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

Texas Instruments SN74CBT3126PWR

Name: SN74CBT3126PWR
Brand: Texas Instruments
SKU: SN74CBT3126PWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CBT3126PWR

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74CBT3126PWR.pdf

Description:: IC BUS SWITCH 1 X 1:1 14TSSOP

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Product details

Overview

SN74CBT3126PWR from Texas Instruments is a quadruple FET bus switch IC with independent 5-Ω bidirectional analog/digital signal paths, TTL-compatible control inputs, and 4.0–5.5 V supply operation. It enables or isolates four A↔B data lines per channel under individual OE control, supporting hot-swap and level-translating applications in memory expansion, peripheral multiplexing, and test equipment interface boards.

For engineers reviewing the SN74CBT3126PWR datasheet, SN74CBT3126PWR pinout, SN74CBT3126PWR application, or SN74CBT3126PWR equivalent, key selection criteria include on-state resistance (5–7 Ω), propagation delay (0.25–0.35 ns), latch-up immunity (>250 mA), and TSSOP-14 package compatibility with high-density PCB layouts.

Technical Context

This device implements four independent single-pole single-throw (SPST) FET switches using NMOS pass transistors with integrated charge pumps to ensure low and symmetric on-resistance across input voltage ranges. Each channel operates bidirectionally with no intrinsic directionality, and the OE control logic follows active-high polarity with TTL-level thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2 V).

Designed for 4.0–5.5 V operation, it features rail-to-rail analog switching capability, 4 pF off-state capacitance (C_io(OFF)), and sub-1 ns enable/disable timing (t_en/t_dis ≤ 5.4 ns). Its latch-up robustness exceeds JESD17 Class II (250 mA), and absolute maximum ratings permit transient overvoltage up to ±0.5 V beyond rails.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage (V_CC)	4.0–5.5 V - Ensures compatibility with 5 V TTL and mixed-voltage systems without level shifters.
On-State Resistance (r_on)	5–7 Ω at V_CC = 4.5 V - Minimizes signal attenuation and distortion for digital and analog signals up to 128 mA per channel.
Propagation Delay (t_pd)	0.25–0.35 ns - Enables use in high-speed data paths including address/data bus isolation in microcontroller peripherals.
Off-State Capacitance (C_io(OFF))	4 pF - Reduces crosstalk and loading on adjacent traces in dense routing environments.
Latch-Up Immunity	>250 mA per JESD17 - Guarantees robust operation during power sequencing, hot insertion, and ESD events.
Input Compatibility	TTL-level (V_IL ≤ 0.8 V, V_IH ≥ 2 V) - Directly interfaces with legacy 5 V logic families without pull-up resistors.
Operating Temperature	−40°C to +85°C - Supports industrial-grade deployment in embedded controllers and communications hardware.

Pinout & Package

TSSOP-14 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, exposed pad optional, JEDEC MO-153 compliant.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE, 3OE, 4OE	Channel enable inputs	Active-high TTL-compatible controls; each independently gates one A↔B switch pair.
1A–4A, 1B–4B	Switch I/O terminals	Bidirectional signal ports; no internal directionality-A and B are electrically symmetric.
GND (Pin 7)	Power reference	Primary ground return for all channels and internal bias circuitry; must be low-impedance.
V_CC (Pin 14)	Supply rail	Provides operating voltage for FET gate drive and internal logic; bypassing with 0.1 µF near pin is recommended.

Key Features

Feature	Design Value
Low on-resistance	5–7 Ω ensures minimal voltage drop and signal integrity for 128 mA DC loads and high-frequency digital waveforms.
Bi-directional analog/digital switching	No internal directionality-supports seamless integration into both data bus and analog sensor multiplexing paths.
Fast enable/disable timing	t_en/t_dis ≤ 5.4 ns enables precise gating of high-speed signals without pulse distortion or glitches.
High noise immunity	Input hysteresis and TTL thresholds prevent false triggering in electrically noisy industrial environments.
Hot-swap compatible	Controlled power-up behavior with OE pulldown recommendation prevents undefined states during supply ramp.

