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$5.13
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$1.978
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
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. 186-1262
Mfr. Part No.FUSB307BVMPX
HK$7.894
Each (On a Reel of 3000)
units
USB - - - Surface Mount WQFN 16 210.5mA 3 x 3 x 0.75mm 3mm 3mm 0.75mm 21.5 V +105 °C
RS Stock No. 186-1261
Mfr. Part No.FSA1153UCX
HK$2.921
Each (On a Reel of 3000)
units
USB - - Surface Mount WLCSP 12 - 1.605 x 1.44 x 0.42mm 1.61mm 1.44mm 0.42mm 5.5 V +85 °C
RS Stock No. 186-1487
Mfr. Part No.FSA1153UCX
HK$8.304
Each (In a Pack of 10)
units
USB - - Surface Mount WLCSP 12 - 1.605 x 1.44 x 0.42mm 1.61mm 1.44mm 0.42mm 5.5 V +85 °C
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. 805-7186
Mfr. Part No.NCP383LMUAJAATXG
HK$6.473
Each (In a Pack of 10)
units
High Side 2 95Ω 850 mW Surface Mount UDFN 10 3.01A 3 x 3 x 0.5mm 3mm 3mm 0.5mm 5.5 V +85 °C
RS Stock No. 178-4284
Mfr. Part No.FUSB302BVMPX
HK$8.307
Each (On a Reel of 3000)
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. 864-4712
Mfr. Part No.FSUSB63UMX
HK$3.896
Each (On a Reel of 5000)
units
Multiplexer - - - Surface Mount UMLP 12 - 1.8 x 1.8 x 0.5mm 1.8mm 1.8mm 0.5mm - +85 °C
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. 739-5156
Mfr. Part No.FSUSB63UMX
HK$9.84
Each
units
Analogue - - - Surface Mount UMLP 12 - 1.8 x 1.8 x 0.5mm 1.8mm 1.8mm 0.5mm - +85 °C
RS Stock No. 186-1507
Mfr. Part No.FUSB307BVMPX
HK$27.472
Each (In a Pack of 5)
units
USB - - - Surface Mount WQFN 16 210.5mA 3 x 3 x 0.75mm 3mm 3mm 0.75mm 21.5 V +105 °C
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. 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. 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. 166-2089
Mfr. Part No.FAN3989MLP8X
HK$4.06
Each (On a Reel of 3000)
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. 862-8906
Mfr. Part No.FSA832L10X
HK$5.009
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
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$4.79
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