Texas Instruments SN74CBTS3384PWLE

Overview

SN74CBTS3384PWLE 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 dual 5-bit independent switches (1A/1B and 2A/2B), 5 Ω typical on-state resistance, <0.35 ns propagation delay at 4 V, and operates from –40°C to 85°C with 4–5.5 V supply.

For engineers reviewing the SN74CBTS3384PWLE datasheet, SN74CBTS3384PWLE pinout, SN74CBTS3384PWLE application, or SN74CBTS3384PWLE equivalent, key selection criteria include bidirectional low-R_ON switching, undershoot protection via integrated Schottky clamps, OE-controlled isolation timing (t_en/t_dis < 6 ns), and TSSOP-24 package compatibility with high-density PCB layouts.

Technical Context

The SN74CBTS3384PWLE implements two independent 5-bit FET-based analog switches controlled by separate OE inputs, enabling selective isolation of A↔B data paths without directionality constraints. Each switch channel exhibits symmetrical conduction with no internal level-shifting circuitry.

Its Schottky diodes are integrated directly at all I/O terminals (A1–A5, B1–B5) to clamp negative undershoot transients below –0.6 V, supporting robust operation in hot-swap and noisy bus environments. The device requires no external biasing and draws only 3 µA quiescent current at 5.5 V.

Key Specifications

Pinout & Package

TSSOP-24 (PW) package: 7.8 mm × 4.4 mm × 1.2 mm body, 0.65 mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3384PW and 74LVC1G3157DCKR, the SN74CBTS3384PWLE uniquely delivers 10-bit bidirectional switching with integrated undershoot protection in a standard TSSOP-24 footprint - essential for industrial memory expansion and backplane interconnect where signal integrity and fault tolerance are co-dependent requirements.

Availability

SN74CBTS3384PWLE is available at Aetrix Electronics and suitable for memory expansion interfaces, backplane signal routing, and legacy peripheral bridging requiring stable component supply and long-term industrial lifecycle support.

Supply support for SN74CBTS3384PWLE 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 decades of experience in high-reliability industrial and automotive IC design.

The SN74CBTS3384PWLE belongs to TI's CBTS-series FET bus switches, engineered specifically for low-latency, bidirectional signal routing in 5-V systems where bus contention, undershoot, and timing predictability are critical.

FAQ

What is the maximum undershoot voltage the SN74CBTS3384PWLE can safely clamp?

The SN74CBTS3384PWLE integrates Schottky diodes that clamp I/O undershoot to –0.6 V at 18 mA, protecting connected devices from negative transients. This specification is verified under V_CC = 4.5 V and applies to all A and B port pins. The SN74CBTS3384PWLE maintains this clamping behavior across its full operating temperature range (–40°C to 85°C), making it suitable for hot-swap applications where connector mating noise is present.

Does the SN74CBTS3384PWLE require external pull-up resistors on its OE inputs?

No, the SN74CBTS3384PWLE does not require external pull-up resistors on its OE inputs. Its TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2 V) allow direct connection to standard 5-V logic outputs. However, TI recommends tying unused OE inputs to V_CC or GND to prevent floating states that could cause unintended switching - a requirement explicitly stated in the SN74CBTS3384PWLE datasheet's recommended operating conditions.

Can the SN74CBTS3384PWLE be used in 3.3-V systems?

The SN74CBTS3384PWLE is specified for V_CC = 4 V to 5.5 V and is not characterized for reliable operation below 4 V. While some users report functional behavior at 3.3 V, TI does not guarantee timing, R_ON, or clamping performance outside the recommended range. For 3.3-V systems, consider the SN74LVC1G3157 or SN74AUC2G66 - devices explicitly rated for 3.3-V operation and documented in TI's LVC/AUC families.

What is the thermal resistance (θ_JA) of the SN74CBTS3384PWLE in its TSSOP-24 package?

The SN74CBTS3384PWLE in the PW (TSSOP-24) package has a junction-to-ambient thermal resistance (θ_JA) of 88°C/W, as measured per JESD 51-7. This value assumes standard JEDEC 2-layer board conditions. Actual thermal performance depends on PCB copper area, airflow, and adjacent heat sources. For continuous 128 mA channel current operation, derating calculations using θ_JA = 88°C/W confirm safe junction temperatures within the –40°C to 85°C ambient range when mounted on typical industrial PCBs.

Is the SN74CBTS3384PWLE pin-compatible with other packages in the same family?

Yes, the SN74CBTS3384PWLE shares identical pinout and functionality with other package variants of the SN74CBTS3384, including DW (SOIC), DBR (SSOP), DBQR (QSOP), and DGVR (TVSOP). All variants use the same 24-pin arrangement with matching 1OE, 2OE, A/B port assignments and power/ground locations. This enables drop-in replacement across packages based on board density, thermal, or assembly requirements - confirmed by TI's official package drawings and function tables.