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NXP Semiconductors PCA9543AD,118
- Part No.:
- PCA9543AD,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
PCA9543AD,118.pdf
- Description:
- IC INTERFACE SPECIALIZED 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,826
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Product details
Overview
The PCA9543AD,118 from NXP Semiconductors is a 2-channel bidirectional I²C-bus switch with integrated interrupt logic and active-low reset, designed to isolate and route I²C traffic between one upstream master and two downstream slave buses. It supports voltage translation across 1.8 V, 2.5 V, 3.3 V, and 5 V domains, features low Ron (≤30 Ω), operates from 2.3 V to 5.5 V, and delivers 0 Hz–400 kHz clock support - enabling use in multi-voltage sensor hubs and modular server management subsystems.
For engineers reviewing the PCA9543AD,118 datasheet, PCA9543AD,118 pinout, PCA9543AD,118 application, or PCA9543AD,118 equivalent, this device serves as a deterministic bus isolation and fault-recovery solution where channel-selectable routing, interrupt aggregation, and bus-level voltage translation are required without protocol modification.
Technical Context
The PCA9543AD,118 implements dual independent pass-gate switches controlled via an 8-bit I²C-accessible control register. Channel selection (SC0/SD0 or SC1/SD1) is determined by B1/B0 bits; both channels may be enabled simultaneously, subject to total bus capacitance limits. The internal state machine resets on power-up or active-low RESET assertion, deselecting all channels and clearing interrupt flags.
Interrupt handling is asynchronous: INT0 and INT1 monitor downstream bus activity independently, while the open-drain INT output reflects their logical AND. The control register's INT0/INT1 bits mirror real-time input states, allowing the master to identify interrupt sources before reconfiguring channel selection - no bus arbitration or protocol extension is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.3 V to 5.5 V - enables direct integration into mixed-voltage systems without external level shifters. |
| I²C Clock Frequency | 0 Hz to 400 kHz - supports standard-mode and fast-mode I²C, compatible with SMBus timing requirements. |
| ON-State Resistance (Ron) | 5 Ω (typ) to 30 Ω (max) - ensures minimal signal degradation and voltage drop across switched SCL/SDA lines. |
| Voltage Translation Support | 1.8 V / 2.5 V / 3.3 V ↔ 5 V - achieved via VDD-referenced pass gates; allows interoperability between legacy and modern voltage domains. |
| Interrupt Logic | Two active-low inputs (INT0, INT1), one active-low open-drain output (INT) - provides hardware-asserted bus event aggregation without software polling overhead. |
| Reset Function | Active-low RESET pin with 4 ns minimum pulse width - recovers stuck buses by resetting internal state machine and deselecting all channels. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial and embedded computing environments including server baseboard management controllers. |
Pinout & Package
PCA9543AD,118 is supplied in SO14 (SOT108-1) package: plastic small outline, 14-lead, 3.9 mm body width, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware address bit 0 | Configures 7-bit I²C slave address; pulled HIGH/LOW to select one of four possible addresses (E0h–E7h). |
| A1 | Hardware address bit 1 | Second address bit; combined with A0, enables up to four PCA9543AD,118 devices on same I²C bus. |
| RESET | Active-low reset input | Forces internal state machine reset and deselects all channels; requires external pull-up resistor. |
| INT0 | Active-low interrupt input 0 | Monitors downstream channel 0 (SC0/SD0); asserted when any connected device pulls line LOW. |
| SD0 | Serial data 0 (channel 0) | Bi-directional I²C data line for downstream channel 0; passes signals only when channel is selected. |
| SC0 | Serial clock 0 (channel 0) | Bi-directional I²C clock line for downstream channel 0; isolated when channel is deselected. |
| VSS | Ground reference | Primary supply return; must be connected to system ground plane for stable operation and ESD path. |
| INT1 | Active-low interrupt input 1 | Monitors downstream channel 1 (SC1/SD1); independent of channel enable state. |
| SD1 | Serial data 1 (channel 1) | Bi-directional I²C data line for downstream channel 1; electrically isolated when unselected. |
| SC1 | Serial clock 1 (channel 1) | Bi-directional I²C clock line for downstream channel 1; prevents cross-talk between channels. |
