Specifications
| Type | Description |
|---|---|
| Part Number | TCA4311 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | SOIC-8 4.90 mm x 3.91 mm; VSSOP/MSOP-8 3.00 mm x 3.00 mm |
| Supply Voltage Range | 2.7 to 5.5 V |
| Absolute Maximum Supply Voltage | -0.5 to 7 V |
| Absolute Maximum I2C Bus Voltage | -0.3 to 7 V, SDAIN, SCLIN, SDAOUT, SCLOUT |
| Absolute Maximum EN Input Voltage | -0.3 to 7 V |
| Input Clamp Current | -50 mA, VI < 0 |
| Output Clamp Current | -50 mA, VO < 0 |
| Continuous Output Current | ±50 mA |
| Continuous Current Through VCC or GND | ±100 mA |
| Package Thermal Impedance, D Package | 97 °C/W, JESD51-7 |
| Package Thermal Impedance, DGK Package | 172 °C/W, JESD51-7 |
| Storage Temperature Range | -65 to 150 °C |
| ESD Rating, Human Body Model | 8000 V, ANSI/ESDA/JEDEC JS-001, all pins |
| ESD Rating, Charged Device Model | 1000 V, JESD22-C101, all pins |
| High-Level Input Voltage, SDA and SCL | 0.7 x VCC to 5.5 V |
| High-Level Input Voltage, EN | 2 to 5.5 V |
| Low-Level Input Voltage, SDA and SCL | -0.5 to 0.3 x VCC V |
| Low-Level Input Voltage, EN | -0.5 to 0.8 V |
| Low-Level Output Current at VCC = 3 V | 3 mA |
| Low-Level Output Current at VCC = 4.5 V | 3 mA |
| Operating Free-Air Temperature | -40 to 85 °C |
| Supply Current | 5.1 typ, 7 max mA, VCC = 5.5 V, VSDAIN = VSCLIN = 0 V |
| Shutdown Supply Current | 0.1 µA, EN = 0 V |
| Precharge Voltage | 0.8 min, 1 typ, 1.2 max V, SDA and SCL floating |
| Bus Idle Time | 50 min, 95 typ, 150 max µs |
| EN Threshold Voltage | 0.5 x VCC min, 0.9 x VCC max V |
| Disable Threshold Voltage | 0.1 x VCC min, 0.5 x VCC max V |
| EN Input Current | ±0.1 typ, ±1 max µA, EN from 0 V to VCC |
| Enable Time | 95 µs |
| Disable Time | 30 ns, EN to READY |
| SDAIN to READY Delay After STOP | 1.2 µs |
| SCLOUT/SDAOUT to READY Delay | 0.8 µs |
| READY Off-State Leakage Current | ±0.1 µA |
| READY Output Low Voltage | 0.4 V, IPULLUP = 3 mA |
| Transient Boosted Pull-Up Current | 1 min, 2 typ mA, positive transition on SDA/SCL, VCC = 2.7 V |
| Input-Output Offset Voltage | 0 min, 100 typ, 175 max mV, 10 kΩ to VCC on SDA/SCL, VCC = 3.3 V |
| Digital Input Capacitance | 10 pF |
| Output Low Voltage | 0 to 0.4 V, SDA/SCL pins, input = 0 V, ISINK = 3 mA |
| Input Leakage Current | ±5 µA, SDA/SCL pins = VCC = 5.5 V |
| Supported Bus Modes | Standard Mode and Fast Mode I2C; SMBus devices |
| READY Output Type | Open drain |
| I2C Pin Type | Open-drain, powered-off high-impedance |
| Datasheet Status | request_only |
Product Overview
The TCA4311 is a Texas Instruments hot-swappable I2C bus buffer in the Signal_Chain category. It supports Standard Mode and Fast Mode I2C operation as well as SMBus devices, with open-drain SDA and SCL pins that remain high impedance when powered off. The READY output is open drain and indicates the connection state for bus insertion control.
Key Features
- 2.7 to 5.5 V recommended supply range
- Standard Mode and Fast Mode I2C support
- SMBus device support from device description
- Open-drain SDA and SCL pin structure
- Powered-off high-impedance I2C pin behavior
- Open-drain READY connection flag output
- 0.1 µA shutdown supply current with EN low
- 95 µs enable time from start-up circuitry
- 30 ns disable time from EN to READY
- 0.8 to 1.2 V SDA and SCL precharge
- ±5 µA SDA and SCL input leakage
- -40 to 85 °C operating free-air range
Typical Applications
- Hot-swappable I2C bus segments
- Standard Mode I2C connections
- Fast Mode I2C connections
- SMBus device connections
- READY-monitored bus insertion
- Powered-off high-impedance I2C segments
- Open-drain READY flag interfaces
Procurement Notes
When requesting a quote for TCA4311, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What supply range does the TCA4311 support?
The TCA4311 has a recommended operating supply voltage range of 2.7 to 5.5 V. Its absolute maximum supply voltage rating is -0.5 to 7 V over the operating free-air temperature range.
Which bus modes are supported by TCA4311?
The datasheet facts identify support for Standard Mode and Fast Mode I2C, along with SMBus devices. The SDA and SCL pins are open drain and specified as powered-off high impedance.
What packages are listed for this device?
The listed package options are SOIC-8 measuring 4.90 mm x 3.91 mm and VSSOP/MSOP-8 measuring 3.00 mm x 3.00 mm.
How is the READY output specified?
READY is specified as an open-drain connection flag output. The READY output low voltage is 0.4 V with IPULLUP = 3 mA, and READY off-state leakage current is ±0.1 µA.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 12, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.