Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Channels | 2 bidirectional channels |
| Direction | Automatic / no DIR pin |
| Voltage Domains | Supports translation among ~0.95 V through 5 V common logic domains |
| Speed | Up to 100 MHz up-translation / >100 MHz down under light-capacitance stated conditions |
| Interfaces | Open-drain and push-pull applications including I²C/SMBus/GPIO/MDIO/SDIO |
| Enable | High-impedance I/O when EN is low |
| I/O | 5-V-tolerant translation-side capability |
| Exact Package / Packing | VSSOP (DCU), 8 pins; 3000-piece large reel; −40°C to +125°C |
Product Overview
LSF0102DCUR is a passive-style auto-bidirectional translator that avoids a direction pin. It is particularly useful on bidirectional buses and control signals whose direction changes dynamically, such as I²C or MDIO.
Speed depends strongly on pull-ups, edge direction and capacitive load. TI’s headline >100-MHz conditions are not a guarantee for a heavily loaded bus; at 50 pF the stated practical translation rate is much lower.
Because the device does not regenerate every edge like a buffered directional translator, external pull-up design and source drive remain part of signal-integrity performance.
For related devices, see HKEQGOO’s Translators, Level Shifters category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | LSF0102DCUR |
| Channels | 2 bidirectional channels |
| Direction | Automatic / no DIR pin |
| Voltage Domains | Supports translation among ~0.95 V through 5 V common logic domains |
| Speed | Up to 100 MHz up-translation / >100 MHz down under light-capacitance stated conditions |
| Interfaces | Open-drain and push-pull applications including I²C/SMBus/GPIO/MDIO/SDIO |
| Enable | High-impedance I/O when EN is low |
| I/O | 5-V-tolerant translation-side capability |
| Exact Package / Packing | VSSOP (DCU), 8 pins; 3000-piece large reel; −40°C to +125°C |
| Manufacturer Status | Active / Production |
| Part Marking | See TI addendum for exact DCU marking variants |
Functional Highlights
No DIR pin simplifies truly bidirectional signals
A line can change direction without firmware or glue logic switching a direction control.
Low RON preserves open-drain bus behavior
The translator behaves like a controlled pass path rather than forcing a new push-pull logic state on I²C/SMBus signals.
Design Considerations
- Choose pull-ups from bus capacitance and target rise time, not only DC current.
- Do not quote 100 MHz for a 50-pF bus; use load-specific timing.
- Verify voltage-domain ordering and bias conditions from the LSF application circuit.
Product Status and Exact Order Code
Texas Instruments/source evidence identifies LSF0102DCUR as Active / Production; VSSOP (DCU), 8 pins; 3000-piece large tape and reel; −40°C to +125°C.
For the same two-channel automatic bidirectional level-translation function in a thin SOT-23-8 package rather than this VSSOP-8 DCU version, compare LSF0102DDFR. The DDF and DCU variants use different PCB land patterns; confirm layout and assembly constraints rather than assuming mechanical interchangeability.
Related Engineering Resources
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