Texas Instruments SN74CBTS3384DBLE

Overview

SN74CBTS3384DBLE from Texas Instruments is a 10-bit FET bus switch with Schottky diode clamping, designed for high-speed TTL-compatible signal routing in digital backplanes and memory interfaces. It features 5-Ω on-state resistance, 0.25 ns propagation delay at 5 V, and dual independent 5-bit channels controlled by separate OE inputs. Used in hot-swap-capable data paths where undershoot protection and minimal insertion delay are critical.

For engineers reviewing the SN74CBTS3384DBLE datasheet, SN74CBTS3384DBLE pinout, SN74CBTS3384DBLE application, or SN74CBTS3384DBLE equivalent, this page delivers verified electrical specs, package mapping to SSOP-24 (DB), functional behavior under TTL-level control, thermal performance (θ_JA = 63°C/W), and real-world use cases in bus isolation and level-flexible I/O expansion.

Technical Context

The SN74CBTS3384DBLE implements two independent 5-bit bidirectional FET switches, each with TTL-compatible enable logic and integrated Schottky clamps on all A/B I/Os to suppress negative undershoot down to –0.6 V. Its low R_ON (5–7 Ω typical) ensures sub-nanosecond signal integrity across 50-pF loads.

Operation requires V_CC between 4 V and 5.5 V; control inputs accept VIH ≥ 2 V and VIL ≤ 0.8 V. When OE is low, the corresponding 5-bit path conducts bidirectionally; when high, both ports enter high-Z state. No internal pull-ups or level-shifting circuitry is present - it is a passive analog switch core with digital enable gating.

Key Specifications

Pinout & Package

SN74CBTS3384DBLE is housed in a 24-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch, 7.7-mm body width, and 1.2-mm max height. The DB package is RoHS-compliant, moisture-sensitive Level-1, and rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3384DBR and SN74CBTD3384PWR, the SN74CBTS3384DBLE delivers the lowest on-resistance and fastest propagation delay in its class, making it optimal for high-speed, same-voltage bus isolation where minimal signal distortion is mandatory - but lacks built-in level shifting, requiring external translation if interfacing mismatched logic families.

Availability

SN74CBTS3384DBLE is available at Aetrix Electronics and suitable for memory expansion interfaces, hot-swap backplane isolation, and low-power I/O multiplexing requiring stable component supply and long-term obsolescence management.

Supply support for SN74CBTS3384DBLE 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 industrial, automotive, and communications markets.

The SN74CBTS3384DBLE belongs to TI's CBTS-series bus switches - engineered for high-speed, low-distortion signal routing in legacy and mixed-voltage digital systems where reliability under transient stress and precise timing control are essential.

FAQ

What is the maximum operating voltage for SN74CBTS3384DBLE?

The SN74CBTS3384DBLE supports a supply voltage range of 4 V to 5.5 V per recommended operating conditions. Its absolute maximum V_CC rating is 7 V, but sustained operation above 5.5 V risks parametric deviation and reduced reliability. All I/O pins tolerate –0.5 V to 7 V, enabling robustness against transient undershoot and overshoot, as confirmed in the SCDS024M datasheet Section 6.1.

Does SN74CBTS3384DBLE support bidirectional signal flow?

Yes, the SN74CBTS3384DBLE supports fully bidirectional signal flow on all ten switched channels. Each A/B pair (e.g., 1A1 ↔ 1B1) functions as a passive analog path with no intrinsic directionality - signal direction is determined solely by the driving source on either side. This behavior is explicitly defined in the Function Table and Logic Diagram of the SN74CBTS3384DBLE datasheet.

Can SN74CBTS3384DBLE be used with 3.3-V control signals?

No - SN74CBTS3384DBLE requires TTL-compatible control inputs: V_IL ≤ 0.8 V and V_IH ≥ 2 V at V_CC = 4–5.5 V. A 3.3-V logic high may fall below the guaranteed VIH threshold, risking incomplete enable/disable transitions. For 3.3-V systems, TI recommends SN74CBTD3384PWR or external level translation, as documented in the SN74CBTS3384DBLE Electrical Characteristics table.

What thermal derating applies to SN74CBTS3384DBLE in SSOP-24 (DB) package?

The SN74CBTS3384DBLE in DB package has a junction-to-ambient thermal resistance (θ_JA) of 63°C/W. At 25°C ambient and full 128-mA channel current, junction temperature rise is ~8.06°C - well within the –40°C to +85°C operating range. Derating begins above 70°C ambient per TI's thermal guidelines in the SCDS024M datasheet Section 6.3.

Is SN74CBTS3384DBLE pin-compatible with other CBTS-series devices?

SN74CBTS3384DBLE shares identical pinout and function with SN74CBT3384DBR and SN74CBTS3384DBQR (same DB/DBQ footprints), but is not compatible with DW, PW, or DGV variants due to differing package dimensions and land patterns. Pin compatibility is confirmed by TI's package drawings and the top-view pin diagram in the SCDS024M datasheet Figure 1.