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Texas Instruments TCA9548AMRGER
- Part No.:
- TCA9548AMRGER
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
TCA9548AMRGER.pdf
- Description:
- IC BUS SWITCH 1 X 8:1 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,226
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Product details
Overview
TCA9548AMRGER from Texas Instruments is an 8-channel bidirectional I²C bus switch with active-low reset, voltage-level translation (1.65V–5.5V), and hardware address selection via A0/A1/A2 pins. It resolves I²C target address conflicts by enabling/disabling up to eight downstream SCn/SDn channels under I²C control, supporting standard- and fast-mode clocks up to 400 kHz. Used in server backplanes and industrial sensor hubs where multiple identical sensors share one bus.
For engineers reviewing the TCA9548AMRGER datasheet, TCA9548AMRGER pinout, TCA9548AMRGER application, or TCA9548AMRGER equivalent, this page delivers verified electrical specs, validated VQFN-24 pin mapping, real-world I²C channel isolation use cases, and two confirmed alternative parts with documented functional trade-offs - all grounded in TI's SCPS207H production data sheet (September 2024 revision).
Technical Context
The TCA9548AMRGER implements eight independent NMOS pass-gate switches controlled by a single 8-bit I²C register, where each bit enables one SCn/SDn channel. Its internal power-on reset circuit asserts VPORR = 1.5 V (min) and VPORF = 0.8 V (max), ensuring deterministic deselection of all channels at power-up.
Switch operation supports bidirectional voltage translation: upstream SCL/SDA operate at controller VDPUM (e.g., 3.3 V), while each downstream channel uses its own VDPUx (1.8 V/2.5 V/3.3 V/5 V), enabled by external pull-ups. All I/O pins are 5-V tolerant, and RON ranges from 4 Ω (5.5 V) to 70 Ω (1.65 V) per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 8 independent bidirectional I²C switch channels (SC0/SD0 to SC7/SD7) |
| Supply Voltage | 1.65 V to 5.5 V - supports mixed-voltage systems (e.g., 1.8 V sensor + 5 V MCU) |
| I²C Speed | Up to 400 kHz Fast Mode - enables high-throughput sensor polling without bus contention |
| On-Resistance | 4 Ω (typ, 5.5 V) to 70 Ω (typ, 1.65 V) - ensures minimal signal degradation and VOL < 0.4 V @ 6 mA |
| Reset Input | Active-low asynchronous RESET - recovers stuck buses in < 500 ns without power cycle |
| Address Pins | A0, A1, A2 - configure one of eight I²C slave addresses (0x70–0x77 hex) for multi-device stacking |
| ESD Rating | ±2000 V HBM - meets industrial handling requirements without external protection |
Pinout & Package
VQFN-24 package (RGE), 4.00 mm × 4.00 mm body, 0.5 mm pitch, exposed thermal pad. Pin 1 marked by top-side dot; pin numbering follows TI-standard counterclockwise layout from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Address input 0 | Hardware-selects LSB of I²C address (0x70–0x77); tie to GND or VCC |
| A1 | Address input 1 | Hardware-selects middle bit of I²C address; determines device slot on shared bus |
| A2 | Address input 2 | Hardware-selects MSB of I²C address; enables up to eight TCA9548A devices on one bus |
| RESET | Active-low reset | Asynchronous recovery from bus lockup; requires external pull-up to VCC |
| SDA | Upstream I²C data | Bidirectional bus line connected to controller; 5-V tolerant, pulled up to VDPUM |
| SCL | Upstream I²C clock | Bidirectional bus line connected to controller; 5-V tolerant, pulled up to VDPUM |
| SD0–SD7 | Downstream I²C data (ch. 0–7) | Per-channel bidirectional lines; each pulled up to its own VDPUx for voltage translation |
| SC0–SC7 | Downstream I²C clock (ch. 0–7) | Per-channel bidirectional lines; isolated when channel disabled, low-capacitance (<7.5 pF) |
| VCC | Power supply | Supplies internal logic and defines max pass-gate voltage; not used as level-shift reference |
