LSF0101 - 1-Bit Auto-Bidirectional Level Translator | Texas Instruments
料号： LSF0101 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.28 | $0.28 |
| 10 | $0.24 | $2.40 |
| 100 | $0.15 | $15.00 |
| 500 | $0.12 | $60.00 |
| 1,000 | $0.09 | $90.00 |
LSF0101 概述
A level translator (also called a voltage shifter or logic-level converter) is an interface IC that safely connects circuits operating at different supply voltages - for example a 1.8 V microcontroller communicating with a 3.3 V or 5 V peripheral. Level translators belong to the broader voltage translator / logic IC hierarchy within interface semiconductors, and the LSF0101 is the smallest, single-bit member of the TI/Nexperia LSF family.
Key features include automatic bidirectional operation with no DIR control signal, up-translation of up to 100 MHz and down translation of 100 MHz or more at a capacitive load of 30 pF or less, and 5 V tolerant I/O pins for TTL compatibility. According to the TI and Nexperia datasheets, the pass-gate (NFET) switch architecture delivers very low propagation delay and supports both open-drain two-wire buses and push-pull interfaces.
The reference-bias topology (VREF_A / VREF_B) defines the two voltage domains; the low-side reference is applied through the EN pin bias network and an analog pass switch connects the A and B pins. This makes the LSF0101 especially suitable for two-wire buses where direction changes asynchronously - something buffered push-pull translators cannot handle without a direction input.
Typical applications include I2C, SMBus, and PMBus level shifting, 1.8 V to 3.3 V or 5 V mixed-voltage MCU peripherals, industrial control buses, and mobile or wearable designs where the 1 x 0.8 mm X2SON footprint conserves board area.
Design consideration: the LSF family requires correct pull-up resistor sizing on open-drain buses to meet rise-time targets; the reference-side bias resistor (typically 200 kohm per TI datasheet guidance) sets translation speed, so verify its value against bus capacitance and data rate before production.
直接替换替代料： LSF0101 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
LSF0101DTQR
✅ 直接替换📋 参考替代料（不在目录中）
LSF0101GX
✅ 直接替换📋 参考替代料（不在目录中）
LSF0102-Q1
⚡ 相同封装✓ 有现货
联系询价
查看数据手册 →LSF0101 规格参数
| 功能 | 1-channel bidirectional multi-voltage level translator |
| 通道数 | 1 |
| Direction Control | Auto-bidirectional (no DIR pin) |
| Applications | Open-drain and push-pull |
| Up Translation Speed | Up to 100 MHz |
| Down Translation Speed | >= 100 MHz at <= 30 pF load |
| I/O Tolerance | 5 V tolerant I/O pins (TTL compatible) |
| Architecture | Pass-gate (NFET) switch, VREF_A / VREF_B bias |
| 封装 | 6-X2SON (1 x 0.8 mm) |
| 安装类型 | Surface Mount |
| Typical Bias Resistor | 200 kohm (reference-side, per TI datasheet guidance) |
| RoHS 状态 | Compliant |
| 生命周期状态 | Active |
LSF0101 引脚配置
| 引脚 1 | VREF_B — B-side reference voltage (higher domain) |
| 引脚 2 | B — B-side bidirectional I/O |
| 引脚 3 | GND — Ground |
| 引脚 4 | EN — Enable / low-side reference bias node (200 kohm to GND) |
| 引脚 5 | A — A-side bidirectional I/O |
| 引脚 6 | VREF_A — A-side reference voltage (lower domain) |
典型应用
LSF0101 适用于 6 应用s: I2C Bus Level Shifting, PMBus Power Supply Management, Mixed-Voltage MCU Peripherals, Automotive Body and Control Modules, Wearables and Mobile Devices, Industrial Control and PLC I/O.
I2C Bus Level Shifting
The LSF0101's pass-gate NFET architecture is inherently bidirectional with no direction pin, matching the wired-AND open-drain behavior of I2C perfectly. Per the TI datasheet, it supports >= 100 MHz down-translation at <= 30 pF load, comfortably covering standard (100 kHz), fast (400 kHz), and fast-mode plus (1 MHz) I2C. Placed between a 1.8 V controller and a 3.3 V or 5 V sensor, each side pulls up through appropriately sized resistors; the 200 kohm reference-side bias resistor sets the translation speed, so verify it against bus capacitance and target data rate before production.
推荐
PMBus Power Supply Management
PMBus power controllers and hot-swap monitors often run at 3.3 V while low-voltage microcontrollers and FPGAs operate at 1.8 V or lower. The LSF0101 bridges one PMBus line without a direction signal, essential because PMBus transactions change direction asynchronously at the protocol level. Its 5 V tolerant I/O covers legacy 5 V management buses, and its sub-1 mm X2SON footprint fits on crowded power-supply boards near POL converters. With 100 MHz class switching capability, PMBus speeds of 100-400 kHz see negligible propagation penalty, preserving bus timing margins across the voltage domain boundary.
