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. 162-7918
Mfr. Part No.TPS2511DGN
HK$14.72
Each (In a Tube of 80)
units
High Side 1 120mΩ Internally Limited Surface Mount MSOP 8 3330mA 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +85 °C
RS Stock No. 812-0408
Mfr. Part No.TPS2511DGN
HK$14.72
Each (In a Pack of 10)
units
High Side 1 120mΩ Internally Limited Surface Mount MSOP 8 3330mA 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +85 °C
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. 165-8353
Mfr. Part No.AP2337SA-7
HK$1.11
Each (On a Reel of 3000)
units
High Side 1 170mΩ Internally Limited Surface Mount SOT-23 3 1.9A 3 x 1.4 x 1.1mm 3mm 1.4mm 1.1mm 5.5 V +85 °C
RS Stock No. 730-0657
Mfr. Part No.TPS2540RTET
HK$18.40
Each
units
High Side 1 120mΩ Internally Limited Surface Mount WQFN 16 2.8A 3.15 x 3.15 x 0.75mm 3.15mm 3.15mm 0.75mm 5.5 V +85 °C
RS Stock No. 864-4743
Mfr. Part No.FSUSB42MUX
HK$2.19
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. 168-4137
Mfr. Part No.TPS2540RTET
HK$12.49
Each (On a Reel of 250)
units
High Side 1 120mΩ Internally Limited Surface Mount WQFN 16 2.8A 3.15 x 3.15 x 0.75mm 3.15mm 3.15mm 0.75mm 5.5 V +85 °C
RS Stock No. 921-0470
Mfr. Part No.AP2337SA-7
HK$3.18
Each (In a Pack of 30)
units
High Side 1 170mΩ Internally Limited Surface Mount SOT-23 3 1.9A 3 x 1.4 x 1.1mm 3mm 1.4mm 1.1mm 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. 662-2460
Mfr. Part No.TPS2052BDGN
HK$19.00
Each (In a Pack of 5)
units
High Side, USB Power Distribution 4 70mΩ 1.71 W Surface Mount MSOP 8 1.25A 3 x 3 x 1.02mm 3mm 3mm 1.02mm 5.5 V +85 °C
RS Stock No. 517-1078
Mfr. Part No.TPS2042AD
HK$26.95
Each (In a Pack of 5)
units
High Side, USB Power Distribution 4 80mΩ 725 mW Surface Mount SOIC 8 0.9A 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm 5.5 V +85 °C
RS Stock No. 111-5720
Mfr. Part No.UPD1002-A/MQ
BrandMicrochip
HK$17.63
Each (In a Pack of 5)
units
USB Power Distribution - - - Surface Mount SQFN 32 - 5.1 x 5.1 x 0.95mm 5.1mm 5.1mm 0.95mm 6 V +70 °C
RS Stock No. 665-8894
Mfr. Part No.TPS2150IPWP
HK$33.46
Each (In a Pack of 5)
units
- - - Internally Limited Surface Mount HTSSOP 14 - 5 x 4.4 x 1.15mm 5mm 4.4mm 1.15mm - +85 °C
RS Stock No. 809-9887
Mfr. Part No.ADP198ACBZ-R7
HK$9.50
Each (On a Tape of 5)
units
High Side 1 90mΩ - Surface Mount WLCSP 4 - 0.99 x 1.065 x 0.37mm 0.99mm 1.065mm 0.37mm 6.5 V +85 °C
RS Stock No. 662-2457
Mfr. Part No.TPS2051BDGN
HK$15.49
Each (In a Pack of 5)
units
High Side, USB Power Distribution 4 70mΩ 1.71 W Surface Mount MSOP 8 1.25A 3 x 3 x 1.02mm 3mm 3mm 1.02mm 5.5 V +85 °C
RS Stock No. 905-4652
Mfr. Part No.1304
HK$52.44
Each
units
USB - - - Panel Mount - - 500mA 30 x 12.5 x 8mm 30mm 12.5mm 8mm 4.2 V -
RS Stock No. 145-9140
Mfr. Part No.MIC2076-1YM
BrandMicrochip
HK$8.598
Each (In a Tube of 95)
units
High Side, USB Power Distribution - - Internally Limited Surface Mount SOIC 8 0.9A 5 x 3.99 x 1.63mm 5mm 3.99mm 1.63mm 5.5 V +85 °C
RS Stock No. 165-4071
Mfr. Part No.MIC2005-0.5YM6-TR
BrandMicrochip
HK$5.853
Each (On a Reel of 3000)
units
High Side, USB Power Distribution 1 275mΩ Internally Limited Surface Mount SOT-23 6 0.9A 2.9 x 1.6 x 0.9mm 2.9mm 1.6mm 0.9mm 5.5 V +85 °C
RS Stock No. 171-2070
Mfr. Part No.BD6517F-E2
BrandROHM
HK$9.58
Each (On a Reel of 2500)
units
High Side 2 180Ω 670 mW Surface Mount SOP 8 1.65A 5 x 4.4 x 1.5mm 5mm 4.4mm 1.5mm 5.5 V +85 °C
RS Stock No. 122-3267
Mfr. Part No.AP2111SG-13
HK$2.33
Each (On a Reel of 2500)
units
High Side 2 170mΩ Internally Limited Surface Mount SOIC 8 2.8A 4.95 x 3.95 x 1.5mm 4.95mm 3.95mm 1.5mm 5.5 V +85 °C
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