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

Texas Instruments SN74CBT6800DW

Name: SN74CBT6800DW
Brand: Texas Instruments
SKU: SN74CBT6800DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CBT6800DW

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 24-SOIC (0.295", 7.50mm Width)

Datasheet:: SN74CBT6800DW.pdf

Description:: IC 10-BIT FET BUS SW 24-SOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SN74CBT6800DW from Texas Instruments is a 10-bit TTL-compatible bus switch with precharged B-port outputs for live insertion, 5-Ω on-state resistance, ±128 mA continuous channel current, and operation from –40°C to 85°C. It enables bidirectional signal routing between A and B ports under single ON control in industrial backplane and hot-swap subsystems.

For engineers reviewing the SN74CBT6800DW datasheet, SN74CBT6800DW pinout, SN74CBT6800DW application, or SN74CBT6800DW equivalent, key selection criteria include live-insertion noise suppression via user-selectable BIASV bias voltage, sub-nanosecond propagation delay (0.25 ns), and DW-package thermal performance (1.7 W max at 55°C).

Technical Context

The SN74CBT6800DW implements a single-enable 10-bit analog bus switch architecture with low-resistance MOSFET-based pass gates. Its on-state resistance (5–7 Ω typical) ensures minimal signal attenuation and near-zero propagation delay (0.25 ns) across A↔B paths under 50-pF load conditions.

During disable (ON = high), the B port is actively precharged to a user-supplied BIASV voltage (1.3 V to VCC) through an internal ~10-kΩ equivalent resistor, suppressing floating-node transients during hot-plug events. Input and output levels are TTL-compatible, supporting direct interfacing with legacy logic families without level translation.

Key Specifications

Parameter	Value and Actual Design Meaning
On-state resistance (r_ON)	5–7 Ω at V_CC = 4.5 V - ensures minimal voltage drop and signal distortion for 3.3 V/5 V digital buses
Propagation delay (t_pd)	0.25 ns - enables high-speed data transfer without timing budget impact in >1 GHz clock domains
BIASV range	1.3 V to V_CC - allows precise precharge voltage selection to match system I/O thresholds and reduce ground bounce
Continuous channel current	±128 mA - supports robust drive capability for heavily loaded backplane traces or stubbed interconnects
Operating temperature	–40°C to 85°C - qualified for industrial-grade embedded systems and telecom line cards
Supply voltage (V_CC)	4 V to 5.5 V - compatible with standard 5 V logic rails and tolerant of supply droop
Input clamp current	–50 mA - protects against negative transient overvoltage during live insertion

Pinout & Package

SN74CBT6800DW is housed in a 24-pin SOIC (Small-Outline Integrated Circuit) package, designated DW by Texas Instruments. This surface-mount package measures 7.5 mm × 15.4 mm with 1.27 mm lead pitch and provides full thermal derating up to 1.7 W at 55°C ambient.

Pin/Terminal	Circuit Role	Design Meaning
ON (Pin 1)	Enable control input	Active-low logic signal enabling/disabling all 10 A↔B switches simultaneously
A1–A10 (Pins 2–11)	Port A data inputs/outputs	Bidirectional TTL-compatible terminals connected directly to upstream logic or controller
GND (Pin 12)	Ground reference	Primary return path for switch current and bias network; must be low-inductance connection
V_CC (Pin 13)	Power supply	Provides operating voltage for internal logic and switch bias circuitry; bypassing required
B1–B10 (Pins 14–23)	Port B data inputs/outputs	Bidirectional terminals precharged to BIASV when disabled; connect to hot-swappable modules
BIASV (Pin 24)	Bias voltage input	User-supplied voltage (1.3 V to V_CC) setting precharge level for B-port during disable state

