TCA9548ADGSR - 8-Channel 1.65-5.5V I2C Switch | TI
N.º de pieza: TCA9548ADGSR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0.69 | $0,69 |
| 10 | $0.64 | $6,40 |
| 100 | $0.58 | $58,00 |
| 500 | $0.53 | $265,00 |
| 1.000 | $0.49 | $490,00 |
TCA9548ADGSR Descripción general
An I2C switch (also called an I2C multiplexer or bus switch) is a signal-switching IC in the interface IC family that sits between a system controller and multiple I2C targets. In the hierarchy of I2C bus management devices, it sits alongside bus buffers, level translators, and I/O expanders, and its core job is to let a controller with one or two address pins reach many devices that would otherwise clash on identical addresses.
Key features of the TCA9548A include an active-low RESET input that recovers a hung downstream bus without cycling power, three address pins (A0, A1, A2) that allow up to eight TCA9548A devices on one I2C bus, and pass-gate switches with low ON resistance. Power-up deselect of all channels guarantees a glitch-free, deterministic bus state at startup, and the device is I2C Bus and SMBus compatible.
A major architectural advantage is built-in voltage translation: because the pass-gate switches are powered from VCC, the device allows 1.8V, 2.5V, 3.3V, and 5V bus domains to coexist across the same multiplexer, eliminating a separate level shifter in mixed-voltage systems. Hot insertion is also supported, so a downstream card can be connected without disturbing the upstream bus.
Typical applications include sensor hubs with multiple identical-address sensors, LCD and OLED display control via I2C, server backplanes and fans trays, and battery-management or power-supply modules where a controller must isolate and poll many buses. Selecting channels in any combination lets a controller scan multiple buses without repeated I2C re-addressing.
Design consideration: keep RESET asserted through a controller GPIO at power-up, and add a pull-up so the device does not float into an undefined state; channel selection is a single register write, so bus turnaround overhead is minimal.
This page synthesizes distributor pricing, drop-in alternative analysis, application guidance, and design notes beyond what the manufacturer datasheet alone provides.
Alternativas directas para TCA9548ADGSR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
TCA9548ADGSRQ1
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TCA9548ADGSR Valores máximos y características eléctricas
| Función | 8-channel I2C/SMBus switch with reset and voltage translation |
| Bus Type | I2C Bus and SMBus compatible |
| Supply Voltage Range | 1.65 V to 5.5 V |
| Number of Channels | 8 downstream channels (1-to-8 bidirectional switches) |
| Address Pins | 3 (A0, A1, A2) - up to 8 devices per I2C bus |
| Reset Input | Active-low RESET |
| Voltage Translation | 1.8 V, 2.5 V, 3.3 V, and 5 V bus domains |
| Power-Up State | All switch channels deselected, no glitch on power up |
| Hot Insertion | Supported |
| Rango de temperatura de funcionamiento | -40C to +85C |
| Encapsulado | VSSOP (DGS), 24 pins |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| Estado del ciclo de vida | Active (in production) |
Configuración de pines de TCA9548ADGSR
| Pin 1 | A0 — Address input 0 |
| Pin 2 | A1 — Address input 1 |
| Pin 3 | A2 — Address input 2 |
| Pin 4 | RESET — Active-low reset input |
| Pin 5 | GND — Ground |
| Pin 6 | VCC — Supply voltage, 1.65V to 5.5V |
| Pin 7 | SC0 — Serial clock, channel 0 |
| Pin 8 | SD0 — Serial data, channel 0 |
| Pin 9 | SC1 — Serial clock, channel 1 |
| Pin 10 | SD1 — Serial data, channel 1 |
| Pin 11 | SC2 — Serial clock, channel 2 |
| Pin 12 | SD2 — Serial data, channel 2 |
| Pin 13 | SC3 — Serial clock, channel 3 |
| Pin 14 | SD3 — Serial data, channel 3 |
| Pin 15 | SC4 — Serial clock, channel 4 |
| Pin 16 | SD4 — Serial data, channel 4 |
| Pin 17 | SC5 — Serial clock, channel 5 |
| Pin 18 | SD5 — Serial data, channel 5 |
| Pin 19 | SC6 — Serial clock, channel 6 |
| Pin 20 | SD6 — Serial data, channel 6 |
| Pin 21 | SC7 — Serial clock, channel 7 |
| Pin 22 | SD7 — Serial data, channel 7 |
| Pin 23 | SCL — Serial clock, upstream I2C bus |
| Pin 24 | SDA — Serial data, upstream I2C bus |
Aplicaciones típicas
TCA9548ADGSR es adecuado para 6 aplicacións: Sensor Hub with Identical-Address Sensors, Server and Backplane Bus Management, Display and Panel Control, Battery Management Systems, Industrial Automation and PLC I/O, Networking and Telecom Line Cards.
