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

Texas Instruments 74CB3Q3253DBQRG4

Name: 74CB3Q3253DBQRG4
Brand: Texas Instruments
SKU: 74CB3Q3253DBQRG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74CB3Q3253DBQRG4

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-SSOP (0.154", 3.90mm Width)

Datasheet:: 74CB3Q3253DBQRG4.pdf

Description:: IC MUX/DEMUX 2 X 4:1 16SSOP

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Product details

Overview

74CB3Q3253DBQRG4 from Texas Instruments is a dual 1-of-4 FET bus switch with bidirectional signal routing, 4 Ω typical ON-state resistance, 500 MHz bandwidth, and 2.3 V–3.6 V supply operation. It enables rail-to-rail switching (0–5 V with 3.3 V V_CC) in high-speed digital interfaces such as USB and differential bus isolation.

For engineers reviewing the 74CB3Q3253DBQRG4 datasheet, 74CB3Q3253DBQRG4 pinout, 74CB3Q3253DBQRG4 application, or 74CB3Q3253DBQRG4 equivalent, key selection criteria include its low 3.5 pF OFF-state I/O capacitance, I_off partial-power-down support, 20 MHz maximum enable-switching frequency, and SSOP-16 package compatibility with legacy board layouts.

Technical Context

The 74CB3Q3253DBQRG4 integrates two independent 1-of-4 multiplexer/demultiplexer channels, each controlled by active-low OE inputs (1OE, 2OE) and 2-bit binary select lines (S0, S1). Its charge-pump-enhanced FET architecture delivers flat r_on across voltage and temperature, enabling near-zero propagation delay (0.12–0.18 ns) and bidirectional data flow without direction control.

Each channel supports 5-V tolerant I/Os regardless of V_CC state (powered up or down), with undershoot clamp diodes on all control and data pins. The device meets JESD 78 Class II latch-up immunity (>100 mA) and JESD 22 ESD ratings (2000-V HBM, 1000-V CDM), ensuring robustness in hot-plug and mixed-voltage system environments.

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 5-V I/O tolerance.
r_on (Typical)	4 Ω at V_CC = 2.5 V - Minimizes insertion loss and signal distortion in high-frequency analog/digital signal paths.
Bandwidth	Up to 500 MHz - Supports high-speed serial links including USB 2.0 and LVDS-based interconnects without attenuation.
C_io(OFF)	3.5 pF (B port) - Reduces capacitive loading on driven buses, preserving signal integrity and timing margins.
Propagation Delay	0.12–0.18 ns - Enables sub-nanosecond timing-critical switching in FPGA I/O expansion and memory multiplexing.
I_off Support	Active at V_CC = 0 V - Prevents back-current during partial power-down, critical for hot-swap and power-gated subsystems.
ESD Rating	2000-V HBM, 1000-V CDM - Meets industrial-grade reliability requirements without external protection circuitry.

Pinout & Package

74CB3Q3253DBQRG4 is packaged in a 16-pin SSOP (DBQ) with 4.90 mm × 3.90 mm body size and standard 0.65 mm lead pitch. The package is RoHS-compliant, moisture-sensitive level 2 (260°C peak reflow), and optimized for automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Active-low output enable	Independent channel gating: drives associated A–B path into high-Z when high; enables bidirectional conduction when low.
S0, S1	Binary channel select	2-bit address selects one of four B-port connections per channel (B1–B4); supports 1-of-4 mux/demux functionality.
1A, 2A	Common channel input/output	Shared bidirectional port per channel; connects to selected B_n terminal when OE is asserted.
1B1–1B4, 2B1–2B4	Channel-specific I/O terminals	Four dedicated bidirectional data paths per channel; each electrically isolated when unselected.
V_CC	Power supply	Single 2.3–3.6 V supply powers internal charge pump and logic; no separate analog/digital rails required.
GND	Ground reference	Common return for all signals and internal circuitry; must be low-impedance for stable r_on and EMI performance.

Key Features

Feature	Design Value
Rail-to-rail signal switching	Supports 0–5 V signals with 3.3 V V_CC, enabling seamless interface between 1.8 V/2.5 V/3.3 V/5 V domains without level shifters.
Charge-pump gate drive	Elevates pass-transistor gate voltage above V_CC, ensuring flat r_on across full input voltage range and temperature.
5-V tolerant I/Os (V_CC = 0 V)	Allows safe connection to live 5 V buses during power sequencing or partial shutdown-no external blocking diodes needed.
Low dynamic power	0.6 mA typical I_CC at 3.3 V supports energy-efficient operation in portable and thermally constrained designs.
Undershoot clamp diodes	Integrated protection on all I/O and control pins limits negative transients to –1.8 V, reducing need for external TVS components.

