encounters a fault condition.
NIS5132/5 Demo Board
NIS5112 Hot Plug Evaluation Board Manual
The NIS5112 Demo board is a simple circuit which biases the NIS5112 device so that its functionality can easily be observed. It contains an input capacitor of 1 F and output capacitor of 100 F, as well as a bleeding load resistor of 2 k.
NIS5112 Hot Plug Evaluation Board Manual
NIS5112 Transient Performance
The NIS5112 is an electronic fuse that incorporates a number of protection features. These include current limiting, thermal protection, and overvoltage protection. This device can replace a fuse/zener combination to add increased reliability and functionality along with the ability to reset automatically.
NIS5112 Transient Performance
eFuse Load Current Measurement
The On Semiconductor eFuse protection devices are primarily used for limiting the system load current in the event of overload or short circuit conditions. Almost all of those eFuse protection devices provide additional features such as soft start, output voltage clamp, reverse current protection, adjustable load current limit with external resistor and so on.
eFuse Load Current Measurement
eFuse Reverse Voltage Protection
ON Semiconductor’s eFuses offer low cost, low impedance solutions for bus protection and offer much faster protection than many fuse solutions. They are an effective replacement for a polyfuse and TVS clamping diode.
eFuse Reverse Voltage Protection
The Importance of Compensation Capacitors on the eFuse Power Line
ON Semiconductor produces a wide variety of silicon based protection products including current limiting devices such as Electronic Fuses (eFuses). During an over−current stress, eFuses can limit the current applied to a load as well as remove power from the load entirely
The Importance of Compensation Capacitors on the eFuse Power Line
Hot‐Plug Insertion Startup Time Delay for eFuse
The eFuse protection devices are used for limiting the system load current in the event of an overload or a short circuit. Many applications employ ON Semiconductor eFuses at the power input stage of the system between the main power input connector and DC−DC converters or power regulators.
Hot‐Plug Insertion Startup Time Delay for eFuse
Paralleling eFuses
The standard 12 V, 5 V and 3.3 V electronic fuses from ON Semiconductor provide overcurrent and overvoltage protection and come in different current limit configurations.
Paralleling eFuses
Enable Pin Operation and Functions of eFuses
ON Semiconductor electronic fuses (eFuses) are analog integrated circuits that are used to protect circuits operating from 3.3, 5, or 12 V DC supplies. They have numerous protection functionalities such as overvoltage clamping, current limiting, thermal shutdown, and a controlled output voltage slew rate. They are available in thermal latching or thermal auto-retry configurations.
Enable Pin Operation and Functions of eFuses
Advantages of eFuses Versus PTC Resettable Fuses
Overcurrent protection is a basic necessity for electrical devices. While many people are familiar with fuses and household circuit breakers, few are intimately familiar with the kinds of overcurrent protection devices that are found in electronics.
Advantages of eFuses Versus PTC Resettable Fuses
Evaluation Boards
NCP459FCT2GEVB: Load Switch, 4 A Evaluation Board
NCP459FCT2GEVB evaluation board is designed to quickly test the NCP458, which a is power load switch with very low Ron NMOSFET controlled by external logic pin, allowing optimization of battery life, and portable device autonomy.
NCP459FCT2GEVB: Load Switch, 4 A Evaluation Board
NCP451FCT2GEVB: 3.0 A Controlled Load Switch with Auto-Discharge Path Evaluation Board
The NCP451FCT2GEVB evaluation board is designed to quickly test the NCP451, a very low Ron MOSFET controlled by external logic pin, allowing optimization of battery life, and portable device autonomy.
NCP451FCT2GEVB: 3.0 A Controlled Load Switch with Auto-Discharge Path Evaluation Board
NCP457FCT2GEVB: 2 A Single Load Switch For Low Voltage Rail Evaluation Board
The NCP457FCT2GEVB evaluation board is designed to quickly test the NCP457, a power load switch with very low Ron NMOSFET controlled by external logic pin, allowing optimization of battery life, and portable device autonomy.
NCP457FCT2GEVB: 2 A Single Load Switch For Low Voltage Rail Evaluation Board
NCP458RFCT2GEVB: Load Switch, 4 A Evaluation Board
The NCP458RFCT2GEVB evaluation board is designed to quickly test the NCP458, which is a power load switch with very low Ron NMOSFET controlled by external logic pin, allowing optimization of battery life, and portable device autonomy.
NCP458RFCT2GEVB: Load Switch, 4 A Evaluation Board
NCP45521IMNGEVB: Integrated Load Switch with Ultra-Low Ron, 11.5A, Evaluation Board
The NCP45521IMNGEVB evaluation board is designed to quickly assess the NCP45521, an integrated load switch. The ecoSWITCH™ NCP45520, NCP45521 series of load management devices provide a component and area-reducing solution for efficient power domain switching with inrush current limit via soft start. 
NCP45521IMNGEVB: Integrated Load Switch with Ultra-Low Ron, 11.5A, Evaluation Board
NCP45520IMNGEVB: Controlled Load Switch with Ultra-Low Ron Evaluation board
The NCP45520 load switch provides a component and area-reducing solution for efficient power domain switching with inrush current limit via soft-start. In addition to integrated control functionality with ultra low on-resistance, this device offers system safeguards and monitoring via fault protection and power good signaling.
NCP45520IMNGEVB: Controlled Load Switch with Ultra-Low Ron Evaluation board
NCP45560IMNGEVB: Integrated Load Switch with Ultra-Low Ron, 23A, Evaluation Board
The NCP45560 load switch provides a component and area-reducing solution for efficient power domain switching with inrush current limit via soft-start. In addition to integrated control functionality with ultra low on-resistance, this device offers system safeguards and monitoring via fault protection and power good signaling.
NCP45560IMNGEVB: Integrated Load Switch with Ultra-Low Ron, 23A, Evaluation Board
NIS5232-35GEVB:  NIS5232-35 Electronic Fuse Evaluation Board
The NIS5232 and NIS5235 electronic fuses are monolithic, integrated circuits that offer superior protection for overcurrent and overvoltage. The NIS5232 is designed for 12 volt systems while the NIS5235 is designed for 5 volt systems.
NIS5232-35GEVB:  NIS5232-35 Electronic Fuse Evaluation Board
NIS5452MT1GEVB: eFuse Test Board with Multiple Subcircuits for Evaluation of Overvoltage Protection, Overcurrent Protection, Controlled Slew Rate, and Thermal Shutdown Features Evaluation Board
The NIS5452MT1EVB evaluation board has many features which make it simple to observe the functionality and performance of NIS54xx line of eFuses including multiple connectors available for all eFuse pins.
NIS5452MT1GEVB: eFuse Test Board with Multiple Subcircuits for Evaluation of Overvoltage Protection, Overcurrent Protection, Controlled Slew Rate, and Thermal Shutdown Features Evaluation Board
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