Nexperia USA Inc. 74CBTLV3126BQ,115

Overview

74CBTLV3126BQ,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, IOFF partial power-down protection, and operation across 2.3 V to 3.6 V supply. It enables bidirectional signal routing in low-latency memory and data-path interconnects, such as DDR interface isolation and FPGA I/O expansion.

For engineers reviewing the 74CBTLV3126BQ,115 datasheet, 74CBTLV3126BQ,115 pinout, 74CBTLV3126BQ,115 application, or 74CBTLV3126BQ,115 equivalent, this page delivers verified functional role, thermal-enhanced DHVQFN14 package details, timing-critical dynamic specs (tpd ≤ 0.31 ns), IOFF leakage behavior, and real-world use context for high-speed digital system design.

Technical Context

This device implements four independent analog-style transmission gates, each controlled by a dedicated Schmitt-trigger-enabled OE input. Each switch supports bidirectional signal flow between A and B ports with no internal direction logic - signal integrity depends solely on external voltage levels and load conditions.

Its IOFF circuitry actively disables outputs and blocks backflow current when VCC = 0 V, enabling hot-swap and partial power-down operation. The DHVQFN14 package (SOT762-1) provides enhanced thermal performance via an exposed die pad, supporting continuous operation up to +125 °C ambient with 9.6 mW/K derating above 98 °C.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV3126PWR and 74LVC1G3157GW,125, the 74CBTLV3126BQ,115 delivers superior thermal performance in compact layouts and guaranteed 4-bit parallel operation - making it optimal for high-density industrial controllers and automotive infotainment head units requiring extended temperature reliability.

Availability

74CBTLV3126BQ,115 is available at Aetrix Electronics and suitable for DDR3 memory isolation, FPGA I/O expansion, hot-swappable module interconnects, and JTAG test access multiplexing requiring stable component supply across industrial temperature ranges.

Supply support for 74CBTLV3126BQ,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 74CBTLV3126 product line targets high-speed digital interconnects where low ON-resistance, rail-to-rail analog switching, and IOFF-enabled power sequencing are essential - specifically engineered for DDR, PCIe, and FPGA-based system architectures.

FAQ

What is the maximum allowable signal voltage on A/B ports when VCC = 0 V?

The absolute maximum switch voltage rating is VCC + 0.5 V, but with VCC = 0 V, the valid range is −0.5 V to +0.5 V per Table 4. Exceeding this risks latch-up or permanent damage. IOFF protection prevents current flow, but voltage excursion beyond limits still violates absolute maximum ratings.

Can 1OE–4OE be tied together and driven by a single controller output?

Yes - all OE inputs are electrically identical and can be paralleled. However, doing so eliminates per-channel gating capability. When tied together, ensure total capacitive load remains within driver strength limits; typical CI per OE is 0.9 pF, so four inputs sum to ~3.6 pF.

Is the exposed thermal pad on the DHVQFN14 package required to be soldered to ground?

No - per datasheet note, the pad has no electrical or mechanical requirement to be soldered. If soldered, it must remain floating or connect to GND. Thermal simulation shows ≥20 % junction-to-ambient improvement when thermally anchored to a 200 mm² copper pour, but not mandatory for +125 °C operation.

Does the 74CBTLV3126BQ,115 support hot-plug detection via OE pin state monitoring?

No - OE inputs lack built-in status feedback or interrupt capability. Hot-plug detection must be implemented externally using voltage supervisors or GPIO monitoring of VCC and OE logic levels. The device only guarantees safe power-down behavior (IOFF), not event reporting.