Two-Channel I²C-Bus Multiplexer

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The PCA9540B is a 1-of-2 bidirectional translating multiplexer, controlled via the I²C-bus. The SCL/SDA upstream pair fans out to two SCx/SDx downstream pairs, or channels. Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register.

A power-on reset function puts the registers in their default state and initializes the I²C-bus state machine with no channels selected.

The pass gates of the multiplexer are constructed such that the V_DD pin can be used to limit the maximum high voltage that is passed by the PCA9540B. This allows the use of different bus voltages on each SCx/SDx pair, so that 1.8 V, 2.5 V or 3.3 V parts can communicate with 5 V parts without any additional protection. External pull-up resistors can pull the bus up to the desired voltage level for this channel. All I/O pins are 5 V tolerant.

Data Sheet

Application Notes

Product Details

Block Diagram

PCA9540B

Get diagram PDF

Features

Key Features

1-of-2 bidirectional translating multiplexer
I²C-bus interface logic; compatible with SMBus standards
Channel selection via I²C-bus
Power-up with all multiplexer channels deselected
Low R_on switches
Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses
No glitch on power-up
Supports hot insertion
Low standby current
Operating power supply voltage range of 2.3 V to 5.5 V
5 V tolerant inputs
0 Hz to 400 kHz clock frequency
ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
Packages offered: SO8, TSSOP8, XSON8

Buy/Parametrics

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Documentation

Quick reference to our documentation types.

1-5 of 16 documents

^{Data Sheet}
2-channel I2C-bus multiplexer

PDFRev 7.1Jan 19, 2018355.0 KBPCA9540BEnglish
^{Application Note}
AN10343: MicroPak Soldering Information Data Sheet

PDFRev 2.0Dec 30, 2010251.4 KBAN10343English
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^{Application Note}
AN10441, Level Shifting Techniques in I²C-Bus Design - Application Note

PDFRev 1.0Jun 20, 200753.7 KBAN10441English
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^{Application Note}
AN262

PDFRev 2.0Oct 1, 2004826.2 KBAN262English
^{User Guide}
I2C-bus specification and user manual

PDFRev 7.0Oct 1, 2021751.0 KBUM10204English, 日本語
^{User Guide}
PCA9632 demonstration board OM13269

PDFRev 1.0Feb 6, 2012749.6 KBUM10528English
Sign in required
^Brochure
Add design fl exibility with multi-channel I2C/SMBus muxes and switches; NXP 2-, 4-, and 8-channel I2C/SMBus muxes and switches PCA954x

PDFRev 1.0Apr 8, 2018656.7 KB75016529English
^{Fact Sheet}
PCA9XX FactSheet

PDFRev 1May 10, 2019436.6 KBPCA9XX-FACTSHEETEnglish
^{Package Information}
Plastic, small outline package; 8 terminals; 1.27 mm pitch; 4.9 mm x 3.9 mm x 1.75 mm body

PDFRev 1.1Jan 9, 2017175.4 KBSOT96-1English
^{Package Information}
Plastic extremely thin small outline package; no leads; 8 terminals; body 3 x 2 x 0.5 mm

PDFRev 1.0Feb 8, 2016194.8 KBSOT996-2English
^{Packing Information}
XSON8(U); Reel pack, Reverse; SMD, 7" Q3/T4 Standard product orientation Orderable part number ending ,125 or H Ordering code (12NC) ending 125

PDFRev 5.0May 2, 2013205.2 KBSOT996-2_125English
^{Packing Information}
SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118

PDFRev 2.0Apr 19, 2013237.4 KBSOT96-1_118English
Sign in required
^{Packing Information}
TSSOP8; Reel pack; SMD, 13"Q1/T1 Standard product orientationOrderable part number ending ,118 or JOrdering code (12NC) ending 118

PDFRev 1.0Apr 15, 2013218.8 KBSOT505-1_118English
^{Supporting Information}
Reflow Soldering Profile

PDFRev 1.0Feb 17, 201434.6 KBREFLOW_SOLDERING_PROFILEEnglish
^{Supporting Information}
Footprint for Wave Soldering

PDFRev 1.0Oct 8, 20098.3 KBSO-SOJ-WAVEEnglish
^{Supporting Information}
Footprint for reflow soldering

PDFRev 1.0Oct 8, 20098.8 KBSO-SOJ-REFLOWEnglish

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Design Resources

Design Files

Quick reference to our design files types.

