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Home > Products > Integrated Circuits (ICs) > Interface > Specialized

Texas Instruments PCA9548APW

Name: PCA9548APW
Brand: Texas Instruments
SKU: PCA9548APW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PCA9548APW

Manufacturer:: Texas Instruments

Category:: Specialized

Package:: 24-TSSOP (0.173", 4.40mm Width)

Datasheet:: PCA9548APW.pdf

Description:: IC INTERFACE SPECIALIZED 24TSSOP

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Product details

Overview

PCA9548APW from Texas Instruments is an 8-channel bidirectional I²C bus switch with voltage-level translation, active-low reset, and hardware address selection (A0–A2). It operates from 2.3 V to 5.5 V, supports up to 400 kHz clock frequency, features <10 Ω typical R_ON, and enables resolution of I²C slave address conflicts in multi-sensor server and industrial control systems.

For engineers reviewing the PCA9548APW datasheet, PCA9548APW pinout, PCA9548APW application, or PCA9548APW equivalent, key selection criteria include channel count, reset functionality, I²C timing compliance (Standard/Fast Mode), voltage translation capability across 1.8 V/2.5 V/3.3 V/5 V domains, and TSSOP-24 package compatibility with space-constrained PCB layouts.

Technical Context

The PCA9548APW implements eight independent bidirectional pass-gate switches controlled via a single 8-bit I²C register, where each bit enables one SCn/SDn channel. Its internal state machine initializes on power-up or RESET assertion, deselecting all channels and clearing bus arbitration faults.

It supports voltage translation by isolating upstream SCL/SDA from downstream SCn/SDn pairs-each pair uses independent external pull-ups to its target voltage (e.g., 1.8 V sensor on SC0/SD0, 5 V EEPROM on SC7/SD7), while all I/O pins remain 5-V tolerant and R_ON stays ≤12 Ω at 3.3 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Channels	8 independent bidirectional I²C switch channels (SC0/SD0 to SC7/SD7)
Supply Voltage	2.3 V to 5.5 V - enables direct integration into mixed-voltage systems without level shifters
I²C Clock Frequency	0–400 kHz - fully compliant with Standard-Mode (100 kHz) and Fast-Mode (400 kHz) I²C specifications
On-Resistance (R_ON)	≤12 Ω at 3.3 V - ensures minimal signal degradation and timing skew for high-speed I²C buses
Reset Input	Active-low, asynchronous - recovers stuck buses without power cycling; minimum pulse width 6 ns
Voltage Translation	1.8 V ↔ 5 V - allows interoperability between low-voltage sensors and legacy 5 V peripherals using separate pull-ups
ESD Rating	±2000 V HBM - meets industrial-grade robustness requirements for board-level handling and field operation

Pinout & Package

TSSOP-24 (PW) package: 7.80 mm × 4.40 mm body size, surface-mount, leaded, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
A0–A2	Hardware address inputs	Set device I²C slave address (3 bits → up to 8 devices on same bus); tied to VCC/GND
RESET	Active-low reset input	Asynchronously clears control register and deselects all channels; requires external pull-up to VCC
SCL / SDA	Upstream I²C bus interface	Connects to master processor; bidirectional, 5-V tolerant, requires external pull-up
SC0–SC7 / SD0–SD7	Downstream I²C channel pairs	Eight isolated I²C segments; each pair supports independent voltage domains via local pull-ups
VCC	Supply voltage input	Power source for logic and switch circuitry; also defines maximum pass-through voltage for translation
GND	Ground reference	Common return path for all channels and logic; must be low-impedance for noise immunity

Key Features

Feature	Design Value
1-of-8 channel selection	Single 8-bit I²C register controls any combination of enabled channels - simplifies firmware configuration and dynamic re-routing
No glitch on power-up	Internal POR ensures all channels deselected at startup - prevents unintended slave access during boot
Hot insertion support	Controlled turn-on/off sequencing and latch-up immunity (>100 mA) - safe for live-backplane or modular system upgrades
Low standby current	≤2 μA at 2.7 V - critical for battery-backed or always-on monitoring subsystems
5-V tolerant I/O	All pins withstand 5 V regardless of VCC - eliminates need for external clamping diodes in mixed-supply designs

