Specifications
| Type | Description |
|---|---|
| Part Number | TCA9548A |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | PW (TSSOP-24) 7.80 mm x 4.40 mm; RGE (VQFN-24) 4.00 mm x 4.00 mm; DGS (VSSOP-24) 6.10 mm x 3.00 mm |
| Switch Configuration | 1-to-8 bidirectional translating switches; upstream SCL/SDA pair fans out to eight downstream SCn/SDn channels |
| Interface Compatibility | I2C Bus and SMBus compatible for device control and switching interface |
| Channel Selection | Any individual channel or combination of channels selectable by programmable control register through I2C bus |
| Address Pins | 3 address pins; allows up to eight TCA9548A devices on the I2C bus |
| Power-Up State | All switch channels deselected after power-on reset |
| Reset Input | Active-low RESET; asserting RESET initializes I2C/SMBus state machine and deselects all channels |
| Operating Supply Voltage | 1.65 V to 5.5 V at -40 C <= TA <= 85 C |
| Operating Supply Voltage | 1.65 V to 3.6 V at 85 C < TA <= 125 C |
| Operating Free-Air Temperature | -40 C to 85 C at 3.6 V < VCC <= 5.5 V |
| Operating Free-Air Temperature | -40 C to 125 C at 1.65 V <= VCC <= 3.6 V |
| 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 |
| I2C Clock Frequency | 0 kHz to 400 kHz; feature list |
| I2C Standard-Mode Clock Frequency | 0 kHz to 100 kHz; I2C interface timing requirements, standard mode |
| Voltage Translation Support | 1.8 V, 2.5 V, 3.3 V, and 5 V buses; external pull-up resistors set desired voltage level per channel |
| Input Tolerance | 5 V tolerant inputs; all I/O pins are 5 V tolerant |
| Power-On Reset Voltage Rising | 1.2 V typ, 1.5 V max; no load, VI = VCC or GND |
| Power-On Reset Voltage Falling | 0.8 V typ, 1 V max; no load, VI = VCC or GND |
| Switch Output Voltage | 2.6 V min, 4.5 V max; VCC = 4.5 V to 5.5 V, VI(sw) = VCC, ISWout = -100 uA |
| Switch Output Voltage | 1.6 V min, 2.8 V max; VCC = 3 V to 3.6 V, VI(sw) = VCC, ISWout = -100 uA |
| Switch Output Voltage | 1.1 V min, 2 V max; VCC = 2.3 V to 2.7 V, VI(sw) = VCC, ISWout = -100 uA |
| Switch Output Voltage | 0.6 V min, 1.25 V max; VCC = 1.65 V to 1.95 V, VI(sw) = VCC, ISWout = -100 uA |
| SDA Low-Level Output Current | 3 mA min, 6 mA max; VOL = 0.4 V, VCC = 1.65 V to 5.5 V |
| SDA Low-Level Output Current | 6 mA min, 9 mA max; VOL = 0.6 V, VCC = 1.65 V to 5.5 V |
| Input Leakage Current | -1 uA min, 1 uA max; SCL, SDA, SC7-SC0, SD7-SD0, A2-A0, RESET; VI = VCC or GND; VCC = 1.65 V to 5.5 V |
| Operating Supply Current | 50 uA typ, 80 uA max; VCC = 5.5 V, fSCL = 400 kHz, VI = VCC or GND, IO = 0 |
| Operating Supply Current | 20 uA typ, 35 uA max; VCC = 3.6 V, fSCL = 400 kHz, VI = VCC or GND, IO = 0 |
| Operating Supply Current | 6 uA typ, 10 uA max; VCC = 1.65 V, fSCL = 400 kHz, VI = VCC or GND, IO = 0 |
| Standby Supply Current | 0.2 uA typ, 2 uA max; VCC = 5.5 V, low or high inputs, IO = 0, -40 C <= TA <= 85 C |
| Standby Supply Current | 0.1 uA typ, 2 uA max; VCC = 3.6 V, low or high inputs, IO = 0, -40 C <= TA <= 85 C |
| Switch-On Resistance | 4 ohm min, 10 ohm typ, 20 ohm max; VCC = 4.5 V to 5.5 V, VO = 0.4 V, IO = 15 mA |
| Switch-On Resistance | 5 ohm min, 12 ohm typ, 30 ohm max; VCC = 3 V to 3.6 V, VO = 0.4 V, IO = 15 mA |
| Switch-On Resistance | 7 ohm min, 15 ohm typ, 45 ohm max; VCC = 2.3 V to 2.7 V, VO = 0.4 V, IO = 10 mA |
| Switch-On Resistance | 10 ohm min, 25 ohm typ, 70 ohm max; VCC = 1.65 V to 1.95 V, VO = 0.4 V, IO = 10 mA |
