LTC1694-1CS5#PBF Linear Technology Integrated Circuit (SOT23 (5-Pin)) In Stock
Linear Technology LTC1694-1CS5#PBF is a single-channel I2C/SMBus accelerator IC in a 5-pin SOT-23 package that boosts bus rise times to support 400 kHz Fast Mode over longer cable runs. Operates from 2.7 V to 5.5 V supply with minimal quiescent current. Available from stock with worldwide shipping.
- Manufacturer
- Linear Technology
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- OBSOLETE
- Datasheet
- LTC1694-1CS5#PBF Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LTC1694-1CS5#PBF?
- I2C/SMBus bus accelerator enabling 400 kHz Fast Mode operation over extended cable lengths that would otherwise limit speed to below 100 kHz
- 2.7 V to 5.5 V supply range compatible with both 3.3 V and 5 V I2C bus systems without level translation
- Compact 5-pin SOT-23 package minimizing board space overhead for bus acceleration in densely populated mixed-signal PCBs
- Actively pulls up SCL and SDA lines to reduce rise time, eliminating the need for large external pull-up resistors on long I2C buses
What is LTC1694-1CS5#PBF used for?
The LTC1694-1CS5#PBF is designed to accelerate I2C and SMBus communication in systems where long PCB traces, cables, or high bus capacitance would otherwise limit data rates below 100 kHz Standard Mode. It actively drives the SCL and SDA lines to achieve the fast edge rates required for 400 kHz Fast Mode, making it suitable for industrial sensor networks, system management buses in servers, and multi-board embedded systems. The SOT-23-5 package makes it practical to add per-segment bus acceleration in backplane designs or cable-extended I2C trees without significant board area cost.
What are the specifications of LTC1694-1CS5#PBF?
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1635 |
| YTEOL | 0 |
| Analog IC - Other Type | ANALOG CIRCUIT |
| JESD-30 Code | R-PDSO-G5 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, LOW PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2.7V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | SOT23 (5-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.01 |
Where can I find the LTC1694-1CS5#PBF datasheet?
LTC1694-1CS5#PBF Datasheet DownloadOfficial datasheet from Linear Technology
What are equivalent replacements for LTC1694-1CS5#PBF?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the LTC1694-1CS5#PBF enable 400 kHz I2C Fast Mode over high-capacitance buses?
The LTC1694-1CS5#PBF actively drives the SCL and SDA lines with a controlled current source to shorten rise times below the 300 ns limit required for 400 kHz Fast Mode I2C operation. Without this acceleration, buses with more than 400 pF total capacitance would have rise times exceeding 1 µs, forcing the bus to operate at 100 kHz or slower Standard Mode.
What supply voltage range does the LTC1694-1CS5#PBF support for mixed 3.3 V and 5 V I2C systems?
The LTC1694-1CS5#PBF operates from a 2.7 V to 5.5 V supply, making it directly compatible with both 3.3 V and 5.0 V I2C bus environments. This wide supply range allows a single part to accelerate buses in 3.3 V microcontroller systems, 5 V industrial controllers, and mixed-voltage SMBus backplane applications without additional level-shifting components.
In which embedded system topologies is the LTC1694-1CS5#PBF most useful as an I2C bus extender?
The LTC1694-1CS5#PBF is most effective in multi-board backplane systems where I2C must traverse connectors and cables adding 100 pF to 1000 pF of parasitic capacitance per segment. It is also valuable in server management buses (SMBus) monitoring dozens of power modules, and in industrial sensor hubs where 8 to 32 sensor nodes are daisy-chained over distances exceeding 1 meter at 400 kHz.
How does LTC1694-1 differ from the standard LTC1694, and when should each be selected?
The LTC1694-1 variant has a higher current drive capability on the pull-up acceleration circuit compared to the base LTC1694, allowing it to overcome larger bus capacitances, typically above 400 pF, while maintaining 400 kHz Fast Mode timing. Designers should select LTC1694-1CS5#PBF when the total I2C bus capacitance exceeds 400 pF or cable length surpasses 1 meter, and use the standard LTC1694 only on lower-capacitance buses under 200 pF.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
Why Buy from FindMyChip
About Linear Technology
Linear Technology is a leading electronic component manufacturer. FindMyChip sources Linear Technology ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“The anti-counterfeit verification gave us confidence we'd never had with other China suppliers.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit