TCA9548APWR - 8-Channel I2C Switch with Reset | Texas Instruments
MPN： TCA9548APWR ✓ 啟用中TCA9548APWR 概覽
An I2C switch is a specialized multiplexer that enables a single I2C master to communicate with multiple slave devices that share the same address or operate at different voltage levels. By isolating downstream buses, it prevents address conflicts and allows voltage translation between the upstream and downstream segments. The TCA9548A belongs to the family of I2C bus switches and multiplexers, which are essential in complex systems where multiple sensors, EEPROMs, or other I2C peripherals need to be managed.
Key features include bidirectional translating switches, I2C and SMBus compatibility, active-low reset, three address pins, channel selection via I2C in any combination, power-up with all channels deselected, and low RON switches. The device supports a wide supply voltage range of 1.65V to 5.5V, making it suitable for mixed-voltage systems. The operating temperature range is -40°C to 85°C, and the package is a 24-pin TSSOP (PW) with a body size of 7.8mm x 4.4mm.
Technically, the TCA9548A uses a pass-gate architecture that provides bidirectional voltage translation. The VCC pin must be connected to the lowest voltage used on the bus to ensure proper level shifting. The device has a low quiescent current and supports standard and fast I2C modes. The reset input allows the switch to be reset to its default state (all channels deselected) without power cycling.
Typical applications include server and telecom systems for managing multiple I2C devices, industrial control for sensor arrays, and consumer electronics for connecting multiple peripherals. The TCA9548A is also used in automotive infotainment and ADAS systems where multiple I2C buses need to be isolated.
When designing with this device, ensure that the VCC pin is at the lowest voltage of any bus segment to guarantee correct voltage translation. Also, consider the capacitive loading on each channel and use appropriate pull-up resistors for the I2C bus.
直接替換替代品，適用於 TCA9548APWR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TCA9548APWR （相同外形與佔位） — 差異在於 Number of Channels, Address Pins, Function, I2C Clock Frequency, MSL Level.
PCA9548APWR
✅ 直接替換📋 參考替代品（不在目錄中）
PCA9548APW
✅ 直接替換聯絡詢價
查看資料表 →PCA9548APWRG4
✅ 直接替換📋 參考替代品（不在目錄中）
TCA9548APWR 最大額定值與電氣特性
| Type | Bus Switch 1 x 8:1 |
| Number of Channels | 8 |
| Supply Voltage Range | 1.65 V to 5.5 V |
| 介面 | I2C, SMBus |
| Reset Input | Active-low |
| Address Pins | 3 (A0, A1, A2) |
| 工作溫度範圍 | -40°C to 85°C |
| Package Type | TSSOP (PW) 24-pin |
| Package Body Size | 7.8 mm x 4.4 mm |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| MSL 等級 | 1 |
| ON-State Resistance (RON) | Low (typical 5 ohm) |
| I2C Clock Frequency | Up to 400 kHz (Fast mode) |
TCA9548APWR 腳位配置
| 腳位 1 | A0 — Address input 0 |
| 腳位 2 | A1 — Address input 1 |
| 腳位 3 | A2 — Address input 2 |
| 腳位 4 | RESET — Active-low reset input |
| 腳位 5 | SCL — Serial clock input (upstream) |
| 腳位 6 | SDA — Serial data input/output (upstream) |
| 腳位 7 | SC0 — Serial clock channel 0 |
| 腳位 8 | SD0 — Serial data channel 0 |
| 腳位 9 | SC1 — Serial clock channel 1 |
| 腳位 10 | SD1 — Serial data channel 1 |
| 腳位 11 | SC2 — Serial clock channel 2 |
| 腳位 12 | SD2 — Serial data channel 2 |
| 腳位 13 | GND — Ground |
| 腳位 14 | SD3 — Serial data channel 3 |
| 腳位 15 | SC3 — Serial clock channel 3 |
| 腳位 16 | SD4 — Serial data channel 4 |
| 腳位 17 | SC4 — Serial clock channel 4 |
| 腳位 18 | SD5 — Serial data channel 5 |
| 腳位 19 | SC5 — Serial clock channel 5 |
| 腳位 20 | SD6 — Serial data channel 6 |
| 腳位 21 | SC6 — Serial clock channel 6 |
| 腳位 22 | SD7 — Serial data channel 7 |
| 腳位 23 | SC7 — Serial clock channel 7 |
| 腳位 24 | VCC — Power supply (1.65V to 5.5V) |
典型應用
TCA9548APWR 適用於 6 應用s: Server and Telecom Systems, Industrial Control, Consumer Electronics, Automotive Infotainment, Medical Devices, IoT and Smart Home.
