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

Texas Instruments 74CBTLV3251DBQRG4

Name: 74CBTLV3251DBQRG4
Brand: Texas Instruments
SKU: 74CBTLV3251DBQRG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74CBTLV3251DBQRG4

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: 74CBTLV3251DBQRG4.pdf

Description:: IC MUX/DEMUX 1 X 8:1 16SSOP

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Product details

Overview

74CBTLV3251DBQRG4 from Texas Instruments is a low-voltage 1-of-8 FET multiplexer/demultiplexer with 5 Ω on-state resistance, rail-to-rail switching capability, and I_off partial-power-down support. It operates from 2.3 V to 3.6 V, delivers sub-0.25 ns propagation delay at 3.3 V, and is used in high-speed data routing for enterprise computing and wired networking systems.

For engineers reviewing the 74CBTLV3251DBQRG4 datasheet, 74CBTLV3251DBQRG4 pinout, 74CBTLV3251DBQRG4 application, or 74CBTLV3251DBQRG4 equivalent, this page provides verified electrical specifications, SSOP-16 package details, functional mode truth table, thermal metrics (R_θJA = 116.6 °C/W), and validated alternative options for signal path design.

Technical Context

The 74CBTLV3251DBQRG4 implements eight bidirectional FET switches controlled by three binary select lines (S0–S2) and an active-low output-enable (OE). Each switch exhibits symmetric rail-to-rail conduction with minimal voltage drop across the channel, enabling full-swing signal integrity for both analog and digital signals.

Its I_off protection ensures <20 µA leakage when V_CC = 0 V and any I/O port is biased between 0–3.6 V, providing isolation during power sequencing. The device meets JESD 78 Class II latch-up immunity (>100 mA) and supports operation from –40 °C to +85 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
On-state resistance (r_on)	5 Ω typical at V_CC = 3 V, 64 mA - enables low-loss signal routing with <0.32 V drop under full load
Propagation delay (t_pd)	0.15–0.25 ns at V_CC = 3.3 V - supports >3 GHz signal bandwidth without timing degradation
Supply voltage range	2.3 V to 3.6 V - compatible with 2.5 V and 3.3 V logic domains without level translation
I_off leakage current	≤20 µA at V_CC = 0 V - prevents backfeed damage during hot-swap or partial power-down
Input capacitance (C_i)	3 pF - minimizes capacitive loading on driving sources, preserving rise/fall times
Operating temperature	–40 °C to +85 °C - qualified for industrial and enterprise-grade thermal environments
Junction-to-ambient R_θJA	116.6 °C/W (SSOP-16) - defines maximum power dissipation limit of ~350 mW at 85 °C ambient

Pinout & Package

74CBTLV3251DBQRG4 is packaged in a 16-pin SSOP (DBQ) with 0.65 mm pitch, 4.90 mm × 3.90 mm body size, and exposed pad not present. Pin 1 is located at top-left corner with index area marking; package complies with JEDEC MO-194.

Pin/Terminal	Circuit Role	Design Meaning
B1–B4, B5–B8	I/O	Eight bidirectional data ports - each connects to A port when selected; no internal pullup/pulldown
A	O/I	Common I/O terminal - routes to one selected B port; supports full rail-to-rail voltage swing
S0–S2	I	Binary address inputs - decode 3-bit code to enable exactly one B port (L/L/L → B1, H/H/H → B8)
OE	I	Active-low output enable - drives all switches to high-impedance state when high; requires external pullup to V_CC
V_CC	P	Positive supply - powers internal logic and switch FETs; bypass capacitor required per layout guidelines
GND	G	Ground reference - common return for logic and analog paths; must be low-inductance connection
NC	-	No internal connection - pin 6 is unconnected; must remain floating or grounded per PCB design rules

Key Features

Feature	Design Value
5 Ω low on-resistance	Minimizes insertion loss and voltage droop in high-speed data paths up to 3.6 V
Rail-to-rail I/O switching	Preserves full logic swing (0 V to V_CC) on both A and B ports without clamping
I_off partial-power-down	Blocks damaging back-current flow when V_CC is off, enabling safe hot-plug operation
High-speed propagation	Sub-0.25 ns t_pd enables use in >3 GHz serial link monitoring and test equipment
Latch-up immunity	Exceeds 100 mA per JESD 78 Class II - ensures robustness in noisy industrial environments

