Texas Instruments SN74CB3Q3244GQNR

Overview

SN74CB3Q3244GQNR from Texas Instruments is a high-bandwidth 8-bit FET bus switch with dual 4-bit independent channels, 4 Ω typical ON-state resistance (ron), rail-to-rail 0–5 V switching at 3.3-V VCC, and 3.5 pF typical OFF-state I/O capacitance. It enables bidirectional signal routing in memory interleaving and differential interface applications requiring minimal propagation delay (0.12 ns) and partial-power-down support via Ioff.

For engineers reviewing the SN74CB3Q3244GQNR datasheet, SN74CB3Q3244GQNR pinout, SN74CB3Q3244GQNR application, or SN74CB3Q3244GQNR equivalent, key selection criteria include its 2.3–3.6 V VCC range, 5-V-tolerant I/Os during power-up/down, flat ron over voltage range, and VFBGA-20 (GQN) package compatibility with high-density PCB layouts.

Technical Context

The SN74CB3Q3244GQNR integrates a charge-pump circuit to elevate the gate voltage of pass transistors, enabling low and flat ON-state resistance across input voltages (0–5 V) and supply voltages (2.3–3.6 V). Its dual 4-bit architecture supports independent channel control via 1OE and 2OE inputs, allowing flexible configuration as two 4-bit switches or one 8-bit switch.

Each FET switch provides near-zero propagation delay (0.12 ns min), bidirectional data flow, and undershoot clamp diodes on control inputs. The device meets JESD 78 Class II latch-up immunity (>100 mA) and JESD 22 ESD ratings (2000-V HBM, 1000-V CDM), ensuring robust operation in mixed-signal environments.

Key Specifications

Pinout & Package

VFBGA-20 package (GQN), 2.5 mm × 3.5 mm footprint, 0.5 mm pitch, bottom-side solder balls, JEDEC MO-194 compliant. Designed for high-density routing and thermal performance (θJA = 78°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CB3Q3244GQNR, SN74CBT3244DBQR trades bandwidth and power-down safety for broader VCC flexibility, while PI3CH400QE adds ESD margin but removes Ioff-making SN74CB3Q3244GQNR optimal for high-speed, hot-pluggable, multi-rail industrial interfaces.

Availability

SN74CB3Q3244GQNR is available at Aetrix Electronics and suitable for memory interleaving, differential signal interface, and bus isolation applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant VFBGA packaging.

Supply support for SN74CB3Q3244GQNR 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 logic solutions, with decades of innovation in high-speed interface and power management ICs.

The SN74CB3Q3244GQNR belongs to TI's CB3Q family of high-bandwidth FET bus switches, engineered specifically for broadband communications, networking infrastructure, and data-intensive computing systems demanding low-latency, low-distortion signal routing.

FAQ

What is the maximum operating frequency supported by the SN74CB3Q3244GQNR?

The SN74CB3Q3244GQNR supports a maximum switching frequency of 20 MHz on its OE inputs under specified load conditions (RL ≥ 1 MΩ, CL = 0). Its 500 MHz bandwidth capability refers to signal path performance-not clocked operation-and is validated by low ron (4 Ω) and minimal Cio(OFF) (3.5 pF), enabling clean pass-through of high-frequency analog or digital waveforms without distortion. SN74CB3Q3244GQNR maintains this performance across its full 0–5 V I/O voltage range.

Does the SN74CB3Q3244GQNR support hot-swap or live-insertion scenarios?

Yes, the SN74CB3Q3244GQNR supports hot-swap operation due to its 5-V-tolerant I/Os during both powered-up and powered-down states, combined with Ioff circuitry that blocks reverse current flow when VCC = 0 V. This allows safe connection to live buses without damaging upstream drivers or downstream loads. SN74CB3Q3244GQNR also features undershoot clamp diodes on control inputs to further enhance robustness in dynamic insertion environments.

Can the SN74CB3Q3244GQNR be used for analog signal switching?

Yes, the SN74CB3Q3244GQNR is explicitly qualified for both digital and analog applications-including low-distortion signal gating-due to its rail-to-rail switching capability (0–5 V), flat ON-state resistance (4 Ω typical), and low OFF-state capacitance (3.5 pF). Its FET-based architecture preserves signal fidelity across audio, video, and sensor signal chains. SN74CB3Q3244GQNR has been deployed in analog multiplexing and DAC output gating where THD and bandwidth are critical.

What is the recommended power-up sequence for the SN74CB3Q3244GQNR?

To ensure high-impedance state during power-up, OE pins (1OE and 2OE) must be held high (i.e., tied to VCC) via pull-up resistors before VCC ramps; the minimum resistor value depends on the driver's current-sinking capability. SN74CB3Q3244GQNR does not require strict VCC ramp ordering relative to I/O signals due to its 5-V-tolerant design, but OE stabilization prior to VCC application prevents unintended channel activation. No external reset circuitry is needed.

Which package variant corresponds to the SN74CB3Q3244GQNR orderable part number?

The SN74CB3Q3244GQNR is the VFBGA-20 (GQN) package variant: 2.5 mm × 3.5 mm body, 0.5 mm ball pitch, 20 solder balls arranged in a 5×4 array, JEDEC MO-194 compliant. It is supplied in tape-and-reel format (1000 units/reel) with SNPB (SnPb) finish and MSL Level-1 rating (240°C peak reflow, unlimited floor life). SN74CB3Q3244GQNR offers the smallest footprint among all CB3Q3244 variants, optimized for space-constrained PCBs.