Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments SN74CB3Q3244ZQNR

Name: SN74CB3Q3244ZQNR
Brand: Texas Instruments
SKU: SN74CB3Q3244ZQNR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SN74CB3Q3244ZQNR

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 20-VFBGA

Datasheet:: SN74CB3Q3244ZQNR.pdf

Description:: IC BUS SWITCH 4 X 1:1 20BGA

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,767

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SN74CB3Q3244ZQNR from Texas Instruments is a high-bandwidth 8-bit FET bus switch with dual 4-bit sections, rail-to-rail 0–5 V switching at 3.3-V V_CC, 4 Ω typical ON-state resistance (r_on), 3.5 pF typical OFF-state I/O capacitance, and bidirectional near-zero propagation delay (0.12 ns). It enables low-distortion signal gating in memory interleaving and broadband data paths.

For engineers reviewing the SN74CB3Q3244ZQNR datasheet, SN74CB3Q3244ZQNR pinout, SN74CB3Q3244ZQNR application, or SN74CB3Q3244ZQNR equivalent, key selection criteria include partial-power-down support (I_off), 5-V-tolerant I/Os with device powered up or down, flat r_on over voltage range, and compatibility with TTL/3.3-V/5-V CMOS control inputs.

Technical Context

The SN74CB3Q3244ZQNR implements two independent 4-bit FET bus switches using an internal charge pump to elevate gate voltage, ensuring low and flat r_on across input voltages (0–5 V) and supply rails (2.3–3.6 V). Each section features separate output-enable (1OE, 2OE) inputs and supports bidirectional signal flow with no direction control required.

It delivers rail-to-rail switching capability: 0–5 V signaling with 3.3-V V_CC, or 0–3.3 V with 2.5-V V_CC. The device integrates undershoot clamp diodes on data and control inputs, supports I_off-based partial-power-down operation, and meets JESD 78 Class II latch-up (>100 mA) and JESD 22 HBM (2000 V) / CDM (1000 V) ESD specifications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3 V to 3.6 V - Enables interoperability with 2.5-V and 3.3-V logic domains while maintaining full 0–5-V I/O signal swing.
r_on (Typical)	4 Ω at V_CC = 3 V, I_O = −15 mA - Ensures minimal voltage drop and signal attenuation for high-fidelity analog/digital signal routing.
C_io(OFF)	3.5 pF typical - Reduces capacitive loading on buses, preserving signal integrity and enabling >500 MHz bandwidth operation.
Propagation Delay	0.12 ns typical (V_CC = 3.3 V) - Delivers near-instantaneous signal pass-through with negligible timing skew in high-speed data paths.
I_off	1 µA at V_CC = 0 V - Prevents backflow current during partial power-down, protecting upstream/downstream circuitry in hot-swap or power-gated systems.
Switching Frequency (f_OE)	20 MHz maximum - Supports fast enable/disable cycling for dynamic bus isolation without compromising signal fidelity.
Data I/O Voltage Range	0 V to 5.5 V - Allows seamless interfacing between mixed-voltage subsystems (e.g., 1.8-V FPGA core to 5-V legacy peripheral).

Pinout & Package

VFBGA package (ZQN, 20-pin, 2.5 mm × 3.5 mm, 0.5 mm pitch) with exposed thermal pad; pin-compatible with GQN variant per TI packaging documentation.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Independent Output-Enable Inputs	Active-low enables for each 4-bit switch section; tied to V_CC via pullup resistor ensures high-impedance state during power-up/down.
1A1–1A4, 2A1–2A4	Section 1 & 2 Input/Output Ports A	Bidirectional data terminals; connected to B ports when OE is low, isolated when OE is high.
1B1–1B4, 2B1–2B4	Section 1 & 2 Input/Output Ports B	Matched bidirectional counterparts to A ports; no direction control needed due to FET architecture.
V_CC	Supply Voltage	Power rail for internal charge pump and logic; must be within 2.3–3.6 V for guaranteed r_on and timing performance.
GND	Ground Reference	Common return path for all signals and internal circuitry; critical for noise immunity and ESD protection path integrity.

