TCA4311ADR - 2.7-5.5V I2C/SMBus Buffer | Texas Instruments
部品番号: TCA4311ADR ✓ 生産中TCA4311ADR 概要
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.
ドロップイン代替品: TCA4311ADR — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: TCA4311ADR （同一形状・フットプリント） — 相違点: Package, Product Type.
TCA4311A
✅ ドロップイン📋 参考代替品（カタログ未掲載）
TCA4311D
✅ ドロップイン価格はお問い合わせください
データシートを見る →PCA9511ADP
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTC4301
✅ ドロップイン📋 参考代替品（カタログ未掲載）
TCA4311ADR 仕様
| 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 |
| 動作温度範囲 | -40 °C to +85 °C |
| パッケージ | 8-pin SOIC (D) |
| 実装タイプ | Surface mount |
| Shipping Form | Tape and reel |
TCA4311ADR 8-pin soic (d) ピン配置ガイド
TCA4311ADR (8-pin soic (d) パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: TCA4311ADR.
詳細は データシート をご参照ください。
主な用途
TCA4311ADR の用途: 6 件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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
エンジニアリング参考データ: TCA4311ADR — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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 |
主な差別化要因
- Manufacturer-defined hot-swap and precharge behavior （vs PCA9511ADP)
- Direct family continuity within Texas Instruments （vs LTC4301)
- Exact A-revision ordering identity （vs TCA4311D)
設計ノート
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.
コンプライアンス情報
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.