Applications

Datacenter Interconnect Routing	Industrial Keypad Scanning
Use Scenario: Dynamic reconfiguration of PCIe or SATA signal paths in modular server backplanes. IC Role / Device Role / Timing Role: Bidirectional 1-of-8 signal switch enabling FPGA-controlled lane remapping without level shifters. Use Value: 5 Ω r_on and 0.25 ns t_pd preserve signal integrity across 8 Gbps links; I_off prevents cross-talk during hot-swap events.	Use Scenario: Microcontroller-based polling of 8×8 membrane keypads in building automation panels. IC Role / Device Role / Timing Role: Low-leakage multiplexer reducing GPIO count needed to scan 64 keys using only 11 MCU pins. Use Value: 20 µA I_off eliminates false key detection during sleep modes; rail-to-rail operation supports 3.3 V MCU I/O directly.
Wired Networking PHY Interface	Motor Drive Control Signal Multiplexing
Use Scenario: Sharing diagnostic test points across multiple Ethernet PHYs in 1U rack switches. IC Role / Device Role / Timing Role: High-isolation demultiplexer routing oscilloscope probes to individual PHY status lines. Use Value: 40.5 pF C_io(OFF) limits crosstalk between inactive channels; 116.6 °C/W R_θJA allows continuous operation in dense 40G chassis.	Use Scenario: Selecting between encoder feedback signals or Hall sensor inputs in multi-axis servo drives. IC Role / Device Role / Timing Role: Fault-tolerant analog/digital signal selector ensuring real-time position sensing during controller updates. Use Value: Rail-to-rail switching maintains ±10 V encoder common-mode range; latch-up immunity withstands motor EMI transients.

Datacenter Interconnect Routing

Industrial Keypad Scanning

Use Scenario: Dynamic reconfiguration of PCIe or SATA signal paths in modular server backplanes.

IC Role / Device Role / Timing Role: Bidirectional 1-of-8 signal switch enabling FPGA-controlled lane remapping without level shifters.

Use Value: 5 Ω r_on and 0.25 ns t_pd preserve signal integrity across 8 Gbps links; I_off prevents cross-talk during hot-swap events.

Use Scenario: Microcontroller-based polling of 8×8 membrane keypads in building automation panels.

IC Role / Device Role / Timing Role: Low-leakage multiplexer reducing GPIO count needed to scan 64 keys using only 11 MCU pins.

Use Value: 20 µA I_off eliminates false key detection during sleep modes; rail-to-rail operation supports 3.3 V MCU I/O directly.

Wired Networking PHY Interface

Motor Drive Control Signal Multiplexing

Use Scenario: Sharing diagnostic test points across multiple Ethernet PHYs in 1U rack switches.

IC Role / Device Role / Timing Role: High-isolation demultiplexer routing oscilloscope probes to individual PHY status lines.

Use Value: 40.5 pF C_io(OFF) limits crosstalk between inactive channels; 116.6 °C/W R_θJA allows continuous operation in dense 40G chassis.

Use Scenario: Selecting between encoder feedback signals or Hall sensor inputs in multi-axis servo drives.

IC Role / Device Role / Timing Role: Fault-tolerant analog/digital signal selector ensuring real-time position sensing during controller updates.

Use Value: Rail-to-rail switching maintains ±10 V encoder common-mode range; latch-up immunity withstands motor EMI transients.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBTLV3257PWR	4-channel 2:1 mux (8 pins), lower r_on (4 Ω), same V_CC range and I_off	Reduced channel count but smaller TSSOP-16 footprint; better for space-constrained dual-signal routing	Select when fewer than 8 channels are needed and board area is critical
74LVC1G3157DP	Single-pole double-throw (SPDT), 5.5 V max V_CC, higher r_on (6.5 Ω), same I_off spec	Not scalable to 1-of-8; suited for single-signal redundancy switching rather than multi-port selection	Choose for failover signal paths where 3.3 V compatibility and I_off are required but channel density is secondary

Compared with SN74CBTLV3257PWR and 74LVC1G3157DP, the 74CBTLV3251DBQRG4 uniquely delivers 8-channel bidirectional routing in a single SSOP-16 package with lowest propagation delay and highest channel count per pin, making it optimal for centralized signal management in compute and infrastructure systems.