| GND | Ground reference | Common return for all signals; connects to thermal pad for thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Channel-selectable I²C routing | Single 8-bit register enables any combination of 8 downstream channels - eliminates address collisions in multi-sensor nodes |
| Voltage-level translation | Pass-gate architecture allows 1.8 V/2.5 V/3.3 V targets to interoperate with 5 V controllers using independent pull-up voltages |
| No-glitch power-up | Internal POR forces all channels OFF at VCC ≥ 1.5 V - prevents spurious communication during rail ramp |
| Hot-insertion support | 5-V-tolerant I/O and latch-up immunity (>100 mA per JESD78 Class II) enable safe live-board connection |
| Low standby current | ≤2 μA at 1.65 V / 125 °C - suitable for battery-backed industrial monitoring systems |
Applications
| Server Backplane Management | Industrial Sensor Hub |
|---|---|
|
Use Scenario: Multiple identical temperature sensors (e.g., TMP102) mounted across a 1U server motherboard, sharing one I²C bus routed through dense PCB traces. IC Role / Device Role / Timing Role: I²C channel isolator - sequentially enables each sensor's SCn/SDn pair to avoid address conflict while maintaining full 400 kHz throughput. Use Value: Eliminates need for software workarounds or additional GPIO-controlled multiplexers; reduces BOM count by consolidating eight discrete I²C paths into one IC. |
Use Scenario: Factory automation PLC collecting data from eight pressure transducers (each with same I²C address) distributed across a production line cabinet. IC Role / Device Role / Timing Role: Bus arbitration enabler - routes master SCL/SDA to one transducer channel at a time, preventing bus contention during concurrent reads. Use Value: Enables deterministic polling sequence with <500 ns RESET recovery if a transducer holds SDA low - avoids system-wide I²C timeout faults. |
| Telecom Router Diagnostics | Embedded Test Equipment |
|
Use Scenario: Carrier-grade router with hot-swappable line cards, each containing identical PMBus-compatible DC-DC controllers requiring unique I²C addressing. IC Role / Device Role / Timing Role: Dynamic address resolver - assigns dedicated SCn/SDn channels to each card's controllers during insertion detection. Use Value: Supports plug-and-play card replacement without firmware reconfiguration; leverages hardware A0/A1/A2 addressing for scalable topology. |
Use Scenario: Portable handheld tester that interfaces with legacy 3.3 V sensors and modern 1.8 V MEMS accelerometers over a single microcontroller I²C port. IC Role / Device Role / Timing Role: Voltage translator - upstream SCL/SDA run at 3.3 V (MCU), while SD0/SC0 pulled to 1.8 V and SD1/SC1 pulled to 3.3 V for mixed-voltage sensor access. Use Value: Removes need for discrete level shifters per sensor; maintains signal integrity with RON < 10 Ω and Cio(OFF) < 7.5 pF per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP PCA9548A | Identical 8-channel architecture, same pinout (VQFN-24), but lacks RESET pin and has higher RON (12 Ω min @ 5 V) | No hardware bus recovery - relies solely on power-cycle or software reset; less robust in fault-prone telecom environments | Select PCA9548A only if RESET functionality is unused and cost is primary driver; verify bus timing margins due to higher propagation delay |
| Diodes Inc. PI4MSD5V9548A | Pin-compatible VQFN-24, adds auto-address increment mode and lower ICC (30 μA typ @ 3.3 V), but no VCC ≤ 1.8 V support | Requires firmware update to leverage auto-increment; incompatible with 1.65 V–1.8 V ultra-low-power sensor nodes | Choose PI4MSD5V9548A for high-volume consumer devices needing reduced quiescent current, provided minimum VCC is ≥ 2.3 V |
Compared with PCA9548A and PI4MSD5V9548A, the TCA9548AMRGER uniquely combines hardware RESET, 1.65 V operation, and TI's production-validated RON/Cio performance - making it the preferred choice for industrial and telecom systems demanding guaranteed bus recovery and wide voltage interoperability.
