Texas Instruments SN74CB3T3384PWR

Overview

SN74CB3T3384PWR from Texas Instruments is a 10-bit bidirectional FET bus switch with voltage-level translation capability, supporting mixed-mode signaling across 5-V, 3.3-V, and 2.5-V logic domains. It features 5 Ω typical ON-state resistance, 0.25 ns max propagation delay at 3.3 V, and operates from 2.3 V to 3.6 V VCC - enabling use in memory interleaving and low-power portable equipment.

For engineers reviewing the SN74CB3T3384PWR datasheet, SN74CB3T3384PWR pinout, SN74CB3T3384PWR application, or SN74CB3T3384PWR equivalent, key selection criteria include bidirectional level translation performance, Ioff partial-power-down support, 5-pF OFF-state I/O capacitance, and TSSOP-24 package compatibility with high-density PCB layouts.

Technical Context

The SN74CB3T3384PWR implements two independent 5-bit FET bus switches controlled by separate OE inputs (1OE, 2OE), enabling flexible configuration as either dual 5-bit or single 10-bit switches. Each switch provides near-zero propagation delay via low-ron FET architecture and supports bidirectional data flow without direction control pins.

Voltage translation tracks VCC: input levels up to 5 V are translated to ~VCC output levels (e.g., 5-V input → 3.3-V output with 3.3-V VCC), while maintaining 5-V-tolerant I/Os regardless of power state. The device includes undershoot clamp diodes on all data/control inputs and meets JESD 17 latch-up (>250 mA) and JESD 22 ESD (2000-V HBM, 1000-V CDM) requirements.

Key Specifications

Pinout & Package

TSSOP-24 package (PW), 7.9 mm × 4.5 mm × 1.2 mm height, lead pitch 0.65 mm, RoHS-compliant NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3384PWR and SN74LVC1G3157DCKR, the SN74CB3T3384PWR uniquely combines 10-bit bidirectional translation, Ioff-enabled partial-power-down, and 2.3–3.6 V VCC flexibility - making it irreplaceable in mixed-voltage, high-reliability embedded systems where bus integrity and power sequencing matter.

Availability

SN74CB3T3384PWR is available at Aetrix Electronics and suitable for memory interleaving, low-power portable equipment, industrial PLC backplanes, and test equipment signal routing requiring stable component supply and long-term lifecycle support.

Supply support for SN74CB3T3384PWR 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 company specializing in analog, embedded processing, and logic solutions, with over 50 years of leadership in interface and signal-path innovation.

The SN74CB3T3384PWR belongs to TI's CB3T family of advanced bus switches, designed specifically for high-speed, low-power, mixed-voltage system interconnects in portable, industrial, and communications equipment.

FAQ

What voltage levels can the SN74CB3T3384PWR translate between?

The SN74CB3T3384PWR translates bidirectionally between 0 V to 5.5 V input signals and output levels that track VCC - e.g., with 2.5-V VCC, it converts 5-V or 3.3-V inputs to ~2.5-V outputs; with 3.3-V VCC, it delivers ~3.3-V outputs. This supports interoperability across TTL, LVTTL, and CMOS logic families without external components. The SN74CB3T3384PWR maintains 5-V tolerance on all I/Os regardless of VCC state.

Does the SN74CB3T3384PWR support partial power-down operation?

Yes, the SN74CB3T3384PWR includes Ioff circuitry that disables current paths when VCC = 0 V, preventing damaging backflow current from live I/Os into an unpowered device. This feature is validated per JEDEC standards and enables safe operation in hot-swap and multi-rail systems. The SN74CB3T3384PWR maintains high-impedance isolation between A and B ports during power-off, protecting downstream circuitry.

What is the maximum data rate supported by the SN74CB3T3384PWR?

The SN74CB3T3384PWR supports data rates exceeding 1 GHz, based on its 0.25 ns maximum propagation delay (tpd) at 3.3 V and 5 pF OFF-state I/O capacitance. Real-world performance depends on load capacitance and drive strength, but the device is routinely used in DDR memory interfaces and high-speed test equipment where sub-nanosecond timing margins are critical. The SN74CB3T3384PWR achieves this without direction control logic or added latency.

Can the SN74CB3T3384PWR be used as a 10-bit switch or only as two 5-bit switches?

The SN74CB3T3384PWR is architecturally configured as two independent 5-bit bus switches (1A/1B and 2A/2B groups), each controlled by its own OE pin (1OE and 2OE). It can operate flexibly as either two 5-bit switches or, with both OEs tied together, as a unified 10-bit switch. This dual-mode capability is explicitly defined in the function table and logic diagram of the SN74CB3T3384PWR datasheet.

What package type and footprint does the SN74CB3T3384PWR use?

The SN74CB3T3384PWR uses a TSSOP-24 (PW) package: 7.9 mm × 4.5 mm body, 1.2 mm max height, 0.65 mm lead pitch, with pin 1 in quadrant Q1 per tape-and-reel orientation. It requires a non-solder-mask-defined (NSMD) land pattern per TI's recommended board layout, with 0.45 mm stencil aperture width for reliable 0.125 mm-thick paste deposition. The SN74CB3T3384PWR is RoHS-compliant with NIPDAU finish and MSL Level-1 rating.