LTC1694-1CS5 Analog Devices Integrated Circuit (SOT23 (5-Pin)) In Stock
Analog Devices LTC1694-1CS5 is a single-channel I2C bus buffer in a 5-pin TSOT-23 package, operating from 3.3 V or 5 V supplies up to 6 V maximum. It isolates capacitive loads and extends I2C bus reach without address conflicts. Available in stock worldwide with fast international shipping.
- Manufacturer
- Analog Devices
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- OBSOLETE
- Datasheet
- LTC1694-1CS5 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?
- Single-channel I2C buffer supporting 3.3 V and 5 V supply rails up to 6 V maximum, enabling mixed-voltage I2C bus bridging
- Extends I2C bus capacitance limit beyond the 400 pF standard, allowing connection of additional slave devices or longer PCB traces
- Ultra-compact 5-pin TSOT-23 (SOT-23-5) package occupies less than 3 mm² of PCB area for space-constrained designs
- Transparent I2C pass-through operation preserves all address and protocol content without software reconfiguration
What is LTC1694-1CS5 used for?
The LTC1694-1CS5 is used in I2C systems where bus capacitance exceeds the 400 pF limit imposed by the I2C specification, such as backplane sensor trees with more than 8 slave devices connected on a single 3.3 V or 5 V bus. It is also used to bridge between a 5 V microcontroller I2C port and a 3.3 V sensor cluster, maintaining logic-level compatibility without a separate level translator. The tiny TSOT-23 package makes it practical in handheld medical instruments, industrial sensor nodes, and IoT gateway modules with tight PCB constraints.
What are the specifications of LTC1694-1CS5?
| YTEOL | 0 |
| Analog IC - Other Type | ANALOG CIRCUIT |
| JESD-30 Code | R-PDSO-G5 |
| JESD-609 Code | e0 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2.7V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| 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 datasheet?
LTC1694-1CS5 Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for LTC1694-1CS5?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What supply voltage range does the LTC1694-1CS5 support, and how does it enable 3.3 V and 5 V I2C bridging?
The LTC1694-1CS5 operates from a supply voltage of 2.7 V to 6 V, covering both 3.3 V and 5 V I2C bus rails within a single device. By buffering the SDA and SCL lines, it allows a 5 V master to communicate with 3.3 V slave devices without voltage spikes exceeding the lower-voltage rail's maximum input rating of 3.6 V, eliminating the need for a discrete level-shifter in mixed-voltage I2C trees.
By how much does the LTC1694-1CS5 extend the effective I2C bus capacitance, and which topologies benefit most?
The LTC1694-1CS5 isolates the upstream and downstream bus segments, allowing each side to present up to 400 pF of bus capacitance independently rather than sharing a single 400 pF budget. This effectively doubles the aggregate bus capacitance to 800 pF across the buffer, enabling longer PCB traces, more slave devices, or backplane configurations with trace lengths exceeding 300 mm at 100 kHz standard-mode I2C clock rates.
What package does the LTC1694-1CS5 use, and how does it fit on space-constrained boards?
The LTC1694-1CS5 comes in a 5-pin TSOT-23 package (JEDEC R-PDSO-G5) with a body measuring approximately 1.6 mm x 2.9 mm and a pin pitch of 0.95 mm. This footprint occupies under 5 mm² of PCB area, allowing placement between a microcontroller I2C header and a sensor cluster on boards where available routing space is less than 5 mm wide.
When is the LTC1694-1CS5 a more suitable solution than a GPIO-controlled I2C multiplexer?
A GPIO-controlled multiplexer requires firmware to manage channel switching and adds software latency of at least 1 µs per switch event at 400 kHz fast-mode I2C speeds. The LTC1694-1CS5 is transparent — no address configuration, no GPIO control lines, and no firmware changes — making it the better choice when bus segmentation is needed purely for capacitance relief or voltage bridging without altering the master's I2C transaction sequence.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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