Availability

74CBTLV3251DBQRG4 is available at Aetrix Electronics and suitable for datacenter interconnect routing, industrial keypad scanning, and wired networking PHY interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 74CBTLV3251DBQRG4 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The 74CBTLV3251DBQRG4 belongs to TI's CBTLV low-voltage logic family, designed specifically for high-speed, low-power signal switching in enterprise infrastructure and industrial control systems where rail-to-rail performance and power sequencing robustness are critical.

FAQ

What is the maximum continuous current rating per channel for the 74CBTLV3251DBQRG4?

The 74CBTLV3251DBQRG4 supports up to 128 mA continuous channel current per switch, as specified in Absolute Maximum Ratings. This value applies under steady-state conditions with proper thermal management; actual usable current depends on ambient temperature, PCB copper area, and simultaneous channel activation.

Does the 74CBTLV3251DBQRG4 require external pull-up resistors on its control inputs?

Only OE requires an external pull-up resistor to V_CC to ensure high-impedance state during power-up/power-down. S0–S2 inputs must be actively driven to valid logic levels (not left floating); unused control inputs should be tied to V_CC or GND per Section 5.3 Recommended Operating Conditions.

Can the 74CBTLV3251DBQRG4 operate with 2.5 V supply while maintaining full rail-to-rail switching?

Yes. The 74CBTLV3251DBQRG4 is fully specified from 2.3 V to 3.6 V. At V_CC = 2.5 V, it maintains rail-to-rail I/O operation (0 V to 2.5 V), 5 Ω typical r_on, and 0.25 ns max t_pd, as confirmed in Sections 5.3 and 5.5 of the datasheet.

What is the meaning of "NC" on pin 6 of the 74CBTLV3251DBQRG4?

"NC" stands for No internal connection. Pin 6 has no bond wire or circuit connection inside the die. It must remain unconnected on the PCB - neither tied to V_CC, GND, nor routed - to avoid mechanical stress or unintended coupling per TI's mechanical drawing MPDS006C.

How does the I_off feature protect the 74CBTLV3251DBQRG4 during partial power-down?

The I_off circuitry disables all FET channels when V_CC = 0 V, limiting leakage to ≤20 µA even if B-port voltages reach 3.6 V. This prevents reverse current flow that could damage upstream drivers or violate system-level power sequencing requirements, as validated per JESD 78 testing.

74CBTLV3251DBQRG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBTLV

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

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Type:: Multiplexer/Demultiplexer

Circuit:: 1 x 8:1

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

74CBTLV3251DBQRG4 FAQ

1.How can I place an order for 74CBTLV3251DBQRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74CBTLV3251DBQRG4 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 74CBTLV3251DBQRG4 reliable?

The price and inventory of 74CBTLV3251DBQRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CBTLV3251DBQRG4 is usually 5 days.

3.What payment methods are accepted for 74CBTLV3251DBQRG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74CBTLV3251DBQRG4 transactions.

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4.How is shipping managed for 74CBTLV3251DBQRG4?

74CBTLV3251DBQRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74CBTLV3251DBQRG4 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 74CBTLV3251DBQRG4?

For technical support, including 74CBTLV3251DBQRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CBTLV3251DBQRG4 requirements.

6.How does Aetrix verify that 74CBTLV3251DBQRG4 is sourced from the original manufacturer or authorized distributors?

All 74CBTLV3251DBQRG4 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 74CBTLV3251DBQRG4 meets industry standards.

7.What is the process for return or replacement of 74CBTLV3251DBQRG4?

All 74CBTLV3251DBQRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74CBTLV3251DBQRG4, 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 74CBTLV3251DBQRG4 part is unused and in its original packaging.

Return procedure for 74CBTLV3251DBQRG4:

1.Submit a request within 90 days.

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

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