Texas Instruments SN74CBTD3384CDWRG4

Overview

SN74CBTD3384CDWRG4 from Texas Instruments is a 10-bit TTL-compatible bus switch IC with dual 5-bit independent channels, 5-Ω on-state resistance, level-shifting capability (5-V input to 3.3-V output), and separate output-enable controls for each channel - used in mixed-voltage system interconnects between microcontrollers and peripheral buses.

For engineers reviewing the SN74CBTD3384CDWRG4 datasheet, SN74CBTD3384CDWRG4 pinout, SN74CBTD3384CDWRG4 application, or SN74CBTD3384CDWRG4 equivalent, key selection criteria include on-resistance matching, propagation delay under 0.25 ns, dual OE control timing (ten ≤ 7 ns, tdis ≤ 5.3 ns), and SOIC-DW package thermal performance (θJA = 46°C/W).

Technical Context

The SN74CBTD3384CDWRG4 implements two independent 5-bit bidirectional analog switches with TTL-compatible control inputs and integrated V_CC-clamp diodes enabling 5-V-to-3.3-V level shifting. Each channel features dedicated OE pins (1OE, 2OE) that drive low to enable conduction between A and B ports.

Switch operation is purely resistive with no internal logic latching or voltage translation circuitry - signal integrity relies on low r_on (5 Ω typical) and minimal parasitic capacitance (C_io(OFF) = 3.5 pF). Propagation delay is determined solely by the RC time constant of r_on and load capacitance (CL = 50 pF).

Key Specifications

Pinout & Package

SN74CBTD3384CDWRG4 is packaged in a 24-pin SOIC (DW) body measuring 15.4 mm × 7.5 mm × 2.35 mm (JEDEC MS-013), with gull-wing leads, RoHS-compliant NiPdAu finish, and moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTD3384CDWRG4, SN74CBT3384CDWR lacks built-in level shifting and demands external design overhead, while SN74LVC1G3157DCKR offers smaller footprint but sacrifices bus-width scalability and dual-channel autonomy - making SN74CBTD3384CDWRG4 optimal for multi-bit, mixed-voltage, independently controllable interconnects.

Availability

SN74CBTD3384CDWRG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive infotainment head units, and PCIe slot interconnects requiring stable component supply and long-term lifecycle support.

Supply support for SN74CBTD3384CDWRG4 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 'CBTD3384 family was designed specifically for high-speed, low-latency bus switching in mixed-voltage systems - targeting applications where traditional logic buffers introduce unacceptable propagation delay or level-shifting complexity.

FAQ

What is the maximum continuous current rating per channel for SN74CBTD3384CDWRG4?

The SN74CBTD3384CDWRG4 supports a continuous channel current of 128 mA per switch. This rating applies to any individual A–B path (e.g., 1A1↔1B1) under recommended operating conditions (V_CC = 4.5–5.5 V, T_A = −40°C to 85°C). Exceeding this current may cause thermal derating or permanent damage due to localized heating in the SOIC-DW package.

Does SN74CBTD3384CDWRG4 require external pull-up or pull-down resistors on its OE pins?

No, SN74CBTD3384CDWRG4 does not require external pull-up or pull-down resistors on 1OE or 2OE pins. However, TI's datasheet mandates that all unused control inputs must be held at either V_CC or GND to ensure proper device operation and avoid floating states that could induce shoot-through or increased ICC. Direct connection to supply or ground satisfies this requirement.

Can SN74CBTD3384CDWRG4 be used for bidirectional 3.3-V-to-5-V level shifting?

Yes, SN74CBTD3384CDWRG4 supports bidirectional level shifting, but only from 5-V inputs to 3.3-V outputs - not the reverse. The integrated V_CC-clamp diode enables safe clamping of 5-V signals to ~3.3 V at the B-port outputs. Driving 3.3-V signals into the A-port while powering V_CC at 5 V does not produce 5-V outputs; the device operates as a passive switch with no active up-translation capability.

What is the thermal resistance (θ_JA) of SN74CBTD3384CDWRG4 in its SOIC-DW package?

The SN74CBTD3384CDWRG4 in the SOIC-DW package has a junction-to-ambient thermal resistance (θ_JA) of 46°C/W under standard JEDEC test conditions. This value assumes a 2-layer PCB with 1-in² copper pour and no additional heatsinking. For high-current or high-temperature applications, thermal simulation or empirical measurement is recommended to validate actual junction temperature rise.

Is SN74CBTD3384CDWRG4 pin-compatible with SN74CBT3384CDWR?

Yes, SN74CBTD3384CDWRG4 is pin-compatible with SN74CBT3384CDWR - both use the same 24-pin SOIC-DW package and identical pinout (1OE, 1B1–1B5, 1A1–1A5, GND, V_CC, 2A1–2A5, 2B1–2B5, 2OE). However, functional differences exist: SN74CBTD3384CDWRG4 includes integrated V_CC-clamp diodes for level shifting, whereas SN74CBT3384CDWR does not - requiring external design changes if substituting between them.