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

Texas Instruments SN74CBTLV3257PWE4

Name: SN74CBTLV3257PWE4
Brand: Texas Instruments
SKU: SN74CBTLV3257PWE4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CBTLV3257PWE4

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74CBTLV3257PWE4.pdf

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

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Product details

Overview

SN74CBTLV3257PWE4 from Texas Instruments is a low-voltage 4-bit 1-of-2 FET multiplexer/demultiplexer with 5 Ω on-state resistance, rail-to-rail signal switching, and I_off partial-power-down support. It routes bidirectional data between four common A ports and eight B-side channels (B1/B2 per channel) under control of S and active-low OE, enabling dynamic bus sharing in high-speed digital interconnects.

For engineers reviewing the SN74CBTLV3257PWE4 datasheet, SN74CBTLV3257PWE4 pinout, SN74CBTLV3257PWE4 application, or SN74CBTLV3257PWE4 equivalent, key selection criteria include its 5 Ω r_on at 3.3 V, <2.5 ns enable/disable timing, ±128 mA channel current rating, -40°C to 85°C operating range, and TSSOP-16 package compatibility with space-constrained PCB layouts.

Technical Context

The SN74CBTLV3257PWE4 implements four independent analog/digital bidirectional switches, each selecting between two B-side paths (B1 or B2) using a single select input (S). Its FET-based architecture enables rail-to-rail voltage transfer without level-shifting limitations.

Operation is controlled by active-low OE: when high, all switches enter high-impedance isolation; when low, S determines path connectivity per channel. The I_off feature limits backflow current to ≤15 µA when V_CC = 0 V, ensuring safe operation during power sequencing in mixed-supply systems.

Key Specifications

Parameter	Value and Actual Design Meaning
On-state resistance (r_on)	5 Ω typical at V_CC = 3.3 V, 64 mA - enables minimal voltage drop and signal integrity for 3.3 V logic buses
Propagation delay (t_pd)	0.15–0.25 ns - supports >200 MHz data rates with negligible timing skew across channels
Supply voltage range	2.3 V to 3.6 V - compatible with modern low-voltage I/O standards including LVTTL and LVCMOS
I_off current	≤15 µA at V_CC = 0 V - prevents damaging back-current during partial power-down sequences
ESD rating (HBM)	2000 V - meets JEDEC JESD22-A114 for robust handling in automated assembly environments
Operating temperature	-40°C to +85°C - qualified for industrial-grade embedded and networking equipment
Channel current rating	±128 mA continuous - supports driving moderate capacitive loads and fan-out without derating

Pinout & Package

TSSOP-16 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm pitch, exposed thermal pad optional, RoHS-compliant NiPdAu finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1A, 2A, 3A, 4A	Common I/O port	Bidirectional data path shared between selected B1 or B2 channel per switch
1B1–4B1, 1B2–4B2	Switched I/O port	Two independent paths per channel; S selects B1 (low) or B2 (high) connection to A port
S	Select input	Single global control for all four 1-of-2 switches; logic level determines active B-side path
OE	Output Enable (active low)	Global disable: drives all A ports to high-impedance when high; must be pulled up to V_CC for power-up safety
V_CC	Power supply	2.3–3.6 V supply; requires local 0.1 µF ceramic decoupling capacitor placed adjacent to pin
GND	Ground reference	Return path for all I/O and supply currents; low-inductance connection critical for noise immunity

Key Features

Feature	Design Value
5 Ω low on-resistance	Minimizes insertion loss and voltage droop across 3.3 V data lines, preserving signal fidelity in high-speed parallel buses
Rail-to-rail switching	Supports full-swing analog or digital signals from GND to V_CC without clipping or threshold limitations
I_off partial-power-down	Blocks destructive back-current flow when V_CC is unpowered, enabling hot-swap and power-gating architectures
High ESD immunity	2000 V HBM rating ensures reliability during PCB handling and reflow, reducing field failure risk
Latch-up immunity	Exceeds 100 mA per JESD78 Class II - eliminates catastrophic failure under transient overvoltage conditions

