PCA9546APWE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments PCA9546APWE4 is a 4-channel I2C and SMBus multiplexer/switch IC in a 16-pin TSSOP package with 45Ω maximum on-state resistance. It enables one master to communicate with multiple I2C slave devices sharing the same address, simplifying complex bus architectures in embedded systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- PCA9546APWE4 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
What are the key features of PCA9546APWE4?
- 4-channel I2C and SMBus multiplexer allowing a single master to address up to 4 independent bus segments
- 45Ω maximum on-state resistance in 16-pin TSSOP-16 package with 0.65mm pitch for compact PCB integration
- Supports standard (100 kHz), fast (400 kHz), and fast-plus (1 MHz) I2C modes for flexible multi-slave bus designs
What is PCA9546APWE4 used for?
The PCA9546APWE4 is used in server and industrial motherboard designs where multiple identical I2C devices such as temperature sensors, EEPROMs, or power management ICs share the same 7-bit address. It enables a single I2C master to selectively enable one of 4 downstream bus branches, isolating address conflicts and simplifying firmware addressing logic. Common applications include DDR memory thermal monitoring, multi-zone battery management systems, and camera sensor arrays in embedded vision platforms.
What are the specifications of PCA9546APWE4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Analog IC - Other Type | SINGLE-ENDED MULTIPLEXER |
| JESD-30 Code | R-PDSO-G16 |
| Number of Channels | 4 |
| Number of Functions | 1 |
| On-state Resistance-Max (Ron) | 45Ω |
| Output | SEPARATE OUTPUT |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Supply Current-Max (Isup) | 0.012mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 2.3V |
| Supply Voltage-Nom (Vsup) | 2.5V |
| Surface Mount | YES |
| Switch-off Time-Max | 1ns |
| Switch-on Time-Max | 1ns |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Where can I find the PCA9546APWE4 datasheet?
PCA9546APWE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for PCA9546APWE4?
Compatible alternatives and drop-in replacements for PCA9546APWE4:
Frequently Asked Questions
How does the PCA9546APWE4 resolve I2C address conflicts when multiple identical sensors share a single bus?
The PCA9546APWE4 places each identical sensor on one of its 4 independent I2C bus channels, allowing the master to select only one active channel at a time. By enabling channel 0, 1, 2, or 3 sequentially via the 16-pin TSSOP control register, the host communicates with each sensor at the same 7-bit address without conflict, supporting standard 100 kHz through fast-plus 1 MHz I2C speeds.
What is the on-state resistance of the PCA9546APWE4, and how does it affect bus signal integrity at 400 kHz?
The PCA9546APWE4 has a maximum on-state resistance of 45Ω per channel. At 400 kHz fast-mode I2C, this resistance combined with bus capacitance of 100 pF creates an RC time constant of approximately 4.5 ns, well within the 1.2 µs rise-time budget allowed by the I2C specification, ensuring clean signal edges without additional buffers in typical designs.
Is the PCA9546APWE4 suitable as a replacement for the PCA9544A in existing 4-channel I2C mux designs?
The PCA9546APWE4 is functionally similar to the PCA9544A but differs in interrupt handling and channel selection logic. The PCA9546A selects channels independently without interrupt masking, while the PCA9544A includes an interrupt pin with masking per channel. A direct pin-for-pin swap in the 16-pin TSSOP footprint is possible if the design does not rely on the interrupt aggregation feature present in the PCA9544A.
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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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