Specifications
| Type | Description |
|---|---|
| Part Number | TCA9546 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | TSSOP-16, body size 5.00 mm x 4.40 mm; SOIC-16, body size 9.90 mm x 3.91 mm |
| Number of Channels | 4; bidirectional translating switch channels |
| Interface Compatibility | I2C bus and SMBus compatible; device operation |
| Address Pins | 3; A0, A1, A2 allow up to eight TCA9546A devices on the I2C bus |
| Channel Selection | Any individual channel or combination of channels; determined by programmable control register over I2C |
| Power-Up State | All switch channels deselected; after power-up or internal power-on reset |
| Reset Input | Active-low RESET; pulling RESET low resets I2C state machine and deselects all channels |
| Operating Supply Voltage | 1.65 to 5.5 V; recommended operating conditions |
| Input Voltage Tolerance | 5.5 V tolerant inputs; all I/O pins |
| Supported Bus Voltages | 1.8 V, 2.5 V, 3.3 V, 5 V; voltage-level translation between buses using external pull-up resistors |
| I2C Clock Frequency | 0 to 400 kHz; standard-mode and fast-mode I2C bus timing |
| Operating Free-Air Temperature | -40 to 85 °C; recommended operating conditions |
| Supply Voltage Absolute Maximum | -0.5 to 7 V; absolute maximum ratings |
| Input Voltage Absolute Maximum | -0.5 to 7 V; absolute maximum ratings |
| Input Current Absolute Maximum | ±20 mA; absolute maximum ratings |
| Output Current Absolute Maximum | ±25 mA; absolute maximum ratings |
| Continuous Current Through VCC | ±100 mA; absolute maximum ratings |
| Continuous Current Through GND | ±100 mA; absolute maximum ratings |
| Total Power Dissipation | 400 mW; absolute maximum ratings |
| Storage Temperature | -65 to 150 °C; absolute maximum ratings |
| HBM ESD Rating | ±4000 V; human-body model per ANSI/ESDA/JEDEC JS-001 |
| CDM ESD Rating | ±1500 V; charged-device model per JEDEC JESD22-C101 |
| SCL/SDA High-Level Input Voltage | 0.7 x VCC min, 6 V max; recommended operating conditions |
| A2-A0 and RESET High-Level Input Voltage | 0.7 x VCC min, VCC + 0.5 V max; recommended operating conditions |
| SCL/SDA Low-Level Input Voltage | -0.5 V min, 0.3 x VCC max; recommended operating conditions |
| A2-A0 and RESET Low-Level Input Voltage | -0.5 V min, 0.3 x VCC max; recommended operating conditions |
| Power-On Reset Rising Voltage | 1.2 V min, 1.5 V max; VCC rising, VI = VCC or GND, no load |
| Power-On Reset Falling Voltage | 0.8 V min, 1 V max; VCC falling, VI = VCC or GND, no load |
| Switch Output Voltage | 2.6 V min, 4.5 V typ; VCC = 4.5 to 5.5 V, VSWin = VCC, ISWout = -100 uA |
| Switch Output Voltage | 1.6 V min, 2.8 V typ; VCC = 3.0 to 3.6 V, VSWin = VCC, ISWout = -100 uA |
| Switch Output Voltage | 1.0 V min, 1.8 V typ; VCC = 2.3 to 2.7 V, VSWin = VCC, ISWout = -100 uA |
| Switch Output Voltage | 0.5 V min, 1.1 V typ; VCC = 1.65 to 1.95 V, VSWin = VCC, ISWout = -100 uA |
| SDA Low-Level Output Current | 3 mA min, 7 mA max; VCC = 1.65 to 5.5 V, VOL = 0.4 V |
| SDA Low-Level Output Current | 6 mA min, 10 mA max; VCC = 1.65 to 5.5 V, VOL = 0.6 V |
| Input Leakage Current | ±1 uA; SCL, SDA, SC3-SC0, SD3-SD0, A2-A0, RESET; VI = VCC or GND; VCC = 1.65 to 5.5 V |
| Operating Supply Current | 50 uA max; VCC = 5.5 V, VI = VCC or GND, fSCL = 400 kHz, IO = 0, tr max = 300 ns |
| Operating Supply Current | 35 uA max; VCC = 5.5 V, VI = VCC or GND, fSCL = 100 kHz, IO = 0, tr max = 1 us |
| Standby Supply Current | 1.6 uA typ, 2 uA max; VCC = 5.5 V, low inputs or high inputs, IO = 0 |
| Supply Current Change | 2 uA typ, 15 uA max; SCL or SDA input at 0.6 V or VCC - 0.6 V, other inputs at VCC or GND, VCC = 1.65 to 5.5 V |
| Address Input Capacitance | 4.5 pF typ, 6 pF max; A2-A0, VI = VCC or GND, VCC = 1.65 to 5.5 V |
| RESET Input Capacitance | 4.5 pF typ, 5.5 pF max; RESET, VI = VCC or GND, VCC = 1.65 to 5.5 V |
| SCL/SDA Off Capacitance | 15 pF typ, 19 pF max; switch off, VI = VCC or GND, VCC = 1.65 to 5.5 V |