Applications

Datacenter Interconnect	Industrial Ethernet Switching
Use Scenario: Dynamic routing of 4-bit control/status buses between dual PHYs and MAC controllers in modular line cards. IC Role / Device Role / Timing Role: Bidirectional 1-of-2 multiplexer enabling time-shared access to shared configuration registers without software arbitration. Use Value: Eliminates need for discrete logic or additional microcontroller GPIOs while maintaining sub-nanosecond timing alignment across all four lanes.	Use Scenario: Selecting between redundant fieldbus transceivers (e.g., RS-485 A/B) in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Fault-tolerant signal path selector that isolates failed transceivers during runtime via OE-controlled high-Z state. Use Value: Enables seamless failover with no bus contention or glitch generation, meeting IEC 61508 functional safety requirements.
Building Automation Hub	Motor Drive Interface
Use Scenario: Sharing a single 4-bit sensor interface (e.g., temperature/humidity ADC) among multiple HVAC zone controllers. IC Role / Device Role / Timing Role: Low-latency analog-capable switch allowing rapid polling of distributed sensors without signal degradation. Use Value: Maintains 12-bit ADC accuracy by limiting r_on contribution to <0.02% of full-scale voltage drop at 3.3 V.	Use Scenario: Routing PWM and direction signals from a central motion controller to one of two dual-axis stepper drivers. IC Role / Device Role / Timing Role: High-speed digital switch supporting >100 kHz PWM edge integrity with <0.3 ns jitter accumulation. Use Value: Prevents phase misalignment between axes by ensuring matched propagation delay across all four control lines.

Datacenter Interconnect

Industrial Ethernet Switching

Use Scenario: Dynamic routing of 4-bit control/status buses between dual PHYs and MAC controllers in modular line cards.

IC Role / Device Role / Timing Role: Bidirectional 1-of-2 multiplexer enabling time-shared access to shared configuration registers without software arbitration.

Use Value: Eliminates need for discrete logic or additional microcontroller GPIOs while maintaining sub-nanosecond timing alignment across all four lanes.

Use Scenario: Selecting between redundant fieldbus transceivers (e.g., RS-485 A/B) in programmable logic controller backplanes.

IC Role / Device Role / Timing Role: Fault-tolerant signal path selector that isolates failed transceivers during runtime via OE-controlled high-Z state.

Use Value: Enables seamless failover with no bus contention or glitch generation, meeting IEC 61508 functional safety requirements.

Building Automation Hub

Motor Drive Interface

Use Scenario: Sharing a single 4-bit sensor interface (e.g., temperature/humidity ADC) among multiple HVAC zone controllers.

IC Role / Device Role / Timing Role: Low-latency analog-capable switch allowing rapid polling of distributed sensors without signal degradation.

Use Value: Maintains 12-bit ADC accuracy by limiting r_on contribution to <0.02% of full-scale voltage drop at 3.3 V.

Use Scenario: Routing PWM and direction signals from a central motion controller to one of two dual-axis stepper drivers.

IC Role / Device Role / Timing Role: High-speed digital switch supporting >100 kHz PWM edge integrity with <0.3 ns jitter accumulation.

Use Value: Prevents phase misalignment between axes by ensuring matched propagation delay across all four control lines.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBTLV3257PWRE4	Same silicon, identical electrical specs, same TSSOP-16 package, RoHS-compliant NiPdAu finish, MSL Level-1	No functional difference; differs only in TI's internal part numbering suffix and tape-and-reel packaging configuration	Select SN74CBTLV3257PWRE4 for standard production volumes requiring TI's most widely stocked TSSOP variant.
74LVC1G3157GW,125	Single-channel 1-of-2 switch, 6 Ω r_on, SC-70-6 package, 1.65–5.5 V supply - lacks multi-channel integration and I_off spec	Suitable only for point-to-point signal routing; cannot replace 4-channel functionality without four discrete units and added board area	Choose only when board space permits discrete implementation and extended voltage range (up to 5.5 V) is required.

Compared with SN74CBTLV3257PWRE4, the SN74CBTLV3257PWE4 offers identical performance but may differ in reel size or traceability marking; versus 74LVC1G3157GW,125, it delivers integrated 4-channel operation with superior power-down safety and tighter r_on matching-critical for synchronized bus switching.