| INT | Active-low interrupt output | Open-drain AND of INT0 and INT1; drives LOW when either downstream interrupt is asserted. |
| SCL | Upstream serial clock | Master-side I²C clock input; routed to selected downstream SCx line(s) with minimal propagation delay (≤0.3 ns). |
| SDA | Upstream serial data | Master-side I²C data input/output; routed bidirectionally to selected SDx line(s) with 5–30 Ω Ron. |
| VDD | Positive supply voltage | Defines maximum pass-through voltage for level translation; sets Vo(sw) clamping threshold for downstream buses. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional voltage translation | Enables communication between 1.8 V sensors and 5 V microcontrollers using single VDD-supplied pass gates - eliminates discrete level shifters and reduces BOM count. |
| Programmable channel selection | Two independent downstream channels selectable via I²C write to control register (B1/B0 bits), supporting simultaneous activation with bus capacitance awareness. |
| Hardware interrupt aggregation | INT0/INT1 inputs feed open-drain INT output, allowing host MCU to detect and prioritize downstream events without continuous bus scanning. |
| Active-low reset recovery | RESET pin forces immediate channel deselection and state machine reset - critical for recovering from SCL/SDA bus lockup in mission-critical systems. |
| Low standby current | 0.2 µA typical at VDD = 3.6 V - extends battery life in portable instrumentation and IoT edge nodes with infrequent I²C access. |
Applications
| Server Baseboard Management | Industrial Sensor Hub |
|---|---|
Use Scenario: Isolating multiple temperature, voltage, and fan tachometer sensors on separate I²C segments behind a BMC. IC Role / Device Role / Timing Role: I²C bus switch providing deterministic channel routing and interrupt-driven event notification to the BMC. Use Value: Prevents bus contention during hot-swap events and enables rapid identification of faulting sensors via INT0/INT1 status bits in control register. |
Use Scenario: Connecting 1.8 V MEMS accelerometers and 3.3 V environmental sensors to a 5 V microcontroller in factory automation equipment. IC Role / Device Role / Timing Role: Voltage-translating I²C switch enabling mixed-voltage peripheral integration without external level-shifting circuitry. Use Value: Reduces PCB area and component count by consolidating voltage domain bridging into a single 14-pin SOIC device. |
| Modular Power Supply Monitoring | Embedded Test Equipment |
Use Scenario: Routing I²C commands from a main controller to multiple digitally controlled DC-DC converters operating at different voltage rails. IC Role / Device Role / Timing Role: Bidirectional bus isolator with reset-assisted fault recovery for reliable power sequencing and telemetry readback. Use Value: Ensures converter communication remains intact during brown-out conditions via RESET-triggered bus state restoration. |
Use Scenario: Expanding I²C connectivity on a benchtop DMM or signal generator to support calibration EEPROMs, DACs, and front-panel displays. IC Role / Device Role / Timing Role: Configurable 1-to-2 I²C multiplexer enabling dynamic peripheral assignment under firmware control. Use Value: Simplifies test fixture design by allowing shared I²C resources across multiple instrument submodules via software-selectable routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCA9544APWR | 4-channel switch with identical SO14 package, same VDD range and interrupt logic, but adds channel enable mask register and higher max capacitance rating (500 pF vs 400 pF). | Supports larger peripheral counts per bus segment; suitable when future expansion beyond two downstream buses is anticipated. | Select TCA9544APWR if system requires >2 downstream I²C segments or higher bus capacitance tolerance. |
| PCA9546AD,118 | 4-channel variant with identical pinout, control register structure, and voltage translation capability; shares same SO14 footprint and RESET/INT functionality. | Provides additional channel capacity without layout change; maintains full compatibility with existing PCA9543AD,118 firmware drivers. | Choose PCA9546AD,118 when board space is constrained but system scalability demands more than two isolated I²C branches. |
Compared with TCA9544APWR and PCA9546AD,118, the PCA9543AD,118 offers optimal cost and footprint efficiency for precisely two downstream I²C domains, with identical interrupt handling and reset behavior - making it ideal for fixed-configuration systems where channel count is known and stable.
