TCA9548APW Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The TCA9548APW is a low-voltage 8-channel I2C bus switch from Texas Instruments with integrated reset in a 24-pin TSSOP package. It supports up to 8 separate I2C downstream channels with 70 ohm maximum on-state resistance and operates from 1.8V to 5.5V. In stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 24
- Lifecycle
- OBSOLETE
- Datasheet
- TCA9548APW Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8 independently selectable I2C channels resolve address conflicts between identical sensors on a single master bus
- Low 70 ohm maximum on-state resistance minimizes bus capacitance impact at Fast-Mode Plus 1 MHz I2C speeds
- Active-low reset pin allows hardware recovery from a bus lockup condition without power cycling the system
- Wide 1.8V to 5.5V supply range enables mixed-voltage system integration between 1.8V MCUs and 5V legacy peripherals
Applications
The TCA9548APW solves I2C address conflicts in systems with multiple identical sensors, such as multi-axis IMU arrays, multi-zone temperature monitor networks, and modular display driver stacks. It is commonly deployed in server DIMM power management buses, where up to 8 memory slots share the same SMBUS I2C addresses. The 24-pin TSSOP package fits standard PCB libraries and enables dense multi-channel layouts in rack-mount industrial controllers.
Specifications
| YTEOL | 0 |
| Analog IC - Other Type | SINGLE-ENDED MULTIPLEXER |
| JESD-30 Code | R-PDSO-G24 |
| Normal Position | NO/NC |
| Number of Channels | 8 |
| Number of Functions | 2 |
| On-state Resistance-Max (Ron) | 70Ω |
| Output | SEPARATE OUTPUT |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP24,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Supply Current-Max (Isup) | 0.08mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 1.65V |
| Supply Voltage-Nom (Vsup) | 2.5V |
| Surface Mount | YES |
| Switching | BREAK-BEFORE-MAKE |
| Technology | CMOS |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for TCA9548APW:
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Frequently Asked Questions
How does the TCA9548APW resolve I2C address conflicts when multiple identical sensors share a bus?
The TCA9548APW connects only one of its 8 downstream channel ports to the master at a time, isolating the other 7. Since each channel is electrically separated, you can connect up to 8 sensors with the same 7-bit I2C address across different channels. The switch itself is selected via a 3-bit address (A0–A2), allowing up to 8 TCA9548APW devices on one master bus for 64 isolated sensor channels total.
At what I2C speed does the TCA9548APW operate, and does the 70 ohm on-resistance limit Fast-Mode Plus performance?
The TCA9548APW supports Standard Mode (100 kHz), Fast Mode (400 kHz), and Fast-Mode Plus (1 MHz) I2C. The 70 ohm maximum on-resistance adds to the bus pull-up circuit but remains within Fast-Mode Plus timing budgets when combined with a 1 kohm pull-up to 3.3V, keeping rise times below 120 ns as required by the I2C specification.
How can the TCA9548APW's hardware reset pin recover a frozen I2C bus without rebooting the host processor?
Asserting the active-low RESET pin for at least 500 ns clears all channel selections and disconnects all 8 downstream ports, releasing SDA and SCL lines that may be stuck low due to a peripheral NAK or clock-stretch lockup. The host GPIO then de-asserts RESET and re-selects the desired channel, restoring normal I2C communication in less than 1 µs without a full system power cycle.
Can TCA9548APW directly interface a 1.8V MCU with 5V I2C peripherals on downstream channels?
Yes. The TCA9548APW operates from 1.8V to 5.5V supply, and each downstream channel's I/O is referenced to VCC independently. By powering the upstream side at 1.8V and downstream channels at 5V through separate pull-up resistors, it acts as a voltage-level translator for I2C signals between a 1.8V MCU and 5V peripherals across all 8 channels, avoiding external level-shifter ICs.
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Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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