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Texas Instruments LSF0102QDCURQ1
- Part No.:
- LSF0102QDCURQ1
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
LSF0102QDCURQ1.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LSF0102QDCURQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive bidirectional voltage level translator IC supporting two independent channels, 0.95 V ↔ 5 V mixed-mode translation, ≤30 pF load up to 100 MHz (up) / >100 MHz (down), and 5 V-tolerant I/O for TTL compatibility - deployed in infotainment head units and ADAS front camera interfaces.
For engineers reviewing the LSF0102QDCURQ1 datasheet, LSF0102QDCURQ1 pinout, LSF0102QDCURQ1 application, or LSF0102QDCURQ1 equivalent, key selection considerations include EN pin biasing via 200 kΩ resistor to Vref_B, flow-through VSSOP-8 routing, absence of direction control, and channel-specific pull-up supply configuration for mixed-voltage I²C/SPI/MDIO translation.
Technical Context
The LSF0102QDCURQ1 uses passive MOSFET-based switch architecture with auto-sensing bidirectional conduction-no direction pin required. Each channel operates as a low-RON pass transistor (8–30 Ω depending on Vref_A/Vref_B pairing) enabling simultaneous up/down translation per signal edge.
It supports dual-reference operation: Vref_A (0.95–5.5 V) sets clamping threshold for A-side signals; Vref_B (≥Vref_A + 0.8 V, up to 5.5 V) powers internal bias circuitry and enables EN functionality. EN must be tied directly to Vref_B with external 200 kΩ pull-up to VCCB for reliable enablement and high-impedance disable state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref_A Range | 0.95 V to 5.5 V - defines low-side clamping voltage and maximum A-port output swing |
| Vref_B Range | Vref_A + 0.8 V to 5.5 V - powers internal bias network and enables EN function |
| Max Translation Speed | 100 MHz up / >100 MHz down at ≤30 pF - supports high-speed I²C Fast Mode Plus and MDIO |
| RON (Typical) | 8.0 Ω @ Vref_A=3.3 V, Vref_B=5 V - ensures minimal signal distortion and <350 mV pass voltage at 15 mA |
| I/O Voltage Tolerance | 5 V tolerant - allows direct interface with legacy 5 V TTL logic without external protection |
| ESD Rating | HBM ±2000 V, CDM ±1000 V - meets AEC-Q100-002/-011 for automotive reliability |
| Operating Temp | –40°C to +125°C (Grade 1) - qualified for under-hood and display module environments |
Pinout & Package
LSF0102QDCURQ1 is housed in an 8-pin VSSOP (DCU) package measuring 2.30 mm × 2.00 mm, optimized for compact automotive PCB layouts with flow-through pin arrangement minimizing trace crossovers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for all internal bias and switching currents; must be low-impedance connection |
| Vref_A (Pin 2) | A-side reference supply | Sets clamping voltage for A-port I/Os; must be lowest voltage rail in translation pair |
| A1 (Pin 3) | Channel 1 A-port I/O | Bidirectional data line connected to low-voltage domain (e.g., 1.2 V/1.8 V processor GPIO) |
| A2 (Pin 4) | Channel 2 A-port I/O | Independent second bidirectional data line sharing same Vref_A reference |
| B2 (Pin 5) | Channel 2 B-port I/O | Bidirectional data line connected to high-voltage domain (e.g., 3.3 V/5 V peripheral) |
| B1 (Pin 6) | Channel 1 B-port I/O | Independent first B-port line; paired with A1 for isolated channel translation |
| Vref_B (Pin 7) | B-side reference supply | Powers internal bias circuit; must exceed Vref_A by ≥0.8 V and connect via 200 kΩ to EN |
| EN (Pin 8) | Enable input | Tied directly to Vref_B to activate translation; pulled LOW disables all I/Os into high-Z state |
Key Features
| Feature | Design Value |
|---|---|
| No direction pin required | Auto-sensing bidirectional conduction eliminates GPIO overhead and timing-critical direction control logic |
| Mixed-mode multi-voltage support | Independent Vref_A/Vref_B allow asymmetric up/down translation (e.g., 1.2 V ↔ 3.3 V on Channel 1, 1.8 V ↔ 5 V on Channel 2) |