Key Features

Feature	Design Value
Precharged B-port outputs	Reduces live-insertion noise by holding B1–B10 at stable BIASV instead of floating, eliminating bus contention during hot-plug
Low 5–7 Ω on-state resistance	Minimizes insertion loss and maintains signal integrity for high-speed parallel buses up to 100 MHz
TTL-compatible I/O levels	Direct interface with 74LS, 74ALS, and other legacy logic families without external level shifters
Single ON enable control	Simplifies PCB layout and firmware control by consolidating 10-channel switching into one GPIO signal
–40°C to 85°C operation	Validated performance across extended industrial temperature range for telecom and factory automation use

Applications

Backplane Interconnect	Hot-Swappable Module Interface
Use Scenario: Isolating add-in cards from main chassis backplane during insertion/removal in modular servers. IC Role / Device Role / Timing Role: Bidirectional bus switch controlling data path between card-edge connector (B port) and motherboard bus (A port). Use Value: Precharged B-port prevents floating signals and ground bounce on shared backplane lines during hot-swap events.	Use Scenario: Enabling/disabling communication between a CPU board and field-replaceable peripheral module (e.g., sensor hub or I/O expander). IC Role / Device Role / Timing Role: Signal isolation gate with controlled enable timing and bias-controlled B-port termination. Use Value: Eliminates bus contention and ESD-induced latch-up risk when modules are inserted under power.
Legacy System Bus Expansion	Industrial Control Data Multiplexing
Use Scenario: Adding new peripherals to aging PLC or CNC controller using original 5 V TTL bus architecture. IC Role / Device Role / Timing Role: Level-consistent bus extender preserving timing margins and fan-out capability. Use Value: 0.25 ns propagation delay and 5 Ω r_ON maintain setup/hold timing for 20+ MHz parallel address/data buses.	Use Scenario: Routing sensor readings from multiple analog front-ends to a shared ADC interface in programmable logic controllers. IC Role / Device Role / Timing Role: Low-distortion analog/digital multiplexer with fast enable/disable transitions. Use Value: Sub-1 ns switching ensures clean sampling windows and avoids crosstalk-induced measurement error.

Backplane Interconnect

Hot-Swappable Module Interface

Use Scenario: Isolating add-in cards from main chassis backplane during insertion/removal in modular servers.

IC Role / Device Role / Timing Role: Bidirectional bus switch controlling data path between card-edge connector (B port) and motherboard bus (A port).

Use Value: Precharged B-port prevents floating signals and ground bounce on shared backplane lines during hot-swap events.

Use Scenario: Enabling/disabling communication between a CPU board and field-replaceable peripheral module (e.g., sensor hub or I/O expander).

IC Role / Device Role / Timing Role: Signal isolation gate with controlled enable timing and bias-controlled B-port termination.

Use Value: Eliminates bus contention and ESD-induced latch-up risk when modules are inserted under power.

Legacy System Bus Expansion

Industrial Control Data Multiplexing

Use Scenario: Adding new peripherals to aging PLC or CNC controller using original 5 V TTL bus architecture.

IC Role / Device Role / Timing Role: Level-consistent bus extender preserving timing margins and fan-out capability.

Use Value: 0.25 ns propagation delay and 5 Ω r_ON maintain setup/hold timing for 20+ MHz parallel address/data buses.

Use Scenario: Routing sensor readings from multiple analog front-ends to a shared ADC interface in programmable logic controllers.

IC Role / Device Role / Timing Role: Low-distortion analog/digital multiplexer with fast enable/disable transitions.

Use Value: Sub-1 ns switching ensures clean sampling windows and avoids crosstalk-induced measurement error.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBTD6800DW	Includes bus-hold circuitry on B-port; higher ICC (100 µA vs. 50 µA); same r_ON and timing	Eliminates need for external pull-ups on B-port but increases quiescent current	Choose when B-port nodes require deterministic idle-state logic levels without external resistors
74CBTLV6800PW	Lower V_CC range (2.3–3.6 V); 3.3 V only; smaller PW package; 4 Ω r_ON	Designed for low-voltage portable or battery-powered systems, not 5 V industrial backplanes	Choose only for 3.3 V systems requiring reduced power and footprint; not a drop-in replacement for SN74CBT6800DW

Compared with SN74CBT6800DW, SN74CBTD6800DW adds bus-hold functionality at the cost of higher supply current, while 74CBTLV6800PW targets 3.3 V operation with improved r_ON but incompatible voltage range and package thermal profile.