Applications

Server Rack Management	Industrial PLC I/O Expansion
Use Scenario: A rack-mounted server uses eight identical temperature sensors (e.g., TMP102) on a single I²C bus, but all share the same slave address. IC Role / Device Role / Timing Role: PCA9548APW acts as an address-multiplexing switch, isolating each sensor onto its own channel (SC0/SD0–SC7/SD7) to enable individual readout. Use Value: Eliminates need for custom sensor firmware or hardware address jumpers; supports hot-swap sensor replacement without bus lockup.	Use Scenario: An industrial PLC adds multiple I²C-based analog input modules (e.g., ADS1115), each requiring unique addressing and 3.3 V operation, while the main controller runs at 5 V. IC Role / Device Role / Timing Role: PCA9548APW provides voltage translation and channel isolation between the 5 V master and eight 3.3 V slave modules. Use Value: Enables direct connection without discrete level shifters; maintains Fast-Mode timing integrity across voltage domains.
Telecom Router Backplane Monitoring	Factory Automation Sensor Hub
Use Scenario: A telecom router monitors voltage, temperature, and fan status across 12 line cards using identical I²C PMBus sensors, constrained by limited I²C address space. IC Role / Device Role / Timing Role: PCA9548APW routes master commands to specific line card sensor groups via programmable channel enable bits. Use Value: Reduces I²C bus capacitance loading per segment; prevents cross-talk and timing violations in dense backplane environments.	Use Scenario: A factory automation controller integrates humidity, pressure, and gas sensors - some 1.8 V, others 5 V - all sharing one microcontroller I²C port. IC Role / Device Role / Timing Role: PCA9548APW serves as a configurable voltage-translating hub, assigning each sensor type to a dedicated channel with appropriate pull-up voltage. Use Value: Consolidates heterogeneous sensor interfaces into one MCU port; avoids redesign when adding new sensor families.

Server Rack Management

Industrial PLC I/O Expansion

Use Scenario: A rack-mounted server uses eight identical temperature sensors (e.g., TMP102) on a single I²C bus, but all share the same slave address.

IC Role / Device Role / Timing Role: PCA9548APW acts as an address-multiplexing switch, isolating each sensor onto its own channel (SC0/SD0–SC7/SD7) to enable individual readout.

Use Value: Eliminates need for custom sensor firmware or hardware address jumpers; supports hot-swap sensor replacement without bus lockup.

Use Scenario: An industrial PLC adds multiple I²C-based analog input modules (e.g., ADS1115), each requiring unique addressing and 3.3 V operation, while the main controller runs at 5 V.

IC Role / Device Role / Timing Role: PCA9548APW provides voltage translation and channel isolation between the 5 V master and eight 3.3 V slave modules.

Use Value: Enables direct connection without discrete level shifters; maintains Fast-Mode timing integrity across voltage domains.

Telecom Router Backplane Monitoring

Factory Automation Sensor Hub

Use Scenario: A telecom router monitors voltage, temperature, and fan status across 12 line cards using identical I²C PMBus sensors, constrained by limited I²C address space.

IC Role / Device Role / Timing Role: PCA9548APW routes master commands to specific line card sensor groups via programmable channel enable bits.

Use Value: Reduces I²C bus capacitance loading per segment; prevents cross-talk and timing violations in dense backplane environments.

Use Scenario: A factory automation controller integrates humidity, pressure, and gas sensors - some 1.8 V, others 5 V - all sharing one microcontroller I²C port.

IC Role / Device Role / Timing Role: PCA9548APW serves as a configurable voltage-translating hub, assigning each sensor type to a dedicated channel with appropriate pull-up voltage.

Use Value: Consolidates heterogeneous sensor interfaces into one MCU port; avoids redesign when adding new sensor families.

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
NXP PCA9546ADW	4-channel only; no RESET pin; identical TSSOP-24 package and 2.3–5.5 V range	Limited to simpler topologies with ≤4 address-conflicted slaves; lacks fault recovery capability	Select when channel count and reset are not required - lower cost and smaller footprint for basic expansion
ON Semiconductor NLVM2232MUTAG	2-channel, push-pull output, no I²C control interface; requires GPIO control; 1.65–5.5 V	Not software-configurable; no address resolution - used only for static, dual-bus isolation	Choose for fixed dual-path routing where I²C overhead is undesirable and reset is handled externally

Compared with PCA9546ADW and NLVM2232MUTAG, the PCA9548APW uniquely delivers 8-channel programmability, integrated reset recovery, and full I²C voltage translation - making it the only option for scalable, fault-resilient, multi-voltage I²C expansion in space-constrained server and industrial designs.