Applications

Memory Expansion Interface	Peripheral Multiplexer
Use Scenario: Isolating multiple SRAM or Flash devices sharing a common data/address bus on an MCU-based controller board. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-multiplexed access while preventing contention between memory chips. Use Value: Eliminates need for tristate buffers or complex arbitration logic; maintains signal fidelity with <0.35 ns delay and 5 Ω r_on.	Use Scenario: Sharing a single UART or SPI interface among multiple sensors or actuators in an industrial PLC module. IC Role / Device Role / Timing Role: Channel-selectable signal path router controlled by MCU GPIOs to dynamically assign serial resources. Use Value: Reduces component count versus discrete MOSFET solutions; supports hot-plug reconfiguration without system reset.
Test Equipment Signal Routing	Level-Translation Interface
Use Scenario: Programmable interconnection matrix in automated test equipment (ATE) for routing DUT signals to measurement instruments. IC Role / Device Role / Timing Role: Low-capacitance (4 pF), low-r_on switch enabling clean signal transfer across multiple instrument channels. Use Value: Preserves rise/fall times and minimizes crosstalk in multi-channel parallel test configurations.	Use Scenario: Bridging 3.3 V FPGA I/O banks to legacy 5 V peripheral ICs in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Passive bidirectional level shifter leveraging inherent FET conduction characteristics without external bias. Use Value: No external components required; supports full-speed operation up to 100+ MHz due to sub-1 ns timing.

Memory Expansion Interface

Peripheral Multiplexer

Use Scenario: Isolating multiple SRAM or Flash devices sharing a common data/address bus on an MCU-based controller board.

IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-multiplexed access while preventing contention between memory chips.

Use Value: Eliminates need for tristate buffers or complex arbitration logic; maintains signal fidelity with <0.35 ns delay and 5 Ω r_on.

Use Scenario: Sharing a single UART or SPI interface among multiple sensors or actuators in an industrial PLC module.

IC Role / Device Role / Timing Role: Channel-selectable signal path router controlled by MCU GPIOs to dynamically assign serial resources.

Use Value: Reduces component count versus discrete MOSFET solutions; supports hot-plug reconfiguration without system reset.

Test Equipment Signal Routing

Level-Translation Interface

Use Scenario: Programmable interconnection matrix in automated test equipment (ATE) for routing DUT signals to measurement instruments.

IC Role / Device Role / Timing Role: Low-capacitance (4 pF), low-r_on switch enabling clean signal transfer across multiple instrument channels.

Use Value: Preserves rise/fall times and minimizes crosstalk in multi-channel parallel test configurations.

Use Scenario: Bridging 3.3 V FPGA I/O banks to legacy 5 V peripheral ICs in mixed-voltage embedded systems.

IC Role / Device Role / Timing Role: Passive bidirectional level shifter leveraging inherent FET conduction characteristics without external bias.

Use Value: No external components required; supports full-speed operation up to 100+ MHz due to sub-1 ns timing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBTD3384PWR	Octal configuration, higher r_on (7–10 Ω), requires V_CC ≥ 4.5 V for guaranteed TTL compatibility.	Higher channel density but larger footprint (20-pin TSSOP); less suitable for space-constrained 4-channel designs.	Choose when expanding to eight isolated paths is needed and board area permits larger package.
74LVC1G3157DPWR	Single-channel, lower r_on (3–5 Ω), 1.65–5.5 V operation, smaller 6-pin X2SON package.	Requires four separate devices for quad functionality; better for ultra-low-power or distributed switching topologies.	Prefer when design flexibility, lowest possible r_on, or 1.8 V logic compatibility is prioritized over integration.

Compared with SN74CBT3126PWR, SN74CBTD3384PWR offers greater channel count at the cost of layout efficiency, while 74LVC1G3157DPWR trades integration for wider voltage range and finer granularity-neither is pin-compatible, but both serve overlapping signal-routing functions in modern digital systems.