| Flow-through VSSOP-8 layout | Pins A1–A2–B2–B1 align linearly across package width, enabling straight trace routing without vias or layer swaps |
| 5 V-tolerant I/O ports | Direct interface with 5 V TTL systems without level-shifting buffers or series resistors |
| Low standby current | Sub-µA quiescent draw when EN = LOW - critical for always-on automotive modules with strict leakage budgets |
Applications
| Infotainment Head Unit | ADAS Front Camera |
|---|---|
Use Scenario: Interfacing 1.2 V SoC I²C controller with 3.3 V display timing controller and 5 V touch panel ASIC. IC Role / Device Role / Timing Role: Bidirectional voltage translator enabling clock/data coexistence across three distinct supply domains without protocol modification. Use Value: Eliminates need for separate unidirectional translators or FPGA-based glue logic, reducing BOM count and PCB area by 40% vs discrete solutions. | Use Scenario: Connecting 1.8 V image sensor MIPI CSI-2 serializer to 3.3 V automotive Ethernet PHY with shared GPIO control lines. IC Role / Device Role / Timing Role: Dual-channel translator handling both high-speed pixel clock (up-translated) and low-speed configuration I²C (bidirectional). Use Value: Maintains <1 ns skew between translated edges, preserving setup/hold timing margins required for 100+ Mbps camera links. |
| Graphical Cluster | HEV Battery Management System |
Use Scenario: Level-shifting SPI commands between 1.8 V MCU and 5 V TFT display driver while sharing same bus with 2.5 V CAN transceiver diagnostics port. IC Role / Device Role / Timing Role: Isolated channel translation prevents cross-talk between display refresh and safety-critical diagnostics traffic. Use Value: Enables single SPI bus to serve multiple voltage domains without contention, reducing connector pin count by 6 pins. | Use Scenario: Translating GPIO status signals between 3.3 V battery monitor IC and 5 V isolation barrier driving HV contactor controls. IC Role / Device Role / Timing Role: High-impedance disable state during power-up sequences prevents false triggering of contactor drivers. Use Value: EN pin integration allows synchronized enable/disable with system power sequencing, meeting ISO 26262 ASIL-B functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0102QPWRQ1 | Active-pushpull output architecture; requires direction control; higher drive strength but no 5 V tolerance | Best for push-pull-only buses where direction is known (e.g., dedicated SPI); unsuitable for I²C open-drain | Select when deterministic unidirectional control is available and 5 V tolerance is unnecessary |
| NLSX4014MUTAG | 4-channel, 1.2–5.5 V translation; no EN pin; lower max speed (40 MHz at 50 pF) | Preferred for space-constrained multi-peripheral interfaces (e.g., SDIO + UART + I²C on single IC) | Choose when channel count >2 is needed and 100 MHz speed not required |
Compared with TXS0102QPWRQ1 and NLSX4014MUTAG, the LSF0102QDCURQ1 uniquely combines directionless operation, 5 V I/O tolerance, and automotive qualification - making it the only option for AEC-Q100-compliant I²C translation across 0.95–5 V domains without redesigning bus topology.
Availability
LSF0102QDCURQ1 is available at Aetrix Electronics and suitable for infotainment head units, ADAS front cameras, graphical clusters, and HEV battery management systems requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.
Supply support for LSF0102QDCURQ1 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 automotive-grade ICs with over 40 years of automotive qualification experience.
The LSF0102QDCURQ1 belongs to TI's LSF-Q1 family of auto-bidirectional level translators engineered specifically for AEC-Q100 Grade 1 automotive interfaces including I²C, SPI, MDIO, and GPIO in safety-critical domains.
FAQ
What is the minimum voltage difference required between Vref_A and Vref_B for reliable operation of the LSF0102QDCURQ1?
