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

Texas Instruments SN74CBTLV3257D

Name: SN74CBTLV3257D
Brand: Texas Instruments
SKU: SN74CBTLV3257D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CBTLV3257D

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: SN74CBTLV3257D.pdf

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

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Product details

Overview

SN74CBTLV3257D from Texas Instruments is a low-voltage 4-bit 1-of-2 FET multiplexer/demultiplexer in SOIC-16 package, featuring 5 Ω on-state resistance, rail-to-rail switching, and I_off partial-power-down support. It enables bidirectional signal routing between four common A ports and eight B-side channels (B1/B2 per channel), with active-low OE and single S select control - used in high-speed bus switching for enterprise computing and wired networking.

For engineers reviewing the SN74CBTLV3257D datasheet, SN74CBTLV3257D pinout, SN74CBTLV3257D application, or SN74CBTLV3257D equivalent, key selection criteria include its 5 Ω r_on at 3.3 V, <2.5 ns propagation delay, ±128 mA channel current rating, I_off-enabled isolation during power-down, and compatibility with 2.3–3.6 V supply rails.

Technical Context

The SN74CBTLV3257D implements four independent FET-based analog switches, each configurable as 1-of-2 mux/demux via shared S and OE controls. Its CMOS-compatible inputs drive internal transmission gates with rail-to-rail voltage handling up to 4.6 V, supporting hot-swap and level-shifting across mixed-voltage domains.

Functional operation follows a two-level enable hierarchy: OE must be low to activate switching, then S selects between B1 (S = L) or B2 (S = H) for each A port. The device maintains high-impedance isolation when OE is high or V_CC = 0, enforced by I_off leakage ≤15 µA and latch-up immunity >100 mA per JESD 78 Class II.

Key Specifications

Parameter	Value and Actual Design Meaning
On-state resistance (r_on)	5 Ω typical at V_CC = 3.3 V, 64 mA - ensures minimal signal attenuation and voltage drop in high-speed data paths.
Propagation delay (t_pd)	0.15–0.25 ns at V_CC = 2.5 V - supports >200 MHz signal routing without timing degradation.
Supply voltage range	2.3 V to 3.6 V - compatible with 2.5 V and 3.3 V logic systems, including LVTTL and LVCMOS interfaces.
I_off current	≤15 µA at V_CC = 0 V - prevents backflow current and enables safe partial-power-down in multi-rail systems.
ESD protection	2000 V HBM, 200 V MM - meets industrial robustness requirements without external protection circuitry.
Channel current rating	±128 mA continuous - supports driving moderate capacitive loads and fan-out in bus architectures.
Operating temperature	–40 °C to +85 °C - qualified for commercial and industrial ambient environments.

Pinout & Package

SN74CBTLV3257D uses a 16-pin SOIC (D) package measuring 9.90 mm × 3.91 mm, with standard 1.27 mm pitch and gull-wing leads. Thermal resistance R_θJA is 102.5 °C/W, suitable for board-level convection cooling without heatsinking.

Pin/Terminal	Circuit Role	Design Meaning
1A, 2A, 3A, 4A	Common I/O port	Bidirectional signal path shared across both B1 and B2 branches of each channel.
1B1–4B1, 1B2–4B2	Branch I/O port	Eight dedicated I/O terminals - each A port connects to corresponding B1 and B2 pairs under S control.
S	Select input	Active-High logic selects B2 branch (S = H) or B1 branch (S = L) for all four channels simultaneously.
OE	Output Enable	Active-Low global enable - high state forces all switches into high-impedance isolation mode.
V_CC	Power supply	Single 2.3–3.6 V supply powering internal logic and switch bias; requires local 0.1 µF decoupling.
GND	Ground reference	Return path for all I/O and supply currents; must be low-impedance and adjacent to V_CC decoupling.

Key Features

Feature	Design Value
5 Ω low on-resistance	Minimizes insertion loss and distortion in high-frequency digital and analog signal paths up to 200 MHz.
Rail-to-rail I/O switching	Supports full 0–V_CC signal swing on all ports, enabling interoperability across 1.8 V, 2.5 V, and 3.3 V logic families.
I_off partial-power-down	Blocks current flow when V_CC = 0, allowing safe hot-plug operation and preventing system-level backdrive damage.
High ESD immunity	2000 V HBM rating eliminates need for external TVS diodes in most board-level ESD environments.
Latch-up immunity	Exceeds 100 mA per JESD 78 Class II - ensures robust operation under transient overvoltage and ground bounce.

