Nexperia USA Inc. 74CBTLV3126DS,118

Overview

74CBTLV3126DS,118 from Nexperia is a 4-bit high-speed bus switch IC with independent output enable inputs (1OE–4OE), rail-to-rail switching on A/B I/O ports, 5 Ω typical ON-resistance at 3.3 V, 0.2 ns propagation delay, and IOFF partial power-down protection. It operates from 2.3 V to 3.6 V and supports industrial temperature range (−40 °C to +125 °C) in SSOP16 package - used for hot-swap signal routing in FPGA I/O expansion and low-voltage memory interface isolation.

For engineers reviewing the 74CBTLV3126DS,118 datasheet, 74CBTLV3126DS,118 pinout, 74CBTLV3126DS,118 application, or 74CBTLV3126DS,118 equivalent, key selection criteria include guaranteed sub-0.3 ns tpd across full VCC range, Schmitt-triggered OE inputs tolerant of slow edges, IOFF-enabled backflow prevention during power sequencing, and verified 406 MHz −3 dB bandwidth in ON-state.

Technical Context

This device implements four independent bilateral analog switches controlled by dedicated OE pins, each with CMOS transmission-gate topology enabling bidirectional signal flow between A and B ports. The IOFF circuit actively disables all switches when VCC = 0 V, blocking current paths to prevent damage during partial power-down sequences.

Each switch features Schmitt-trigger input logic on its OE pin, ensuring clean enable/disable transitions even with slow-rising control signals across the full 2.3–3.6 V supply range. The 5 Ω typical RON and <15 pF ON-state capacitance support high-fidelity signal integrity for data rates up to 400 Mbps in point-to-point digital interconnects.

Key Specifications

Pinout & Package

74CBTLV3126DS,118 is housed in a plastic shrink small outline package (SSOP16), SOT519-1, with 16 leads, 3.9 mm body width, and 0.635 mm lead pitch. Pin 1 is index-marked; pins 1 and 9 are no-connect (n.c.).

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, the 74CBTLV3126DS,118 uniquely delivers four independent, high-speed, rail-to-rail channels in a standard '126' pinout with proven IOFF behavior - making it optimal for multi-lane isolation where timing consistency, channel independence, and power sequencing safety are critical.

Availability

74CBTLV3126DS,118 is available at Aetrix Electronics and suitable for PCIe lane multiplexing, FPGA I/O expansion, memory interface isolation, and hot-swap backplane interconnect requiring stable component supply across extended temperature operation.

Supply support for 74CBTLV3126DS,118 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, analog, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in high-volume applications.

The 74CBTLV3126 belongs to Nexperia's advanced bus switch product line, engineered specifically for low-latency, low-power signal routing in mixed-voltage digital systems with stringent power sequencing requirements.

FAQ

What is the maximum recommended operating voltage for 74CBTLV3126DS,118?

The absolute maximum supply voltage is +4.6 V, but the recommended operating range is strictly 2.3 V to 3.6 V per JEDEC standards JESD8-5 and JESD8-B. Operation above 3.6 V risks exceeding static characteristics limits, degrading RON stability and increasing leakage beyond datasheet guarantees. For 5 V systems, level-shifting circuitry must be used upstream.

Does 74CBTLV3126DS,118 support true bidirectional signal flow?

Yes - each of the four switch channels is fully bidirectional: signals pass equally well from A to B or B to A with identical RON, capacitance, and timing characteristics. This is inherent to its CMOS transmission-gate architecture and confirmed by functional diagrams and test circuits in Figures 2, 3, and 4 of the datasheet.

How should the OE pins be handled during power-up to ensure reliable high-impedance state?

To guarantee OFF-state at power-on, each OE pin must be pulled LOW via an external resistor to GND. Nexperia specifies this pull-down resistor value based on the driver's current-sinking capability - typically 10 kΩ suffices for most microcontroller GPIOs. Leaving OE floating risks metastability and unintended channel activation during VCC ramp.

Can 74CBTLV3126DS,118 be used in automotive applications?

The DS variant is qualified for −40 °C to +125 °C operation and meets AEC-Q100 stress test requirements for temperature cycling and HBM/CDM ESD, but Nexperia does not formally certify it as automotive-grade. For ASIL-B or higher systems, use only parts explicitly marked "AEC-Q100 qualified" in ordering information - consult Nexperia's automotive product selector for validated alternatives.