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Analog Devices LTC4309IDE#PBF — DC-DC Power Modules

LTC4309IDE#PBF I2C Buffer Accelerator, Hot-Swap, 400 kHz

MPNLTC4309IDE#PBF
End of Life

Analog Devices LTC4309IDE#PBF, I2C Buffer and Accelerator, 2-Wire Bus Input/Output, 400 kHz Data Rate, 2.3V-5.5V Supply, 2 Channels, 12-WFDFN Exposed Pad Package, -40°C to 85°C, Tube.

$7.81Ref. price · indicative, final on quote
Packaging12-WFDFN Exposed Pad
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LTC4309IDE#PBF specifications
ParameterValue
TypeBuffer, Accelerator
MountingSurface Mount
Voltage2.3V ~ 5.5V
Current - supply7mA
Operating temperature-40°C ~ 85°C
Input2-Wire Bus
Output2-Wire Bus
PackageTube
ApplicationsI2C - Hotswap
Case12-WFDFN Exposed Pad
Data rate400kHz
Channels2
Capacitance - input10 pF

Product details

I2C bus buffer with hot-swap — what it does on the board

It sits between a live backplane and a plug-in card, isolating bus capacitance and preventing data corruption during insertion or removal. The part operates from a 2.3 V to 5.5 V supply, drawing 7 mA typical, and supports standard I2C data rates up to 400 kHz (Fast Mode). Its 10 pF input capacitance keeps the bus load light on the upstream controller side.

Hot-swap sequencing and bus isolation

The device detects a valid bus voltage on its supply pin before connecting the upstream and downstream bus segments. This prevents glitches and stuck buses when a card is plugged into a live system.

Package and board layout notes

Frequently asked questions

Does LTC4309IDE#PBF support hot-swap of I2C devices?

Yes, the LTC4309 is specifically designed for I2C hot-swap applications. It prevents data corruption and bus stalls when cards are inserted into or removed from a live backplane.

What is the maximum data rate supported by LTC4309IDE#PBF?

The maximum data rate is 400 kHz, which corresponds to standard I2C Fast Mode. It does not support Fast Mode Plus (1 MHz) or high-speed mode.

When sourcing LTC4309IDE#PBF, what's the closest functional sibling?

The LTC4308IDD#PBF is the closest same-function sibling — same 400 kHz data rate, 2.3 V supply minimum, two channels, and I2C hot-swap application. The main difference is the package: LTC4308IDD#PBF comes in a 10-DFN versus the 12-DFN of the LTC4309. Verify PCB footprint compatibility before substituting.