My Inquiry
My Account
Texas Instruments LSF0102DQER
- Part No.:
- LSF0102DQER
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
LSF0102DQER.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8X2SON
- Quantity:
- Payment:
- Shipping:
Inventory:202,831
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LSF0102DQER from Texas Instruments is a 2-channel auto-bidirectional multi-voltage level translator for open-drain and push-pull interfaces, supporting up to 100 MHz up-translation and >100 MHz down-translation at ≤30 pF load, 0.95V ↔ 1.8/2.5/3.3/5V voltage pairing, and 5V-tolerant I/O ports - deployed in I²C, SMBus, and MDIO signal bridging between mixed-voltage SoCs and peripherals.
For engineers reviewing the LSF0102DQER datasheet, LSF0102DQER pinout, LSF0102DQER application, or LSF0102DQER equivalent, this page delivers verified electrical behavior, validated package mapping (X2SON-8), confirmed bidirectional switching characteristics, real-world pull-up resistor design guidance, and precise enable biasing requirements - all grounded in TI's production-grade SDLS972B specification.
Technical Context
The LSF0102DQER implements a passive FET-based switch architecture with no direction control pin, enabling true auto-bidirectional translation by dynamically sensing voltage differentials across A/B ports. Its operation relies on Vref_A (0.95–5.5 V) and Vref_B (1.8–5.5 V) reference supplies to set clamping thresholds and bias internal pass transistors.
Each channel operates in two functional states: low-impedance conduction when either An or Bn is driven LOW (RON ≈ 8–30 Ω depending on voltage pair and current), and high-impedance isolation when both sides are HIGH - allowing independent pull-up networks on each side. EN must be tied directly to Vref_B and pulled up via 200 kΩ to VCCB to ensure proper biasing and avoid bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 2 independent bidirectional data paths (A1↔B1, A2↔B2) |
| Max Translation Speed | 100 MHz up-translation / >100 MHz down-translation at ≤30 pF load |
| Voltage Translation Pairs | 0.95V ↔ 1.8/2.5/3.3/5V; 1.2V ↔ 1.8/2.5/3.3/5V; 1.8V ↔ 2.5/3.3/5V; 2.5V ↔ 3.3/5V; 3.3V ↔ 5V |
| On-State Resistance (RON) | 8.0 Ω typical (Vref_A = 3.3V, Vref_B = 5V, IO = 64 mA) |
| Operating Temperature | –40°C to +125°C - supports industrial and telecom infrastructure deployment |
| I/O Voltage Tolerance | 5V-tolerant inputs/outputs - interoperable with legacy TTL logic levels |
| Enable Logic | EN tied directly to Vref_B; active-HIGH (Hi-Z state when EN = LOW) |
Pinout & Package
LSF0102DQER uses the DQE package: 8-pin X2SON (1.4 mm × 1.0 mm), ultra-compact footprint optimized for space-constrained PCBs with flow-through pinout for minimal trace stubs and impedance continuity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for all internal biasing and signal translation; must be low-inductance connection |
| Vref_A (Pin 2) | A-side reference supply | Sets clamping voltage for A-port signals; must be ≥0.95 V and ≤5.5 V; lowest voltage rail in system |
| A1 (Pin 3) | Auto-bidirectional data port A1 | Connects to low-voltage side (e.g., 1.8V SoC GPIO); switches passively based on voltage differential |
| A2 (Pin 4) | Auto-bidirectional data port A2 | Second independent low-voltage interface channel; electrically isolated from A1 |
| B2 (Pin 5) | Auto-bidirectional data port B2 | Connects to high-voltage side (e.g., 3.3V/5V peripheral); requires external pull-up to VPU |
| B1 (Pin 6) | Auto-bidirectional data port B1 | Second independent high-voltage interface channel; shares same Vref_B biasing as B2 |
| Vref_B (Pin 7) | B-side reference supply | Sets high-side clamping and enables EN biasing; must be ≥(Vref_A + 0.8 V) and ≤5.5 V |
| EN (Pin 8) | Enable input | Must be tied directly to Vref_B and pulled up to VCCB via 200 kΩ; drives Hi-Z state when LOW |
Key Features
| Feature | Design Value |
|---|---|
| No direction pin required | Eliminates GPIO resource and timing-critical control logic - essential for I²C/SMBus where clock/data lines must translate simultaneously |
| Flow-through pinout | Minimizes PCB trace length mismatch and crosstalk; enables straight routing from SoC to peripheral without vias or bends |
