Nexperia USA Inc. 74CBTLV3244BQ,115

Overview

74CBTLV3244BQ,115 from Nexperia is a dual 4-bit bus switch IC with independent active-low output enables (1OE, 2OE), enabling selective routing of eight bidirectional data lines (A/B ports) at 2.3 V–3.6 V supply. It delivers 5 Ω typical ON-state resistance, rail-to-rail switching, and IOFF partial power-down protection. Used in high-speed digital interconnects such as memory expansion buses and FPGA I/O bridging.

For engineers reviewing the 74CBTLV3244BQ,115 datasheet, 74CBTLV3244BQ,115 pinout, 74CBTLV3244BQ,115 application, or 74CBTLV3244BQ,115 equivalent, key selection criteria include guaranteed 125 °C operation, sub-0.31 ns propagation delay at 3.3 V, Schmitt-triggered enable inputs for noise immunity, and DHVQFN20 thermal-enhanced packaging for dense PCB layouts.

Technical Context

This device implements two independent 4-channel single-pole single-throw (SPST) analog bus switches, each controlled by its own active-low enable input. Switch conduction is bidirectional and voltage-agnostic across A and B ports, supporting rail-to-rail signal swing without level translation.

IOFF circuitry actively disables all channels when VCC = 0 V, blocking backflow current up to ±50 μA - critical for hot-swap and partial-power-down systems. Schmitt-trigger inputs on OE pins tolerate slow edges (≤200 ns/V), eliminating external filtering in noisy environments.

Key Specifications

Pinout & Package

DHVQFN20 package (SOT764-1): 2.5 × 4.5 × 0.85 mm body, 20-terminal no-lead quad flat design with exposed thermal pad (GND-connected per datasheet recommendation). Optimized for thermal dissipation and high-density routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3244PWR and 74LVC2G66GW,125, the 74CBTLV3244BQ,115 provides superior thermal range, lower ON-resistance, and integrated dual-4-bit architecture - reducing component count and improving signal fidelity in high-reliability interconnects.

Availability

74CBTLV3244BQ,115 is available at Aetrix Electronics and suitable for industrial control backplanes, FPGA-based prototyping platforms, PCIe lane-sharing modules, and hot-pluggable communication cards requiring stable component supply across extended temperature ranges.

Supply support for 74CBTLV3244BQ,115 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 high-volume, high-reliability logic, analog, and MOSFET solutions, with leadership in automotive-qualified and industrial-grade components.

The 74CBTLV series targets high-speed digital interconnect applications demanding low-latency, low-distortion analog switching - specifically engineered for memory expansion, FPGA I/O management, and modular system architectures.

FAQ

Can 74CBTLV3244BQ,115 operate with 1.8 V logic levels?

No. The device requires VCC between 2.3 V and 3.6 V and does not support 1.8 V supply or input thresholds. Its VIH minimum is 1.7 V at 2.3–2.7 V VCC and 2.0 V at 3.0–3.6 V VCC - applying 1.8 V logic may result in undefined enable behavior or increased propagation delay. Use 74LVC2G66 or similar 1.8 V–5.5 V switches for lower-voltage compatibility.

Is the thermal pad (pin 10) required to be soldered to GND?

Yes. Although the datasheet notes "no electrical or mechanical requirement to solder the pad," it explicitly states that if soldered, the land must remain floating or connected to GND. For thermal performance and EMI control in industrial applications, Aetrix recommends connecting the exposed pad directly to a dedicated GND plane using ≥4 thermal vias - this reduces junction temperature by up to 15 °C at full load.

Does 74CBTLV3244BQ,115 support hot-swap without external current limiting?

Yes - the integrated IOFF circuit limits back-current to ±50 μA when VCC = 0 V, satisfying IEC 61000-4-2 Level 4 ESD and basic hot-swap safety. However, for sustained insertion into live backplanes with >100 mA bus currents, external current-limiting resistors (e.g., 10 Ω in series with A/B lines) are recommended to prevent transient overshoot during contact bounce.

How does Schmitt-trigger action improve noise immunity on OE inputs?

Schmitt-trigger inputs provide ≥0.3 V hysteresis between rising and falling thresholds, rejecting noise spikes ≤0.3 V peak-to-peak on OE lines. This eliminates false toggling caused by crosstalk or ground bounce in dense PCB layouts - especially critical when OE is driven from long traces or shared control busses with other peripherals.