Texas Instruments SN74CB3Q3384DWR

Overview

SN74CB3Q3384DWR from Texas Instruments is a 10-bit FET bus switch optimized for high-bandwidth signal routing in 2.5-V/3.3-V systems, featuring 3 Ω typical ON-state resistance, 500-MHz bandwidth support, and 5-V-tolerant I/Os with rail-to-rail switching - deployed in PCI interface isolation and memory interleaving applications.

For engineers reviewing the SN74CB3Q3384DWR datasheet, SN74CB3Q3384DWR pinout, SN74CB3Q3384DWR application, or SN74CB3Q3384DWR equivalent, key selection criteria include VCC operating range (2.3–3.6 V), Ioff partial-power-down capability, low 4-pF OFF-state I/O capacitance, and bidirectional 0- to 5-V signaling compatibility.

Technical Context

The SN74CB3Q3384DWR implements two independent 5-bit FET bus switches with separate 1OE and 2OE controls, enabling flexible configuration as either dual 5-bit or single 10-bit switch. Its charge-pump-enhanced gate drive ensures flat r_on across input voltage (0–5 V) and supply (2.5 V/3.3 V) conditions.

It supports true bidirectional data flow with near-zero propagation delay (0.09–0.15 ns), 20-MHz maximum OE switching frequency, and robust isolation during power-down via Ioff circuitry that blocks backflow current when VCC = 0 V.

Key Specifications

Pinout & Package

SN74CB3Q3384DWR is packaged in a 24-pin TSSOP (PW) with 0.65-mm pitch, 7.9-mm × 4.5-mm body, and 1.2-mm max height - compatible with standard surface-mount assembly and IPC-7351 land patterns.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CB3Q3384DWR, SN74CB3Q3244PWR offers reduced channel count but identical performance per bit, while SN74CBT3384PWR trades bandwidth and r_on flatness for legacy compatibility and lower unit cost - neither is pin-compatible, requiring PCB redesign.

Availability

SN74CB3Q3384DWR is available at Aetrix Electronics and suitable for PCI interface isolation, memory interleaving, and low-distortion signal gating requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74CB3Q3384DWR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and power efficiency.

The SN74CB3Q3384DWR belongs to TI's CB3Q high-bandwidth FET bus switch product line, engineered for low-latency, low-distortion signal routing in broadband communications, networking infrastructure, and data-intensive computing systems.

FAQ

What is the maximum operating frequency supported by the SN74CB3Q3384DWR?

The SN74CB3Q3384DWR supports up to 500 MHz bandwidth on its data path, verified under typical conditions with 3.3-V VCC and matched 50-Ω loads. This high-frequency capability stems from its low 3-Ω r_on and 4-pF C_io(OFF), making SN74CB3Q3384DWR suitable for PCI Express Gen 1 and DDR2 memory clock distribution where signal integrity is critical.

Does the SN74CB3Q3384DWR support partial power-down operation?

Yes, the SN74CB3Q3384DWR includes Ioff circuitry that limits reverse current to 1 µA maximum when VCC = 0 V, enabling safe partial-power-down operation. This feature ensures SN74CB3Q3384DWR remains isolated and non-disruptive to other powered sections of the system - essential for hot-swap and modular power architecture designs.

Can the SN74CB3Q3384DWR interface between 3.3-V and 5-V logic domains?

Yes, the SN74CB3Q3384DWR supports 0–5.5-V signaling on all I/O ports regardless of VCC state (2.3–3.6 V), enabling seamless 3.3-V-to-5-V translation without external level shifters. This 5-V tolerance applies whether SN74CB3Q3384DWR is powered or unpowered, protecting downstream components during brownout scenarios.

What is the typical ON-state resistance of the SN74CB3Q3384DWR and how does it vary?

The SN74CB3Q3384DWR has a typical ON-state resistance (r_on) of 3 Ω, measured at VCC = 3.3 V, VI/O = 0 V, and IO = ±30 mA. Crucially, r_on remains flat across the full 0–5-V input range due to its integrated charge pump - ensuring consistent signal amplitude and minimal distortion for SN74CB3Q3384DWR in high-speed analog or digital applications.

Is the SN74CB3Q3384DWR pin-compatible with earlier TI bus switches like the SN74CBT3384?

No, the SN74CB3Q3384DWR is not pin-compatible with SN74CBT3384 despite sharing the same 24-pin TSSOP package and functional block diagram. Differences in internal charge-pump circuitry and optimized I/O structure require validation of layout and timing margins; SN74CB3Q3384DWR must be treated as a distinct design-in component rather than a drop-in replacement.