Nexperia USA Inc. LSF0108PWJ

Overview

LSF0108PWJ from Nexperia is an 8-channel bidirectional multi-voltage level translator supporting open-drain and push-pull interfaces, with up/down translation rates ≤100 MHz and ≥100 MHz respectively at ≤30 pF load, 5 V-tolerant I/O pins, and no direction pin required. It enables voltage translation between 0.95 V–5.0 V pairs (e.g., 1.8 V ↔ 3.3 V) in I²C, SMBus, and GPIO interconnects within telecom infrastructure and industrial control systems.

For engineers reviewing the LSF0108PWJ datasheet, LSF0108PWJ pinout, LSF0108PWJ application, or LSF0108PWJ equivalent, this device delivers flexible per-channel voltage mapping, flow-through TSSOP20 routing, hot-insertion support, and operation across –40 °C to +125 °C - critical for mixed-voltage board-level signal integrity and legacy-to-modern interface bridging.

Technical Context

The LSF0108PWJ uses passive MOSFET-based translation architecture with dual reference inputs (refA and refB) to establish independent A-side and B-side voltage domains. Its enable-controlled high-impedance state and lack of direction pin eliminate timing-critical control signals and simplify PCB layout.

It supports simultaneous up-translation (e.g., 1.8 V logic driving 3.3 V bus) and down-translation (e.g., 3.3 V ACK pulled by 1.8 V device) on each channel, with propagation delays as low as 0.75 ns (tPHL, VrefA = 2.3 V, CL = 15 pF) and ON-resistance under 7 Ω depending on rail configuration.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1), 4.4 mm body width, 0.65 mm pitch, 1.1 mm max height; thermally enhanced with exposed pad (non-soldered by default).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0108E and SN74AVC8T245, the LSF0108PWJ uniquely eliminates direction control overhead, supports wider voltage combinations (including 0.95 V ↔ 5.0 V), and provides native hot-insertion capability via EN - making it optimal for dynamic, mixed-voltage system interconnects where reliability and layout simplicity are prioritized.

Availability

LSF0108PWJ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and personal computing applications requiring stable component supply, extended temperature operation, and long-term obsolescence management.

Supply support for LSF0108PWJ 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

Nexperia is a leading semiconductor manufacturer specializing in high-performance logic, discrete, and MOSFET solutions, with global R&D and manufacturing facilities focused on reliability and efficiency.

The LSF series targets high-speed, low-power bidirectional level translation for modern mixed-voltage digital systems - designed specifically to replace discrete MOSFET solutions in I²C, SMBus, MDIO, and GPIO applications.

FAQ

What is the maximum capacitive load the LSF0108PWJ can drive while maintaining 100 MHz translation?

The LSF0108PWJ guarantees ≤100 MHz up-translation and ≥100 MHz down-translation only at ≤30 pF total load capacitance per channel, including PCB trace, probe, and device pin capacitance. At 50 pF, maximum supported frequency drops to 50 MHz. Exceeding 30 pF requires derating or signal integrity validation.

Can refA and refB be set to the same voltage, and what effect does that have?

Yes, refA and refB may be tied to the same voltage (e.g., both at 3.3 V), resulting in unity-gain buffer operation with bidirectional pass-through and low RON (<4 Ω). This configuration retains hot-insertion capability via EN and provides ESD-hardened, low-distortion signal routing without direction control.

Is the exposed thermal pad on the TSSOP20 package electrically connected, and must it be soldered?

No - the exposed pad in SOT360-1 (TSSOP20) is not electrically connected to any internal node. Per Nexperia's datasheet, it has no electrical or mechanical requirement to be soldered. If soldered, it must remain floating or be connected to GND; no thermal performance gain is guaranteed without proper thermal vias and copper area.

Does the LSF0108PWJ support true open-drain operation on both sides simultaneously?

Yes - the LSF0108PWJ preserves open-drain behavior on both A and B sides when used with external pull-ups. Its MOSFET structure allows either side to sink current while the other floats, enabling standard I²C/SMBus arbitration and wired-AND logic without added components or timing constraints.