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Texas Instruments LSF0102YZTR
- Part No.:
- LSF0102YZTR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
LSF0102YZTR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,377
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Product details
Overview
LSF0102YZTR from Texas Instruments is a 2-channel auto-bidirectional multi-voltage level translator for open-drain and push-pull interfaces, supporting 0.95V ↔ 1.8/2.5/3.3/5V translation, ≤30pF load up to 100MHz down translation, 5V-tolerant I/O, and −40°C to 125°C operation - used in I²C, SMBus, PMBus, and MDIO signal bridging between mixed-voltage SoCs and peripherals.
For engineers reviewing the LSF0102YZTR datasheet, LSF0102YZTR pinout, LSF0102YZTR application, or LSF0102YZTR equivalent, key selection considerations include bidirectional translation without direction control, Vref_A/Vref_B voltage pairing constraints, EN biasing via 200kΩ resistor to Vref_B, and DSBGA-8 (YZT) package thermal and layout requirements.
Technical Context
The LSF0102YZTR implements a passive MOSFET-based switch architecture with no internal buffers or direction logic, enabling true auto-bidirectional translation by sensing voltage differentials across A/B ports. Its operation relies on external pull-up resistors on the high-side (B) and optional low-side (A) rails, with EN tied directly to Vref_B and biased through 200kΩ to VCCB.
Down translation occurs when the B-side drives LOW, turning ON the pass transistor to pull A-side LOW; up translation occurs when A-side is HIGH and OFF-state clamping at Vref_A allows B-side to be pulled up to VPU. Signal integrity depends critically on capacitive load (≤30pF for >100MHz), RON (8–30Ω depending on Vref pair), and proper bias circuit stability with 0.1µF decoupling on Vref_B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Translation Range | 0.95V ↔ 1.8/2.5/3.3/5V; enables interoperability between sub-1V logic and 5V TTL without direction pin |
| Max Translation Speed | 100MHz down / >100MHz up at ≤30pF; supports high-speed MDIO and SDIO clock domains |
| On-State Resistance (RON) | 8.0Ω typical (Vref_A=3.3V, Vref_B=5V); minimizes voltage drop and signal distortion during LOW-state conduction |
| I/O Voltage Tolerance | 5V-tolerant inputs/outputs; ensures compatibility with legacy 5V TTL signaling in industrial telecom systems |
| Operating Temperature | −40°C to +125°C; qualified for under-hood automotive, base station, and industrial embedded environments |
| Enable Control Logic | EN must be tied directly to Vref_B and pulled up to VCCB via 200kΩ; LOW disables all channels to Hi-Z |
| ESD Rating | ±2000V HBM; meets JEDEC JS-001 for robust handling in automated assembly and field service |
Pinout & Package
LSF0102YZTR uses the YZT package: 8-pin DSBGA (Die Size Ball Grid Array), 1.98mm × 0.98mm footprint, bottom-view ball layout, optimized for space-constrained portable and telecom modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2 | Auto-Bidirectional Data Port (Low-Side) | Connects to lower-voltage domain (e.g., 1.8V SoC GPIO); clamped to Vref_A when inactive |
| B1, B2 | Auto-Bidirectional Data Port (High-Side) | Connects to higher-voltage domain (e.g., 3.3V/5V peripheral); requires external pull-up to VPU |
| Vref_A | Reference Supply (Low-Side) | Defines maximum output voltage on A-side; must be lowest rail in translation pair (min 0.95V) |
| Vref_B | Reference Supply (High-Side) | Sets B-side bias point; must be ≥ Vref_A + 0.8V; regulates EN and enables translation |
| EN | Enable Input | Tied directly to Vref_B; pulled up to VCCB via 200kΩ; LOW forces all I/Os into high-impedance state |
| GND | Ground Reference | Common return path for both sides; must be low-inductance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| No direction pin required | Eliminates PCB routing complexity and firmware overhead for bidirectional protocols like I²C and SMBus |
| Flow-through pinout (DSBGA) | Enables straight trace routing across package; reduces crosstalk and improves signal integrity in dense layouts |
| Low standby current (6µA) | Supports always-on system monitoring paths without compromising battery life in portable equipment |
| Latch-up immunity >100mA | Meets JESD17 for robustness against transient overvoltage events in noisy industrial power environments |
| Flexible Vref pairing | Allows same device to translate 1.2V↔3.3V in one channel and 1.8V↔5V in another - ideal for mixed-voltage FPGAs |
Applications
| I²C Bus Bridging | SMBus/PMbus Interfacing |
|---|---|
|
Use Scenario: Connecting a 1.8V microcontroller I²C master to a 3.3V sensor slave in an industrial data acquisition module. IC Role / Device Role / Timing Role: Bidirectional level translator enabling SCL/SDA signal translation without clock stretching or protocol modification. Use Value: Maintains full 400kHz Fast Mode I²C timing compliance with <1.3ns propagation delay at 30pF load. |
Use Scenario: Isolating 5V PMBus host controller from 1.2V VRM telemetry in server power management subsystems. IC Role / Device Role / Timing Role: Voltage translator for PMBus Alert# and SMBus Alert signals between mismatched supply domains. Use Value: Supports 100kHz PMBus timing with 5V-tolerant inputs ensuring reliable fault reporting even during brown-out conditions. |
| MDIO Interface Translation | GPIO Voltage Domain Isolation |
|
Use Scenario: Bridging 2.5V PHY MDIO/MDC interface to 1.8V Ethernet MAC in telecom line cards. IC Role / Device Role / Timing Role: Auto-directional translator for MDIO bidirectional data and MDC clock lines. Use Value: Enables 25MHz MDIO operation per IEEE 802.3 clause 22, with <1.2ns tPLH/tPHL ensuring setup/hold margin. |