| SCn/SDn Off Capacitance | 6 pF typ, 8 pF max; SC3-SC0 and SD3-SD0, switch off, VCC = 1.65 to 5.5 V |
| Switch On-State Resistance | 4 ohm min, 10 ohm typ, 16 ohm max; VCC = 4.5 to 5.5 V, VO = 0.4 V, IO = 15 mA |
| Switch On-State Resistance | 5 ohm min, 13 ohm typ, 20 ohm max; VCC = 3.0 to 3.6 V, VO = 0.4 V, IO = 15 mA |
| Switch On-State Resistance | 7 ohm min, 16 ohm typ, 45 ohm max; VCC = 2.3 to 2.7 V, VO = 0.4 V, IO = 10 mA |
| Switch On-State Resistance | 10 ohm min, 25 ohm typ, 70 ohm max; VCC = 1.65 to 1.95 V, VO = 0.4 V, IO = 10 mA |
| I2C Clock Frequency | 0 to 100 kHz; standard-mode I2C bus |
| I2C Clock Frequency | 0 to 400 kHz; fast-mode I2C bus |
| I2C Bus Capacitive Load | 400 pF max; standard-mode and fast-mode I2C bus |
| Propagation Delay Time | 0.3 ns max; SDA or SCL to SDn or SCn, RON = 20 ohm, CL = 15 pF |
| Propagation Delay Time | 1 ns max; SDA or SCL to SDn or SCn, RON = 20 ohm, CL = 50 pF |
| Datasheet Status | request_only |
Product Overview
The TCA9546 is a Texas Instruments 4-channel I2C SMBus switch in the Signal_Chain category. It provides four bidirectional translating switch channels compatible with I2C bus and SMBus operation. A programmable control register over I2C selects any individual channel or any combination of channels, while three address pins, A0, A1, and A2, allow up to eight devices on the same I2C bus.
The device operates from a recommended supply voltage of 1.65 to 5.5 V and supports bus voltage translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses using external pull-up resistors. Standard-mode operation is specified from 0 to 100 kHz, and fast-mode operation is specified from 0 to 400 kHz with a 400 pF maximum I2C bus capacitive load.
After power-up or internal power-on reset, all switch channels are deselected. Pulling the active-low RESET input low resets the I2C state machine and deselects all channels. Package options include TSSOP-16 with a 5.00 mm x 4.40 mm body and SOIC-16 with a 9.90 mm x 3.91 mm body.
Key Features
- Four bidirectional translating I2C and SMBus switch channels
- Any individual or combined channel selection through I2C register
- Three address pins support up to eight bus devices
- All switch channels deselected after power-up reset
- Active-low RESET clears state machine and deselects channels
- 1.65 to 5.5 V recommended operating supply range
- Supports 1.8 V, 2.5 V, 3.3 V, and 5 V buses
- Fast-mode I2C operation specified up to 400 kHz
- 400 pF maximum I2C bus capacitive load
- -40 to 85 °C operating free-air temperature
Typical Applications
- I2C bus channel expansion
- SMBus channel switching
- Multi-voltage I2C bus translation
- I2C address conflict management
- Segmented sensor bus routing
- Processor peripheral bus isolation
- Multiple downstream I2C branches
Procurement Notes
When requesting a quote for TCA9546, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
How many switch channels does the TCA9546 provide?
The TCA9546 provides four bidirectional translating switch channels. Channel selection is programmed over the I2C bus, and any individual channel or combination of channels can be selected through the control register.
What supply voltage range is specified for TCA9546 operation?
The recommended operating supply voltage range is 1.65 to 5.5 V. The device supports voltage-level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses when external pull-up resistors are used.
What happens to the channels after power-up or reset?
After power-up or internal power-on reset, all switch channels are deselected. Pulling the active-low RESET input low resets the I2C state machine and also deselects all switch channels.
What I2C clock frequencies are supported by the TCA9546?
The TCA9546 supports standard-mode I2C operation from 0 to 100 kHz and fast-mode I2C operation from 0 to 400 kHz. The specified maximum I2C bus capacitive load is 400 pF.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.