Applications

USB 2.0 Signal Routing	Differential Bus Isolation
Use Scenario: Switching USB D+/D− lines between host controller and multiple peripheral ports in embedded hubs or docking stations. IC Role / Device Role / Timing Role: Bidirectional analog switch providing sub-ns propagation delay and 5-V tolerant signaling to maintain USB 2.0 eye diagram compliance. Use Value: Eliminates need for discrete MOSFET arrays or dedicated USB switches, reducing BOM count and PCB area while preserving signal fidelity up to 480 Mbps.	Use Scenario: Isolating LVDS or RSDS differential pairs between FPGA I/O banks and display/video interface ICs during power-state transitions. IC Role / Device Role / Timing Role: High-bandwidth, low-capacitance bus switch enabling clean break-before-make switching without signal reflection or crosstalk. Use Value: Maintains differential impedance integrity (<1 % r_on variation) and minimizes skew (<0.06 ns) across both legs of the pair, preventing common-mode noise injection.
FPGA I/O Expansion	Memory Multiplexing
Use Scenario: Expanding limited FPGA GPIO count by sharing data/address lines among multiple peripherals (e.g., SPI flash, sensors, DACs) via time-division routing. IC Role / Device Role / Timing Role: Dual-channel 1-of-4 mux/demux with independent OE control allows concurrent access to two peripheral groups without software arbitration overhead. Use Value: Delivers deterministic <0.2 ns max t_pd and 4 Ω r_on, ensuring setup/hold timing margins are preserved even at 100+ MHz clock rates.	Use Scenario: Sharing a single DDR2/DDR3 memory controller bus across two independent memory modules (e.g., local RAM + configuration storage) in space-constrained SoM designs. IC Role / Device Role / Timing Role: Low-distortion, bidirectional switch supporting 0–3.3 V signaling at 2.5 V V_CC, with I_off preventing leakage during module deselection. Use Value: Enables memory arbitration without adding latency or requiring additional controller logic-critical for real-time firmware boot sequences.

USB 2.0 Signal Routing

Differential Bus Isolation

Use Scenario: Switching USB D+/D− lines between host controller and multiple peripheral ports in embedded hubs or docking stations.

IC Role / Device Role / Timing Role: Bidirectional analog switch providing sub-ns propagation delay and 5-V tolerant signaling to maintain USB 2.0 eye diagram compliance.

Use Value: Eliminates need for discrete MOSFET arrays or dedicated USB switches, reducing BOM count and PCB area while preserving signal fidelity up to 480 Mbps.

Use Scenario: Isolating LVDS or RSDS differential pairs between FPGA I/O banks and display/video interface ICs during power-state transitions.

IC Role / Device Role / Timing Role: High-bandwidth, low-capacitance bus switch enabling clean break-before-make switching without signal reflection or crosstalk.

Use Value: Maintains differential impedance integrity (<1 % r_on variation) and minimizes skew (<0.06 ns) across both legs of the pair, preventing common-mode noise injection.

FPGA I/O Expansion

Memory Multiplexing

Use Scenario: Expanding limited FPGA GPIO count by sharing data/address lines among multiple peripherals (e.g., SPI flash, sensors, DACs) via time-division routing.

IC Role / Device Role / Timing Role: Dual-channel 1-of-4 mux/demux with independent OE control allows concurrent access to two peripheral groups without software arbitration overhead.

Use Value: Delivers deterministic <0.2 ns max t_pd and 4 Ω r_on, ensuring setup/hold timing margins are preserved even at 100+ MHz clock rates.

Use Scenario: Sharing a single DDR2/DDR3 memory controller bus across two independent memory modules (e.g., local RAM + configuration storage) in space-constrained SoM designs.

IC Role / Device Role / Timing Role: Low-distortion, bidirectional switch supporting 0–3.3 V signaling at 2.5 V V_CC, with I_off preventing leakage during module deselection.

Use Value: Enables memory arbitration without adding latency or requiring additional controller logic-critical for real-time firmware boot sequences.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3253PWR	Higher r_on (7 Ω typical), no charge pump, 5-V only supply (4.5–5.5 V), no I_off support	Limited to 5-V systems; unsuitable for partial-power-down or mixed-voltage rail scenarios	Select when cost sensitivity outweighs voltage flexibility and power-down safety requirements.
PI3CH403QE	Lower bandwidth (300 MHz), higher C_io(OFF) (6.5 pF), same SSOP-16 footprint but different pinout (non-pin-compatible)	Requires PCB redesign; less suitable for >400 MHz USB or DDRx applications due to bandwidth and capacitance limitations	Consider only if existing layout accommodates pinout change and 300 MHz bandwidth suffices for target data rate.

