USB Power Switches

USB power switches are power management devices used to charge electronic devices on USB ports and hubs on computers, docking stations, handheld devices and automotive devices. 


How do USB power switches work?

They work by monitoring the current on a device and latch a switch off if the output current is shorted. They often have an auto reset feature which reactivates the switch once the short circuit is removed. They work in the same way as hot swap controllers, which allow circuit boards and electronic cards to be inserted into equipment, removing the need to power down during use.


Features of USB power switches

Most USB power switches have multiple safety features. For instance, built in thermal-overload protection limits junction temperature and dissipation of power. 


The internal circuity is limited to an accurate figure to protect the input supply against short circuit conditions as well as overload. They're also fitted with fault signals that notify the microprocessor whenever there's a current-limit, under voltage lockout (UVLO), short-circuit fault or thermal overload.


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Description Price Switch Type Number of Outputs Switch On Resistance Maximum Power Dissipation Mounting Type Package Type Pin Count Current Limit Dimensions Length Width Height Maximum Input Voltage Maximum Operating Temperature
RS Stock No. 739-5144
Mfr. Part No.FSUSB42MUX
HK$13.12
Each
units
- 2 6.5Ω - Surface Mount MSOP 10 - 3 x 3 x 0.7mm 3mm 3mm 0.7mm - +85 °C
RS Stock No. 864-4743
Mfr. Part No.FSUSB42MUX
HK$2.088
Each (On a Reel of 4000)
units
- 1 6.5Ω - Surface Mount MSOP 10 - 3 x 3 x 0.85mm 3mm 3mm 0.85mm - +85 °C
New
RS Stock No. 178-4635
Mfr. Part No.FSUSB242UCX
HK$4.671
Each (In a Pack of 10)
units
USB 2 - Surface Mount WLCSP 9 - 1.26 x 1.26 x 0.31mm 1.26mm 1.26mm 0.31mm 5.5 V +85 °C
RS Stock No. 169-8565
Mfr. Part No.FSUSB45UMX
HK$4.667
Each (On a Reel of 5000)
units
- - 0.65Ω - Surface Mount UMLP 10 - 1.8 x 1.4 x 0.5mm 1.8mm 1.4mm 0.5mm 4.3 V +85 °C
RS Stock No. 862-8906
Mfr. Part No.FSA832L10X
HK$4.503
Each (In a Pack of 25)
units
Isolation 1 - Surface Mount MicroPak 10 - 2.1 x 1.6 x 0.5mm 2.1mm 1.6mm 0.5mm 6 V +85 °C
New
RS Stock No. 178-4474
Mfr. Part No.FUSB307BMPX
HK$11.648
Each (In a Pack of 10)
units
USB 1 - - Surface Mount WQFN 16 210.5mA 3 x 3 x 0.75mm 3mm 3mm 0.75mm 21.5 V +85 °C
RS Stock No. 169-8760
Mfr. Part No.FSA880UMX
HK$3.374
Each (On a Reel of 5000)
units
High Side - - - Surface Mount UMLP 16 - 1.8 x 2.6 x 0.5mm 1.8mm 2.6mm 0.5mm 4.4 V +85 °C
New
RS Stock No. 178-4452
Mfr. Part No.FUSB303TMX
HK$3.394
Each (In a Pack of 50)
units
USB 1 - - Surface Mount QFN 12 - 1.65 x 1.65 x 0.35mm 1.65mm 1.65mm 0.35mm 22 V +85 °C
RS Stock No. 135-8667
Mfr. Part No.FUSB252UMX
HK$5.692
Each (On a Reel of 5000)
units
High Speed Digital 2 480mΩ - Surface Mount UMLP 16 1A 1.8 x 2.6 x 0.5mm 1.8mm 2.6mm 0.5mm 5.5 V +85 °C
New
RS Stock No. 178-4282
Mfr. Part No.FSUSB242UCX
HK$2.177
Each (On a Reel of 3000)
units
USB 2 - Surface Mount WLCSP 9 - 1.26 x 1.26 x 0.31mm 1.26mm 1.26mm 0.31mm 5.5 V +85 °C
RS Stock No. 670-9999
Mfr. Part No.FSUSB30MUX
HK$6.598
Each (In a Pack of 5)
units
- 1 10Ω - Surface Mount MSOP 10 - 3 x 3 x 1.1mm 3mm 3mm 1.1mm - +85 °C
RS Stock No. 807-6005
Mfr. Part No.FSA880UMX
HK$5.192
Each (In a Pack of 10)
units
High Side - - - Surface Mount UMLP 16 - 1.8 x 2.6 x 0.5mm 1.8mm 2.6mm 0.5mm 4.4 V +85 °C
RS Stock No. 739-5153
Mfr. Part No.FSUSB45UMX
HK$14.49
Each
units
- - 0.65Ω - Surface Mount UMLP 10 - 1.8 x 1.4 x 0.5mm 1.8mm 1.4mm 0.5mm 4.3 V +85 °C
New
RS Stock No. 178-4287
Mfr. Part No.FUSB303TMX
HK$1.811
Each (On a Reel of 5000)
units
USB 1 - - Surface Mount QFN 12 - 1.65 x 1.65 x 0.35mm 1.65mm 1.65mm 0.35mm 22 V +85 °C
RS Stock No. 809-4996
Mfr. Part No.FAN3989MLP8X
HK$7.722
Each (On a Tape of 5)
units
- 1 - - Surface Mount MLP 8 1.5A 3 x 3 x 0.75mm 3mm 3mm 0.75mm 20 V +85 °C
RS Stock No. 166-2142
Mfr. Part No.FSA9280AUMX
HK$8.169
Each (On a Reel of 5000)
units
USB Accessory Detection Switch 1 10Ω - Surface Mount UMLP 20 - 3 x 4 x 0.5mm 3mm 4mm 0.5mm 4.4 V +85 °C
New
RS Stock No. 178-4289
Mfr. Part No.FUSB307BMPX
HK$6.213
Each (On a Reel of 3000)
units
USB 1 - - Surface Mount WQFN 16 210.5mA 3 x 3 x 0.75mm 3mm 3mm 0.75mm 21.5 V +85 °C
RS Stock No. 862-8912
Mfr. Part No.FSA9280AUMX
HK$12.48
Each (In a Pack of 5)
units
USB Accessory Detection Switch 1 10Ω - Surface Mount UMLP 20 - 3 x 4 x 0.5mm 3mm 4mm 0.5mm 4.4 V +85 °C
New
RS Stock No. 178-4411
Mfr. Part No.FUSB302BVMPX
HK$15.582
Each (In a Pack of 10)
units
USB 1 - - Surface Mount WQFN 14 - 2.5 x 2.5 x 0.72mm 2.5mm 2.5mm 0.72mm 21 V +105 °C
RS Stock No. 166-2029
Mfr. Part No.FSA832L10X
HK$3.221
Each (On a Reel of 5000)
units
Isolation 1 - Surface Mount MicroPak 10 - 2.1 x 1.6 x 0.5mm 2.1mm 1.6mm 0.5mm 6 V +85 °C