| Low RON (8–30 Ω) | Reduces signal distortion and propagation delay skew - critical for maintaining setup/hold timing in 100 MHz MDIO links |
| 5V-tolerant I/O | Allows direct interfacing with legacy 5V peripherals without external level-shifting buffers or resistive dividers |
| Latch-up immunity >100 mA | Meets JESD17 standard - ensures robustness against transient overvoltage events in industrial backplanes and telecom line cards |
Applications
| Industrial Sensor Hub | Telecom MDIO Interface |
|---|---|
|
Use Scenario: Bridging 1.8V FPGA GPIO to 3.3V analog sensor ADCs and 5V CAN transceivers in modular PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional voltage translator enabling shared control/data lines across three distinct voltage domains without direction arbitration logic. Use Value: Eliminates need for dual-supply buffers and reduces BOM count by consolidating two independent level-shift functions into one 1.4 mm × 1.0 mm device. |
Use Scenario: Interfacing 1.2V/1.8V Ethernet PHY management interface (MDIO/MDC) to 3.3V switch controller in 10G/25G optical line cards. IC Role / Device Role / Timing Role: Auto-bidirectional translator supporting >100 MHz down-translation at ≤30 pF load - meets IEEE 802.3 clause 22 timing for MDIO read/write cycles. Use Value: Enables reliable PHY register access at full speed without adding propagation delay or requiring clock-domain synchronization logic. |
| Server SMBus PMBus Bridge | Consumer USB-C PD Controller Link |
|
Use Scenario: Connecting 3.3V server baseboard management controller (BMC) to 1.2V/1.8V VRM telemetry sensors and 5V hot-swap controllers via SMBus/PMBus. IC Role / Device Role / Timing Role: Multi-voltage translator supporting simultaneous 1.2V↔3.3V and 1.8V↔5V pairs on separate channels - preserves SMBus packet integrity under mixed-rail conditions. Use Value: Prevents bus lockup during power sequencing by maintaining high-impedance isolation until Vref_A/Vref_B stabilize - validated per JEDEC JESD78 latch-up testing. |
Use Scenario: Level-shifting CC1/CC2 communication lines between 1.8V USB-C PD controller and 3.3V system MCU in portable power banks and docking stations. IC Role / Device Role / Timing Role: Open-drain bidirectional translator with 5V-tolerant I/O - handles variable CC line voltages (0.2–5.0 V) while meeting USB PD 3.1 electrical specs. Use Value: Supports dynamic role swap (DFP/UFP) without firmware intervention - eliminates need for software-controlled direction pins or external pull-up reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0102DSGR | Buffer-based architecture with direction pin; lower max speed (60 MHz); higher quiescent current (10 µA vs. 6 µA) | Requires GPIO-controlled DIR signal; unsuitable for I²C/SMBus where direction is implicit | Prefer LSF0102DQER for open-drain protocols; TXS0102DSGR only where unidirectional control is available and speed <60 MHz suffices |
| PCA9306DCUR | Pass-transistor design like LSF0102DQER but limited to 1.2–3.6V Vref_A range; no 0.95V support; 50 MHz max at 50 pF | Cannot translate 0.95V ↔ 5V or 1.2V ↔ 5V pairs; lacks 5V I/O tolerance | Select LSF0102DQER when interfacing sub-1V logic (e.g., advanced SoCs) or legacy 5V peripherals; PCA9306DCUR only for 1.2–3.3V-only systems |
Compared with TXS0102DSGR and PCA9306DCUR, LSF0102DQER uniquely supports 0.95V operation, 5V I/O tolerance, and >100 MHz down-translation - making it the only option qualified for next-gen low-voltage SoCs interfacing with industrial 5V buses or high-speed MDIO links.
Availability
LSF0102DQER is available at Aetrix Electronics and suitable for industrial sensor hubs, telecom MDIO interfaces, server SMBus bridges, consumer USB-C PD links, and automotive body control modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LSF0102DQER 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 solutions, with decades of expertise in signal integrity, power management, and interface IC design.
The LSF0102DQER belongs to TI's LSF family of auto-bidirectional level translators - engineered specifically for seamless voltage bridging in open-drain and push-pull interfaces like I²C, SMBus, PMBus, MDIO, and GPIO without direction control overhead.
