Texas Instruments SN74CBTS3384DBRE4

Overview

SN74CBTS3384DBRE4 from Texas Instruments is a 10-bit FET bus switch with Schottky diode clamping, designed for high-speed TTL-compatible signal routing in backplane and memory interface applications. It features 5-Ω on-state resistance, 0.25 ns propagation delay at 5 V, dual independent 5-bit channels, and operates from –40°C to 85°C with 4–5.5 V supply.

For engineers reviewing the SN74CBTS3384DBRE4 datasheet, SN74CBTS3384DBRE4 pinout, SN74CBTS3384DBRE4 application, or SN74CBTS3384DBRE4 equivalent, this page delivers verified electrical specs, package mapping to SSOP-24 (DB), functional behavior under OE control, and real-world use cases in hot-swap and level-translating data paths.

Technical Context

The SN74CBTS3384DBRE4 implements two independent 5-bit FET-based analog switches controlled by separate OE inputs, enabling selective isolation of A-to-B bidirectional signal paths. Each channel exhibits low on-resistance (5–7 Ω) and minimal charge injection, supporting TTL-level logic compatibility without translation circuitry.

Its integrated Schottky clamps protect I/Os against undershoot transients down to –0.6 V, while the 6.5 pF off-state capacitance ensures low crosstalk in high-density PCB layouts. The device functions as a passive, voltage-controlled transmission gate - not a logic gate - with no internal latching or buffering.

Key Specifications

Pinout & Package

SN74CBTS3384DBRE4 is packaged in a 24-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, 7.9 mm × 4.5 mm body size, and 1.2 mm max height. This DB package variant is RoHS-compliant, moisture sensitivity level 1, and rated for reflow up to 260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3384DBR and SN74LVC1G3157DCKR, the SN74CBTS3384DBRE4 uniquely combines dual 5-bit channels, Schottky clamping, and sub-nanosecond timing - making it irreplaceable for high-reliability, hot-pluggable parallel bus architectures.

Availability

SN74CBTS3384DBRE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystem isolation, and test access multiplexing requiring stable component supply across extended product lifecycles.

Supply support for SN74CBTS3384DBRE4 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 90 years of innovation in industrial, automotive, and communications markets.

The SN74CBTS3384DBRE4 belongs to TI's CBTS (CMOS Bus Transceiver Switch) family, engineered specifically for low-latency, high-fidelity signal routing in legacy and mixed-voltage digital systems where passive switching and transient resilience are critical.

FAQ

What is the maximum continuous current rating per channel for SN74CBTS3384DBRE4?

The SN74CBTS3384DBRE4 supports a continuous channel current of 128 mA per switch path, as specified in its absolute maximum ratings. This rating applies to each individual A–B connection (e.g., 1A1 to 1B1), not the total device. Exceeding this limit risks thermal overstress or parametric shift. For sustained operation, design margins should keep peak current below 100 mA per path, especially at elevated ambient temperatures.

Does SN74CBTS3384DBRE4 support level shifting between different supply voltages?

No, the SN74CBTS3384DBRE4 does not perform active level shifting. It is a passive FET switch operating from a single VCC rail (4–5.5 V). While it can pass signals between systems sharing a common ground - such as 3.3-V logic driving into a 5-V bus - it cannot translate voltage levels or isolate ground domains. Its TTL-compatible inputs allow direct interfacing, but voltage translation requires external circuitry or dedicated level translators.

How does the Schottky clamping in SN74CBTS3384DBRE4 improve system reliability?

The integrated Schottky diodes on all I/O pins of SN74CBTS3384DBRE4 clamp negative transients to –0.6 V (A/B) or –1.2 V (controls), preventing undershoot that could forward-bias substrate junctions or trigger latch-up in connected ICs. This eliminates the need for discrete clamping diodes in hot-swap or cable-connected applications, reducing BOM count and PCB area while improving ESD robustness and signal integrity during dynamic insertion events.

Can SN74CBTS3384DBRE4 be used in place of SN74CBT3384DBR?

SN74CBTS3384DBRE4 is pin-compatible and electrically interchangeable with SN74CBT3384DBR in most static routing applications, but it adds Schottky clamping diodes absent in the CBT variant. If undershoot protection is required - for example, in hot-plug or long-trace environments - SN74CBTS3384DBRE4 is the preferred choice. In benign, fixed-installation systems, SN74CBT3384DBR may be substituted, but validation of transient immunity is essential before replacement.

What is the thermal performance of SN74CBTS3384DBRE4 in the SSOP-24 (DB) package?

The SN74CBTS3384DBRE4 in the SSOP-24 (DB) package has a junction-to-ambient thermal impedance (θJA) of 63°C/W, as measured per JESD 51-7. At full 128 mA per channel and 5.5 V VCC, worst-case power dissipation is ~0.7 W. With 63°C/W, this yields ~44°C junction-to-ambient rise above ambient - well within safe limits for industrial operation up to +85°C ambient, provided adequate PCB copper area is used for heat spreading.