Sensor Hub with Identical-Address Sensors
Many popular I2C sensors ship with a single fixed address, so a hub that must connect several of them to one controller needs an address-conflict solution. The TCA9548ADGSR solves this by giving the controller a 1-to-8 switch: each identical-address sensor is placed on its own downstream channel, and the controller selects one channel at a time with a single register write. Operating from 1.65V to 5.5V, the device also translates between a 3.3V controller and 1.8V sensors without extra level shifters. Low ON-resistance pass gates preserve I2C rise/fall timing, and the active-low RESET allows quick recovery if one sensor locks the bus.
Recomendado
Server and Backplane Bus Management
In servers, blade systems, and rack backplanes, a baseboard controller typically polls dozens of FRU EEPROMs, hot-swap controllers, and fan trays, many of which share default I2C addresses. The TCA9548ADGSR segments these buses into eight independently switchable channels; channels can be selected in any combination, letting software scan buses without re-addressing. Hot-insertion support means a card can be plugged into a live backplane without glitching the upstream bus, and the power-on reset guarantees all channels start deselected. The active-low RESET tied to a supervisor GPIO lets the BMC recover a hung downstream bus after a time-out without cycling system power.
Recomendado
Display and Panel Control
LCD and OLED display modules commonly expose an I2C control interface, and multi-panel products - automotive clusters, stacked tiles, retail signage - often use identical controller addresses per panel. The TCA9548ADGSR multiplexes the host I2C bus to up to eight panel interfaces, selecting any combination of channels during initialization. Its 1.65V to 5.5V supply lets the switch sit between a 1.8V host and 3.3V panel rails with built-in voltage translation, avoiding discrete FET level shifters. Because the pass gates are glitch-free at power-up, panels do not see spurious writes during system sequencing, which protects configuration registers set once at boot.
Recomendado
Battery Management Systems
A battery pack with multiple cell-monitoring AFEs frequently stacks identical-address devices that cannot all sit on one bus. The TCA9548ADGSR partitions the pack into eight addressable segments, letting the pack controller read each monitoring device through its dedicated channel. The 1.65V to 5.5V operating range and voltage translation allow communication between a 5V controller domain and 3.3V AFE domain directly. Channel deselect at power-up keeps unused cell segments isolated during precharge and fault checks, and the RESET pin provides a fast recovery path if a cell board latches the bus during a fault, improving overall pack availability and safety diagnostics.
Recomendado
Industrial Automation and PLC I/O
Industrial controllers aggregate many I2C peripherals - ADCs, port expanders, and sensors - across a -40C to +85C ambient range typical of control cabinets. The TCA9548ADGSR is rated for that full range, and its 8 channels let a PLC main board address eight rail modules or daughter cards without address jumpers. The three address pins further allow up to eight multiplexers per bus, scaling to 64 segments. Selecting channels in any combination supports simultaneous polling of independent module buses, while the low-RON switches maintain signal integrity with heavier bus capacitance typical of shielded industrial wiring.
