News
2026.07.16
The high-voltage, high-current, reusable electronic fuse FA7671/FA7671A with reverse current protection function using on-resistance control goes on the market
Hsinchu, July 16, 2026 -- Fortune Advanced Technology today launched its high-voltage, high-current electronic fuse (eFuse) FA7671/FA7671A with reverse current protection function using on-resistance control
The 36V electronic fuse (eFuse) product series of Fortune Advanced Technology includes the FA7641, FA7642, FA7671 and FA7671A, which support various protection functions required for circuit protection in the power lines, such as overvoltage protection and overcurrent protection. For more information, please refer to “Home > Products > eFuse > 36V eFuse”.
The most significant feature of this IC is that it can be used repeatedly.
Conventional thermal fuses (glass tube fuses and chip-type fuses) protect power line circuits by fusing the built-in alloy parts due to Joule heat when the current exceeds the rated value. However, these thermal fuses have some shortcomings, such as slow fusing time, indefinite breaking current, and the need for replacement work once they are broken. Unlike conventional fuses, electronic fuses have a fast current blocking function, because the built-in MOSFET is quickly turned off when excessive current flows. Based on the above reasons, they will not be destroyed by a single over-current event and can be reset and reused. Therefore, these products can reduce maintenance costs and shorten repair time.
The second feature is that it can also merge various protection functions such as over-voltage protection, over-temperature protection, and short-circuit protection. When over-voltage, severe overheating or unexpected short-circuit occurs, it can immediately cut off the power.
The third feature is that eFuse achieves much simpler circuit designs with fewer components and a smaller PCB board area than discrete components.
The fourth feature is that these eFuses can be used in an ultra-wide power supply input voltage range of 4.5V to 30V, and the absolute maximum ratings of the input/output voltage are up to 36V.
The fifth feature is that the FA7671 and FA7671A are low RDS(ON) electronic fuses capable of driving continuous high currents up to 5A.
The sixth feature is that the overcurrent threshold can be set by an external resistor, which is more accurate than a thermal fuse. The only difference between FA7671 and FA7671A is the formula for setting the overcurrent threshold.
The seventh feature is that the overvoltage threshold can be set through an external resistor to prevent excessive voltage from being applied to the load.
The eighth feature is that it provides an open drain output to signal warnings when over current protection, over voltage protection, short circuit protection, reverse current protection, or over temperature protection is triggered.
The ninth feature is that it provides open-drain power good indicator output to notify the next-stage power supply that its output voltage has reached the normal level.
The tenth feature is that it provides a reverse current blocking function when the FA7671/FA7671A is disabled, and a reverse current protection (RCP) function when the FA7671/FA7671A is enabled. The FA7671/FA7671A power switch consists of 2 back-to-back cascaded N-channel MOSFETs. When the power switch is turned off, the back-to-back cascaded body diodes of MOSFETs can prevent current from the output port to the input port, this is the reverse current blocking function; When the switch is turned on, whenever the output voltage exceeds the input voltage by 50mV, the FA7671/FA7671A will turn off the power path immediately, this is the reverse current protection function.
The reverse current protection function of the FA7671/FA7671A employs an on-resistance control mechanism. When the forward current decreases, this mechanism adjusts the gate drive voltage of the MOSFET to increase the on-resistance of the MOSFET. This adjustment ensures that the output voltage exceeds the input voltage by 50mV during a reverse current event (e.g., during slow voltage ramp at output, or when the input power supply droops or gets disconnected). This triggers the reverse current protection function to disconnect the power switch, thereby thereby avoiding input rail from getting slowly charged up to output voltage. It also prevents incorrect power supply presence indication in applications which sense the input voltage to detect if the input power supply is disconnected.
The eleventh feature is that FA7671/FA7671A integrates a Fast Role Swap (FRS) function. When the output voltage of the power path drops from more than 50mV above the input voltage to below the input voltage, the rise time of the soft start is shortened, and the power path will turn on immediately within 100μs, meeting the USB PD application requirement of completing the power role swap within 150μs.
Combining the above perfect features, this series of products can provide strong protection for electronic equipment such as Industrial PCs, networked communication/set-top boxes, and laptop computers.
This product lineup provides auto-retry type of products, that is, the eFuse recovers the circuit by itself. The power switch periodically performs soft start process until the over current protection condition is removed.
Package and availability
The FA7671 and FA7671A are now available through authorized distributors in the QFN2x3-8L package. Full and custom quantity reels are available.
About Fortune Advanced Technology
Fortune Advanced Technology Co., Ltd. was established in 2013 focusing on high-voltage mixed-signal power management solutions. We dedicate to meeting the emerging requirements for lower power consumption at the standby stage.
We have successfully developed the first application-oriented PMIC for TV/Monitor TV/STB applications.
It is a digitally controlled multichannel PMIC capable of achieving total 0.15Watt standby power consumption under 230VAC for the whole TV system, which is at the forefront of the IC design industry. Based on this technology, we have successively developed diverse and competitive products widely used in LCD TV, motherboards/AIO, networked communication devices/STB, notebooks computers, and other fields.
We hope to grow into the best power partner to provide high-efficiency and cost-effective power solutions to our customers. Aware of the adverse effects of global warming, we will continue to strive for energy saving.