Availability

SN74CBT3126PWR is available at Aetrix Electronics and suitable for memory expansion interfaces, peripheral multiplexing, test equipment signal routing, and level-translation interfaces requiring stable component supply and long-term industrial availability.

Supply support for SN74CBT3126PWR 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 experience in high-reliability logic and interface solutions.

The SN74CBT3126PWR belongs to TI's CBT (Crossbar Bus Transceiver) family, engineered for low-latency, low-distortion signal routing in high-speed digital systems where deterministic timing and rail-to-rail analog transparency are critical.

FAQ

What is the maximum continuous current per channel for SN74CBT3126PWR?

The SN74CBT3126PWR supports up to 128 mA continuous channel current per switch path. This rating is specified under recommended operating conditions (V_CC = 4–5.5 V, T_A = −40°C to +85°C) and reflects the maximum DC current the internal FET can sustain without exceeding thermal limits or degrading r_on. Exceeding this value risks parametric shift or long-term reliability impact.

Does SN74CBT3126PWR require external pull-down resistors on OE pins?

Yes-TI recommends tying each OE input to GND via a pulldown resistor during power-up/down to guarantee high-impedance state before control logic stabilizes. The minimum resistor value depends on the driver's current-sourcing capability; typical values range from 1 kΩ to 10 kΩ. Leaving OE floating may cause unintended channel activation and bus contention.

Can SN74CBT3126PWR be used for analog signal switching?

Yes-the SN74CBT3126PWR supports bidirectional analog signal routing due to its symmetric FET structure and rail-to-rail conduction. It maintains low distortion for signals within the V_CC–GND range (e.g., 0–5 V), with 4 pF off-capacitance and 5–7 Ω on-resistance making it suitable for audio, sensor, and low-frequency analog multiplexing up to ~10 MHz bandwidth.

What is the thermal resistance (θ_JA) of SN74CBT3126PWR in its TSSOP-14 package?

The SN74CBT3126PWR in the PW (TSSOP-14) package has a junction-to-ambient thermal resistance (θ_JA) of 113°C/W, measured per JESD51-7. This value assumes standard JEDEC 2S2P test board conditions; actual performance improves with PCB copper area, thermal vias under the exposed pad (if present), and airflow. For sustained 128 mA per channel, temperature rise remains within safe limits at typical ambient conditions.

Is SN74CBT3126PWR RoHS compliant and lead-free?

Yes-SN74CBT3126PWR is RoHS compliant and features NiPdAu (NIPDAU) lead finish. Per TI's packaging addendum, it carries MSL Level-1 (unlimited floor life at ≤30°C/60% RH) and is rated for peak reflow of 260°C. The "Active" status confirms ongoing production and full compliance with EU RoHS Directive 2011/65/EU and China RoHS.

SN74CBT3126PWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBT

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Bus Switch

Circuit:: 1 x 1:1

Independent Circuits:: 4

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:: 14-TSSOP

SN74CBT3126PWR FAQ

1.How can I place an order for SN74CBT3126PWR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CBT3126PWR 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 SN74CBT3126PWR reliable?

The price and inventory of SN74CBT3126PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3126PWR is usually 5 days.

3.What payment methods are accepted for SN74CBT3126PWR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3126PWR transactions.

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4.How is shipping managed for SN74CBT3126PWR?

SN74CBT3126PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CBT3126PWR 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 SN74CBT3126PWR?

For technical support, including SN74CBT3126PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3126PWR requirements.

6.How does Aetrix verify that SN74CBT3126PWR is sourced from the original manufacturer or authorized distributors?

All SN74CBT3126PWR 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 SN74CBT3126PWR meets industry standards.

7.What is the process for return or replacement of SN74CBT3126PWR?

All SN74CBT3126PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3126PWR, 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 SN74CBT3126PWR part is unused and in its original packaging.

Return procedure for SN74CBT3126PWR:

1.Submit a request within 90 days.

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

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