Recomendado
Networking and Telecom Line Cards
Optical modules, PMBus power supplies, and EEPROM inventory devices on telecom line cards often repeat default I2C addresses. The TCA9548ADGSR lets the card management controller isolate each module slot on its own bus segment, so a removed or failed module cannot stall the management bus. Hot-insertion support is specifically valuable here: a pluggable module can be inserted into a live channel without glitching other traffic. The active-low RESET enables time-out-driven recovery from a wedged module, a standard requirement in carrier-grade designs, and VSSOP-24 saves board area relative to TSSOP on dense line-card layouts.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para TCA9548ADGSR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | TCA9548ADGSRQ1 | TCA9548APWR | PCA9548AD |
|---|---|---|---|---|
| Package | VSSOP-24 (DGS) | VSSOP-24 (DGS) - same | TSSOP-24 (PW) | TSSOP-24 (SOT361) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors |
| Number of Channels | 8 | 8 | 8 | 8 |
| Supply Voltage Range | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 2.3 V to 5.5 V |
| Reset Input | Active-low RESET | Active-low RESET | Active-low RESET | Active-low RESET |
| Address Pins (max devices/bus) | 3 (8 devices) | 3 (8 devices) | 3 (8 devices) | 3 (8 devices) |
| Automotive Grade (AEC-Q100) | No | Yes (Q1 variant) | No | No |
| Operating Temperature | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C |
| Drop-in on VSSOP-24 footprint | - | Yes | No (new land pattern) | No (new land pattern) |
Diferenciadores clave
- Wider supply range than NXP equivalent (frente a PCA9548AD)
- Automotive-qualified drop-in available (frente a TCA9548APWR)
- Smaller footprint than TSSOP (frente a TCA9548APWR)
- Honest trade-off: package scarcity of true drop-ins (frente a TCA9548ADGSRQ1)
Notas de diseño
Tie the RESET pin to a controller GPIO with a pull-up resistor; do not leave it floating or hard-wired low, or the TCA9548ADGSR will hold all channels deselected permanently. Because the device powers up with all channels deselected by design, verify that your firmware performs a channel-select register write before the first access to any downstream device - an unexpected NACK on the first sensor read after boot is usually this missing channel-selection step, not a wiring fault.
Each selected downstream channel adds the multiplexer pass-gate resistance and its capacitance to the total bus. Estimate: with multiple TCA9548A levels or long traces, total bus capacitance can approach the I2C 400 pF limit, stretching rise times. Keep downstream traces short, size pull-up resistors (typically 2.2k to 4.7k ohm at 3.3V) to meet rise-time limits, and place the TCA9548A close to the connector on hot-swap designs. This is derived arithmetic and general I2C practice, not a datasheet figure.
Decouple VCC (pin 6) with a 0.1uF ceramic capacitor placed within a few millimeters of the pin, per standard TI interface IC layout practice. The VCC rail biases the pass gates and therefore sets the downstream bus logic levels - routing VCC from a noisy supply directly couples noise into all downstream buses. Estimated: at sub-milliamp ICC levels this is not a thermal concern, but supply ripple can appear as bus jitter on sensitive 1.8V channels.
The VSSOP-24 (DGS) package has a small 0.5mm lead pitch; confirm your fab supports the land pattern in the TI datasheet mechanical section before release. Address pins A0-A2 should be strapped to GND or VCC with resistors (not hard shorted) so address changes remain possible during bring-up, and keep them stable before power-up since floating address pins produce nondeterministic device addresses on the shared bus.
Información de cumplimiento
RoHS compliance and lead-free status per standard TI VSSOP product offerings; formal REACH, halogen-free, and conflict-minerals declarations for TCA9548ADGSR should be requested via TI's material declaration pages. The TCA9548ADGSRQ1 variant (not this P/N) is the AEC-Q100 qualified option.
