Nexperia USA Inc. 74CBTLV3125BQ,115

Overview

74CBTLV3125BQ,115 from Nexperia is a 4-bit high-speed CMOS bus switch with independent output enable inputs (1OE–4OE), rail-to-rail switching on all I/O ports, 5 Ω typical ON-resistance at 3.3 V, and operation across 2.3 V to 3.6 V supply. It enables low-latency signal routing in memory expansion, FPGA I/O bridging, and hot-swap data path isolation.

For engineers reviewing the 74CBTLV3125BQ,115 datasheet, 74CBTLV3125BQ,115 pinout, 74CBTLV3125BQ,115 application, or 74CBTLV3125BQ,115 equivalent, key selection considerations include its 0.2 ns propagation delay at 3.3 V, IOFF-enabled partial power-down protection, Schmitt-triggered OE inputs for noise immunity, and DHVQFN14 thermal-enhanced package for high-density PCB layouts.

Technical Context

This device implements four independent bilateral analog switches, each controlled by a dedicated OE input. Each switch exhibits rail-to-rail conduction (V_SW = 0 V to V_CC) and supports bidirectional signal flow between A and B ports without direction control logic.

The IOFF circuitry actively disables outputs and blocks backflow current when V_CC = 0 V, enabling safe hot-insertion in live backplanes. Schmitt-trigger action on all OE inputs ensures robust timing margin against slow-rising control signals across the full 2.3–3.6 V V_CC range.

Key Specifications

Pinout & Package

DHVQFN14 (SOT762-1) package: 2.5 mm × 3.0 mm × 0.85 mm body, 14-terminal no-lead quad flat design with exposed thermal pad (non-soldered or floating per datasheet guidance).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit bus switch applications.

Compared with SN74CBTLV3125PWR, the 74CBTLV3125BQ,115 offers superior thermal dissipation and lower parasitic inductance for high-frequency routing; versus 74LVC1G3157GW,125, it delivers true 4-channel independence, IOFF safety, and guaranteed 2.3–3.6 V operation essential for industrial backplane designs.

Availability

74CBTLV3125BQ,115 is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA I/O banking, hot-swap backplane isolation, and PCIe lane multiplexing requiring stable component supply across industrial temperature ranges.

Supply support for 74CBTLV3125BQ,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 delivering high-performance logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial, automotive, and computing applications.

The 74CBTLV3125 belongs to Nexperia's advanced bus switch product line, engineered specifically for low-latency, rail-to-rail signal routing in high-density digital systems with stringent power sequencing and thermal constraints.

FAQ

Is a pull-up resistor required on all OE pins for reliable power-up behavior?

Yes. To guarantee high-impedance OFF-state during power-up or power-down, each OE input (1OE–4OE) must be tied to V_CC via an external pull-up resistor. The minimum resistance value depends on the current-sinking capability of the driving source, but typical values range from 10 kΩ to 100 kΩ. This prevents unintended switch activation before control logic stabilizes.

Can the 74CBTLV3125BQ,115 be used to switch analog signals such as audio or sensor outputs?

No. Although it provides bidirectional conduction and rail-to-rail voltage handling, the device is characterized and qualified only for digital bus switching. Its ON-resistance variation over voltage (up to 25.5 Ω at V_IN = 2.4 V, V_CC = 3.6 V) and lack of THD/SNR specifications make it unsuitable for analog signal integrity-critical applications like audio or precision sensor interfaces.

What is the maximum recommended load capacitance for maintaining 0.2 ns propagation delay?

The 0.2 ns typical propagation delay is specified with a 50 pF load capacitance and 500 Ω termination, per Table 10. For loads exceeding 50 pF, delay increases linearly with RC time constant - e.g., at 100 pF, t_pd degrades to ~0.4 ns. Layout best practices recommend minimizing trace length and using ground planes to keep total node capacitance ≤50 pF for Gen3+ timing compliance.

Does the exposed thermal pad on the DHVQFN14 package require soldering to PCB ground?

No. Per Figure 5 and datasheet note (1), the thermal pad is not electrically connected and has no mechanical or electrical requirement for soldering. If soldered, the land must remain electrically floating or be connected to GND - but thermal performance gain is marginal (<10% improvement) and not necessary for operation within 125 °C ambient at rated current.