Texas Instruments SN74CBT3383DBQR

Overview

SN74CBT3383DBQR from Texas Instruments is a 10-bit TTL-compatible bus-exchange switch in 24-pin SSOP package, featuring 5 Ω typical on-state resistance, <1 ns propagation delay, bidirectional signal flow, and dual-mode operation (bus switch or 5-bit nibble swap) for high-speed data routing in enterprise server backplanes.

For engineers reviewing the SN74CBT3383DBQR datasheet, SN74CBT3383DBQR pinout, SN74CBT3383DBQR application, or SN74CBT3383DBQR equivalent, key selection criteria include its 4.5–5.5 V supply range, 200 MHz bandwidth capability, low 6 pF off-state capacitance, and active-low BE / active-high BX control logic for deterministic bus topology reconfiguration.

Technical Context

The SN74CBT3383DBQR implements a CMOS-based analog bus switch architecture with no internal level-shifting or buffering-signals pass through with near-zero added delay. Its functional modes are fully determined by two digital control inputs: BE (active-low enable) and BX (active-high exchange select), enabling either direct A↔B passthrough or crossed A1↔B2/A2↔B1 mapping per 2-bit pair.

All 10 channels operate simultaneously and independently under identical electrical conditions: r_ON remains flat across input voltage (0–5 V) and temperature (0–70 °C), and channel-to-channel skew is minimized by matched layout and symmetric I/O structure. No power sequencing or biasing is required beyond standard 5-V decoupling.

Key Specifications

Pinout & Package

SN74CBT3383DBQR uses a 24-pin SSOP (DBQ) package measuring 8.65 mm × 3.90 mm × 1.2 mm max height, with gull-wing leads, RoHS-compliant NiPdAu finish, and moisture sensitivity level MSL-2 (260 °C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTD3383DBQR and SN74LVC1G3157DCKR, the SN74CBT3383DBQR uniquely combines synchronized 10-bit control, true bidirectional zero-delay operation, and 5-V native compatibility-making it irreplaceable for deterministic bus topology management in server and networking hardware.

Availability

SN74CBT3383DBQR is available at Aetrix Electronics and suitable for enterprise servers, Ethernet switches, and industrial PCs requiring stable component supply with guaranteed long-term sourcing and full traceability.

Supply support for SN74CBT3383DBQR 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 technologies, with over 50 years of innovation in high-reliability interface solutions.

The SN74CBT3383DBQR belongs to TI's CBT (Crosspoint Bus Technology) family, engineered specifically for low-latency, high-fidelity bus switching in mission-critical communications infrastructure where signal integrity and deterministic timing are non-negotiable.

FAQ

What is the maximum operating frequency supported by the SN74CBT3383DBQR?

The SN74CBT3383DBQR is characterized for reliable operation up to 200 MHz, as confirmed by TI's switching characteristics testing with 50 pF load. This performance holds across the full 4.5–5.5 V supply range and 0–70 °C temperature range. Layout-dependent parasitics may reduce practical bandwidth, so adherence to TI's recommended trace length and decoupling guidelines is essential to achieve the rated frequency in production designs using SN74CBT3383DBQR.

Does the SN74CBT3383DBQR require external pull-up or pull-down resistors on its control pins?

No, the SN74CBT3383DBQR does not require external biasing on BE or BX control inputs. Its VIH (2.0 V min) and VIL (0.8 V max) thresholds are designed for direct interfacing with standard 5-V TTL or 3.3-V CMOS outputs. TI specifies that control inputs may be driven actively high or low without resistive termination-provided source impedance remains ≤500 Ω to meet timing requirements. This simplifies PCB design and reduces component count in systems using SN74CBT3383DBQR.

Can the SN74CBT3383DBQR be used in hot-swap applications?

Yes, the SN74CBT3383DBQR supports hot-swap operation when used with proper power sequencing: VCC must be stable before asserting BE low, and BE must be returned high before VCC ramp-down. Its ±3000 V HBM ESD rating and low 6 pF off-state capacitance minimize transient coupling during insertion. However, TI recommends adding series current-limiting resistors (≤10 Ω) on I/O lines in live-backplane environments to suppress inrush-verified in reference designs for SN74CBT3383DBQR-based server midplanes.

How does the bus-exchange function of the SN74CBT3383DBQR differ from standard multiplexing?

The bus-exchange function in SN74CBT3383DBQR is a synchronized, hardware-defined nibble swap-not software-configurable multiplexing. When BX = high and BE = low, all five 2-bit pairs (1A1/1B1 through 5A2/5B2) simultaneously cross-connect: 1A1 ↔ 1B2, 1A2 ↔ 1B1, etc. This enables atomic byte-level bus reordering without timing skew between lanes-unlike discrete 2:1 muxes which require independent enable control and introduce channel-to-channel delay variation. The feature is intrinsic to SN74CBT3383DBQR's silicon architecture.

What is the thermal performance of the SN74CBT3383DBQR in its SSOP (DBQ) package?

In its 24-pin SSOP (DBQ) package, the SN74CBT3383DBQR has a junction-to-ambient thermal resistance (R_θJA) of 61.0 °C/W, measured under JEDEC JESD51-2 conditions. At maximum rated ICC (50 µA) and worst-case r_ON (7 Ω), total power dissipation remains below 15 mW-resulting in negligible self-heating (<1 °C rise) even in sealed enclosures. No heatsinking is required for SN74CBT3383DBQR in standard commercial airflow environments.