TCA9511A Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The TCA9511A is a 3.3V I2C bus buffer from Texas Instruments in an 8-pin VSSOP package for bidirectional signal buffering. Supports Hot-Swap capability and bus capacitance buffering to extend I2C bus length and isolate bus segments. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- TCA9511A Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Bidirectional I2C bus buffer at 3.3V supply enabling segment isolation and capacitance extension for longer I2C bus runs
- Hot-Swap capability allowing live board insertion without disrupting ongoing I2C communications in active backplane systems
- Compact 8-pin VSSOP package supporting I2C standard mode (100kHz) and fast mode (400kHz) for flexible embedded system integration
Applications
The TCA9511A is used in multi-board systems and server backplanes where I2C bus segments must be isolated and extended beyond standard capacitance limits without disrupting communication. It is commonly deployed in hot-swap applications in computing and telecommunications equipment where daughter boards are inserted and removed while the system remains powered. The device also serves in sensor networks and industrial control systems requiring reliable I2C connectivity across distributed PCB assemblies.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for TCA9511A:
Frequently Asked Questions
What is the TCA9511A and what problem does it solve?
The TCA9511A is a bidirectional I2C bus buffer operating at 3.3V supply. It solves the I2C bus capacitance limitation problem by buffering and isolating bus segments, allowing the total bus capacitance to exceed the standard 400pF limit. This enables longer I2C bus runs and more devices on the bus while maintaining signal integrity and timing compliance with the I2C specification.
Does the TCA9511A support hot-swap applications?
Yes, the TCA9511A supports Hot-Swap capability, allowing boards to be inserted into or removed from a live backplane without corrupting ongoing I2C transactions on other bus segments. This feature is critical in high-availability systems such as servers, network switches, and telecom equipment where continuous operation is required and field-replaceable units must be hot-swapped during normal system operation.
What I2C speeds does the TCA9511A support and what package is it available in?
The TCA9511A supports standard mode I2C operation at 100kHz and fast mode at 400kHz, covering the most common I2C communication speeds used in embedded systems. The device is housed in an 8-pin VSSOP (Very Small Small Outline Package) surface-mount package, which provides a compact footprint suitable for high-density PCB designs in space-constrained applications such as server blades and portable instruments.
How does the TCA9511A extend I2C bus distance compared to unbuffered designs?
By acting as a capacitance buffer between two I2C bus segments, the TCA9511A allows each segment to have up to 400pF capacitance independently, effectively doubling or further extending the total bus capacitance budget compared to a single unbuffered bus. This enables longer PCB traces, more slave devices per segment, and connection over cables or between boards in larger systems while maintaining compliant I2C signal rise and fall times.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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