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.
Related Engineering Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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