推荐
Mixed-Voltage MCU Peripherals
Microcontrollers such as the TI MSP430 and MSPM0 families running at 1.8 V frequently need to talk to 3.3 V EEPROMs, displays, and industrial sensors. The LSF0101 provides a single-line bridge with 5 V tolerant I/O, eliminating damage risk when a 5 V peripheral drives the B side. Because it also handles push-pull signals up to 100 MHz, it serves SPI chip-select, UART, and GPIO lines as well as open-drain buses. Reference the TI LSF datasheet bias network guidance: the low-side VREF through the EN pin and a 200 kohm resistor establish the low-domain switching threshold automatically.
推荐
Automotive Body and Control Modules
The AEC-Q100 qualified LSF0102-Q1 family member extends LSF translation into automotive ECUs where 1.8 V MCUs interface with 3.3 V or 5 V sensors and LIN/CAN transceiver control lines. Using the same pass-gate architecture as the LSF0101, the family provides deterministic translation without direction pins - valuable in fault-tolerant automotive buses. TI reference designs pair LSF translators with TCAN and TLIN transceivers for body-domain modules. The X2SON package withstands standard AEC reflow profiles, and the 5 V tolerant I/O accommodates 5 V sensor outputs common in legacy vehicle platforms.
推荐
Wearables and Mobile Devices
Space-constrained wearable and mobile designs benefit from the LSF0101's 6-X2SON package of just 1 x 0.8 mm - among the smallest level-shifter footprints in the industry. Battery-powered systems often mix a 1.2 V to 1.8 V application processor with 1.8 V or 3.3 V sensor hubs, touch controllers, and fuel gauges. The pass-gate switch adds essentially no static current path in the translated signal, helping standby power budgets, and no direction control line reduces both GPIO usage and firmware complexity on tightly pin-limited wearable MCUs handling I2C sensor buses.
推荐
Industrial Control and PLC I/O
Industrial controllers mix legacy 5 V signaling with modern 3.3 V and 1.8 V logic. The LSF0101's 5 V tolerant I/O and TTL compatibility let one translated channel safely connect a low-voltage processor to 5 V proximity-sensor interface lines, optocoupler front ends, or SMBus-based power modules. The >= 100 MHz down-translation capability at <= 30 pF supports fast encoder or PWM feedback lines, not just slow buses. Per the TI datasheet, correct open-drain pull-up sizing keeps rise times within spec under the higher cable and connector capacitance typical of industrial backplanes, preserving noise margins in electrically noisy cabinets.
推荐
推荐产品汇总
工程参考数据： LSF0101 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LSF0101DTQR | LSF0101GX | LSF0102-Q1 |
|---|---|---|---|---|
| Package | 6-X2SON (1 x 0.8 mm) | 6-X2SON (1 x 0.8 mm) - same | 6-X2SON (1 x 0.8 mm) - same | 6-X2SON (1 x 0.8 mm) - same package, different pinout (2-ch) |
| Brand | Texas Instruments | Texas Instruments | Nexperia | Texas Instruments |
| Channels | 1 | 1 | 1 | 2 |
| Direction Pin | Not required (auto-bidirectional) | Not required | Not required | Not required |
| Up Translation Speed | Up to 100 MHz | Up to 100 MHz | Up to 100 MHz | Up to 100 MHz |
| I/O Tolerance | 5 V tolerant (TTL compatible) | 5 V tolerant | 5 V tolerant | 5 V tolerant |
| Applications | Open-drain and push-pull | Open-drain and push-pull | Open-drain and push-pull | Open-drain and push-pull |
关键差异点
- True auto-bidirectional pass-gate with no DIR pin （对比 SN74LVC1T45QDCKRQ1)
- Smallest footprint in the TI translator portfolio （对比 TXS0102-Q1)
- Identical cross-brand second source available （对比 LSF0101GX)
设计说明
The reference-side bias resistor on the EN pin (typically 200 kohm per TI LSF datasheet guidance) sets the reference current that determines translation speed. Too large a value limits up-translation speed on capacitive buses; too small wastes current and can exceed EN node ratings. Always verify this value against your bus capacitance and target data rate, and never tie EN directly to a supply without the bias network.
The 6-X2SON (1 x 0.8 mm) package places its lands under the package body. Follow the TI datasheet land-pattern drawing exactly, use via-in-pad or short escape vias for the center connections, and keep A/B trace stubs under 10 mm for 100 MHz signals. Place the part within a few millimeters of the bus connector or IC pins to minimize added capacitance on open-drain lines.
On open-drain buses such as I2C, rise time is set by pull-up resistance and total bus capacitance, not by the LSF0101 itself. With <= 30 pF load the part supports >= 100 MHz down-translation, but a 4.7 kohm pull-up with 50 pF of bus capacitance will limit an I2C bus to standard-mode speeds. Compute RC rise time against the bus protocol rise-time limit and choose pull-ups accordingly per the TI LSF application guidance.
合规信息
RoHS compliant per TI product page. AEC-Q100 qualified versions exist in the family (LSF0102-Q1); the standard LSF0101 is not -Q1 qualified.