Server and Telecom Systems
In server and telecom systems, the TCA9548APWR manages multiple I2C devices such as EEPROMs, temperature sensors, and power management ICs. Its 8 channels allow isolation of different voltage domains, preventing address conflicts and enabling hot-swap of peripheral cards. The wide supply range (1.65V to 5.5V) supports mixed-voltage backplanes, and the reset input allows system-level recovery. With low RON and fast mode I2C, it maintains signal integrity over long traces.
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Industrial Control
The TCA9548APWR is used in industrial control systems to connect multiple sensors and actuators over I2C. Its 8 channels allow grouping of sensors by function or location, simplifying wiring and troubleshooting. The device's voltage translation capability enables mixing 3.3V and 5V sensors on the same bus. The -40°C to 85°C operating range suits harsh environments. The reset input provides a reliable way to reinitialize the bus without power cycling the entire system.
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Consumer Electronics
In consumer electronics like smart TVs and set-top boxes, the TCA9548APWR manages multiple I2C peripherals such as HDMI interface, audio codec, and tuner. Its 8 channels isolate these devices, preventing address conflicts and allowing independent power management. The low voltage operation (1.65V) is ideal for battery-powered devices. The small TSSOP-24 package saves board space, and the reset input allows quick recovery from bus hangs.
推薦
Automotive Infotainment
The TCA9548APWR is used in automotive infotainment systems to connect multiple I2C devices like display controllers, touch sensors, and audio DSPs. Its wide supply range (1.65V to 5.5V) accommodates different voltage domains in the car. The -40°C to 85°C range meets automotive temperature requirements. The reset input allows the system to recover from bus errors, and the 8 channels provide flexibility for future expansion. The device is AEC-Q100 qualified in some variants.
推薦
Medical Devices
In medical devices such as patient monitors and diagnostic equipment, the TCA9548APWR manages multiple I2C sensors and ADCs. Its 8 channels allow isolation of sensitive analog sections from digital noise. The low voltage operation (1.65V) is suitable for battery-powered portable devices. The reset input provides a reliable way to reinitialize the bus, and the wide temperature range ensures operation in clinical environments. The device's small package is ideal for space-constrained designs.
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IoT and Smart Home
The TCA9548APWR is used in IoT gateways and smart home hubs to connect multiple sensors and actuators over I2C. Its 8 channels allow grouping of devices by room or function, simplifying network management. The low power consumption and wide supply range (1.65V to 5.5V) are ideal for battery-powered nodes. The reset input allows remote recovery, and the small TSSOP-24 package is suitable for compact designs. The device supports fast mode I2C for high-throughput sensor data.
推薦
推薦產品摘要
工程參考資料，適用於 TCA9548APWR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PCA9548APWR | PCA9548APW | PCA9548ARGER |
|---|---|---|---|---|
| Package | TSSOP-24 (PW) | TSSOP-24 (PW) | TSSOP-24 (PW) | VQFN-24 (RGE) |
| Brand | Texas Instruments | Texas Instruments | NXP Semiconductors | Texas Instruments |
| Supply Voltage Range | 1.65V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V |
| Number of Channels | 8 | 8 | 8 | 8 |
| Reset Input | Yes (active-low) | Yes (active-low) | Yes (active-low) | Yes (active-low) |
| Address Pins | 3 (A0, A1, A2) | 3 (A0, A1, A2) | 3 (A0, A1, A2) | 3 (A0, A1, A2) |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | -40°C to 85°C | -40°C to 85°C |
| RoHS Compliant | Yes | Yes | Yes | Yes |
主要差異化特點
- Wider supply voltage range (1.65V to 5.5V) (對比PCA9548APW)
- Same package and pinout as PCA9548A (對比PCA9548APW)
- Active-low reset input (對比PCA9548APW)
設計說明
The TCA9548APWR operates from 1.65V to 5.5V. Ensure the VCC pin is connected to the lowest voltage on the I2C bus to enable proper voltage translation. For example, if the master is 3.3V and slaves are 5V, set VCC to 3.3V. Decouple VCC with a 0.1uF ceramic capacitor close to the pin.
Place pull-up resistors on each I2C channel (SCL/SDA) as required by the I2C specification. The value depends on bus capacitance and speed; typical values are 4.7k ohm for 100 kHz and 2.2k ohm for 400 kHz. Keep traces short and balanced to minimize skew.
Do not connect the TCA9548APWR to a bus with devices that have different voltage levels without proper translation. The VCC pin must be at the lowest voltage. Also, ensure the reset pin is pulled high or driven high during normal operation; a floating reset can cause unintended resets.
合規資訊
RoHS compliant per distributor data. REACH and conflict minerals status not specified in provided data.
