News
2026.08.17
The low-voltage 2.5A reusable electronic fuses FA7623B and FA7623D goes on the market
Hsinchu, August 17, 2026 -- Fortune Advanced Technology today launched its new low-voltage 2.5A reusable electronic fuse ICs FA7623B and FA7623D
The USB Type-A VBUS eFuse product series of Fortune Advanced Technology includes six products FA7623BCA5R/FA7623BDA5R/FA7623BEA5R/FA7623BFA5R/FA7623DMA6R/FA7623DNA6R, 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 > USB Type-A Solutions > Type-A VBUS eFuse.
The most significant feature of the eFuse 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 IC’s are low RDS(ON) electronic fuses capable of driving continuous currents up to 2.5A.
The fifth feature is that the overcurrent threshold is more accurate than a thermal fuse. The overcurrent protection threshold of FA7623B is a fixed value. The overcurrent protection threshold of FA7623D is adjusted by an external resistor.
The sixth feature is that FA7623B and FA7623D integrate overvoltage protection for the output pin. When the output voltage exceeds 5.7V (typ.), the switch will be turned off to protect the low-voltage input stage during reverse blocking application.
The seventh feature is that it provides an open drain output to signal warnings when over current protection, over voltage protection, or over temperature protection is triggered.
The eighth feature is that the FA7623B/FA7623D integrates a true reverse-current blocking function which protects the input source against current flow from output to input regardless of whether the switch is on or off. When the switch is turned on, whenever the output voltage exceeds the input voltage by 50mV, the FA7623B/FA7623D will turn off the power path immediately.
In summary, our type-A VBUS eFuses are to protect the power source connected to the USB Type-A port from overcurrent, short circuit, output overvoltage, or output reverse-current conditions. The eFuse is controlled by an ON/OFF control input (EN/ENb), which is capable of interfacing directly with a low-voltage control signal. A 90Ω on-chip load resistor is built in to fast discharge the output when the switch is turned off.
The FA7623/FA7623D provides an open-drain output (FLAGb) pin that is asserted (active low) when over-current, short-circuit or over-temperature condition occurs. The FLAGb signal remains asserted until the fault condition is removed and the FA7623B/FA7623D resumes normal operation.
The FA7623BCA5R/FA7623BEA5R/FA7623DMA6R is enabled by the ON/OFF control pin (EN) when it is active high. The FA7623BDA5R/FA7623BFA5R/FA7623DNA6R is enabled by the ON/OFF control pin (ENb) when it is active low.
Package and availability
The FA7623BCA5R, FA7623BDA5R, FA7623BEA5R, and FA7623BFA5R are now available through authorized distributors in the TSOT-23-5L package. The FA7623DMA6R and FA7623DNA6R are now available through authorized distributors in the TSOT-23-6L 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 USB Type-A VBUS eFuse product series of Fortune Advanced Technology includes six products FA7623BCA5R/FA7623BDA5R/FA7623BEA5R/FA7623BFA5R/FA7623DMA6R/FA7623DNA6R, 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 > USB Type-A Solutions > Type-A VBUS eFuse.
The most significant feature of the eFuse 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 IC’s are low RDS(ON) electronic fuses capable of driving continuous currents up to 2.5A.
The fifth feature is that the overcurrent threshold is more accurate than a thermal fuse. The overcurrent protection threshold of FA7623B is a fixed value. The overcurrent protection threshold of FA7623D is adjusted by an external resistor.
The sixth feature is that FA7623B and FA7623D integrate overvoltage protection for the output pin. When the output voltage exceeds 5.7V (typ.), the switch will be turned off to protect the low-voltage input stage during reverse blocking application.
The seventh feature is that it provides an open drain output to signal warnings when over current protection, over voltage protection, or over temperature protection is triggered.
The eighth feature is that the FA7623B/FA7623D integrates a true reverse-current blocking function which protects the input source against current flow from output to input regardless of whether the switch is on or off. When the switch is turned on, whenever the output voltage exceeds the input voltage by 50mV, the FA7623B/FA7623D will turn off the power path immediately.
In summary, our type-A VBUS eFuses are to protect the power source connected to the USB Type-A port from overcurrent, short circuit, output overvoltage, or output reverse-current conditions. The eFuse is controlled by an ON/OFF control input (EN/ENb), which is capable of interfacing directly with a low-voltage control signal. A 90Ω on-chip load resistor is built in to fast discharge the output when the switch is turned off.
The FA7623/FA7623D provides an open-drain output (FLAGb) pin that is asserted (active low) when over-current, short-circuit or over-temperature condition occurs. The FLAGb signal remains asserted until the fault condition is removed and the FA7623B/FA7623D resumes normal operation.
The FA7623BCA5R/FA7623BEA5R/FA7623DMA6R is enabled by the ON/OFF control pin (EN) when it is active high. The FA7623BDA5R/FA7623BFA5R/FA7623DNA6R is enabled by the ON/OFF control pin (ENb) when it is active low.
Package and availability
The FA7623BCA5R, FA7623BDA5R, FA7623BEA5R, and FA7623BFA5R are now available through authorized distributors in the TSOT-23-5L package. The FA7623DMA6R and FA7623DNA6R are now available through authorized distributors in the TSOT-23-6L 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