PCA9543APW Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments PCA9543APW is a dual 2:1 I2C multiplexer supporting 2.3V to 5.5V operation with interrupt logic and reset. Enables channel isolation in multi-sensor designs. From $0.546, in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 14
- Lifecycle
- OBSOLETE
- Datasheet
- PCA9543APW Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.5460(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual 2:1 I2C/SMBus multiplexer with independent channel selection for bus isolation
- Wide supply voltage range: 2.3V to 5.5V, compatible with 3.3V and 5V systems
- Integrated interrupt logic passes INT signals from downstream devices to upstream master
- Active-low reset input for reliable system initialization and fault recovery
- 14-pin TSSOP package enables compact PCB layout in space-constrained designs
Applications
The PCA9543APW is widely used in embedded systems and IoT designs where multiple I2C sensors or peripherals share the same bus addresses. It is ideal for server management boards, industrial controllers, and smart home devices that require isolated I2C segments to prevent address conflicts. The multiplexer also supports battery-powered applications thanks to its low supply current and broad voltage compatibility.
Specifications
| YTEOL | 0 |
| Analog IC - Other Type | SINGLE-ENDED MULTIPLEXER |
| JESD-30 Code | R-PDSO-G14 |
| Number of Channels | 2 |
| Number of Functions | 1 |
| Output | COMMON OUTPUT |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP14,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 2.3V |
| Supply Voltage-Nom (Vsup) | 3.3V |
| Surface Mount | YES |
| 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) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the supply voltage range for the PCA9543APW?
The PCA9543APW operates from 2.3V to 5.5V, making it compatible with both 3.3V and 5V logic systems. This wide range ensures flexibility across a variety of microcontroller and processor platforms without level-shifting circuitry.
How does the PCA9543APW handle I2C address conflicts?
The PCA9543APW resolves I2C address conflicts by routing traffic through one of two selectable channels at a time. Only the active channel is connected to the downstream bus, ensuring that devices sharing the same 7-bit address on separate channels never collide on the same bus segment.
What package does the PCA9543APW use and what are its pin dimensions?
The PCA9543APW comes in a 14-pin TSSOP (Thin Shrink Small Outline Package) with a 0.65mm pitch, designated TSSOP14. This compact surface-mount package is suitable for high-density PCB designs and is compatible with standard reflow soldering processes.
Can the PCA9543APW pass interrupt signals from downstream I2C devices?
Yes, the PCA9543APW features dedicated interrupt inputs (INT0, INT1) that aggregate interrupt signals from downstream devices and forward them to the upstream I2C master. This allows the host controller to efficiently poll or respond to events without continuously scanning each bus segment.
Related Guides
TPS54160DGQR Selection Guide: How to Choose a 60V Step-Down Buck Converter
Complete selection guide for the TPS54160DGQR 60V/1.5A step-down converter. Compare specs, alternatives, and sourcing options for industrial and automotive designs.
May 20, 2026
LMV932MM Dual Low-Voltage CMOS Op-Amp: Application Design Guide
Complete application design guide for the LMV932MM dual rail-to-rail CMOS op-amp: supply decoupling, RRIO design rules, stability, and recommended circuits for 1.8V–5.5V battery-powered systems.
May 20, 2026
TL084CN Equivalent and Replacements: JFET-Input Quad Op-Amp Comparison Guide
Compare TL084CN with TL074, LF347, and LM324 quad op-amps. Pin-compatible equivalents, key specs, and when to choose each for your analog design.
May 20, 2026
TPS386000RGPR Quad Voltage Supervisor: Selection and Sourcing Guide (2025)
Compare TPS386000RGPR with TPS386040RGPR, TPS3700, and TPS3823 voltage supervisors. Key specs, threshold programming, watchdog options, and sourcing tips.
May 20, 2026
Why Buy from FindMyChip
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.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.8200 | $1.82 |
| 15+ | $0.9100 | $13.65 |
| 67+ | $0.5460 | $36.58 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“FindMyChip sourced our entire STM32 BOM in 48 hours when our usual distributor had 16-week lead times.”