Name: LowVoltage Translating 8Bit I²CBusSMBus IO Expander
Price: 0.74 USD
Availability: InStock

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Products
Interfaces
I²C, SPI, I3C Interface Devices
General Purpose I/O (GPIO)
- PCA6408A
- PCA6416A
- PCA8574/74A
- PCA8575
- PCA9500
- PCA9501
- PCA9502BS
- PCA9505/06
- PCA9534
- PCA9535A
- PCA9535_PCA9535C
- PCA9536
- PCA9537DP
- PCA9538
- PCA9538A
- PCA9539A
- PCA9539_PCA9539R
- PCA9554B_PCA9554C
- PCA9554_PCA9554A
- PCA9555
- PCA9555A
- PCA9557
- PCA9570
- PCA9574
- PCA9575
- PCA9670BS
- PCA9670PW
- PCA9671
- PCA9672
- PCA9673
- PCA9674_PCA9674A
- PCA9675
- PCA9698
- PCA9701_PCA9702
- PCA9703
- PCA9704PW
- PCAL6408A
- PCAL6416A
- PCAL6416AEX
- PCAL6524
- PCAL6534
- PCAL9535A
- PCAL9538A
- PCAL9539A
- PCAL9554B; PCAL9554C
- PCAL9555A
- PCAL9714
- PCAL9722
- PCF8574/74A
- PCF8575
PCAL6408A

The PCAL6408A is an 8-bit I²C GPIO expander with integrated interrupt and reset functionality, purpose-built to expand microcontroller I/O. Featuring built-in level shifting and a wide 1.65 V to 5.5 V operating range, it enables seamless communication across mixed-voltage systems.

With advanced Agile I/O features and flexible package options, the PCAL6408A adapts to a wide range of applications. As a pin-to-pin drop-in replacement that is fully software backward-compatible with the PCA6408A, it offers a simple, reliable upgrade path for existing designs.

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Data Sheet

Application Notes

Product Details

Block Diagram

PCAL6408A

Get diagram PDF

Features

Key Features

I²C-bus to parallel port expander
Operating power supply voltage range of 1.65 V to 5.5 V
Allows bidirectional voltage-level translation and GPIO expansion between:
- 1.8 V SCL/SDA and 1.8 V, 2.5 V, 3.3 V or 5 V Port P
- 2.5 V SCL/SDA and 1.8 V, 2.5 V, 3.3 V or 5 V Port P
- 3.3 V SCL/SDA and 1.8 V, 2.5 V, 3.3 V or 5 V Port P
- 5 V SCL/SDA and 1.8 V, 2.5 V, 3.3 V or 5 V Port P
Low standby current consumption of 1 μA
Schmitt-trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs:
- V_hys = 0.18 V (typical) at 1.8 V
- V_hys = 0.25 V (typical) at 2.5 V
- V_hys = 0.33 V (typical) at 3.3 V
- V_hys = 0.5 V (typical) at 5 V
5 V tolerant I/O ports
Active LOW reset input (RESET)
Open-drain active LOW interrupt output (INT)
400 kHz Fast-mode I²C-bus
Internal power-on reset
Power-up with all channels configured as inputs
No glitch on power-up
Noise filter on SCL/SDA inputs
Latched outputs with 25 mA drive maximum capability for directly driving LEDs
Latch-up performance exceeds 100 mA per JESD 78, Class II
ESD protection exceeds JESD 22:
- 2000 V Human-Body Model (A114-A)
- 1000 V Charged-Device Model (C101)
Packages offered: HVQFN16, TSSOP16, XQFN16, XFBGA16 (1.6 mm x 1.6 mm x 0.5 mm), X2QFN16 (1.6 mm x 1.6 mm x 0.35 mm)

Agile I/O Features

Software backward compatible with PCA6408A with interrupts disabled at power-up
Pin-to-pin drop-in replacement for PCA6408A
Output port configuration: bank selectable push-pull or open-drain output stages
Interrupt status: read-only register identifies the source of an interrupt
Bit-wise I/O programming features:
- Output drive strength: four programmable drive strengths to reduce rise and fall times in low-capacitance applications
- Input latch: Input Port register values changes are kept until the Input Port register is read
- Pull-up/pull-down enable: floating input or pull-up/pull-down resistor enable
- Pull-up/pull-down selection: 100 kΩ pull-up/pull-down resistor selection
- Interrupt mask: mask prevents the generation of the interrupt when input changes state to prevent spurious interrupts

Product Programs

Product Longevity

Participating products are available for a minimum of 10 years. Designated participating products developed for the automotive, telecom and medical segments are available for a minimum of 15 years.