Availability

SN74CBT6800DW is available at Aetrix Electronics and suitable for industrial backplane interconnect, hot-swap module interfaces, and legacy TTL bus expansion requiring stable component supply and long-term lifecycle support.

Supply support for SN74CBT6800DW 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74CBT6800DW belongs to TI's CBT (Crossbar Bus Transceiver) family, designed specifically for high-speed, low-distortion signal routing in live-insertion-capable systems with strict noise and timing requirements.

FAQ

What is the maximum allowable BIASV voltage for the SN74CBT6800DW?

The SN74CBT6800DW specifies a BIASV range of 1.3 V to V_CC, with absolute maximum rating of –0.5 V to 6 V. For reliable operation, BIASV must not exceed the applied V_CC voltage. At V_CC = 5.5 V, BIASV may be set up to 5.5 V; exceeding this risks damage to internal precharge circuitry. Always reference the recommended operating conditions table in the SCDS005G datasheet for design margin.

Can the SN74CBT6800DW operate with a 3.3 V supply?

No, the SN74CBT6800DW is not rated for 3.3 V operation. Its recommended V_CC range is 4 V to 5.5 V, and minimum functional V_CC is 4 V per the datasheet. Attempting 3.3 V operation results in undefined switching behavior, increased r_ON, and potential failure to meet timing or drive specifications. For 3.3 V systems, consider TI's 74CBTLV6800PW instead.

How does the SN74CBT6800DW suppress noise during live insertion?

The SN74CBT6800DW suppresses live-insertion noise by precharging its B-port outputs (B1–B10) to a user-defined BIASV voltage via an internal ~10-kΩ resistor when the ON pin is high. This prevents B-port pins from floating, eliminating ground bounce, bus contention, and ESD-triggered latch-up during hot-plug events-critical for modular telecom and industrial systems.

What is the thermal performance difference between DW and DB packages for the SN74CBT6800DW?

The DW package (SOIC) has a maximum power dissipation of 1.7 W at 55°C ambient, significantly higher than the DB (shrink SOIC) package's 0.6 W rating. This makes the SN74CBT6800DW more suitable for thermally demanding applications where sustained current flow or limited airflow exists, such as dense backplane slots or enclosed industrial enclosures.

Is the SN74CBT6800DW pin-compatible with other 24-pin bus switches like the SN74CBT3245?

No, the SN74CBT6800DW is not pin-compatible with SN74CBT3245. The SN74CBT6800DW uses a dedicated 10-bit A/B architecture with ON enable and BIASV bias input (Pin 24), whereas SN74CBT3245 is an octal switch with dual OE controls and no BIASV pin. Pin mapping, function allocation, and package pinout differ fundamentally-PCB redesign is required for substitution.

SN74CBT6800DW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBT

Package/Case:: 24-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Type:: FET Bus Switch

Circuit:: 10 x 1:1

Independent Circuits:: 1

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-SOIC

SN74CBT6800DW FAQ

1.How can I place an order for SN74CBT6800DW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CBT6800DW 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 SN74CBT6800DW reliable?

The price and inventory of SN74CBT6800DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800DW is usually 5 days.

3.What payment methods are accepted for SN74CBT6800DW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT6800DW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74CBT6800DW?

SN74CBT6800DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CBT6800DW 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 SN74CBT6800DW?

For technical support, including SN74CBT6800DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800DW requirements.

6.How does Aetrix verify that SN74CBT6800DW is sourced from the original manufacturer or authorized distributors?

All SN74CBT6800DW 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 SN74CBT6800DW meets industry standards.

7.What is the process for return or replacement of SN74CBT6800DW?

All SN74CBT6800DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800DW, 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 SN74CBT6800DW part is unused and in its original packaging.

Return procedure for SN74CBT6800DW:

1.Submit a request within 90 days.

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

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