Use Scenario: Level-shifting 3.3V FPGA GPIOs to interface with 5V industrial actuators in PLC I/O modules. IC Role / Device Role / Timing Role: Push-pull compatible translator for general-purpose digital control and status lines. Use Value: Delivers 5V-tolerant outputs and 8Ω RON to drive 50mA loads while preserving logic thresholds across domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0102DRYR | Buffer-based architecture with integrated direction control; higher ICC (20µA), lower speed (60MHz max) | Requires direction signal; better for unidirectional or burst-mode protocols like SPI | Choose TXS0102DRYR only if direction control is available and signal integrity demands active buffering |
| SN74AVC2T244RSWR | Two-channel dual-supply bus transceiver with separate OE and DIR pins; 3.6V max VCC, no 5V tolerance | Not suitable for 5V-tolerant systems; requires explicit direction sequencing and additional control logic | Select SN74AVC2T244RSWR when translating between two sub-3.3V domains with strict timing control needs |
Compared with TXS0102DRYR and SN74AVC2T244RSWR, LSF0102YZTR uniquely eliminates direction logic overhead and supports 5V-tolerant I/O - making it optimal for legacy-compatible, always-bidirectional interfaces like I²C and MDIO where board space and firmware simplicity are critical.
Availability
LSF0102YZTR is available at Aetrix Electronics and suitable for telecom infrastructure, enterprise storage controllers, and industrial IoT gateways requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LSF0102YZTR 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 interface ICs and signal integrity engineering.
The LSF family was designed specifically for seamless, pin-efficient bidirectional voltage translation in mixed-supply systems - targeting I²C, SMBus, MDIO, and GPIO bridging in telecom, computing, and industrial applications.
FAQ
What is the correct way to connect the EN pin on LSF0102YZTR?
The EN pin on LSF0102YZTR must be tied directly to the Vref_B pin and pulled up to the high-side supply (VCCB) using a 200kΩ resistor. This configuration ensures proper biasing of the internal pass transistors and enables automatic bidirectional translation. Driving EN with a push-pull output violates the bias requirement and can cause malfunction or excessive current draw in the LSF0102YZTR.
Can LSF0102YZTR translate between 1.0V and 5V?
Yes, LSF0102YZTR supports 1.0V ↔ 5V translation when Vref_A = 1.0V and Vref_B = 5V, provided Vref_B ≥ Vref_A + 0.8V (per datasheet Section 8.2.1.1.2). At this pairing, RON is 10Ω typical, enabling reliable LOW-level conduction. However, signal rise time is load-dependent - keep total capacitance ≤30pF for >100MHz down translation performance in the LSF0102YZTR.
Does LSF0102YZTR require external pull-up resistors on both sides?
LSF0102YZTR requires external pull-up resistors on the B-side (high-voltage domain) for all configurations. Pull-ups on the A-side are optional and only needed if the A-side receiver has leakage >1µA or if additional drive strength is required. For open-drain interfaces like I²C, B-side pull-ups are mandatory; A-side pull-ups may be omitted in push-pull-to-push-pull down translation scenarios.
What is the maximum capacitive load supported by LSF0102YZTR at 100MHz?
LSF0102YZTR supports ≤30pF total capacitive load (including trace, probe, and device capacitance) for guaranteed 100MHz down translation and >100MHz up translation. At 50pF load, maximum speed drops to 40MHz in either direction. Exceeding 30pF at 100MHz risks timing violations due to increased RC delay - verify CL with network analyzer or TDR when designing high-speed MDIO or SDIO paths with LSF0102YZTR.
Is LSF0102YZTR suitable for automotive applications?
Yes, LSF0102YZTR is qualified for −40°C to +125°C operation and meets JESD17 latch-up immunity (>100mA), making it suitable for under-hood and infotainment applications. It is not AEC-Q200 certified out-of-box, but its thermal and ESD specs align with automotive subsystem requirements. For ASIL-B or safety-critical domains, system-level validation of the LSF0102YZTR in context remains the responsibility of the end designer.
LSF0102YZTR 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-UFBGA, DSBGA
LSF0102YZTR FAQ
1.How can I place an order for LSF0102YZTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LSF0102YZTR 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 LSF0102YZTR reliable?
The price and inventory of LSF0102YZTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LSF0102YZTR is usually 5 days.
3.What payment methods are accepted for LSF0102YZTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LSF0102YZTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LSF0102YZTR?
LSF0102YZTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LSF0102YZTR 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 LSF0102YZTR?
For technical support, including LSF0102YZTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LSF0102YZTR requirements.
6.How does Aetrix verify that LSF0102YZTR is sourced from the original manufacturer or authorized distributors?
All LSF0102YZTR 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 LSF0102YZTR meets industry standards.
7.What is the process for return or replacement of LSF0102YZTR?
All LSF0102YZTR units undergo pre-shipment inspection (PSI). If there is an issue with LSF0102YZTR, 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 LSF0102YZTR part is unused and in its original packaging.
Return procedure for LSF0102YZTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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