TCA4311ADR - 2.7-5.5V I2C/SMBus Buffer | Texas Instruments
MPN： TCA4311ADR ✓ 啟用中TCA4311ADR 概覽
An I2C buffer, also called a bus buffer or bus repeater, is an interface IC placed between two bus segments. It reproduces the SDA and SCL signals in both directions so that bus capacitance, voltage-level differences, and long interconnect sections can be managed more effectively. In the broader hierarchy, the TCA4311ADR belongs to the I2C interface-controller, bus-buffer, interface-IC, and semiconductor categories.
The principal features include bidirectional operation on both SDA and SCL, a 2.7 V to 5.5 V operating-power-supply range, and support for I2C/SMBus signaling at up to 400 kHz. Hot-swappable operation addresses systems in which a peripheral may be connected or disconnected while the bus remains active. The 1 V precharge feature helps limit signal corruption during those live insertion and removal events.
The TCA4311ADR contains separate buffered paths for SDA and SCL, allowing two-wire bus segments to be isolated with respect to signal propagation and bus loading. Its 8-pin SOIC package is intended for surface-mount assembly. Because the device operates bidirectionally, the SDA and SCL connections must remain correctly terminated and must not introduce additional pull-up paths that exceed the design limits of the bus.
Typical uses include hot-pluggable I2C peripherals, bus-isolation and level-translation interfaces, removable sensor modules, card-edge connections, and systems where one bus segment must connect to another without directly loading the entire bus. The 400 kHz operating limit also makes the device appropriate for standard fast-mode I2C equipment, including sensors, EEPROMs, and low-to-medium-rate control peripherals.
Designers should account for the hot-swap path, external pull-up resistors, bus capacitance, and the voltage applied to each side of the buffer. Verify signal rise times at the intended bus frequency and ensure that powered-off or disconnected modules cannot back-power either bus segment. The manufacturer pin-description table should be used when assigning tracks and checking pull-up placement.
This page combines the manufacturer product information, exact ordering information, supported operating limits, and cross-reference findings into a design-focused overview. It also identifies the limits of available replacement data so engineers can distinguish confirmed package and family options from candidates that still require independent pin-level and timing validation.
直接替換替代品，適用於 TCA4311ADR — 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： TCA4311ADR （相同外形與佔位） — 差異在於 Package, Product Type.
TCA4311A
✅ 直接替換📋 參考替代品（不在目錄中）
TCA4311D
✅ 直接替換聯絡詢價
查看資料表 →PCA9511ADP
✅ 直接替換📋 參考替代品（不在目錄中）
LTC4301
✅ 直接替換📋 參考替代品（不在目錄中）
TCA4311ADR 規格
| Product Type | Hot-swappable 2-wire bus buffer |
| Operating Power-Supply Voltage Range | 2.7 V to 5.5 V |
| Maximum I2C/SMBus Frequency | 400 kHz |
| Channel Count | 1 channel |
| Buffered Signal Count | 2 bits |
| Bidirectional Data Transfer | Supported on SDA and SCL |
| Hot-Swappable Operation | Supported |
| Precharge Voltage | 1 V on SDA and SCL |
| Supported Bus | I2C/SMBus |
| Logic Voltage | 3.3 V or 5 V |
| 工作溫度範圍 | -40 °C to +85 °C |
| 封裝 | 8-pin SOIC (D) |
| 安裝類型 | Surface mount |
| Shipping Form | Tape and reel |
TCA4311ADR 8-pin soic (d) 腳位配置指南
TCA4311ADR（8-pin soic (d) 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： TCA4311ADR.
請參閱 資料表 以查看完整腳位配置。
典型應用
TCA4311ADR 適用於 6 應用s: Hot-Pluggable Sensor Interfaces, Removable Communication Modules, Isolated I2C Bus Sections, Card-Edge and Backplane Connections, EEPROM and Configuration Buses, Precision Measurement and Control.
Hot-Pluggable Sensor Interfaces
The TCA4311ADR fits hot-pluggable sensor interfaces because it buffers SDA and SCL bidirectionally and applies 1 V precharge to both lines during live connections. Its 400 kHz operating limit supports standard fast-mode I2C sensors while the 2.7 V to 5.5 V supply range accommodates common 3.3 V and 5 V systems. Place the buffer between the system bus and a removable sensor module, then verify that the module cannot back-power the host bus during insertion, removal, or power loss.
推薦
Removable Communication Modules
Use the TCA4311ADR when a removable communication module must connect to an active I2C or SMBus segment. The device provides two buffered, bidirectional signal paths and supports operation to 400 kHz, allowing the module interface to remain compatible with standard fast-mode bus devices. Its 1 V SDA and SCL precharge helps control the connection sequence, while the 8-pin SOIC package simplifies routing in compact embedded equipment. Validate signal rise time and pull-up placement for the longest permitted cable or PCB interconnect.