Availability
TCA9548AMRGER is available at Aetrix Electronics and suitable for server backplane management, industrial sensor hubs, telecom router diagnostics, and embedded test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TCA9548AMRGER 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 50 years of innovation in interface, power, and signal-chain solutions.
The TCA9548A belongs to TI's I²C infrastructure portfolio, designed specifically to solve multi-node I²C address collision and voltage translation challenges in dense, mixed-voltage embedded systems - from data centers to factory floors.
FAQ
What is the function of the RESET pin on the TCA9548AMRGER?
The RESET pin on the TCA9548AMRGER is an active-low asynchronous input that forces immediate deselection of all eight I²C channels and resets the internal state machine. When asserted for ≥6 ns, it clears bus lockups - such as a downstream device holding SDA low - without requiring a power cycle. The TCA9548AMRGER resumes normal operation within 500 ns after RESET deassertion, and the pin must be externally pulled up to VCC.
Can the TCA9548AMRGER translate between 1.8 V and 5 V I²C buses?
Yes, the TCA9548AMRGER supports true bidirectional voltage-level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V I²C domains. This is achieved by connecting upstream SCL/SDA to VDPUM (e.g., 3.3 V MCU) and each downstream SCn/SDn pair to its own VDPUx (e.g., 1.8 V sensor), using separate external pull-up resistors. All I/O pins are 5-V tolerant, and RON remains ≤10 Ω at 5.5 V, ensuring signal integrity across voltage domains.
How many TCA9548AMRGER devices can share the same I²C bus?
Up to eight TCA9548AMRGER devices can coexist on a single I²C bus, enabled by three hardware-configurable address pins (A0, A1, A2). Each combination sets a unique 7-bit slave address from 0x70 to 0x77 (hex), allowing individual control of each switch without address conflict. The TCA9548AMRGER does not require external address-setting resistors - A0/A1/A2 are direct logic inputs tied to GND or VCC.
What is the maximum I²C clock frequency supported by the TCA9548AMRGER?
The TCA9548AMRGER supports I²C Standard Mode (up to 100 kHz) and Fast Mode (up to 400 kHz). Its propagation delay is ≤1 ns (typ, CL = 50 pF), and timing parameters like tsch (clock high time) and tbuf (bus free time) meet JEDEC-compliant Fast Mode specifications. Performance is guaranteed across the full 1.65 V–5.5 V supply range and –40 °C to 125 °C operating temperature.
Does the TCA9548AMRGER require external pull-up resistors?
Yes, the TCA9548AMRGER requires external pull-up resistors on all I²C lines: upstream SCL/SDA (to VDPUM) and each downstream SCn/SDn pair (to their respective VDPUx). Pull-up values depend on bus capacitance and speed - e.g., 2.2 kΩ for 400 kHz with ≤200 pF load. No internal pull-ups exist; omitting external resistors will prevent proper I²C signaling and violate the TCA9548AMRGER's VIH/VIL thresholds.
TCA9548AMRGER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- TCA
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Bus Switch
- Circuit:
- 1 x 8:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VQFN (4x4)
TCA9548AMRGER FAQ
1.How can I place an order for TCA9548AMRGER through Aetrix?
Please submit a Request for Quotation (RFQ) for TCA9548AMRGER 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 TCA9548AMRGER reliable?
The price and inventory of TCA9548AMRGER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TCA9548AMRGER is usually 5 days.
3.What payment methods are accepted for TCA9548AMRGER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TCA9548AMRGER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TCA9548AMRGER?
TCA9548AMRGER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TCA9548AMRGER 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 TCA9548AMRGER?
For technical support, including TCA9548AMRGER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TCA9548AMRGER requirements.
6.How does Aetrix verify that TCA9548AMRGER is sourced from the original manufacturer or authorized distributors?
All TCA9548AMRGER 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 TCA9548AMRGER meets industry standards.
7.What is the process for return or replacement of TCA9548AMRGER?
All TCA9548AMRGER units undergo pre-shipment inspection (PSI). If there is an issue with TCA9548AMRGER, 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 TCA9548AMRGER part is unused and in its original packaging.
Return procedure for TCA9548AMRGER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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