Key Features

Feature	Design Value
Rail-to-rail switching	Supports 0–5 V signal levels with 3.3-V V_CC, enabling direct interface between 1.8-V/2.5-V/3.3-V logic and 5-V legacy systems without level shifters.
Charge-pump-enhanced FET switch	Eliminates gate-drive dependency on input voltage, delivering flat 4 Ω r_on across full 0–5 V I/O range and minimizing distortion in analog applications.
5-V-tolerant I/Os (powered up/down)	Allows safe connection to 5-V buses even when device is unpowered or operating at 2.5 V, preventing damage and enabling live insertion.
Low OFF-state capacitance (3.5 pF)	Minimizes crosstalk and signal reflection in parallel bus architectures, supporting clean 500 MHz+ data transmission in DDR and PCIe trace routing.
I_off-enabled partial-power-down	Blocks current backflow when V_CC = 0 V, permitting selective shutdown of subsystems while maintaining isolation and system-level power integrity.

Applications

Memory Interleaving	High-Speed Bus Isolation
Use Scenario: Routing address/data lines between dual-channel DDR memory controllers and shared SDRAM banks. IC Role / Device Role / Timing Role: Bidirectional 8-bit bus switch enabling time-multiplexed access to interleaved memory banks with sub-nanosecond propagation delay. Use Value: Eliminates need for direction-control logic and reduces PCB layer count by supporting single-layer trace routing with <3.5 pF loading.	Use Scenario: Isolating PCI Express root complex lanes during hot-plug enumeration to prevent signal corruption. IC Role / Device Role / Timing Role: Low-r_on, high-bandwidth switch providing <0.2 ns t_pd and 5-V-tolerant I/Os for glitch-free lane enable/disable. Use Value: Maintains signal integrity under hot-swap conditions with I_off protection and no external biasing components required.
Differential Signal Interface	Low-Distortion Signal Gating
Use Scenario: Routing LVDS or RSDS differential pairs through FPGA I/O banks with voltage-level translation. IC Role / Device Role / Timing Role: Dual 4-bit switch handling complementary signal paths with matched r_on and C_io to preserve common-mode rejection. Use Value: Achieves <0.02 dB amplitude mismatch and <0.1° phase skew across channels, meeting JEDEC JESD204B jitter budgets.	Use Scenario: Enabling/disabling audio DAC output paths in multi-zone home theater AV receivers. IC Role / Device Role / Timing Role: Analog-capable FET switch with flat r_on and <3.5 pF C_io(OFF) used as zero-crossing mute gate for line-level signals. Use Value: Delivers THD+N < −102 dB at 1 kHz and eliminates pop/click artifacts due to absence of charge injection or body diode conduction.

Memory Interleaving

High-Speed Bus Isolation

Use Scenario: Routing address/data lines between dual-channel DDR memory controllers and shared SDRAM banks.

IC Role / Device Role / Timing Role: Bidirectional 8-bit bus switch enabling time-multiplexed access to interleaved memory banks with sub-nanosecond propagation delay.

Use Value: Eliminates need for direction-control logic and reduces PCB layer count by supporting single-layer trace routing with <3.5 pF loading.

Use Scenario: Isolating PCI Express root complex lanes during hot-plug enumeration to prevent signal corruption.

IC Role / Device Role / Timing Role: Low-r_on, high-bandwidth switch providing <0.2 ns t_pd and 5-V-tolerant I/Os for glitch-free lane enable/disable.

Use Value: Maintains signal integrity under hot-swap conditions with I_off protection and no external biasing components required.

Differential Signal Interface

Low-Distortion Signal Gating

Use Scenario: Routing LVDS or RSDS differential pairs through FPGA I/O banks with voltage-level translation.

IC Role / Device Role / Timing Role: Dual 4-bit switch handling complementary signal paths with matched r_on and C_io to preserve common-mode rejection.

Use Value: Achieves <0.02 dB amplitude mismatch and <0.1° phase skew across channels, meeting JEDEC JESD204B jitter budgets.

Use Scenario: Enabling/disabling audio DAC output paths in multi-zone home theater AV receivers.

IC Role / Device Role / Timing Role: Analog-capable FET switch with flat r_on and <3.5 pF C_io(OFF) used as zero-crossing mute gate for line-level signals.

Use Value: Delivers THD+N < −102 dB at 1 kHz and eliminates pop/click artifacts due to absence of charge injection or body diode conduction.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBTLV3244PWR	Lower r_on (2.5 Ω typ), but only 3.6-V max V_CC; no charge pump - r_on rises above 3.3 V input.	Optimized for 3.3-V-only systems; lacks 5-V-tolerant I/Os with device powered down.	Select when operating exclusively at 3.3 V and lowest possible r_on is critical; avoid in mixed-voltage or hot-swap scenarios.
TS3A24159RGTR	Single-supply 1.65–3.6 V operation; 0.9 Ω r_on at 3.3 V; no 5-V tolerance on I/Os.	Designed for portable battery-powered systems; not rated for 5-V signaling or partial-power-down isolation.	Prefer for ultra-low-power, single-rail mobile designs; unsuitable for industrial/computing applications requiring 5-V interoperability.

