Nexperia USA Inc. 74CBTLV3257GUX

Overview

74CBTLV3257GUX from Nexperia is a quad 1-of-2 CMOS bus switch multiplexer/demultiplexer with rail-to-rail analog switching, 5 Ω typical ON-resistance at 3.3 V, Schmitt-trigger control inputs, and IOFF partial power-down protection. It operates from 2.3 V to 3.6 V across –40 °C to +125 °C and is used in high-speed data path routing for FPGA I/O expansion and DDR memory interface isolation.

For engineers reviewing the 74CBTLV3257GUX datasheet, 74CBTLV3257GUX pinout, 74CBTLV3257GUX application, or 74CBTLV3257GUX equivalent, key selection criteria include its sub-0.25 ns propagation delay, 398 MHz –3 dB bandwidth, low ground-bounce noise, and compatibility with JEDEC JESD8-5/JESD8-B standards for 2.5 V/3.3 V systems.

Technical Context

This device implements four independent bidirectional analog switches, each selectable via a shared S (select) input and globally enabled/disabled by OE (active LOW). Its CMOS transmission-gate architecture enables rail-to-rail signal pass-through without level shifting, supporting both digital and analog signals up to 3.6 V.

Schmitt-trigger action on S and OE inputs ensures robust noise immunity across the full supply range, while the IOFF circuit blocks backflow current during power sequencing - critical for hot-swap and partial-power-down systems where VCC may be unpowered while I/O pins remain active.

Key Specifications

Pinout & Package

XQFN16 package (SOT1161-1): 1.80 × 2.60 × 0.50 mm body, 16-terminal no-lead thermal-enhanced quad flat package with exposed thermal pad (non-soldered or floating).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus switch applications.

Compared with SN74CBTLV3257PWR and 74LVC1G3157GW, the 74CBTLV3257GUX delivers superior density (quad in 1.8×2.6 mm), lowest ON-resistance among XQFN bus switches, and guaranteed IOFF behavior across full automotive temperature range - making it optimal for next-gen compact, thermally constrained systems.

Availability

74CBTLV3257GUX is available at Aetrix Electronics and suitable for PCIe signal routing, FPGA I/O expansion, and DDR memory interface isolation requiring stable component supply across automotive and industrial temperature grades.

Supply support for 74CBTLV3257GUX 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 delivering high-performance, reliable, and energy-efficient components for automotive, industrial, and consumer electronics markets.

The 74CBTLV3257GUX belongs to Nexperia's CBTLV (Configurable Bus Transceiver Low-Voltage) family, engineered for high-speed, low-distortion signal routing in space- and power-constrained digital systems.

FAQ

What is the maximum recommended load capacitance for maintaining specified propagation delay?

The datasheet specifies dynamic test conditions using 30 pF (for 2.3–2.7 V) and 50 pF (for 3.0–3.6 V) loads. Exceeding 50 pF increases propagation delay nonlinearly due to RC time constant effects; for >50 pF loads, derating curves in Figures 5–10 should be consulted to verify timing margin compliance.

Can 74CBTLV3257GUX be used with 1.8 V logic levels?

No - the absolute minimum supply voltage is 2.3 V, and VIH/VIL thresholds are defined only down to 2.3 V. At 1.8 V, the Schmitt-trigger inputs will not reliably recognize logic states, and ON-resistance rises significantly beyond specification limits, risking signal integrity failure.

Is the thermal pad on the XQFN16 package required to be soldered?

No - the exposed pad (terminal 1 index area) has no electrical or mechanical requirement to be soldered. If soldered, it must remain electrically floating or be connected to GND; improper connection risks shorting internal nodes or degrading thermal performance.

How does the IOFF feature behave when VCC is ramping during power-up?

IOFF activates automatically when VCC drops below ~0.8 V, blocking current flow before the internal logic becomes undefined. During power-up, IOFF remains active until VCC exceeds the minimum functional threshold (~2.3 V), ensuring no backfeed occurs even with partially powered downstream circuits.