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Home > Products > Integrated Circuits (ICs) > Logic > Translators, Level Shifters

Texas Instruments LSF0101DTQR

Name: LSF0101DTQR
Brand: Texas Instruments
SKU: LSF0101DTQR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LSF0101DTQR

Manufacturer:: Texas Instruments

Category:: Translators, Level Shifters

Package:

Datasheet:: LSF0101DTQR.pdf

Description:: IC TRANSLTR BIDIRECTIONAL 6X2SON

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Inventory:8,745

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Product details

Overview

LSF0101DTQR from Texas Instruments is a 1-channel auto-bidirectional multi-voltage level translator IC designed for open-drain and push-pull interface bridging between mismatched voltage domains. It supports bidirectional translation across 0.95 V ↔ 1.8/2.5/3.3/5 V, 1.2 V ↔ 1.8/2.5/3.3/5 V, and other combinations; delivers ≤0.7 ns tPHL at 30 pF load; features flow-through pinout in X2SON-6 package; and operates from –40°C to 125°C - enabling use in I²C, SMBus, MDIO, and GPIO interconnects in telecom infrastructure.

For engineers reviewing the LSF0101DTQR datasheet, LSF0101DTQR pinout, LSF0101DTQR application, or LSF0101DTQR equivalent, key selection considerations include verified up/down translation speed vs. capacitive load (≤30 pF / ≤50 pF), EN pin biasing via 200 kΩ resistor to Vref_B, RON ≤10 Ω at 64 mA, 5-V-tolerant I/O compatibility with TTL, and thermal resistance (RθJA = 294.4°C/W) for compact industrial PCB layouts.

Technical Context

The LSF0101DTQR implements a passive MOSFET-based switch architecture-not buffered logic-enabling true auto-directional translation without DIR control. Its operation relies on internal pass transistors biased by Vref_A (A-side reference, 0.65–5.5 V) and Vref_B (B-side reference, Vref_A + 0.8 V min to 5.5 V), with EN tied directly to Vref_B through a 200 kΩ pull-up for functional enable.

Down translation (B→A) clamps A-side voltage to Vref_A when B is HIGH and enables low-impedance conduction when B is LOW; up translation (A→B) pulls B-side high via external pull-up while using the switch to sink current when A is LOW. Signal integrity depends critically on external pull-up sizing, layout parasitics, and Vref_B stability - not internal timing circuits or PLLs.

Key Specifications

Parameter	Value and Actual Design Meaning
Channels	1 independent bidirectional channel - supports single-signal isolation without shared bus arbitration logic.
Translation Speed	Up to 100 MHz down translation >100 MHz up translation at ≤30 pF; 40 MHz both directions at 50 pF - defines max usable data rate for I²C fast-mode plus or MDIO.
Voltage Range	Vref_A: 0.65–5.5 V; Vref_B: Vref_A+0.8 V to 5.5 V - enables flexible pairing like 1.8 V ↔ 3.3 V or 0.95 V ↔ 5 V without external level-shifting components.
R_ON	8.0 Ω typical (Vref_A=3.3 V, Vref_B=5 V, I_O=64 mA) - ensures minimal voltage drop and signal distortion during active sinking.
Standby Current	6 µA max (Vref_B=V_EN=5.5 V, Vref_A=4.5 V) - enables ultra-low-power operation in battery-backed or always-on systems.
ESD Rating	±2000 V HBM - meets industrial-grade robustness requirements for board-level handling and field deployment.
Operating Temp	–40°C to 125°C - qualified for automotive under-hood, industrial control, and telecom base station environments.

Pinout & Package

LSF0101DTQR uses the DTQ package: 6-pin X2SON (1.0 mm × 0.8 mm, 0.35 mm pitch), optimized for space-constrained routing with flow-through pin arrangement.

Pin/Terminal	Circuit Role	Design Meaning
GND	Ground reference	Common return path for all internal circuitry; must be low-inductance connection to system ground plane.
Vref_A	A-side reference supply	Defines maximum output voltage on A port; sets clamp level during down translation; range: 0.65–5.5 V.
A1	Channel 1 A-side I/O	Bidirectional data terminal for low-voltage domain (e.g., 1.8 V microcontroller GPIO); connects to pull-up if open-drain.
B1	Channel 1 B-side I/O	Bidirectional data terminal for high-voltage domain (e.g., 3.3 V sensor interface); requires external pull-up to VPU.
Vref_B	B-side reference supply	Defines B-side operating window; must exceed Vref_A by ≥0.8 V; connected via 200 kΩ to VCCB for EN biasing.
EN	Enable input	Tied directly to Vref_B; pulled LOW disables all I/Os into high-Z state - critical for power sequencing and hot-plug safety.