Compared with SN74CBT3253PWR and PI3CH403QE, the 74CB3Q3253DBQRG4 uniquely combines 500 MHz bandwidth, 4 Ω r_on, I_off-enabled partial power-down, and true 0–5 V signal handling at 2.5/3.3 V V_CC, making it optimal for next-generation mixed-signal interface consolidation.

Availability

74CB3Q3253DBQRG4 is available at Aetrix Electronics and suitable for USB 2.0 routing, FPGA I/O expansion, and memory multiplexing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SSOP packaging.

Supply support for 74CB3Q3253DBQRG4 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 CB3Q family-including 74CB3Q3253DBQRG4-is engineered for high-bandwidth, low-distortion signal routing in mixed-voltage digital systems, targeting USB, PCIe, memory, and video interface applications where timing precision and power-state robustness are critical.

FAQ

What is the maximum operating frequency supported by the 74CB3Q3253DBQRG4?

The 74CB3Q3253DBQRG4 supports a maximum signal bandwidth of 500 MHz, verified under load conditions with minimal trace parasitics. This enables reliable operation in USB 2.0 (480 Mbps), DDR2/DDR3 address/data multiplexing, and other high-speed digital interfaces where signal integrity is maintained through low r_on and sub-0.2 ns propagation delay. Actual system-level frequency depends on PCB layout and termination.

Does the 74CB3Q3253DBQRG4 support partial power-down mode?

Yes, the 74CB3Q3253DBQRG4 features I_off circuitry that actively disables current flow when V_CC = 0 V, preventing damaging back-current from live I/O lines into a powered-down system. This capability is essential for hot-plug interfaces, modular systems with independent power domains, and energy-efficient standby modes-verified per JESD 78 Class II latch-up standards.

Can the 74CB3Q3253DBQRG4 operate with a 2.5 V supply while interfacing with 5 V signals?

Yes, the 74CB3Q3253DBQRG4 supports rail-to-rail switching: with V_CC = 2.5 V, it reliably passes 0–3.3 V signals, and with V_CC = 3.3 V, it handles 0–5 V signals. Its 5-V tolerant I/Os remain functional even when V_CC is unpowered, allowing safe connection to live 5 V buses during power sequencing-no external level shifters or clamping required.

What is the ON-state resistance (r_on) specification for the 74CB3Q3253DBQRG4?

The 74CB3Q3253DBQRG4 has a typical ON-state resistance of 4 Ω at V_CC = 2.5 V and 3.5 Ω at V_CC = 3.0 V, measured at ±15 mA. This low, flat r_on profile-achieved via internal charge-pump gate drive-minimizes insertion loss and ensures consistent signal amplitude across voltage and temperature, critical for analog signal gating and high-fidelity digital switching in the 74CB3Q3253DBQRG4.

Is the 74CB3Q3253DBQRG4 pin-compatible with other members of the CB3Q family?

Yes, the 74CB3Q3253DBQRG4 shares identical pinout and function mapping with all SN74CB3Q3253 variants (e.g., DBQR, DGV, RGY, PW packages), including matching SSOP-16 pin assignments for 1OE, S1, 1B4–1B1, 1A, GND, 2A, 2B1–2B4, S0, 2OE, and V_CC. This allows drop-in replacement across package types without layout changes-confirmed in TI's official Pin Configuration and Functions documentation.

74CB3Q3253DBQRG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CB

Package/Case:: 16-SSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Type:: Multiplexer/Demultiplexer

Circuit:: 2 x 4:1

Independent Circuits:: 1

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:: 16-SSOP

74CB3Q3253DBQRG4 FAQ

1.How can I place an order for 74CB3Q3253DBQRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74CB3Q3253DBQRG4 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 74CB3Q3253DBQRG4 reliable?

The price and inventory of 74CB3Q3253DBQRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CB3Q3253DBQRG4 is usually 5 days.

3.What payment methods are accepted for 74CB3Q3253DBQRG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74CB3Q3253DBQRG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74CB3Q3253DBQRG4?

74CB3Q3253DBQRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74CB3Q3253DBQRG4 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 74CB3Q3253DBQRG4?

For technical support, including 74CB3Q3253DBQRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CB3Q3253DBQRG4 requirements.

6.How does Aetrix verify that 74CB3Q3253DBQRG4 is sourced from the original manufacturer or authorized distributors?

All 74CB3Q3253DBQRG4 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 74CB3Q3253DBQRG4 meets industry standards.

7.What is the process for return or replacement of 74CB3Q3253DBQRG4?

All 74CB3Q3253DBQRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74CB3Q3253DBQRG4, 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 74CB3Q3253DBQRG4 part is unused and in its original packaging.

Return procedure for 74CB3Q3253DBQRG4:

1.Submit a request within 90 days.

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

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