Availability

PCA9548APW is available at Aetrix Electronics and suitable for server rack management, industrial PLC I/O expansion, and telecom router backplane monitoring requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for PCA9548APW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader focused on analog and embedded processing technologies, serving industrial, automotive, and communications markets with high-reliability, application-optimized ICs.

The PCA9548A product line was designed specifically to solve I²C bus congestion and slave address conflicts in dense, multi-peripheral systems - enabling scalable sensor, power, and thermal monitoring architectures without protocol modification.

FAQ

What is the maximum I²C clock frequency supported by the PCA9548APW?

The PCA9548APW supports I²C clock frequencies up to 400 kHz, meeting Fast-Mode specification requirements. This is confirmed in Section 6.6 of the datasheet, which specifies timing parameters for both Standard-Mode (100 kHz) and Fast-Mode (400 kHz) operation, including t_sch, t_scl, and t_buf. The PCA9548APW maintains signal integrity at this rate due to low R_ON (<12 Ω) and controlled propagation delay (<1 ns).

How does the PCA9548APW resolve I²C slave address conflicts?

The PCA9548APW resolves I²C slave address conflicts by providing eight electrically isolated downstream I²C channels (SC0/SD0 through SC7/SD7). Each channel can host identical slave devices (e.g., eight TMP102 temperature sensors), and the master selects only one channel at a time via the PCA9548APW's 8-bit control register. This prevents address collisions while maintaining full I²C protocol transparency.

Can the PCA9548APW translate between different I²C bus voltages?

Yes, the PCA9548APW enables voltage-level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V I²C buses. Its pass-gate architecture allows each SCn/SDn channel to use independent external pull-up resistors tied to its target voltage domain, while all I/O pins remain 5-V tolerant. This capability is explicitly stated in the Features section and validated in Section 8.1 of the PCA9548APW datasheet.

What is the function of the RESET pin on the PCA9548APW?

The RESET pin on the PCA9548APW is an active-low asynchronous input that forces the device to clear its control register, deselect all channels, and reinitialize the I²C state machine - recovering from bus lockup (e.g., a stuck SDA line) without power cycling. It requires a minimum 6 ns low pulse and must be pulled up to VCC externally, as specified in Section 5 and Section 8.4.1 of the PCA9548APW datasheet.

Which package variant does the PCA9548APW correspond to?

The PCA9548APW corresponds to the TSSOP-24 (PW) package: 7.80 mm × 4.40 mm body size, surface-mount, with 0.65 mm lead pitch. This is confirmed in the "Device Information" table and Figure 5-1 of the PCA9548APW datasheet, where "PW" is explicitly listed alongside "TSSOP (24)" and dimensional data.

PCA9548APW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 24-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Obsolete

Applications:: Translating Switch

Interface:: I2C, SMBus

Voltage - Supply:: 2.3V ~ 5.5V

Supplier Device Package:: 24-TSSOP

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

PCA9548APW FAQ

1.How can I place an order for PCA9548APW through Aetrix?

Please submit a Request for Quotation (RFQ) for PCA9548APW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PCA9548APW reliable?

The price and inventory of PCA9548APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9548APW is usually 5 days.

3.What payment methods are accepted for PCA9548APW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9548APW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PCA9548APW?

PCA9548APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PCA9548APW order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PCA9548APW?

For technical support, including PCA9548APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9548APW requirements.

6.How does Aetrix verify that PCA9548APW is sourced from the original manufacturer or authorized distributors?

All PCA9548APW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PCA9548APW meets industry standards.

7.What is the process for return or replacement of PCA9548APW?

All PCA9548APW units undergo pre-shipment inspection (PSI). If there is an issue with PCA9548APW, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PCA9548APW part is unused and in its original packaging.

Return procedure for PCA9548APW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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