Availability
PCA9543AD,118 is available at Aetrix Electronics and suitable for server baseboard management, industrial sensor hubs, modular power supply monitoring, and embedded test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PCA9543AD,118 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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in interface, power management, and embedded processing technologies.
The PCA9543AD,118 belongs to NXP's I²C-bus switch and multiplexer product line, engineered specifically for robust bus isolation, voltage domain bridging, and interrupt-aware peripheral management in resource-constrained embedded systems.
FAQ
What is the I²C slave address range supported by PCA9543AD,118?
The PCA9543AD,118 uses a fixed 7-bit base address of 0xE0 (hex) with hardware-selectable A0 and A1 pins, yielding four possible write addresses: 0xE0, 0xE2, 0xE4, and 0xE6. These correspond to 7-bit values 0x70–0x73. The PCA9543AD,118 does not support the alternate PCA9543B address map (0xF0–0xF6), as confirmed by ordering information and top-side marking "PCA9543A".
Does PCA9543AD,118 require external pull-up resistors on its I²C lines?
Yes, PCA9543AD,118 requires external pull-up resistors on all I²C lines - upstream (SCL, SDA), downstream (SC0, SD0, SC1, SD1), and interrupt outputs (INT, INT0, INT1 if used as inputs). The device contains no internal pull-ups; resistor values must be selected based on bus capacitance and speed requirements per I²C specification.
Can PCA9543AD,118 translate between 1.8 V and 5 V I²C buses simultaneously?
Yes, PCA9543AD,118 supports simultaneous 1.8 V ↔ 5 V translation: set VDD to 1.8 V to clamp downstream voltages at ~1.5 V (per Vo(sw) spec), then use 5 V pull-ups on upstream SCL/SDA and 1.8 V pull-ups on downstream SCx/SDx. This configuration enables bidirectional signaling without level-shifter ICs or discrete MOSFETs.
How does the RESET function recover a stuck I²C bus?
Asserting RESET LOW for ≥4 ns resets the internal I²C state machine and forces all channels to deselect, releasing SCL and SDA lines into high-impedance mode. This breaks bus contention caused by a downstream device holding SCL/SDA LOW, allowing the master to regain control after the reset pulse ends - a critical feature for unattended systems.
Is PCA9543AD,118 pin-compatible with PCA9543APW,118?
No, PCA9543AD,118 (SO14/SOT108-1) and PCA9543APW,118 (TSSOP14/SOT402-1) share identical pin functions and electrical specifications but differ in physical package dimensions, lead pitch, and thermal resistance (127 °C/W vs 175 °C/W). PCB layout and reflow profiles must be adjusted for the respective package.
PCA9543AD,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- 2-Channel I2C Multiplexer
- Interface:
- I2C, SMBus
- Voltage - Supply:
- 2.3V ~ 5.5V
- Supplier Device Package:
- 14-SO
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
PCA9543AD,118 FAQ
1.How can I place an order for PCA9543AD,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9543AD,118 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 PCA9543AD,118 reliable?
The price and inventory of PCA9543AD,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9543AD,118 is usually 5 days.
3.What payment methods are accepted for PCA9543AD,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9543AD,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9543AD,118?
PCA9543AD,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9543AD,118 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 PCA9543AD,118?
For technical support, including PCA9543AD,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9543AD,118 requirements.
6.How does Aetrix verify that PCA9543AD,118 is sourced from the original manufacturer or authorized distributors?
All PCA9543AD,118 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 PCA9543AD,118 meets industry standards.
7.What is the process for return or replacement of PCA9543AD,118?
All PCA9543AD,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9543AD,118, 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 PCA9543AD,118 part is unused and in its original packaging.
Return procedure for PCA9543AD,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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