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

Texas Instruments SN74CBT3253D

Name: SN74CBT3253D
Brand: Texas Instruments
SKU: SN74CBT3253D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CBT3253D

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: SN74CBT3253D.pdf

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

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Product details

Overview

SN74CBT3253D from Texas Instruments is a dual 1-of-4 high-speed TTL-compatible FET multiplexer/demultiplexer in SOIC-16 package, featuring 5 Ω typical on-state resistance at 4.5 V, <0.25 ns propagation delay (VCC = 5 V), and ±1 μA max input leakage current. It enables bidirectional signal routing in data path switching applications such as bus isolation and address/data multiplexing.

For engineers reviewing the SN74CBT3253D datasheet, SN74CBT3253D pinout, SN74CBT3253D application, or SN74CBT3253D equivalent, key selection criteria include TTL-compatible control inputs, low on-resistance for minimal signal degradation, fast enable/disable timing (6.4 ns ten / 7 ns tdis), and operation across −40°C to 85°C industrial temperature range.

Technical Context

The SN74CBT3253D implements two independent 1-of-4 analog switches using NMOS pass-transistor architecture with TTL-level control logic. Each channel supports bidirectional signal flow between A and one of four B ports (B1–B4), selected by S0/S1 address lines and enabled via separate 1OE/2OE controls.

It operates with supply voltage from 4 V to 5.5 V, maintains rail-to-rail analog signal handling (VI/O = −0.5 V to 7 V), and delivers sub-nanosecond propagation delay due to low Ron–Cio product. Input capacitance is 3.5 pF per control pin; off-state B-port capacitance is 4 pF.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4 V to 5.5 V - Ensures compatibility with 5-V TTL and mixed-voltage system rails.
On-State Resistance	5 Ω typical at VCC = 4.5 V - Minimizes voltage drop and signal attenuation in high-speed digital or analog signal paths.
Propagation Delay	0.25 ns typical (VCC = 5 V) - Enables use in >1-GHz data switching without timing bottlenecks.
Enable Time (ten)	6.4 ns max - Supports rapid channel reconfiguration in dynamic bus arbitration systems.
Off-State Capacitance	4 pF (B port, OE = VCC) - Reduces crosstalk and loading in high-frequency multiplexed buses.
Input Leakage Current	±1 μA max - Prevents unintended biasing in high-impedance signal chains.
Operating Temperature	−40°C to +85°C - Qualified for industrial-grade embedded and communications equipment.

Pinout & Package

SN74CBT3253D is housed in a 16-pin SOIC (D) package, 7.4 mm × 5.0 mm footprint, 2.2 mm max height, with standard 1.27 mm pitch and gull-wing leads. Pin 1 index located at top-left corner with molded notch.

Pin/Terminal	Circuit Role	Design Meaning
1OE	Channel 1 output enable	Active-low control: drives 1A↔1Bx path when low; disconnects when high.
S1, S0	Address select inputs (MSB, LSB)	Binary-selects one of four B ports (1B1–1B4 or 2B1–2B4) per channel.
1A, 2A	Common input/output terminals	Bidirectional signal interface shared across all four B ports per channel.
1B1–1B4, 2B1–2B4	Channel-specific output terminals	Four dedicated signal paths per channel; electrically isolated when unselected.
2OE	Channel 2 output enable	Independent enable for second 1-of-4 switch; allows asynchronous channel control.
VCC, GND	Power supply and reference	Single 5-V supply; no separate analog/digital ground required.

Key Features

Feature	Design Value
TTL-compatible control inputs	VIH = 2 V min, VIL = 0.8 V max - Interfaces directly with legacy 5-V logic without level-shifting.
Bidirectional analog/digital switching	No inherent directionality - supports data flow from A→B or B→A with equal performance.
Low on-capacitance (10 pF)	Combines 3.5 pF control + 6.5 pF A-port capacitance - preserves signal integrity in >100-MHz applications.
Rail-to-rail signal handling	VI/O range −0.5 V to 7 V - Allows switching signals beyond VCC/GND, including partially powered systems.
Independent dual-channel control	Separate 1OE/2OE and shared S0/S1 - Enables synchronized or decoupled operation of both muxes.