5 design files

Receive the full breakdown. See the product footprint and more in the eCad file.

^Models
PCA9540B IBIS model

ZIPRev 1.0Sep 2, 2014 00:00:0026.1 KBPCA9540B_1
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^{Symbols and Footprints}
PCA9540BDP-Q900-TSSOP8-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Jun 22, 2020 13:34:0042.8 KBPCA9540BDP-Q900-TSSOP8-BXL
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^{Symbols and Footprints}
PCA9540BD-SO8-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Jun 22, 2020 13:34:0038.0 KBPCA9540BD-SO8-BXL
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^{Symbols and Footprints}
PCA9540BGD-XSON8-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Jun 22, 2020 13:34:0041.9 KBPCA9540BGD-XSON8-BXL
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^{Symbols and Footprints}
PCA9540BDP-TSSOP8-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 16, 2020 12:56:0043.6 KBPCA9540BDP-TSSOP8-BXL
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Support

What do you need help with?

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Other NXP Products

Two-Channel I²C-Bus Multiplexer

Product Details

Block Diagram

PCA9540B

Features

Key Features

Buy/Parametrics

Documentation

Filter by

2-channel I2C-bus multiplexer

AN10343: MicroPak Soldering Information Data Sheet

AN10441, Level Shifting Techniques in I²C-Bus Design - Application Note

AN262

I2C-bus specification and user manual

PCA9632 demonstration board OM13269

Add design fl exibility with multi-channel I2C/SMBus muxes and switches; NXP 2-, 4-, and 8-channel I2C/SMBus muxes and switches PCA954x

PCA9XX FactSheet

Plastic, small outline package; 8 terminals; 1.27 mm pitch; 4.9 mm x 3.9 mm x 1.75 mm body

Plastic extremely thin small outline package; no leads; 8 terminals; body 3 x 2 x 0.5 mm

XSON8(U); Reel pack, Reverse; SMD, 7" Q3/T4 Standard product orientation Orderable part number ending ,125 or H Ordering code (12NC) ending 125

SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118

TSSOP8; Reel pack; SMD, 13"Q1/T1 Standard product orientationOrderable part number ending ,118 or JOrdering code (12NC) ending 118

Reflow Soldering Profile

Footprint for Wave Soldering

Footprint for reflow soldering

Design Resources

Design Files

Filter by

PCA9540B IBIS model

PCA9540BDP-Q900-TSSOP8-CAD Symbol and PCB Footprint – BXL File

PCA9540BD-SO8-CAD Symbol and PCB Footprint – BXL File

PCA9540BGD-XSON8-CAD Symbol and PCB Footprint – BXL File

PCA9540BDP-TSSOP8-CAD Symbol and PCB Footprint – BXL File

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Support

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Recommended Communities

Two-Channel I2C-Bus Multiplexer

Product Details

Block Diagram

PCA9540B

Features

Key Features

Buy/Parametrics

Documentation

Filter by

Design Resources

Design Files

Filter by

PCA9540B IBIS model

PCA9540BDP-Q900-TSSOP8-CAD Symbol and PCB Footprint – BXL File

PCA9540BD-SO8-CAD Symbol and PCB Footprint – BXL File

PCA9540BGD-XSON8-CAD Symbol and PCB Footprint – BXL File

PCA9540BDP-TSSOP8-CAD Symbol and PCB Footprint – BXL File

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Support

What do you need help with?

Recommended Communities

Two-Channel I²C-Bus Multiplexer