推薦
Isolated I2C Bus Sections
The TCA4311ADR can divide one I2C system into buffered bus sections, reducing the load presented by downstream devices to the upstream controller. Both SDA and SCL are regenerated in opposite directions, so the two sections can operate as standard bus nodes. With a 400 kHz ceiling and 2.7 V to 5.5 V supply range, the device suits industrial and embedded control boards. Ensure that pull-up resistors belong to the intended voltage domain and that each bus section remains within supported capacitance and timing limits.
推薦
Card-Edge and Backplane Connections
TCA4311ADR is appropriate for card-edge or backplane connections where an add-in module may be attached to an operating bus. The hot-swappable architecture and 1 V precharge on SDA and SCL help reduce the chance of corrupted command or control traffic during insertion. Its two bidirectional channels support the complete two-wire interface, and the 400 kHz limit fits many configuration, monitoring, and peripheral-control buses. Check connector sequencing and ensure that unpowered cards include suitable isolation to prevent accidental back-powering.
推薦
EEPROM and Configuration Buses
The TCA4311ADR can buffer SDA and SCL connections to EEPROMs and other configuration peripherals that share an I2C bus. Bidirectional buffering preserves controller-to-peripheral commands and peripheral-to-controller acknowledgments, while operation to 400 kHz supports fast-mode devices. The 3.3 V or 5 V logic compatibility and 2.7 V to 5.5 V supply range make the interface suitable for mixed embedded and industrial systems. Verify that the additional buffer does not require excess pull-up capacitance or create timing-margin issues.
推薦
Precision Measurement and Control
Use the TCA4311ADR when a measurement or control peripheral communicates over a two-wire bus that also serves lower-speed circuitry. Its buffered SDA and SCL paths can divide the bus into manageable sections, while 400 kHz operation is sufficient for many sensor-control loops and register-oriented peripherals. The device does not improve measurement accuracy directly, but controlled bus impedance and defined precharge behavior can improve connection reliability. Confirm rise-time margin, pull-up values, and peripheral power states in the final topology.
推薦
工程參考資料，適用於 TCA4311ADR — 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 | TCA4311A | TCA4311D | PCA9511ADP | LTC4301 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors | Linear Technology |
| Package | 8-pin SOIC (D) | 8-pin SOIC (D) - same package family | 8-pin SOIC (D) - same package family | 8-pin SOIC (D) - same package family | 8-pin SOIC (D) - same package family |
| Product Type | Hot-swappable 2-wire bus buffer | TCA4311A-family hot-swappable I2C/SMBus buffer | TCA4311-family two-wire bus buffer | Two-wire bus buffer | Hot-swappable two-wire bus buffer |
| Buffered Lines | 2-bit bidirectional SDA and SCL | 2-bit bidirectional SDA and SCL | Two-wire bus buffer | Two-wire bus buffer | Two-wire bus buffer |
主要差異化特點
- Manufacturer-defined hot-swap and precharge behavior (對比PCA9511ADP)
- Direct family continuity within Texas Instruments (對比LTC4301)
- Exact A-revision ordering identity (對比TCA4311D)
設計說明
Route SDA and SCL as a matched, short pair and place the TCA4311ADR close to the connector or removable-module interface. Keep the host-bus and peripheral-side pull-up resistors on their respective sides of the buffer. The device is intended for hot-swappable operation, but correct sequencing still depends on connector design, peripheral power-state behavior, and the voltage applied to the bus pins.
Check the complete system as two connected bus segments rather than sizing the buffer in isolation. Use the 400 kHz operating limit as the upper bus-rate design point, then verify rise time, propagation delay, capacitance, and pull-up values with the longest expected interconnect. The 1 V precharge characteristic controls the connection sequence but does not replace proper pull-up placement or back-power prevention.
Do not treat any candidate as a drop-in replacement solely because it uses an 8-pin SOIC package. Before substituting TCA4311D, PCA9511ADP, or LTC4301, compare the numbered pinout, supply range, precharge voltage, hot-plug timing, logic thresholds, propagation delay, and bus-capacitance limits. Also ensure that a disconnected or unpowered module cannot source current into either buffered bus segment.
Provide a low-impedance ground reference and decouple the device close to its supply pins according to the manufacturer application guidance. Avoid placing long stubs on either side of the buffer because stubs add capacitance and can degrade the transition edges used by I2C. Maintain a compact layout around the connector, pull-up networks, and TCA4311ADR to preserve signal-integrity and hot-plug behavior.
合規資訊
The available manufacturer product information does not state the requested compliance statuses, so each field remains unknown. The -40 °C to +85 °C operating range is a temperature specification, not evidence of AEC-Q100 qualification.