Key Features

Feature	Design Value
No direction pin required	Enables seamless bidirectional communication on shared buses (I²C/SMBus) without MCU GPIO overhead or timing-critical DIR control signals.
Flow-through pinout	Minimizes trace length and layer transitions - reduces parasitic capacitance and crosstalk in high-speed routing on dense 2-layer PCBs.
5-V-tolerant I/O	Allows direct interfacing with legacy 5-V TTL logic without external resistive dividers or protection diodes - simplifies mixed-voltage system design.
Low R_ON < 10 Ω	Maintains signal edge integrity and reduces VOL shift under load - essential for meeting I²C fast-mode plus (1 Mbps) VOL spec of ≤0.4 V.
Latch-up immunity >100 mA	Guarantees robust operation in noisy industrial environments with transient coupling or ESD events per JESD17 Class II.

Applications

I²C Bus Bridging	MDIO Interface Translation
Use Scenario: Connecting a 1.8-V FPGA I²C controller to a 3.3-V EEPROM or temperature sensor in telecom line cards. IC Role / Device Role / Timing Role: Auto-directional voltage translator enabling bidirectional SDA/SCL signaling without clock stretching or protocol modification. Use Value: Eliminates need for dual-supply buffers or discrete MOSFET solutions; maintains 400 kHz–1 MHz I²C timing compliance with <0.7 ns propagation delay.	Use Scenario: Interfacing a 2.5-V PHY management interface (MDIO) to a 1.2-V Ethernet MAC in enterprise switch ASIC designs. IC Role / Device Role / Timing Role: Level-shifting MDIO data and MDC clock between mismatched voltage domains while preserving open-drain drive capability. Use Value: Supports IEEE 802.3-compliant MDIO timing with ≤30 pF load; enables reliable register read/write at full PHY polling rates.
SMBus Power Management	GPIO Voltage Adaptation
Use Scenario: Linking a 3.3-V PMBus host controller to 1.0-V VRM telemetry sensors in server CPU voltage regulation modules. IC Role / Device Role / Timing Role: Bidirectional SMBus-compatible translator ensuring correct logic thresholds and bus contention avoidance during dynamic voltage scaling. Use Value: Maintains SMBus alert response time and packet integrity across voltage domains; supports 100 kHz–400 kHz operation with <1 ns skew.	Use Scenario: Adapting 5-V industrial PLC GPIO outputs to 1.8-V microcontroller inputs in factory automation HMIs. IC Role / Device Role / Timing Role: Unidirectional or bidirectional GPIO level shifter supporting push-pull or open-drain configurations without external direction logic. Use Value: Enables direct connection without series resistors or voltage dividers; preserves GPIO interrupt latency and noise margin at 125°C ambient.

I²C Bus Bridging

MDIO Interface Translation

Use Scenario: Connecting a 1.8-V FPGA I²C controller to a 3.3-V EEPROM or temperature sensor in telecom line cards.

IC Role / Device Role / Timing Role: Auto-directional voltage translator enabling bidirectional SDA/SCL signaling without clock stretching or protocol modification.

Use Value: Eliminates need for dual-supply buffers or discrete MOSFET solutions; maintains 400 kHz–1 MHz I²C timing compliance with <0.7 ns propagation delay.

Use Scenario: Interfacing a 2.5-V PHY management interface (MDIO) to a 1.2-V Ethernet MAC in enterprise switch ASIC designs.

IC Role / Device Role / Timing Role: Level-shifting MDIO data and MDC clock between mismatched voltage domains while preserving open-drain drive capability.

Use Value: Supports IEEE 802.3-compliant MDIO timing with ≤30 pF load; enables reliable register read/write at full PHY polling rates.

SMBus Power Management

GPIO Voltage Adaptation

Use Scenario: Linking a 3.3-V PMBus host controller to 1.0-V VRM telemetry sensors in server CPU voltage regulation modules.

IC Role / Device Role / Timing Role: Bidirectional SMBus-compatible translator ensuring correct logic thresholds and bus contention avoidance during dynamic voltage scaling.

Use Value: Maintains SMBus alert response time and packet integrity across voltage domains; supports 100 kHz–400 kHz operation with <1 ns skew.

Use Scenario: Adapting 5-V industrial PLC GPIO outputs to 1.8-V microcontroller inputs in factory automation HMIs.

IC Role / Device Role / Timing Role: Unidirectional or bidirectional GPIO level shifter supporting push-pull or open-drain configurations without external direction logic.

Use Value: Enables direct connection without series resistors or voltage dividers; preserves GPIO interrupt latency and noise margin at 125°C ambient.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional level translation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TXS0101DRYR	Buffer-based architecture with integrated direction control; higher ICC (20 µA typ); requires DIR pin; supports 1.65–5.5 V on both sides.	Preferred where precise timing control, higher drive strength, or guaranteed unidirectional mode is needed - e.g., SPI clock domains.	Select TXS0101DRYR only if DIR pin availability exists and auto-directionality is not required; avoid for I²C due to added complexity.
SN74AVC1T45DBVR	Direction-controlled, dual-supply buffer; 3-state output; lower R_ON (~3 Ω); no Vref_B biasing; supports 1.2–3.6 V translation.	Suitable for push-pull-only interfaces requiring strict VOL/VOL control and 3-state isolation - e.g., JTAG or debug ports.	Choose SN74AVC1T45DBVR when deterministic direction control and sub-10 ns tPD are mandatory; not viable for open-drain buses like I²C.

