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HomeProductsIntegrated Circuits (ICs)Logic - Signal Switches, Multiplexers, DecodersSN74CBT6845CPW
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SN74CBT6845CPW - Texas Instruments

Manufacturer Part Number
SN74CBT6845CPW
Manufacturer
Texas Instruments
Allelco Part Number
98D-SN74CBT6845CPW
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
49,434 pcs available, New & Original
Parts Description
IC BUS SWITCH 8 X 1:1 20TSSOP
Package
20-TSSOP
Data sheet
SN74CBT6845CPW.pdf

Datasheets

SN74CBT6845CDW.pdf

PCN Design/Specification

Design 22/Feb/2022.pdf

HTML Datasheet

SN74CBT6845CDW.pdf
RoHs Status
ROHS3 Compliant
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In stock: 49434
  • Unit Price: $0.551
  • Subtotal: $0.00

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Specifications

SN74CBT6845CPW Tech Specifications
Texas Instruments - SN74CBT6845CPW technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - SN74CBT6845CPW

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage Supply Source Single Supply
Voltage - Supply 4.5V ~ 5.5V
Type Bus Switch
Supplier Device Package 20-TSSOP
Series 74CBT
Package / Case 20-TSSOP (0.173", 4.40mm Width)
Product Attribute Attribute Value
Package Tube
Operating Temperature -40°C ~ 85°C
Mounting Type Surface Mount
Independent Circuits 1
Current - Output High, Low -
Circuit 8 x 1:1
Base Product Number 74CBT6845

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

How does the SN74CBT6845CPW perform in terms of signal integrity when switching between multiple 5V logic domains in a mixed-voltage system?
The SN74CBT6845CPW supports single-supply operation from 4.5V to 5.5V, making it suitable for 5V logic environments. Its bus switch architecture maintains low on-state resistance (typically <5Ω) across this voltage range, minimizing signal degradation during transitions. In mixed-voltage scenarios where isolation between domains is required, the device provides bidirectional signal routing without level shifting, preserving timing margins and reducing propagation delay compared to discrete solutions.
What are the key differences between the SN74CBT6845CPW and the SN74CBTV3845 in high-speed data path applications?
While both devices serve similar bus switching functions, the SN74CBTV3845 offers enhanced ESD protection (up to 8kV HBM) and operates over a broader temperature range (-40°C to 125°C), making it more suitable for industrial-grade systems. The SN74CBT6845CPW, with its tighter operating temperature specification (-40°C to 85°C) and standard package (20-TSSOP), provides cost-effective solutions for commercial applications where extreme environmental conditions are not expected.
Can the SN74CBT6845CPW safely interface between 3.3V and 5V logic families without additional level-shifting circuitry?
The SN74CBT6845CPW requires both ports to operate within its specified supply range of 4.5V to 5.5V. It cannot directly translate signals between 3.3V and 5V logic families because the input thresholds fall outside the 3.3V rail. Attempting such interfacing may result in undefined logic states or excessive current flow, potentially damaging either the device or the 3.3V-powered ICs connected to its outputs.
What is the typical propagation delay and how does it impact system timing when using the SN74CBT6845CPW in a 100MHz data bus?
The SN74CBT6845CPW exhibits a propagation delay of approximately 3.5ns at 5V VCC. For a 100MHz system with a 10ns clock period, this represents 35% of the available timing budget per switch stage. In multi-stage configurations, cumulative delays could violate setup and hold times, necessitating careful PCB layout and consideration of alternative architectures like parallel bus buffers with lower latency.
How should the enable pin be managed when only partial functionality of the SN74CBT6845CPW is needed in a design?
Each channel in the SN74CBT6845CPW shares a common enable pin (OE). To control individual channels, designers must use external logic gates or multiplexers. Alternatively, unused channels should have their inputs tied to valid logic levels through pull-up or pull-down resistors to prevent floating states that could cause excessive power consumption or unintended conduction.
What are the thermal considerations when deploying the SN74CBT6845CPW in compact embedded systems with limited airflow?
Operating the SN74CBT6845CPW at full load with all eight switches conducting simultaneously can generate up to 125mW of power dissipation. In tightly packed designs, this heat must be managed through adequate copper area on the PCB or by selecting switching patterns that minimize active time. The device’s MSL rating of 1 allows unlimited floor life, but long-term reliability under thermal stress still depends on proper board-level thermal management.
Does the SN74CBT6845CPW support hot-plugging applications commonly found in USB peripherals or expansion modules?
The SN74CBT6845CPW does not include integrated ESD protection diodes rated for hot-plug events. Without external transient voltage suppression components, repeated insertion into powered backplanes can expose the device to latch-up conditions or dielectric breakdown. Therefore, it is not recommended for direct hot-plug implementations without supplemental protection circuitry meeting IEC 61000-4-2 standards.
How does the SN74CBT6845CPW compare to FPGA-based soft-switching solutions in terms of power efficiency for intermittent data transfers?
For intermittent transfers, the SN74CBT6845CPW typically consumes less static power (less than 1µA off-state current) compared to FPGAs, which require continuous configuration memory refresh and baseline leakage currents in the milliwatt range. However, FPGA solutions offer greater flexibility and reduced component count for complex routing topologies. The optimal choice depends on transfer frequency: the SN74CBT6845CPW excels at infrequent switching, while FPGAs better suit variable or protocol-dependent routing needs.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments SN74CBT6845CPW

Product Attribute SN74CBT6845CPWR SN74CBT6845CDWR SN74CBT6845CDW SN74CBT6845CDWRG4
Part Number SN74CBT6845CPWR SN74CBT6845CDWR SN74CBT6845CDW SN74CBT6845CDWRG4
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Independent Circuits - - - -
Series - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Base Product Number - DAC34H84 MAX500 ADS62P42
Voltage - Supply - - - -
Circuit - - - -
Current - Output High, Low - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Type - - - -
Voltage Supply Source - - - -
Mounting Type - Surface Mount Through Hole Surface Mount

SN74CBT6845CPW Datasheet PDF

Download SN74CBT6845CPW pdf datasheets and Texas Instruments documentation for SN74CBT6845CPW - Texas Instruments.

Datasheets
SN74CBT6845CDW.pdf
PCN Design/Specification
Design 22/Feb/2022.pdf
HTML Datasheet
SN74CBT6845CDW.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

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Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
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SN74CBT6845CPW Image

SN74CBT6845CPW

Texas Instruments
98D-SN74CBT6845CPW

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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