PCA9546ADG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The PCA9546ADG4 is a 4-channel I2C and SMBus multiplexer from Texas Instruments, enabling up to 4 independent bidirectional I2C buses with voltage translation support from 1.8 V to 5.5 V. It provides bus isolation and active-low reset for fault recovery. Available in stock with worldwide shipping from authorized distributors.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- PCA9546ADG4 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of PCA9546ADG4?
- 4-channel bidirectional I2C and SMBus multiplexer with independent channel enable via 3-wire I2C control
- Wide supply voltage range of 1.8 V to 5.5 V with integrated level shifting between channels of different voltages
- Active-low reset pin for bus fault recovery and channel deselection without power cycling
What is PCA9546ADG4 used for?
The PCA9546ADG4 is used in multi-sensor systems where multiple identical I2C devices share the same address, allowing the host controller to select one of 4 isolated channels at a time. It is common in display subsystems, battery management boards, and modular embedded designs that need voltage-level-translated I2C communication between 1.8 V and 3.3 V or 5 V domains. Its SMBus compatibility also makes it a standard choice for server management and power monitoring platforms requiring robust fault isolation.
What are the specifications of PCA9546ADG4?
| YTEOL | 0 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Where can I find the PCA9546ADG4 datasheet?
PCA9546ADG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for PCA9546ADG4?
Compatible alternatives and drop-in replacements for PCA9546ADG4:
Frequently Asked Questions
What supply voltage range does PCA9546ADG4 support for I2C level translation?
The PCA9546ADG4 operates from a supply voltage of 1.8 V to 5.5 V and can translate I2C signals between channels at different logic levels, such as 1.8 V and 3.3 V or 3.3 V and 5 V. This makes it directly compatible with modern low-voltage MCUs and legacy 5 V peripherals on the same board without separate level-shifter ICs.
How does PCA9546ADG4 handle bus fault recovery in multi-device I2C systems?
PCA9546ADG4 includes an active-low hardware reset pin that deselects all 4 I2C channels simultaneously, allowing the host to recover from a stuck-bus condition or I2C lockup within a single reset pulse. This bus isolation capability prevents a fault on one channel from propagating to the other 3 channels, improving overall system reliability in designs with multiple I2C peripherals.
When should PCA9546ADG4 be used instead of PCA9545ADG4 in a sensor hub design?
Choose PCA9546ADG4 over PCA9545A when your design requires 4 channels without interrupt-signal routing, since PCA9546A omits the interrupt output pins present on PCA9545A. The PCA9546ADG4 is a simpler and often lower-cost solution for systems where the host MCU polls I2C sensors directly and does not need per-channel interrupt aggregation, while still providing full 4-channel bus isolation and 1.8 V to 5.5 V level translation.
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About Texas Instruments
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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