| HBM ESD Rating | +/-2000 V; human body model per ANSI/ESDA/JEDEC JS-001 |
| CDM ESD Rating | +/-1000 V; charged-device model per JEDEC JESD22-C101 |
| Absolute Maximum Supply Voltage | -0.5 V to 7 V over operating free-air temperature range |
| Absolute Maximum Input Voltage | -0.5 V to 7 V; input negative-voltage and output voltage ratings may be exceeded if current ratings are observed |
| Storage Temperature | -65 C to 150 C; absolute maximum ratings |
| Datasheet Status | request_only |
Product Overview
The TCA9548A is a Texas Instruments Signal_Chain device configured as an 8-channel I2C switch. Its upstream SCL/SDA pair fans out through 1-to-8 bidirectional translating switches to eight downstream SCn/SDn channels. Channel selection is controlled by a programmable register over the I2C bus, and any individual channel or combination of channels can be selected.
The device supports I2C Bus and SMBus compatible control. Three address pins allow up to eight TCA9548A devices on the same I2C bus. After power-on reset, all switch channels are deselected, and the active-low RESET input initializes the I2C/SMBus state machine while also deselecting all channels.
Operating supply range is 1.65 V to 5.5 V for -40 C to 85 C operation, and 1.65 V to 3.6 V for operation above 85 C to 125 C. External pull-up resistors set channel voltage levels for 1.8 V, 2.5 V, 3.3 V, and 5 V buses. Package options include TSSOP-24, VQFN-24, and VSSOP-24 footprints for board-level integration.
Key Features
- 1-to-8 bidirectional translating switch configuration
- I2C Bus and SMBus compatible control interface
- Any individual or combined channel selection
- Three address pins support up to eight devices
- All switch channels deselected after power-on reset
- Active-low RESET deselects channels and initializes state machine
- 1.65 V to 5.5 V supply operation at -40 C to 85 C
- 0 kHz to 400 kHz I2C clock frequency
- Supports 1.8 V, 2.5 V, 3.3 V, and 5 V buses
- All I/O pins are 5 V tolerant
Typical Applications
- I2C bus channel expansion
- SMBus channel switching
- Multi-voltage I2C bus routing
- Address-conflict device isolation
- Sensor bus fanout
- Board-level I2C segmentation
- Reset-controlled bus recovery
Procurement Notes
When requesting a quote for TCA9548A, 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
What type of device is the TCA9548A?
The TCA9548A is an 8-channel I2C switch from Texas Instruments. It uses 1-to-8 bidirectional translating switches to fan an upstream SCL/SDA pair out to eight downstream SCn/SDn channels.
How are TCA9548A channels selected?
Any individual channel or combination of channels can be selected through a programmable control register on the I2C bus. After power-on reset, all switch channels are deselected.
What supply voltage range does TCA9548A support?
For -40 C to 85 C operation, the operating supply voltage range is 1.65 V to 5.5 V. For operation above 85 C to 125 C, the supply range is 1.65 V to 3.6 V.
Can TCA9548A support different I2C bus voltage levels?
Yes. The device supports 1.8 V, 2.5 V, 3.3 V, and 5 V buses, with external pull-up resistors setting the desired voltage level for each channel.
What package options are listed for TCA9548A?
Listed package options are PW TSSOP-24 at 7.80 mm x 4.40 mm, RGE VQFN-24 at 4.00 mm x 4.00 mm, and DGS VSSOP-24 at 6.10 mm x 3.00 mm.
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.