Trademarks
All registered trademarks and other trademarks belong to their respective owners.
SOURCE Fortune Advanced Technology
The 36V electronic fuse (eFuse) product series of Fortune Advanced Technology includes the FA7641, FA7642, FA7671 and FA7671A, which support various protection functions required for circuit protection in the power lines, such as overvoltage protection and overcurrent protection. For more information, please refer to “Home > Products > eFuse > 36V eFuse”.
The most significant feature of this IC is that it can be used repeatedly.
Conventional thermal fuses (glass tube fuses and chip-type fuses) protect power line circuits by fusing the built-in alloy parts due to Joule heat when the current exceeds the rated value. However, these thermal fuses have some shortcomings, such as slow fusing time, indefinite breaking current, and the need for replacement work once they are broken. Unlike conventional fuses, electronic fuses have a fast current blocking function, because the built-in MOSFET is quickly turned off when excessive current flows. Based on the above reasons, they will not be destroyed by a single over-current event and can be reset and reused. Therefore, these products can reduce maintenance costs and shorten repair time.
The second feature is that it can also merge various protection functions such as over-voltage protection, over-temperature protection, and short-circuit protection. When over-voltage, severe overheating or unexpected short-circuit occurs, it can immediately cut off the power.
The third feature is that eFuse achieves much simpler circuit designs with fewer components and a smaller PCB board area than discrete components.
The fourth feature is that these eFuses can be used in an ultra-wide power supply input voltage range of 4.5V to 30V, and the absolute maximum ratings of the input/output voltage are up to 36V.
The fifth feature is that the FA7671 and FA7671A are low RDS(ON) electronic fuses capable of driving continuous high currents up to 5A.
The sixth feature is that the overcurrent threshold can be set by an external resistor, which is more accurate than a thermal fuse. The only difference between FA7671 and FA7671A is the formula for setting the overcurrent threshold.
The seventh feature is that the overvoltage threshold can be set through an external resistor to prevent excessive voltage from being applied to the load.
The eighth feature is that it provides an open drain output to signal warnings when over current protection, over voltage protection, short circuit protection, reverse current protection, or over temperature protection is triggered.
The ninth feature is that it provides open-drain power good indicator output to notify the next-stage power supply that its output voltage has reached the normal level.
The tenth feature is that it provides a reverse current blocking function when the FA7671/FA7671A is disabled, and a reverse current protection (RCP) function when the FA7671/FA7671A is enabled. The FA7671/FA7671A power switch consists of 2 back-to-back cascaded N-channel MOSFETs. When the power switch is turned off, the back-to-back cascaded body diodes of MOSFETs can prevent current from the output port to the input port, this is the reverse current blocking function; When the switch is turned on, whenever the output voltage exceeds the input voltage by 50mV, the FA7671/FA7671A will turn off the power path immediately, this is the reverse current protection function.
The reverse current protection function of the FA7671/FA7671A employs an on-resistance control mechanism. When the forward current decreases, this mechanism adjusts the gate drive voltage of the MOSFET to increase the on-resistance of the MOSFET. This adjustment ensures that the output voltage exceeds the input voltage by 50mV during a reverse current event (e.g., during slow voltage ramp at output, or when the input power supply droops or gets disconnected). This triggers the reverse current protection function to disconnect the power switch, thereby thereby avoiding input rail from getting slowly charged up to output voltage. It also prevents incorrect power supply presence indication in applications which sense the input voltage to detect if the input power supply is disconnected.
The eleventh feature is that FA7671/FA7671A integrates a Fast Role Swap (FRS) function. When the output voltage of the power path drops from more than 50mV above the input voltage to below the input voltage, the rise time of the soft start is shortened, and the power path will turn on immediately within 100μs, meeting the USB PD application requirement of completing the power role swap within 150μs.
Combining the above perfect features, this series of products can provide strong protection for electronic equipment such as Industrial PCs, networked communication/set-top boxes, and laptop computers.
This product lineup provides auto-retry type of products, that is, the eFuse recovers the circuit by itself. The power switch periodically performs soft start process until the over current protection condition is removed.
Package and availability
The FA7671 and FA7671A are now available through authorized distributors in the QFN2x3-8L package. Full and custom quantity reels are available.
About Fortune Advanced Technology
Fortune Advanced Technology Co., Ltd. was established in 2013 focusing on high-voltage mixed-signal power management solutions. We dedicate to meeting the emerging requirements for lower power consumption at the standby stage.
We have successfully developed the first application-oriented PMIC for TV/Monitor TV/STB applications.
It is a digitally controlled multichannel PMIC capable of achieving total 0.15Watt standby power consumption under 230VAC for the whole TV system, which is at the forefront of the IC design industry. Based on this technology, we have successively developed diverse and competitive products widely used in LCD TV, motherboards/AIO, networked communication devices/STB, notebooks computers, and other fields.
We hope to grow into the best power partner to provide high-efficiency and cost-effective power solutions to our customers. Aware of the adverse effects of global warming, we will continue to strive for energy saving.
Trademarks
All registered trademarks and other trademarks belong to their respective owners.
SOURCE Fortune Advanced Technology