Compared with TXS0101DRYR and SN74AVC1T45DBVR, the LSF0101DTQR uniquely eliminates direction control overhead and enables true open-drain compatibility - making it the only choice for standard I²C/SMBus implementations where pin count, layout simplicity, and protocol transparency are critical.

Availability

LSF0101DTQR is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control systems, and enterprise server management requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability validation.

Supply support for LSF0101DTQR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 90 years of innovation in precision analog design and industrial-grade IC development.

The LSF0101DTQR belongs to TI's LSF family of auto-bidirectional level translators, engineered specifically for voltage-domain bridging in open-drain and push-pull interfaces - targeting I²C, SMBus, PMBus, MDIO, and GPIO applications in telecom, enterprise, and industrial systems.

FAQ

What is the recommended biasing method for the EN pin on the LSF0101DTQR?

The EN pin on the LSF0101DTQR must be tied directly to Vref_B and pulled up to VCCB through a 200 kΩ resistor. This configuration ensures proper internal biasing for translation functionality and places all I/Os in high-impedance state when EN is driven LOW. Direct push-pull driving of EN is prohibited and causes malfunction - the LSF0101DTQR relies on Vref_B regulation for stable operation.

Can the LSF0101DTQR translate between 1.0 V and 5.0 V domains?

Yes, the LSF0101DTQR supports 0.95 V ↔ 5 V bidirectional translation per its specification. With Vref_A = 1.0 V and Vref_B = 5.0 V (meeting Vref_B ≥ Vref_A + 0.8 V), the device enables full logic-level compatibility. RON remains ≤20 Ω at 10 mA, ensuring valid LOW levels on both sides - confirmed in Section 6.5 Electrical Characteristics of the LSF0101DTQR datasheet.

Does the LSF0101DTQR require external pull-up resistors?

Yes - external pull-up resistors are mandatory on the B-side (high-voltage domain) for up translation and recommended on the A-side for down translation when leakage exceeds 1 µA. Pull-up values depend on VPU and desired sink current; Table 9-3 in the LSF0101DTQR datasheet provides validated resistor selections (e.g., 406 Ω @ 3.3 V for 8 mA).

How does the LSF0101DTQR handle thermal dissipation in compact packages?

The LSF0101DTQR in DTQ (X2SON-6) package has RθJA = 294.4°C/W. At 64 mA continuous channel current and 8 Ω RON, power dissipation is ~33 mW - resulting in <10°C junction rise above ambient. PCB layout with thermal vias under GND pad is recommended to maintain operation within –40°C to 125°C range per LSF0101DTQR specifications.

Is the LSF0101DTQR compatible with I²C fast-mode plus (1 Mbps)?

Yes - the LSF0101DTQR achieves ≤0.7 ns tPHL at 30 pF load, supporting >100 MHz down translation. When paired with appropriate pull-ups (e.g., 1.8 kΩ for 3.3 V → 1.8 V), it meets I²C fast-mode plus timing requirements including t_FALL, t_LOW, and VOL specs - verified in Figure 9-4 (2.5 MHz waveform) and Section 6.6 AC performance of the LSF0101DTQR datasheet.

LSF0101DTQR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:

Packaging:: Tape & Reel (TR)

Product Status:: Active

Translator Type:: Voltage Level

Channel Type:: Bidirectional

Number of Circuits:: 1

Channels per Circuit:: 1

Voltage - VCCA:: 0.95 V ~ 4.5 V

Voltage - VCCB:: 1.8 V ~ 5.5 V

Input Signal:: -

Output Signal:: -

Output Type:: Open Drain, Push-Pull

Data Rate:: -

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Features:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 6-XFDFN

LSF0101DTQR FAQ

1.How can I place an order for LSF0101DTQR through Aetrix?

Please submit a Request for Quotation (RFQ) for LSF0101DTQR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LSF0101DTQR reliable?

The price and inventory of LSF0101DTQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LSF0101DTQR is usually 5 days.

3.What payment methods are accepted for LSF0101DTQR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LSF0101DTQR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LSF0101DTQR?

LSF0101DTQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LSF0101DTQR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LSF0101DTQR?

For technical support, including LSF0101DTQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LSF0101DTQR requirements.

6.How does Aetrix verify that LSF0101DTQR is sourced from the original manufacturer or authorized distributors?

All LSF0101DTQR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LSF0101DTQR meets industry standards.

7.What is the process for return or replacement of LSF0101DTQR?

All LSF0101DTQR units undergo pre-shipment inspection (PSI). If there is an issue with LSF0101DTQR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LSF0101DTQR part is unused and in its original packaging.

Return procedure for LSF0101DTQR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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