Specifications
| Type | Description |
|---|---|
| Part Number | PCA9548A_I2C-Mux |
| Manufacturer | Texas Instruments |
| Product Type | I2C Switch |
| Category | Signal Chain |
| Inferred Category | Interface |
| Component Type | Other |
| Package / Case | SSOP-24 8.20 mm x 5.30 mm; TVSOP-24 5.00 mm x 4.40 mm; SOIC-24 15.40 mm x 7.50 mm; TSSOP-24 7.80 mm x 4.40 mm; VQFN-24 4.00 mm x 4.00 mm |
| Device Function | Low-voltage 8-channel I2C switch with reset |
| Channel Count | 8 downstream channel pairs |
| Switch Type | 1-of-8 bidirectional translating switches |
| Interface Compatibility | I2C bus and SMBus compatible |
| Clock Frequency Range | 0 kHz to 400 kHz |
| Operating Supply Voltage | 2.3 V to 5.5 V |
| Absolute Maximum Supply Voltage | -0.5 V to 7 V |
| Absolute Maximum Input Voltage | -0.5 V to 7 V |
| Absolute Maximum Input Current | -20 mA to 20 mA |
| Absolute Maximum Output Current | -25 mA to 25 mA |
| Absolute Maximum Supply Current | -100 mA to 100 mA |
| Storage Temperature | -65°C to 150°C |
| Operating Free-Air Temperature | -40°C to 85°C |
| SCL/SDA High-Level Input Voltage | 0.7 x VCC min, 6 V max |
| A2-A0 and RESET High-Level Input Voltage | 0.7 x VCC min, VCC + 0.5 V max |
| SCL/SDA Low-Level Input Voltage | -0.5 V min, 0.3 x VCC max |
| A2-A0 and RESET Low-Level Input Voltage | -0.5 V min, 0.3 x VCC max |
| Input Tolerance | 5-V tolerant inputs |
| Voltage Translation Support | Allows translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses |
| Power-Up State | All switch channels deselected |
| Reset Input | Active-low RESET |
| Hardware Address Pins | 3 pins: A0, A1, A2 |
| Maximum Devices on I2C Bus | Up to 8 PCA9548A devices |
| HBM ESD Rating | ±2000 V |
| CDM ESD Rating | ±1000 V |
| Latch-Up Performance | Exceeds 100 mA |
| Datasheet Status | request_only |
Product Overview
PCA9548A_I2C-Mux is a Texas Instruments Interface component for I2C and SMBus bus switching. The device function is a low-voltage 8-channel I2C switch with reset, implemented with eight downstream SCx/SDx channel pairs selected through a control register. Its switch architecture is described as 1-of-8 bidirectional translating switches under I2C bus control.
The recommended operating supply voltage is 2.3 V to 5.5 V, and the supported I2C/SCL clock frequency range is 0 kHz to 400 kHz. The device operates across -40°C to 85°C free-air temperature, with storage temperature rated from -65°C to 150°C. Inputs are 5-V tolerant, and external pull-up resistors with VCC pass-gate limiting allow translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses.
Package choices include SSOP-24, TVSOP-24, SOIC-24, TSSOP-24, and VQFN-24. Three hardware address pins, A0, A1, and A2, allow up to eight PCA9548A devices on one I2C bus. At power-up all switch channels are deselected, and the active-low RESET input initializes the device without powering down.
Key Features
- Low-voltage 8-channel I2C switch with reset
- Eight downstream SCx and SDx channel pairs
- 1-of-8 bidirectional translating switch architecture
- I2C bus and SMBus compatible interface
- 0 kHz to 400 kHz SCL clock range
- 2.3 V to 5.5 V recommended supply range
- 5-V tolerant inputs for mixed-voltage systems
- Translates between 1.8 V, 2.5 V, 3.3 V, and 5 V buses
- All switch channels deselected at power-up
- Active-low RESET initializes device without power-down
- Three hardware address pins support up to eight devices
- HBM ±2000 V and CDM ±1000 V ESD ratings
Typical Applications
- I2C bus channel selection
- SMBus channel selection
- Mixed-voltage I2C bus translation
- Multi-device I2C address expansion
- Resettable I2C bus switching
- Eight-channel downstream bus routing
- Systems using 1.8 V to 5 V buses
Procurement Notes
When requesting a quote for PCA9548A_I2C-Mux, 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 PCA9548A_I2C-Mux?
PCA9548A_I2C-Mux is a Texas Instruments Interface device described as a low-voltage 8-channel I2C switch with reset. It provides eight downstream channel pairs using 1-of-8 bidirectional translating switches.
What supply voltage range does this device support?
The recommended operating supply voltage is 2.3 V to 5.5 V. Absolute maximum supply voltage is listed as -0.5 V to 7 V under stress-rating conditions.
Can PCA9548A_I2C-Mux support mixed-voltage I2C buses?
Yes. The extracted datasheet facts state that it allows translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses when using external pull-up resistors and VCC pass-gate limiting.
How many PCA9548A devices can share one I2C bus?
Up to eight PCA9548A devices can be used on one I2C bus. This is enabled by the three hardware address pins A0, A1, and A2.
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.