Buy/Parametrics

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Documentation

Quick reference to our documentation types

9 documents

Compact List

Low Voltage Agile I/O GPIO Input/Output Characteristics[AN11496]

PDFAug 15, 2014Rev 1.0

PCAL6408A, Low-Voltage Translating, 8-Bit I²C-Bus/SMBus I/O Expander with Interrupt Output, Reset and Configuration Registers Data Sheet[PCAL6408A]

HTML | PDFOct 24, 2025Rev 3.5

SOT758-1[SOT758-1]

PDFSep 29, 2025Rev O
SOT1161-1[SOT1161-1]

PDFSep 29, 2025Rev O
SOT1896-1[SOT1896-1]

PDFSep 26, 2025Rev O
plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body[SOT403-1]

PDFDec 10, 2019Rev 1.2

TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118[SOT403-1_118]

PDFApr 8, 2013Rev 1.0
Standard product orientation 12NC ending 115[SOT1161-1_115]

PDFApr 5, 2013Rev 2.0

Footprint for wave soldering[SSOP-TSSOP-VSO-WAVE]

PDFOct 8, 2009Rev 1.0

Design Resources

Design Files

Quick reference to our design files types.

4 design files

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

Symbols and Footprints
PCAL6408AHK-XQFN16-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Jul 9, 2020 13:13:0050.32 KBPCAL6408AHK-XQFN16-BXL
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Symbols and Footprints
PCAL6408ABS-HVQFN16-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Jul 9, 2020 13:13:0049.91 KBPCAL6408ABS-HVQFN16-BXL
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Symbols and Footprints
PCAL6408AEX1-X2QFN16-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Jul 9, 2020 13:13:0034.77 KBPCAL6408AEX1-X2QFN16-BXL
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Design Files - miscellaneous
Expert mode sample code for 8-bit Totem Pole

TXTRev 1.0Dec 10, 2014 00:00:001.99 KB8-BIT-TOTEM-POLE-READ-WRITE
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Hardware

Quick reference to our board types.

1-5 of 6 hardware offerings

Evaluation and Development Boards
i.MX 95 19mm x 19mm Evaluation Kit
Active

IMX95LPD5EVK-19
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FRDM i.MX 95 Pro: Wi‑Fi 6 Tri‑Radio and Dual M.2 Expansion Development Board for Edge AI Applications
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FRDM-IMX95-PRO
Evaluation and Development Boards
PCAL6408A 8-Bit GPIO Arduino^® Shield

PCAL6408A-ARD
Evaluation and Development Boards
FRDM i.MX 91 Development Board
Active

FRDM-IMX91
Evaluation and Development Boards
FRDM i.MX 93 Development Board
Active

FRDM-IMX93
Evaluation and Development Boards
FRDM i.MX 95 Development Board
Active

FRDM-IMX95

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Engineering Services

To get further assistance directly from NXP, please see our Engineering Services.

1 engineering service

Independent Design House (IDH)
Embedded Software Design

By TAGnology RFID GmbH GoldHQ: Voitsberg, AustriaSupporting Regions: EMEA

To find additional partner offerings that support this product, visit our Partner Marketplace.

Training

1 trainings

On-Demand
NXP’s differentiating GPIO expanders address system challenges in emerging applications

32 minEnglish

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Low-Voltage Translating, 8-Bit I²C-Bus/SMBus I/O Expander

Product Details

Block Diagram

PCAL6408A

Features

Key Features

Agile I/O Features

Product Programs

Product Longevity

Buy/Parametrics

Documentation

Filter by

Application Note (1)

Low Voltage Agile I/O GPIO Input/Output Characteristics[AN11496]

Data Sheet (1)

PCAL6408A, Low-Voltage Translating, 8-Bit I²C-Bus/SMBus I/O Expander with Interrupt Output, Reset and Configuration Registers Data Sheet[PCAL6408A]

Package Information (4)

SOT758-1[SOT758-1]

SOT1161-1[SOT1161-1]

SOT1896-1[SOT1896-1]

plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body[SOT403-1]

Packing Information (2)

TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118[SOT403-1_118]

Standard product orientation 12NC ending 115[SOT1161-1_115]

Supporting Information (1)

Footprint for wave soldering[SSOP-TSSOP-VSO-WAVE]

Design Resources

Design Files

Filter by

PCAL6408AHK-XQFN16-CAD Symbol and PCB Footprint – BXL File

PCAL6408ABS-HVQFN16-CAD Symbol and PCB Footprint – BXL File

PCAL6408AEX1-X2QFN16-CAD Symbol and PCB Footprint – BXL File

Expert mode sample code for 8-bit Totem Pole

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