Applications

Datacenter Bus Switching	Industrial Ethernet PHY Interface
Use Scenario: Selecting between dual upstream network controllers sharing a single 4-bit MDIO management bus in a 1U server chassis. IC Role / Device Role / Timing Role: Bidirectional 4-bit 1-of-2 mux isolating controller access to PHY registers while maintaining signal integrity at 25 MHz. Use Value: Eliminates need for discrete logic or FPGA-based arbitration; 5 Ω r_on preserves rise/fall times and reduces jitter accumulation across cascaded PHYs.	Use Scenario: Routing differential clock and data lanes between two redundant Ethernet PHYs and a single MAC interface in a programmable logic controller. IC Role / Device Role / Timing Role: Low-latency analog switch enabling failover switching with sub-nanosecond skew control and no DC blocking. Use Value: Enables seamless hardware redundancy without re-timing or level translation; rail-to-rail operation preserves common-mode voltage margins required by IEEE 802.3 standards.
Building Automation Controller Hub	Motor Drive Communication Interface
Use Scenario: Multiplexing RS-485 transceiver connections among multiple HVAC sensor nodes sharing one UART interface on a central controller PCB. IC Role / Device Role / Timing Role: 4-bit bidirectional analog switch managing half-duplex bus arbitration with automatic direction control via OE/S sequencing. Use Value: Reduces component count vs. discrete MOSFET solutions; I_off prevents bus contention during controller reset or firmware update cycles.	Use Scenario: Isolating CAN FD and SPI debug interfaces on a servo drive module where space-constrained layout requires shared trace routing. IC Role / Device Role / Timing Role: Signal-path selector enabling simultaneous CAN FD communication and real-time SPI register access without cross-talk. Use Value: 0.25 ns t_pd avoids timing violations in 5 Mbps CAN FD bit streams; ±128 mA rating handles transceiver output drive requirements.

Datacenter Bus Switching

Industrial Ethernet PHY Interface

Use Scenario: Selecting between dual upstream network controllers sharing a single 4-bit MDIO management bus in a 1U server chassis.

IC Role / Device Role / Timing Role: Bidirectional 4-bit 1-of-2 mux isolating controller access to PHY registers while maintaining signal integrity at 25 MHz.

Use Value: Eliminates need for discrete logic or FPGA-based arbitration; 5 Ω r_on preserves rise/fall times and reduces jitter accumulation across cascaded PHYs.

Use Scenario: Routing differential clock and data lanes between two redundant Ethernet PHYs and a single MAC interface in a programmable logic controller.

IC Role / Device Role / Timing Role: Low-latency analog switch enabling failover switching with sub-nanosecond skew control and no DC blocking.

Use Value: Enables seamless hardware redundancy without re-timing or level translation; rail-to-rail operation preserves common-mode voltage margins required by IEEE 802.3 standards.

Building Automation Controller Hub

Motor Drive Communication Interface

Use Scenario: Multiplexing RS-485 transceiver connections among multiple HVAC sensor nodes sharing one UART interface on a central controller PCB.

IC Role / Device Role / Timing Role: 4-bit bidirectional analog switch managing half-duplex bus arbitration with automatic direction control via OE/S sequencing.

Use Value: Reduces component count vs. discrete MOSFET solutions; I_off prevents bus contention during controller reset or firmware update cycles.

Use Scenario: Isolating CAN FD and SPI debug interfaces on a servo drive module where space-constrained layout requires shared trace routing.

IC Role / Device Role / Timing Role: Signal-path selector enabling simultaneous CAN FD communication and real-time SPI register access without cross-talk.

Use Value: 0.25 ns t_pd avoids timing violations in 5 Mbps CAN FD bit streams; ±128 mA rating handles transceiver output drive requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBTLV3257PW	TSSOP-16 package (5.00 mm × 4.40 mm); identical electrical specs and pinout; R_θJA = 129.1 °C/W.	Better suited for high-density layouts requiring smaller footprint than SOIC; same thermal derating curve above 50 mW.	Choose SN74CBTLV3257PW when board area is constrained and reflow profile supports Level-1 moisture sensitivity.
SN74CBTLV3257DGVR	TVSOP-16 package (3.60 mm × 4.40 mm); identical functionality; R_θJA = 123.1 °C/W; MSL Level-1.	Optimized for ultra-thin consumer and telecom modules; lower profile (1.2 mm max height) than SOIC or TSSOP.	Choose SN74CBTLV3257DGVR for portable or stacked PCB assemblies where Z-height is critical and thermal load remains below 80 mW.