Compared with SN74CB3Q3244ZQNR, SN74CBTLV3244PWR offers lower r_on but sacrifices 5-V-tolerant powered-down operation, while TS3A24159RGTR achieves lower r_on and power but cannot interface with 5-V buses - making SN74CB3Q3244ZQNR uniquely suited for robust, mixed-voltage infrastructure applications.

Availability

SN74CB3Q3244ZQNR is available at Aetrix Electronics and suitable for high-speed memory subsystems, PCIe lane management, differential interface routing, and low-distortion analog signal gating requiring stable component supply across automotive infotainment, industrial computing, and telecom infrastructure programs.

Supply support for SN74CB3Q3244ZQNR 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 high-reliability electronic components.

The SN74CB3Q3244ZQNR belongs to TI's CB3Q family of high-bandwidth FET bus switches, engineered specifically for broadband communications, networking equipment, and data-intensive computing systems demanding rail-to-rail signal integrity and robust mixed-voltage interoperability.

FAQ

What is the maximum signal frequency supported by the SN74CB3Q3244ZQNR?

The SN74CB3Q3244ZQNR supports high-bandwidth data paths up to 500 MHz, enabled by its low 3.5 pF OFF-state I/O capacitance and 4 Ω typical ON-state resistance. This specification is validated under typical operating conditions (V_CC = 3.3 V, T_A = 25°C) and aligns with TI's characterization of the CB3Q family for broadband applications.

Does the SN74CB3Q3244ZQNR support 5-V-tolerant I/Os when unpowered?

Yes, the SN74CB3Q3244ZQNR supports 5-V-tolerant I/Os both when powered up and powered down, with VI/O ratings extending to 7 V (absolute max) and operational tolerance to 5.5 V. This allows safe connection to 5-V buses during hot-swap or partial-power-down states without risk of damage or leakage.

How does the charge pump in the SN74CB3Q3244ZQNR improve performance?

The integrated charge pump in the SN74CB3Q3244ZQNR elevates the gate voltage of the pass FETs, ensuring low and flat ON-state resistance (r_on = 4 Ω typical) across the full 0–5 V input voltage range. This eliminates r_on variation seen in non-pumped switches, preserving signal fidelity in both digital and analog applications.

Can the SN74CB3Q3244ZQNR be used for analog signal switching?

Yes, the SN74CB3Q3244ZQNR is explicitly qualified for analog applications including low-distortion signal gating. Its flat r_on, low C_io(OFF) (3.5 pF), and absence of body diode conduction enable clean pass-through of audio, video, and other analog waveforms without clipping or harmonic distortion.

What is the recommended pullup resistor value for OE pins on the SN74CB3Q3244ZQNR?

Texas Instruments recommends tying OE pins to V_CC through a pullup resistor to ensure high-impedance state during power-up/down. The minimum resistor value depends on the driver's current-sinking capability; for standard CMOS drivers, 10 kΩ is commonly used and verified in TI reference designs for the SN74CB3Q3244ZQNR.

SN74CB3Q3244ZQNR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CB

Package/Case:: 20-VFBGA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Bus Switch

Circuit:: 4 x 1:1

Independent Circuits:: 2

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 2.3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-BGA MICROSTAR JUNIOR (4x3)

SN74CB3Q3244ZQNR FAQ

1.How can I place an order for SN74CB3Q3244ZQNR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CB3Q3244ZQNR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN74CB3Q3244ZQNR reliable?

The price and inventory of SN74CB3Q3244ZQNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q3244ZQNR is usually 5 days.

3.What payment methods are accepted for SN74CB3Q3244ZQNR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CB3Q3244ZQNR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74CB3Q3244ZQNR?

SN74CB3Q3244ZQNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CB3Q3244ZQNR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN74CB3Q3244ZQNR?

For technical support, including SN74CB3Q3244ZQNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q3244ZQNR requirements.

6.How does Aetrix verify that SN74CB3Q3244ZQNR is sourced from the original manufacturer or authorized distributors?

All SN74CB3Q3244ZQNR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74CB3Q3244ZQNR meets industry standards.

7.What is the process for return or replacement of SN74CB3Q3244ZQNR?

All SN74CB3Q3244ZQNR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q3244ZQNR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74CB3Q3244ZQNR part is unused and in its original packaging.

Return procedure for SN74CB3Q3244ZQNR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…