Applications

PCI Bus Isolation	Memory Address Multiplexing
Use Scenario: Isolating PCI slot signals during hot-plug events to prevent bus contention and backdrive damage. IC Role / Device Role / Timing Role: Dual-channel bidirectional switch isolates AD[31:0] and C/BE#[3:0] lines under OE control while preserving timing-critical setup/hold margins. Use Value: 0.25 ns propagation delay ensures no violation of PCI 33-MHz timing budgets; 5 Ω Ron prevents signal reflection on stubbed traces.	Use Scenario: Reducing pin count on microcontrollers by sharing address/data lines between multiple memory banks. IC Role / Device Role / Timing Role: Configured as dual 1-of-4 demux to route common address bus to four SRAM/Flash devices based on upper address bits. Use Value: Independent 1OE/2OE allows staggered enable timing to avoid simultaneous memory access conflicts; TTL inputs simplify FPGA interface logic.
Test Equipment Signal Routing	Digital Audio Data Switching
Use Scenario: Automated test systems requiring flexible interconnection between DUT I/O and measurement instruments. IC Role / Device Role / Timing Role: High-speed analog switch matrix enabling reconfigurable signal paths for jitter-sensitive serial interfaces (e.g., SPI, I²C). Use Value: 4 pF off-capacitance minimizes crosstalk between adjacent channels; rail-to-rail VI/O accommodates varying instrument output levels.	Use Scenario: Selecting between multiple I²S audio sources (DACs, codecs) feeding a single amplifier or ADC. IC Role / Device Role / Timing Role: Bidirectional mux routes LRCLK, BCLK, and SDATA with matched propagation delay across all paths. Use Value: Sub-nanosecond tpd ensures phase coherence across stereo channels; low Ron avoids amplitude loss in high-impedance audio paths.

PCI Bus Isolation

Memory Address Multiplexing

Use Scenario: Isolating PCI slot signals during hot-plug events to prevent bus contention and backdrive damage.

IC Role / Device Role / Timing Role: Dual-channel bidirectional switch isolates AD[31:0] and C/BE#[3:0] lines under OE control while preserving timing-critical setup/hold margins.

Use Value: 0.25 ns propagation delay ensures no violation of PCI 33-MHz timing budgets; 5 Ω Ron prevents signal reflection on stubbed traces.

Use Scenario: Reducing pin count on microcontrollers by sharing address/data lines between multiple memory banks.

IC Role / Device Role / Timing Role: Configured as dual 1-of-4 demux to route common address bus to four SRAM/Flash devices based on upper address bits.

Use Value: Independent 1OE/2OE allows staggered enable timing to avoid simultaneous memory access conflicts; TTL inputs simplify FPGA interface logic.

Test Equipment Signal Routing

Digital Audio Data Switching

Use Scenario: Automated test systems requiring flexible interconnection between DUT I/O and measurement instruments.

IC Role / Device Role / Timing Role: High-speed analog switch matrix enabling reconfigurable signal paths for jitter-sensitive serial interfaces (e.g., SPI, I²C).

Use Value: 4 pF off-capacitance minimizes crosstalk between adjacent channels; rail-to-rail VI/O accommodates varying instrument output levels.

Use Scenario: Selecting between multiple I²S audio sources (DACs, codecs) feeding a single amplifier or ADC.

IC Role / Device Role / Timing Role: Bidirectional mux routes LRCLK, BCLK, and SDATA with matched propagation delay across all paths.

Use Value: Sub-nanosecond tpd ensures phase coherence across stereo channels; low Ron avoids amplitude loss in high-impedance audio paths.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 1-of-4 analog switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBTD3384D	Higher Ron (7 Ω typ), wider VCC range (3–5.5 V), integrated ESD protection (±2 kV HBM)	Better suited for mixed-voltage systems and environments with higher ESD risk	Select when operating below 4 V or requiring enhanced robustness; not drop-in due to different enable logic polarity.
TS3A226AEYFFR	Lower Ron (0.7 Ω typ), 1.65–3.6 V supply, 12-bit analog bandwidth, QFN-16 package	Optimized for portable, low-voltage, high-fidelity analog switching (e.g., audio, sensor front-ends)	Choose for battery-powered designs needing ultra-low Ron and sub-3.3 V operation; incompatible with 5-V TTL control.