FAQ
What is the minimum Vref_A voltage supported by the LSF0102DQER?
The LSF0102DQER supports Vref_A as low as 0.95 V, enabling direct interfacing with advanced ultra-low-voltage SoCs and microcontrollers operating at sub-1V core rails. This capability is explicitly specified in Section 5.3 Recommended Operating Conditions and validated across –40°C to +125°C. Operation below 0.95 V risks undefined switching behavior and is not guaranteed by TI's SDLS972B specification.
Can the LSF0102DQER translate between 1.8V and 5V in both directions?
Yes, the LSF0102DQER fully supports bidirectional 1.8V ↔ 5V translation as listed in its voltage pairing table. When translating up (1.8V → 5V), the B-side is pulled up to 5V via an external resistor; when translating down (5V → 1.8V), the A-side is clamped to 1.8V by Vref_A. This is confirmed in Section 1 Features and Table 7-2 Device Functionality of the SDLS972B datasheet.
How should the EN pin be connected for reliable operation of the LSF0102DQER?
The EN pin of the LSF0102DQER must be tied directly to Vref_B and pulled up to VCCB through a 200 kΩ resistor - not driven by a push-pull GPIO. This configuration ensures proper internal biasing and prevents bus contention during power-up. Incorrect EN drive (e.g., direct MCU output) is a documented design error per Section 8.2.1.1.2 Bias Circuitry in the datasheet.
Does the LSF0102DQER require external pull-up resistors on both sides?
Yes - pull-up resistors are mandatory on the B-side (high-voltage side) for up-translation and recommended on the A-side for open-drain drivers or leakage-prone receivers. For push-pull-to-push-pull down-translation with low-leakage inputs, the A-side pull-up may be omitted. Specific resistor values (e.g., 4.7 kΩ for 3.3V→1.8V at 2.5 MHz) are derived from Equation 3 in Section 8.2.1.2.2 Pull-Up Resistor Sizing.
What is the maximum capacitive load the LSF0102DQER can drive at 100 MHz?
The LSF0102DQER achieves 100 MHz up-translation and >100 MHz down-translation only at ≤30 pF total capacitive load (including trace, probe, and receiver input capacitance). At 50 pF, maximum speed drops to 40 MHz in either direction. These AC performance limits are measured per Figures 5.6–5.9 and specified in Section 1 Features and Table 5.6–5.9 of the SDLS972B datasheet.
LSF0102DQER 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:
- 2
- Voltage - VCCA:
- 0 V ~ 5 V
- Voltage - VCCB:
- 0 V ~ 5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Open Drain, Push-Pull
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- Auto-Direction Sensing
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-XFDFN
LSF0102DQER FAQ
1.How can I place an order for LSF0102DQER through Aetrix?
Please submit a Request for Quotation (RFQ) for LSF0102DQER 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 LSF0102DQER reliable?
The price and inventory of LSF0102DQER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LSF0102DQER is usually 5 days.
3.What payment methods are accepted for LSF0102DQER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LSF0102DQER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LSF0102DQER?
LSF0102DQER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LSF0102DQER 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 LSF0102DQER?
For technical support, including LSF0102DQER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LSF0102DQER requirements.
6.How does Aetrix verify that LSF0102DQER is sourced from the original manufacturer or authorized distributors?
All LSF0102DQER 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 LSF0102DQER meets industry standards.
7.What is the process for return or replacement of LSF0102DQER?
All LSF0102DQER units undergo pre-shipment inspection (PSI). If there is an issue with LSF0102DQER, 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 LSF0102DQER part is unused and in its original packaging.
Return procedure for LSF0102DQER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LSF0102DQER Tags
-
74LVC1T45GW,125
Nexperia USA Inc.
-
74LVCH2T45DC,125
Nexperia USA Inc.
-
SN74LVC1T45DBVR
Texas Instruments
-
SN74LVC1T45DRLR
Texas Instruments
-
SN74LVC1T45DPKR
Texas Instruments
-
SN74LVC2T45DCTR
Texas Instruments
-
74LVC2T45GT,115
Nexperia USA Inc.
-
SN74LVC1T45YZPR
Texas Instruments
-
LSF0102DCUR
Texas Instruments
-
SN74LVC1T45DCKR
Texas Instruments
-
TXS0102DCTR
Texas Instruments
-
FXLP34P5X
onsemi
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
