LTC4307IMS8#PBF

LTC4307IMS8#PBF is Linear Technology’s dual I2C-bus level-shifting switch in an 8‑pin MSOP package. The IMS8 suffix denotes the 8‑lead MSOP/DFN package, and #PBF means Pb‑free.
What it does:
- Provides two bidirectional I2C ports with independent supply rails, enabling level translation between different I2C voltage domains.
- Allows safe bus isolation during power-down and while devices are unpowered, helping prevent back-powering and leakage.
- Compatible with standard I2C/SMBus signaling; uses simple pull-ups on each side.
Key features (highlights):
- Dual, bidirectional I2C buses with level shifting between VCC1 and VCC2 domains.
- Power-down isolation to protect devices during sequencing.
- Suitable for mixed-voltage I2C designs and hot-swap/power-sequencing applications.
Typical applications:
- Microcontroller hosts interfacing with low-voltage peripherals.
- Mixed-voltage I2C systems (e.g., 1.8V and 3.3V devices).
- I2C bus isolation for power-up/power-down scenarios.
For exact pinout, electrical specs, and example schematics, refer to the LTC4307 datasheet.

Equivalent parts (I2C level shifting/bus protection similar to LTC4307IMS8#PBF):
- NXP PCA9306: dual bidirectional I2C level shifter (1.2–5.5 V)
- NXP PCA9517A: I2C bus repeater/level shifter
- TI TXS0102 / TXS0108E: bidirectional voltage-level translators (I2C-compatible)
- TI TCA9517A: I2C bus repeater
Note: exact pinout and features (hot-swap, current limit) vary; check datasheets for drop-in compatibility.

LTC4307IMS8#PBF is a single-channel hot‑swap controller with I2C-friendly control. Key features:
- Single high-side switch with programmable current limit and soft-start to control inrush.
- Overcurrent/short-circuit protection with latch and fault indication.
- Reverse-current protection to prevent backfeeding.
- Overvoltage/undervoltage protection for load safety.
- Fault/Power-Good/status outputs (open-drain) for host monitoring.
- I2C-compatible control interface to enable/disable and read status.
- Low quiescent current; operates from typical 2.7 V to 5.5 V supplies.
- Package: 8-pin MSOP (IMS8) Pb-Free (PBF).

- Pin count: 8 pins (MSOP-8, IMS8 package).
- Function: LTC4307 is an I2C/SMBus bus protector and level shifter that provides current-limited, bidirectional isolation between two I2C buses (host and device sides), with over/under-voltage protection for hot-swap scenarios.

Manufacturer: Analog Devices, Inc. (ADI). The LTC prefix traces to Linear Technology, which ADI acquired in 2017.
What kind of company: A global semiconductor company specializing in analog, mixed-signal, and digital signal processing ICs, including power management, data converters, amplifiers, and interface devices.

- Level shifting for I2C/SMBus between different voltage domains (eg, 3.3V MCU to 5V peripherals)
- I2C bus buffering and isolation in multi-supply systems, backplanes, or daughtercards
- Hot-swap and power‑sequencing protection to prevent back‑feeding during insertion or power-down
- I2C bus extension/bridge for remote sensors, PMBus devices, or multi‑board architectures
These make LTC4307 suitable for multi‑voltage I2C networks, safe power‑up/down behavior, and bus isolation in complex systems.

8-pin MSOP package (MSOP-8); Pb-free/RoHS-compliant as indicated by #PBF.