Compared with SN74CBT3253D, SN74CBTD3384D trades slight speed reduction for broader voltage support and ESD hardening, while TS3A226AEYFFR offers superior analog performance at lower voltages but lacks TTL compatibility and industrial temperature rating.

Availability

SN74CBT3253D is available at Aetrix Electronics and suitable for PCI bus isolation, memory address multiplexing, automated test equipment signal routing, and digital audio data switching requiring stable component supply and long-term industrial lifecycle support.

Supply support for SN74CBT3253D 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 industrial, automotive, and communications markets.

The SN74CBT3253D belongs to TI's CBT (Crosspoint Bus Transceiver) family, designed specifically for high-speed, low-distortion signal routing in 5-V digital systems where minimal propagation delay and TTL compatibility are critical.

FAQ

What is the maximum continuous current rating for SN74CBT3253D?

The SN74CBT3253D supports up to 128 mA continuous channel current per switched path. This rating applies under recommended operating conditions (VCC = 4–5.5 V, TA = −40°C to 85°C) and assumes adequate PCB thermal relief. Exceeding this current may increase on-resistance or cause thermal shutdown in sustained operation.

Does SN74CBT3253D support bidirectional signal flow?

Yes, SN74CBT3253D supports fully bidirectional signal flow between the A terminal and any selected B terminal (B1–B4). Its FET-based architecture imposes no intrinsic directionality, enabling use in both multiplexer (A→Bx) and demultiplexer (Bx→A) configurations without performance penalty.

Can SN74CBT3253D operate with a 3.3-V supply?

No, SN74CBT3253D requires a minimum 4-V supply for guaranteed operation per its recommended conditions. At 3.3 V, control inputs may fail to meet TTL thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), and on-resistance increases significantly-potentially exceeding 15 Ω-degrading signal integrity.

What is the thermal resistance (θJA) of SN74CBT3253D in SOIC package?

The SN74CBT3253D in SOIC (D) package has a junction-to-ambient thermal resistance (θJA) of 73°C/W, measured per JESD 51-7. This value assumes standard JEDEC 2-layer board layout; actual thermal performance improves with copper pour and thermal vias under the exposed pad (if present) or power/ground planes.

Are unused control inputs required to be terminated on SN74CBT3253D?

Yes, all unused control inputs (S0, S1, 1OE, 2OE) must be tied to either VCC or GND to ensure predictable switching behavior and prevent floating-node-induced shoot-through or increased ICC. TI recommends referencing SCBA004 for implementation guidance on CMOS input termination.

SN74CBT3253D Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBT

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

Packaging:: Bulk

Product Status:: Active

Type:: Multiplexer/Demultiplexer

Circuit:: 2 x 4:1

Independent Circuits:: 1

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

SN74CBT3253D FAQ

1.How can I place an order for SN74CBT3253D through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CBT3253D 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 SN74CBT3253D reliable?

The price and inventory of SN74CBT3253D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3253D is usually 5 days.

3.What payment methods are accepted for SN74CBT3253D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3253D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74CBT3253D?

SN74CBT3253D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CBT3253D 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 SN74CBT3253D?

For technical support, including SN74CBT3253D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3253D requirements.

6.How does Aetrix verify that SN74CBT3253D is sourced from the original manufacturer or authorized distributors?

All SN74CBT3253D 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 SN74CBT3253D meets industry standards.

7.What is the process for return or replacement of SN74CBT3253D?

All SN74CBT3253D units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3253D, 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 SN74CBT3253D part is unused and in its original packaging.

Return procedure for SN74CBT3253D:

1.Submit a request within 90 days.

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

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