Nexperia USA Inc. LSF0108BQ-Q100X

Overview

LSF0108BQ-Q100 from Nexperia is an AEC-Q100 Grade 1 qualified 8-channel bidirectional multi-voltage level translator supporting open-drain and push-pull interfaces. It enables voltage translation between 0.95 V–5.0 V domains without direction control, delivers ≤100 MHz up-translation and ≥100 MHz down-translation at ≤30 pF load, and features 5 V-tolerant I/O for TTL compatibility in automotive infotainment and ADAS domain controllers.

For engineers reviewing the LSF0108BQ-Q100 datasheet, LSF0108BQ-Q100 pinout, LSF0108BQ-Q100 application, or LSF0108BQ-Q100 equivalent, this page provides verified functional behavior, DHVQFN20 package layout, channel-specific R_ON values (e.g., 3–7 Ω depending on V_refA), propagation delays under 2.1 ns, and automotive-grade thermal (-40 °C to +125 °C) and ESD (HBM >2000 V) specifications.

Technical Context

The LSF0108BQ-Q100 implements passive MOSFET-based bidirectional translation with dual reference inputs (refA and refB) enabling independent voltage domain configuration per channel pair. Its enable-controlled high-impedance state and flow-through pinout support hot insertion and simplified PCB routing in mixed-voltage SoC interconnects.

No direction pin is required: signal flow adapts automatically based on relative voltage levels at An/Bn terminals. Translation direction (up/down) is determined by the higher of V_refA and V_refB, with R_ON ranging from 3 Ω (V_refA = 2.5 V, I_O = 32 mA) to 7 Ω (V_refA = 1.0 V, I_O = 10 mA), ensuring minimal signal distortion across supported voltage combinations.

Key Specifications

Pinout & Package

DHVQFN20 package (SOT764-1): 2.5 × 4.5 × 0.85 mm body, side-wettable flanks for AOI-compatible solder joint inspection, no leads, 20-terminal layout with exposed thermal pad (non-electrical, optional GND connection).

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 LSF0108BQ-Q100 uniquely combines AEC-Q100 Grade 1 qualification, 5 V-tolerant I/O, directionless operation, and ≥100 MHz down-translation-making it the sole fit for automotive domain controllers requiring robust, flexible, and certified voltage bridging.

Availability

LSF0108BQ-Q100 is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS domain controllers, and industrial PLC backplanes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LSF0108BQ-Q100 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 global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, analog, and discrete components with automotive-grade reliability.

The LSF series targets automotive and industrial voltage translation challenges, designed specifically to replace discrete MOSFET solutions with integrated, AEC-Q100-qualified devices that simplify mixed-voltage system integration.

FAQ

What is the maximum capacitive load the LSF0108BQ-Q100 supports while maintaining 100 MHz down-translation?

The device guarantees ≥100 MHz down-translation performance with ≤30 pF total capacitive load, including PCB trace, connector, and destination input capacitance. At 50 pF, down-translation remains ≥50 MHz. Exceeding 30 pF degrades timing margin and may violate setup/hold requirements in high-speed interfaces like MDIO or I²C fast-mode plus.

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

Yes, refA and refB may be set to identical voltages (e.g., both at 3.3 V), resulting in symmetrical bidirectional translation with matched R_ON and propagation delay in both directions. This configuration is valid and commonly used for GPIO expansion where both sides operate at the same nominal voltage but require isolation or current drive enhancement.

Is the thermal pad on the DHVQFN20 package electrically connected, and how should it be handled?

No, the exposed thermal pad (terminal 1) is not electrically connected to any internal node. It may be left unconnected, floated, or tied to GND for improved thermal dissipation-no electrical requirement exists. If soldered to GND, the land must remain isolated from signal planes to avoid unintended coupling or ground loop formation.

Does the LSF0108BQ-Q100 support open-drain and push-pull outputs simultaneously on different channels?

Yes. Each A/B channel pair operates independently: one pair can interface with an open-drain bus (e.g., I²C SDA) while another connects to a push-pull GPIO (e.g., UART TX), provided refA/refB voltages and load conditions meet datasheet limits. The internal architecture imposes no restriction on mixing interface types across channels.