Compared with SN74CBTLV3257D, SN74CBTLV3257PW offers 27% smaller footprint but higher thermal resistance, while SN74CBTLV3257DGVR delivers the lowest profile and best MSL rating - all three share identical switching performance, I_off, and ESD ratings.

Availability

SN74CBTLV3257D is available at Aetrix Electronics and suitable for datacenter bus switching, industrial Ethernet PHY interface, and building automation controller hub applications requiring stable component supply and long-term obsolescence management.

Supply support for SN74CBTLV3257D 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 decades of expertise in high-speed interface solutions.

The SN74CBTLV3257D belongs to TI's CBTLV logic family, engineered for low-voltage, high-bandwidth signal routing in enterprise infrastructure and industrial communications systems where minimal propagation delay and robust power-down behavior are essential.

FAQ

What is the maximum operating frequency supported by the SN74CBTLV3257D?

The SN74CBTLV3257D is characterized for operation up to 200 MHz, validated by measured propagation delay of 0.15–0.25 ns at 2.5 V and 0.18–0.22 ns at 3.3 V. Performance depends on trace impedance, load capacitance (<30 pF recommended), and proper V_CC decoupling - exceeding 200 MHz may cause timing margin erosion without layout optimization.

Does the SN74CBTLV3257D support level-shifting between different voltage domains?

Yes, the SN74CBTLV3257D supports rail-to-rail switching and tolerates input voltages up to 4.6 V regardless of V_CC setting, enabling level-shifting between 1.8 V, 2.5 V, and 3.3 V domains. However, V_CC must remain within 2.3–3.6 V; the device does not translate logic thresholds - it passes signals bi-directionally within its overvoltage-safe window.

How should the OE pin be handled during power-up to ensure reliable high-impedance state?

To guarantee high-impedance during power-up/down, OE must be tied to V_CC through an external pullup resistor. TI specifies minimum resistance based on driver sink capability - typically 4.7 kΩ to 10 kΩ suffices for most microcontroller GPIOs. Leaving OE floating risks undefined switching states and potential bus contention.

Can unused channels on the SN74CBTLV3257D be left unconnected?

No - unused A and B pins must be terminated to V_CC or GND to prevent floating inputs from causing increased ICC, noise coupling, or erratic switching. TI recommends tying idle A ports to GND and corresponding B1/B2 pairs to V_CC or GND depending on signal polarity requirements in the target application.

Is the SN74CBTLV3257D pin-compatible with other members of the CBTLV3257 family?

Yes, all CBTLV3257 variants - including SN74CBTLV3257D, SN74CBTLV3257PW, SN74CBTLV3257DGVR, and SN74CBTLV3257DBQR - share identical pin functions and logic behavior. Package-specific differences (SOIC vs. TSSOP vs. TVSOP) affect mechanical fit and thermal performance but not electrical interface or PCB layout compatibility at the signal layer.

SN74CBTLV3257D Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBTLV

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

Packaging:: Bulk

Product Status:: Obsolete

Type:: Multiplexer/Demultiplexer

Circuit:: 4 x 1:2

Independent Circuits:: 4

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 2.3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

SN74CBTLV3257D FAQ

1.How can I place an order for SN74CBTLV3257D through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CBTLV3257D 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 SN74CBTLV3257D reliable?

The price and inventory of SN74CBTLV3257D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3257D is usually 5 days.

3.What payment methods are accepted for SN74CBTLV3257D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTLV3257D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74CBTLV3257D?

SN74CBTLV3257D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CBTLV3257D 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 SN74CBTLV3257D?

For technical support, including SN74CBTLV3257D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3257D requirements.

6.How does Aetrix verify that SN74CBTLV3257D is sourced from the original manufacturer or authorized distributors?

All SN74CBTLV3257D 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 SN74CBTLV3257D meets industry standards.

7.What is the process for return or replacement of SN74CBTLV3257D?

All SN74CBTLV3257D units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3257D, 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 SN74CBTLV3257D part is unused and in its original packaging.

Return procedure for SN74CBTLV3257D:

1.Submit a request within 90 days.

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

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