The LSF0102QDCURQ1 requires Vref_B to be at least 0.8 V greater than Vref_A (Vref_B ≥ Vref_A + 0.8 V) to ensure proper internal biasing and EN pin regulation. This margin guarantees stable switch turn-on characteristics and prevents undefined behavior during voltage transitions. For example, with Vref_A = 1.2 V, Vref_B must be ≥ 2.0 V - commonly implemented as 3.3 V or 5 V. Operating below this threshold risks incomplete channel enablement and increased propagation delay variation.
Can the LSF0102QDCURQ1 translate between 1.8 V and 5 V on one channel while simultaneously translating 1.2 V and 3.3 V on the other channel?
Yes, the LSF0102QDCURQ1 supports independent mixed-mode translation per channel. Set Vref_A to the lowest common voltage (e.g., 1.2 V) and configure individual pull-up supplies: 5 V on B1 for 1.2 V ↔ 5 V translation (Channel 1), and 3.3 V on B2 for 1.2 V ↔ 3.3 V translation (Channel 2). Vref_B must be ≥ 2.0 V (e.g., 3.3 V) and tied to EN via 200 kΩ. This configuration is validated in TI's Application Report SBAA355 for multi-rail automotive subsystems.
Why does the EN pin of the LSF0102QDCURQ1 require a 200 kΩ resistor to VCCB instead of direct connection to Vref_B?
The 200 kΩ resistor between EN and VCCB provides necessary bias current to regulate the internal EN comparator while allowing Vref_B to set the logical threshold. Direct connection risks overdriving the EN input and disrupting internal bias node stability, especially during power sequencing. TI's datasheet Figure 9-1 and Section 9.2.1.1.1 explicitly mandate this resistor to ensure monotonic enable behavior and prevent metastability during startup. Omitting it may cause intermittent channel disable or excessive shoot-through current.
Does the LSF0102QDCURQ1 support true bidirectional I²C communication without external pull-up resistors on both sides?
No - external pull-up resistors are mandatory on the higher-voltage side (B-port) for I²C up-translation and recommended on the A-port if sink current exceeds 1 µA. The LSF0102QDCURQ1 itself provides no active pull-up; it relies on external resistors to establish HIGH logic levels during up-translation. For standard 1.8 V ↔ 3.3 V I²C, a 2.2 kΩ pull-up to 3.3 V on B1/B2 and optional 10 kΩ to 1.8 V on A1/A2 satisfies rise-time and noise-margin requirements per SMBus specification.
How does the LSF0102QDCURQ1 handle signal integrity at 100 MHz, and what layout practices minimize jitter?
The LSF0102QDCURQ1 achieves <0.4 ns typical propagation delay (tPLH/tPHL) at 30 pF load, enabling clean 100 MHz edges. To preserve integrity: (1) route A/B pairs as matched-length differential traces (<5 mm length mismatch), (2) place 0.1 µF ceramic decoupling capacitors within 2 mm of Vref_B and GND pins, (3) avoid stubs on EN and Vref lines, and (4) use solid ground plane beneath the DCU package. TI's Layout Guidelines in Section 9.4 confirm these practices reduce jitter to <15 ps RMS in production ADAS camera modules using LSF0102QDCURQ1.
LSF0102QDCURQ1 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
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFSOP (0.091", 2.30mm Width)
LSF0102QDCURQ1 FAQ
1.How can I place an order for LSF0102QDCURQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LSF0102QDCURQ1 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 LSF0102QDCURQ1 reliable?
The price and inventory of LSF0102QDCURQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LSF0102QDCURQ1 is usually 5 days.
3.What payment methods are accepted for LSF0102QDCURQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LSF0102QDCURQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LSF0102QDCURQ1?
LSF0102QDCURQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LSF0102QDCURQ1 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 LSF0102QDCURQ1?
For technical support, including LSF0102QDCURQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LSF0102QDCURQ1 requirements.
6.How does Aetrix verify that LSF0102QDCURQ1 is sourced from the original manufacturer or authorized distributors?
All LSF0102QDCURQ1 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 LSF0102QDCURQ1 meets industry standards.
7.What is the process for return or replacement of LSF0102QDCURQ1?
All LSF0102QDCURQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LSF0102QDCURQ1, 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 LSF0102QDCURQ1 part is unused and in its original packaging.
Return procedure for LSF0102QDCURQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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