LTC4311 Linear Technology Integrated Circuit (Small Outline Packages) In Stock
The LTC4311 is an I2C/SMBus accelerator from Linear Technology in a 6-pin SC-70 package, operating from 1.6 V to 5.5 V, that boosts bus line rise times to enable high-speed multi-device I2C networks.
- Manufacturer
- Linear Technology
- Package
- Small Outline Packages
- Pin Count
- 6
- Lifecycle
- ACTIVE
- Datasheet
- LTC4311 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Wide 1.6 V to 5.5 V supply range supports mixed-voltage I2C/SMBus designs including 1.8 V, 3.3 V, and 5 V logic domains
- Active bus current drive reduces I2C/SMBus line rise times to support longer traces and higher bus capacitance loads
- Compatible with 100 kHz Standard-mode, 400 kHz Fast-mode, and 1 MHz Fast-mode Plus I2C/SMBus protocols
- Ultra-compact 6-pin SC-70 package minimizes PCB footprint for wearable, IoT, and space-constrained embedded designs
Applications
The LTC4311 is well suited for I2C/SMBus networks in IoT gateways, industrial sensor arrays, and medical monitoring equipment where high bus capacitance from multiple devices or long PCB traces degrades signal rise times. Operating from 1.6 V to 5.5 V, it restores reliable 400 kHz Fast-mode and 1 MHz Fast-mode Plus I2C operation without requiring PCB re-routing or reduced device count. The 6-pin SC-70 package minimizes board area, making it ideal for compact wearables and densely populated embedded system modules.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What supply voltage range does the LTC4311 operate from, and how does it speed up I2C bus signal transitions?
The LTC4311 operates across a 1.6 V to 5.5 V supply range and actively injects current into the I2C/SMBus SDA and SCL lines to reduce signal rise times. By providing stronger pull-up drive, it allows the bus to support higher capacitance loads—up to several hundred picofarads—while maintaining valid timing margins for 400 kHz Fast-mode and 1 MHz Fast-mode Plus I2C communication in multi-device systems.
Which embedded designs benefit most from adding an LTC4311 when bus capacitance exceeds 100 pF on an I2C network?
IoT gateway PCBs, industrial sensor hubs, and medical monitoring platforms with many I2C slaves, long routing traces, or multiple connectors often accumulate over 100 pF of bus capacitance, causing rise-time violations at 400 kHz. The LTC4311 corrects this by driving SCL and SDA lines more aggressively on a 1.6 V to 5.5 V supply, restoring fast transitions and eliminating the need for PCB redesign or reduced device count.
How does the SC-70 package of the LTC4311 compare in board area to SOT-23 I2C buffer alternatives for compact PCB designs?
The LTC4311's 6-pin SC-70 package occupies approximately 2.0 mm × 2.1 mm of PCB area, making it up to 30% smaller than equivalent SOT-23 packaged I2C accelerators and ideal for wearable devices, compact IoT modules, and any space-constrained embedded design. Despite its miniature footprint, it fully supports the 1.6 V to 5.5 V supply range and all standard I2C speeds up to 1 MHz Fast-mode Plus.
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