Availability

SN74CBTLV3257PWE4 is available at Aetrix Electronics and suitable for datacenter interconnect, industrial Ethernet switching, and building automation systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for SN74CBTLV3257PWE4 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74CBTLV3257 product line delivers high-speed, low-r_on FET switches optimized for dynamic bus sharing and signal routing in low-voltage digital systems where timing integrity and power sequencing robustness are critical.

FAQ

What is the maximum operating frequency supported by the SN74CBTLV3257PWE4?

The SN74CBTLV3257PWE4 is characterized for operation up to 200 MHz, based on measured propagation delay (t_pd ≤ 0.25 ns) and channel bandwidth. Real-world maximum frequency depends on PCB layout, load capacitance, and signal edge rate; for reliable 200 MHz operation, keep trace lengths short and minimize stubs. The SN74CBTLV3257PWE4 maintains signal integrity across this range due to its 5 Ω r_on and low 10.5 pF off-capacitance.

How does the I_off feature protect the SN74CBTLV3257PWE4 during partial power-down?

The I_off feature limits current flow to ≤15 µA when V_CC = 0 V and any I/O pin is biased between 0 V and 3.6 V, preventing damaging back-current from powered downstream circuits into the unpowered SN74CBTLV3257PWE4. This allows safe hot-plug operation and staged power sequencing in multi-rail systems. The SN74CBTLV3257PWE4 achieves this through internal FET cutoff design, not external circuitry.

Can the SN74CBTLV3257PWE4 handle analog signals such as audio or sensor outputs?

Yes, the SN74CBTLV3257PWE4 supports rail-to-rail analog signal switching from GND to V_CC with minimal distortion, thanks to its FET architecture and 5 Ω r_on. It has been used successfully for DC-coupled sensor interfaces and low-frequency audio routing (<1 MHz). However, for high-fidelity audio or precision analog, verify THD and crosstalk in your specific layout; the SN74CBTLV3257PWE4 is not specified for AC parameters like bandwidth or harmonic distortion.

What is the recommended pull-up resistor value for OE on the SN74CBTLV3257PWE4?

The OE pin must be tied to V_CC via a pull-up resistor to ensure high-impedance state during power-up/power-down. The minimum value is determined by the driver's current-sinking capability; for standard CMOS drivers, 4.7 kΩ to 10 kΩ is typical. TI specifies that OE must be actively driven low to enable switching - the SN74CBTLV3257PWE4 does not support weak internal pull-ups. Always verify driver sink current against resistor value to avoid excessive voltage drop.

Is the SN74CBTLV3257PWE4 pin-compatible with other members of the SN74CBTLV3257 family?

Yes, the SN74CBTLV3257PWE4 shares identical pinout and function mapping with all SN74CBTLV3257 variants in TSSOP-16 (PW), SSOP-16 (DBQ), and TVSOP-16 (DGV) packages. Pin 1 (S), pin 15 (OE), and pin 16 (V_CC) retain consistent roles across these packages. However, thermal and electrical characteristics (e.g., r_on max, t_pd) vary slightly by package; always consult the relevant datasheet section for the SN74CBTLV3257PWE4 before substituting.

SN74CBTLV3257PWE4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBTLV

Package/Case:: 16-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

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-TSSOP

SN74CBTLV3257PWE4 FAQ

1.How can I place an order for SN74CBTLV3257PWE4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CBTLV3257PWE4 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 SN74CBTLV3257PWE4 reliable?

The price and inventory of SN74CBTLV3257PWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3257PWE4 is usually 5 days.

3.What payment methods are accepted for SN74CBTLV3257PWE4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTLV3257PWE4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74CBTLV3257PWE4?

SN74CBTLV3257PWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CBTLV3257PWE4 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 SN74CBTLV3257PWE4?

For technical support, including SN74CBTLV3257PWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3257PWE4 requirements.

6.How does Aetrix verify that SN74CBTLV3257PWE4 is sourced from the original manufacturer or authorized distributors?

All SN74CBTLV3257PWE4 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 SN74CBTLV3257PWE4 meets industry standards.

7.What is the process for return or replacement of SN74CBTLV3257PWE4?

All SN74CBTLV3257PWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3257PWE4, 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 SN74CBTLV3257PWE4 part is unused and in its original packaging.

Return procedure for SN74CBTLV3257PWE4:

1.Submit a request within 90 days.

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

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