PCA9546APWTG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments PCA9546A is a 4-channel I2C and SMBus multiplexer with reset pin and 45 Ω on-state resistance in a 16-pin TSSOP package, enabling bus isolation of up to 4 I2C segments. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- PCA9546APWTG4 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
- 4 independent I2C/SMBus channels selectable via software address, enabling up to 4 buses with identical slave addresses to coexist without conflicts
- 60 dB off-state isolation and 45 Ω max on-state resistance maintaining signal integrity at 400 kHz fast-mode I2C across all channels
- Active-low RESET pin allows hardware recovery from bus lockup without power cycling the host system
Applications
PCA9546APWTG4 solves address-conflict problems in systems that aggregate multiple identical I2C sensors such as temperature monitors, EEPROMs, or display controllers on a single microcontroller bus. It is widely used in server DIMM slot management, multi-camera I2C configuration buses, and industrial I/O expansion boards where 4 independently switched I2C segments must be controlled from a single master with a 1.8 V to 5.5 V supply.
Specifications
| YTEOL | 0 |
| Analog IC - Other Type | SINGLE-ENDED MULTIPLEXER |
| JESD-30 Code | R-PDSO-G16 |
| Normal Position | NO/NC |
| Number of Channels | 4 |
| Number of Functions | 1 |
| Off-state Isolation-Nom | 60dB |
| 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 |
| Switching | BREAK-BEFORE-MAKE |
| Technology | CMOS |
| 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 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does PCA9546APWTG4 resolve I2C address conflicts when using 4 identical sensors on one bus?
The PCA9546A switches one of its 4 channel outputs active at a time using a control register written over the I2C bus. Each channel connects its upstream master to a separate downstream segment, so 4 sensors with the same fixed 7-bit address can coexist — the master activates channel 0, addresses sensor 0, deactivates, then activates channel 1 for sensor 1. Off-state isolation of 60 dB prevents leakage between inactive channels.
What on-state resistance does PCA9546APWTG4 introduce per channel, and how does it affect pull-up resistor sizing?
Maximum on-state resistance is 45 Ω per channel at 3.3 V. For a 400 kHz fast-mode I2C bus with a 4.7 kΩ pull-up resistor, the 45 Ω series resistance adds less than 1% to the total pull-up impedance, producing negligible timing degradation. However, for long buses over 1 meter, pull-up values should be reduced to 2.2 kΩ to compensate for the combined line and switch resistance.
What voltage levels does PCA9546APWTG4 support on its I2C lines for multi-voltage board designs?
The device operates from a 2.7 V to 5.5 V VCC supply and accepts SDA/SCL levels referenced to VCC, supporting 3.3 V and 5 V I2C bus voltages. When VCC is 3.3 V, the I2C thresholds are compatible with 1.8 V-to-3.3 V level translators upstream, making PCA9546A suitable for mixed-voltage systems where a 1.8 V microcontroller master must reach 3.3 V sensor slaves through 4 switched channels.
How does the RESET pin on PCA9546APWTG4 prevent system lockups in production designs?
Driving RESET low for at least 500 ns clears the channel register and disconnects all 4 outputs, releasing any bus-stuck condition caused by a sensor holding SDA low mid-transaction. In a production board, tying RESET to a GPIO allows a watchdog or supervisor firmware to recover a locked I2C bus in under 1 µs without a full system power cycle, improving uptime in always-on industrial and server applications.
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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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