Texas Instruments SN74CBTLV3383PWR

Overview

SN74CBTLV3383 from Texas Instruments is a low-voltage 10-bit FET bus-exchange switch operating from 2.3 V to 3.6 V, featuring 5 Ω typical on-state resistance, rail-to-rail signal switching, and I_off partial-power-down protection. It functions as either a 10-bit bus switch or a 5-bit bus exchanger (A/B pair swapping), enabling dynamic signal path reconfiguration in high-speed digital interconnects such as rack server backplanes.

For engineers reviewing the SN74CBTLV3383 datasheet, SN74CBTLV3383 pinout, SN74CBTLV3383 application, or SN74CBTLV3383 equivalent, key selection criteria include its bidirectional 128 mA per-channel current rating, sub-0.25 ns propagation delay at 3.3 V, 200 MHz maximum tested frequency, and TSSOP-24 package compatibility with space-constrained communication board layouts.

Technical Context

The SN74CBTLV3383 implements ten independent FET-based transmission gates controlled by two logic inputs: BE (active-low enable) and BX (bus-exchange select). When BE is low, the device routes signals between A- and B-side I/O pairs; when BX is high, it swaps corresponding A1↔B2, A2↔B1 pairs across five dual channels.

Its I_off specification guarantees <10 µA leakage when V_CC = 0 V and I/O voltages range from 0 to 3.6 V, ensuring isolation and preventing backflow during partial power-down - critical for hot-swap-capable rack servers and gaming platform power sequencing.

Key Specifications

Pinout & Package

TSSOP-24 package (PW), 7.80 mm × 4.40 mm body size, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1 (unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV3383, SN74CBTLV3384PWR removes bus-exchange capability but retains identical performance for static routing, while PI3CHD3245ZMEX extends supply and ESD margins at the cost of larger TSSOP-24 footprint and different control logic polarity.

Availability

SN74CBTLV3383PWR is available at Aetrix Electronics and suitable for rack server backplanes, gaming console I/O subsystems, and communication board signal arbitration requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TSSOP packaging.

Supply support for SN74CBTLV3383PWR 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in high-reliability electronic components.

The SN74CBTLV3383 belongs to TI's CBTLV (low-voltage BiCMOS logic) bus-switch family, designed specifically for high-speed, low-distortion signal routing in next-generation computing and communications infrastructure.

FAQ

What is the maximum operating frequency supported by the SN74CBTLV3383?

The SN74CBTLV3383 has been tested up to 200 MHz in typical applications. Its sub-0.25 ns propagation delay and 5 Ω on-resistance ensure minimal signal degradation at this frequency, making it suitable for PCIe Gen1/Gen2 sideband, DDR clock forwarding, and high-speed serial link multiplexing where jitter accumulation must be minimized. Performance remains stable across the full –40 °C to +85 °C temperature range.

Does the SN74CBTLV3383 require external pull-up resistors on its control pins?

Yes - the BE pin of the SN74CBTLV3383 must be tied to V_CC through an external pull-up resistor to ensure high-impedance state during power-up or brownout conditions. TI recommends a resistor value determined by the driver's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ. The BX pin may be driven directly but benefits from clean, low-noise logic sources to avoid unintended bus-exchange activation.

Can the SN74CBTLV3383 interface with 5-V logic systems?

No - the SN74CBTLV3383 is rated for absolute maximum input voltage of 4.6 V and operates only from 2.3 V to 3.6 V. While its I/O pins are overvoltage tolerant up to 4.6 V, sustained 5 V signaling violates absolute maximum ratings and risks permanent damage. For 5 V systems, consider TI's SN74CBT3383 or Diodes Inc.'s PI3CHD3245ZMEX, which support wider supply ranges.

How does the I_off feature of the SN74CBTLV3383 protect downstream circuitry?

The I_off feature of the SN74CBTLV3383 limits leakage current to less than 10 µA when V_CC = 0 V and I/O pins are biased between 0 V and 3.6 V. This prevents damaging back-current flow from powered sections into unpowered domains - a critical safeguard during hot-swap operations in rack servers or modular gaming platforms where partial power-down is routine. The device maintains full signal isolation without requiring external blocking components.

What is the thermal resistance (R_θJA) of the SN74CBTLV3383PWR in its TSSOP package?

The SN74CBTLV3383PWR in TSSOP-24 (PW) package has a junction-to-ambient thermal resistance (R_θJA) of 90.1 °C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad with two vias; actual thermal performance improves significantly with enhanced PCB copper area and thermal vias. For continuous 128 mA per-channel operation, junction temperature rise remains within safe limits up to +85 °C ambient when layout guidelines are followed.