PCA9548A: 8-channel I²C-bus switch with reset

The PCA9548A is an octal bidirectional translating switch controlled via the I²C-bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register.

An active LOW reset input allows the PCA9548A to recover from a situation where one of the downstream I²C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the I²C-bus state machine and causes all the channels to be deselected as does the internal Power-on reset function.

The pass gates of the switches are constructed such that the VDD pin can be used to limit the maximum high voltage which will be passed by the PCA9548A. This allows the use of different bus voltages on each pair, so that 1.8 V or 2.5 V or 3.3 V parts can communicate with 5 V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 6 V tolerant.

PCA9548A: Product Block Diagram
Outline 3d SOT137-1
Data Sheets (1)
Name/DescriptionModified Date
8-channel I2C-bus switch with reset (REV 5.1) PDF (301.0 kB) PCA9548A01 Oct 2015
Application Notes (2)
Name/DescriptionModified Date
Level shifting techniques in I2C-bus design (REV 1.0) PDF (52.0 kB) AN1044120 Jun 2007
PCA954X FAMILY OF I²C / SMBus MULTIPLEXERS and SWITCHES (REV 2.0) PDF (807.0 kB) AN26201 Oct 2004
Users Guides (3)
Name/DescriptionModified Date
I2C-bus specification and user manual (REV 6.0) PDF (1.4 MB) UM1020428 Apr 2014
I2C-bus specification and user manual (REV 5.0) PDF (1.6 MB) UM10204_JA03 Apr 2013
I2C Demonstration Board 2005-1 Quick Start Guide (REV 1.0) PDF (261.0 kB) UM1020613 Jun 2006
Brochures (2)
Name/DescriptionModified Date
NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns (REV 1.0) PDF (3.5 MB) 7501754001 Aug 2014
Add design fl exibility with multi-channel I2C/SMBus muxes and switches; NXP® 2-, 4-, and 8-channel... (REV 1.0) PDF (641.0 kB) 7501652901 Jul 2008
Package Information (3)
Name/DescriptionModified Date
plastic small outline package; 24 leads; body width 7.5 mm (REV 1.0) PDF (379.0 kB) SOT137-108 Feb 2016
plastic thin shrink small outline package; 24 leads; body width 4.4 mm (REV 1.0) PDF (353.0 kB) SOT355-108 Feb 2016
plastic thermal enhanced very thin quad flat package; no leads; 24 terminals; body 4 x 4 x 0.85 mm (REV 1.0) PDF (202.0 kB) SOT616-108 Feb 2016
Packing (4)
Name/DescriptionModified Date
HVQFN24; Reel pack; SMD, 13", Q2/T3 Turned product orientation Orderable part number ending ,128 or HP Ordering code... (REV 1.0) PDF (185.0 kB) SOT616-1_12816 Jul 2014
HVQFN24; reel pack; standard product orientation; 12NC ending 118 (REV 1.0) PDF (196.0 kB) SOT616-1_11816 Jan 2014
TSSOP24; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 4.1) PDF (227.0 kB) SOT355-1_11815 Apr 2013
SO24; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... (REV 4.0) PDF (235.0 kB) SOT137-1_11812 Apr 2013
Supporting Information (2)
Name/DescriptionModified Date
Footprint for wave soldering (REV 1.0) PDF (8.0 kB) SO-SOJ-WAVE08 Oct 2009
Footprint for wave soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-WAVE08 Oct 2009
Design Support
IBIS Model
Ordering Information
ProductStatus
PCA9548APWActive
PCA9548ABSActive
PCA9548ADActive
Package Information
Product IDPackage DescriptionOutline VersionReflow/Wave SolderingPackingProduct StatusPart NumberOrdering code(12NC)MarkingChemical ContentRoHS / Pb Free / RHFLeadFree Conversion DateEFRIFR(FIT)MTBF(hour)MSLMSL LF
PCA9548ABSSOT616-1Reel 13" Q2/T3ActivePCA9548ABSHP (9352 758 14128)548APCA9548ABSAlways Pb-free0.02.05E811
Reel 13" Q1/T1ActivePCA9548ABS,118 (9352 758 14118)548APCA9548ABSAlways Pb-free0.02.05E811
PCA9548APWSOT355-1SSOP-TSSOP-VSO-WAVEReel 13" Q1/T1ActivePCA9548APW,118 (9352 758 16118)PCA9548APCA9548APWweek 13, 20050.02.05E811
Bulk PackActivePCA9548APW,112 (9352 758 16112)PCA9548APCA9548APWweek 13, 20050.02.05E811
PCA9548ADSOT137-1SO-SOJ-WAVEReel 13" Q1/T1ActivePCA9548AD,118 (9352 758 15118)PCA9548ADPCA9548ADweek 13, 20050.02.05E811
Bulk PackActivePCA9548AD,112 (9352 758 15112)PCA9548ADPCA9548ADweek 13, 20050.02.05E811
8-channel I2C-bus switch with reset pca9548a
Level shifting techniques in I2C-bus design pca9685pw
PCA954X FAMILY OF I²C / SMBus MULTIPLEXERS and SWITCHES pca9516apw
I2C-bus specification and user manual pca9685pw
I2C-bus specification and user manual pca9685pw
I2C Demonstration Board 2005-1 Quick Start Guide pca9685pw
NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns pca9685pw
Add design fl exibility with multi-channel I2C/SMBus muxes and switches; NXP® 2-, 4-, and 8-channel... pca9548a
Expert mode sample code PCA9548A PCA9548APW
PCA9548A IBIS model PCA9548APW
plastic thermal enhanced very thin quad flat package; no leads; 24 terminals; body 4 x 4 x 0.85 mm TFF1007HN
HVQFN24; Reel pack; SMD, 13", Q2/T3 Turned product orientation Orderable part number ending ,128 or HP Ordering code... pca9548a
HVQFN24; reel pack; standard product orientation; 12NC ending 118 TFF1007HN
plastic thin shrink small outline package; 24 leads; body width 4.4 mm 74LVC4245A_Q100
SSOP-TSSOP-VSO-WAVE LPC1114FDH28
TSSOP24; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... 74LVC4245A_Q100
plastic small outline package; 24 leads; body width 7.5 mm 74LVC4245A_Q100
Footprint for wave soldering NPIC6C596A_Q100
SO24; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... 74LVC4245A_Q100
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