Texas Instruments SN74CBTLV3383DW

Overview

SN74CBTLV3383DW from Texas Instruments is a low-voltage 10-bit FET bus-exchange switch in SOIC-24 package, featuring 5-Ω typical on-state resistance, rail-to-rail signal switching (0 V to VCC), and Ioff partial-power-down protection. It operates from 2.3 V to 3.6 V and supports bidirectional data flow in high-speed memory or processor interconnects.

For engineers reviewing the SN74CBTLV3383DW datasheet, SN74CBTLV3383DW pinout, SN74CBTLV3383DW application, or SN74CBTLV3383DW equivalent, this page delivers verified electrical specs, functional mode behavior, real-world use cases in rack servers and communication boards, and validated alternative options for bus-switching designs requiring sub-nanosecond propagation delay and power-off isolation.

Technical Context

The SN74CBTLV3383DW implements ten independent FET switches configured as five A/B signal pairs, with dual control inputs: BE (active-low enable) and BX (bus-exchange select). When BE is low and BX is low, A1–A5 connect to B1–B5 respectively; when BX is high, A1–A5 swap to B2–B1, A2–A5 to B1–B4 - enabling dynamic signal path reconfiguration without external logic.

Its Ioff specification guarantees ≤10 µA leakage when VCC = 0 V and I/O pins range from 0 to 3.6 V, ensuring robust isolation during partial power-down. Rail-to-rail operation supports full-swing digital signals across the entire supply range, and propagation delay remains ≤0.25 ns (typ.) at 2.5 V with 50-pF load - critical for DDR, PCIe, and high-speed parallel bus applications.

Key Specifications

Pinout & Package

SN74CBTLV3383DW uses a 24-pin SOIC (DW) package measuring 15.4 mm × 7.50 mm, with standard 1.27-mm lead pitch and gull-wing leads. Pin 1 is located at the top-left corner adjacent to the index notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV3383DW, SN74CBT3383CDW offers wider voltage range but sacrifices Ioff isolation and adds propagation delay; TS3USB30EVM provides superior USB compliance but lacks the programmable A/B swapping logic and general-purpose bidirectional flexibility required for memory or processor interconnects.

Availability

SN74CBTLV3383DW is available at Aetrix Electronics and suitable for rack server DIMM interfaces, gaming console memory subsystems, and communication board signal routing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74CBTLV3383DW 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity solutions, with over 50 years of innovation in high-performance logic and interface ICs.

The SN74CBTLV3383DW belongs to TI's CBTLV (low-voltage BiCMOS logic) family, designed specifically for high-speed, low-power bus switching in memory, processor, and communications infrastructure where minimal propagation delay and robust power-down behavior are critical.

FAQ

What is the maximum continuous current per channel for the SN74CBTLV3383DW?

The SN74CBTLV3383DW supports up to ±128 mA continuous channel current per switch, as specified in Absolute Maximum Ratings. This rating applies across the full operating temperature range (–40 °C to +85 °C) and ensures reliable conduction without thermal derating under typical PCB copper pour conditions. Exceeding this limit risks permanent device degradation.

Does the SN74CBTLV3383DW support true bidirectional signal flow?

Yes, the SN74CBTLV3383DW supports fully symmetrical bidirectional operation: each FET switch conducts equally well from A-to-B or B-to-A with matched on-resistance, capacitance, and propagation delay. This is confirmed in the Functional Description section and validated by identical electrical characteristics tables for both directions in the datasheet.

How does the Ioff feature function in the SN74CBTLV3383DW during power-down?

The Ioff feature in the SN74CBTLV3383DW limits leakage current to ≤10 µA when VCC = 0 V and any I/O pin is biased between 0 V and 3.6 V. This prevents damaging back-current flow through powered-down sections of the system, enabling safe partial-power-down operation in multi-rail architectures without external isolation circuitry.

Can the SN74CBTLV3383DW operate at 2.5 V supply voltage?

Yes, the SN74CBTLV3383DW is fully specified for operation at 2.5 V: Recommended Operating Conditions list VCC = 2.3 V to 3.6 V, and Electrical Characteristics include r(on) = 5 Ω typ. and tpd = 0.15–0.25 ns at VCC = 2.5 V. All timing and DC parameters remain guaranteed within this range.

What is the purpose of the BX and BE pins on the SN74CBTLV3383DW?

The BE (pin 1) is an active-low enable that disables all ten switches when high; the BX (pin 13) selects bus-exchange mode when high (swapping A1↔B2, A2↔B1, etc.) or straight-through mode when low. Together, they provide deterministic, glitch-free signal path control - essential for synchronous memory and processor interconnects requiring precise timing alignment.