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HomeProductsIntegrated Circuits (ICs)Logic - Signal Switches, Multiplexers, DecodersSN74CBT6845CDW
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SN74CBT6845CDW - Texas Instruments

Manufacturer Part Number
SN74CBT6845CDW
Manufacturer
Texas Instruments
Allelco Part Number
98D-SN74CBT6845CDW
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
7,913 pcs available, New & Original
Parts Description
IC BUS SWITCH 8 X 1:1 20SOIC
Package
20-SOIC
Data sheet
SN74CBT6845CDW.pdf

Datasheets

SN74CBT6845CDW.pdf

HTML Datasheet

SN74CBT6845CDW.pdf
RoHs Status
ROHS3 Compliant
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Specifications

SN74CBT6845CDW Tech Specifications
Texas Instruments - SN74CBT6845CDW technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - SN74CBT6845CDW

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-SOIC
Series 74CBT
Package / Case 20-SOIC (0.295", 7.50mm 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 SN74CBT6845CDW handle bidirectional signal switching across its 8 channels in a single-supply system operating at 5V, and what design considerations are necessary to maintain signal integrity?
The SN74CBT6845CDW functions as an 8-channel bidirectional bus switch designed for single-supply operation within a 4.5V to 5.5V range, making it ideal for 5V logic systems. Each of the eight 1:1 switches allows full-duplex data flow in both directions without polarity constraints, which is essential for modern digital buses like I²C, SPI, or GPIO expansion. To preserve signal integrity during high-speed transitions, designers should ensure minimal trace length mismatch between channels and avoid loading the output beyond the device’s specified drive capability. Given its 20-SOIC package and surface-mount design, layout parasitics must be minimized through proper grounding and decoupling—typically a 0.1µF capacitor near VCC and GND pins—to suppress noise and prevent oscillation in dynamic switching environments.
What are the key differences in performance and application suitability between the SN74CBT6845CDW and a standard analog multiplexer such as the CD4051BE when used in a microcontroller-based peripheral switching scenario?
While both the SN74CBT6845CDW and CD4051BE serve routing functions, their architectures differ significantly in bandwidth, channel count, and control logic. The SN74CBT6845CDW supports eight independent bidirectional switches with near-zero propagation delay (~3ns typical), optimized for fast digital signal paths in synchronous systems. In contrast, the CD4051BE is an 8:1 analog multiplexer requiring external logic for directionality and limited to lower-frequency analog signals due to higher on-resistance (typically 100Ω vs. ~5Ω for the CBT6845). Additionally, the CBT6845 operates from 4.5–5.5V, aligning with 5V CMOS logic families, whereas the CD4051 works over a wider supply range but lacks built-in level shifting or hot-swapping protection. For digital bus isolation or expansion in embedded systems, the CBT6845 offers superior speed, lower distortion, and integrated enable control via OE pin.
Can the SN74CBT6845CDW be used safely in automotive-grade applications, and what environmental or operational risks should be evaluated before integrating it into a production design?
No, the SN74CBT6845CDW is not qualified for automotive use. It operates only from -40°C to +85°C, which falls short of AEC-Q100 Grade 2 requirements (typically -40°C to +105°C) needed for most automotive systems. While it may function adequately in industrial or consumer electronics under controlled conditions, exposure to elevated temperatures, thermal cycling, or humidity beyond MSL 1 handling limits could degrade reliability over time. Designers considering harsh environments should evaluate alternative TI devices with extended temperature ratings or implement derating strategies—such as reducing switching frequency or ensuring airflow—to mitigate stress. Additionally, although RoHS3 compliant, the component lacks functional safety certifications required for mission-critical automotive subsystems, making it unsuitable for direct deployment in powertrain, ADAS, or infotainment domains without additional isolation layers.
When designing a PCB layout for multiple SN74CBT6845CDW chips connected to a shared bus, how should the OE (output enable) pins be managed to prevent contention or back-driving issues?
To avoid bus contention when using multiple SN74CBT6845CDW devices on a common net, each chip’s OE pin must be driven by independent control signals rather than tied together unless all devices are guaranteed to be simultaneously enabled or disabled. If parallel switching is required, use open-drain or tri-state buffers on the OE lines to stagger activation and ensure only one driver asserts high at any time. Alternatively, implement a priority-encoded enable scheme where higher-priority peripherals gain access first. Back-driving risk arises if outputs are left floating while another device drives the same line high; thus, enabling one switch at a time reduces shoot-through current. Proper termination (e.g., series resistors of 22–100Ω near drivers) also minimizes reflections in long traces. Ground plane continuity beneath the ICs further reduces ground bounce and improves noise immunity during simultaneous switching events.
What is the maximum recommended capacitive load per output of the SN74CBT6845CDW, and how does this affect system-level timing margins in high-fanout configurations?
Although the datasheet does not specify an explicit maximum capacitive load, practical applications suggest keeping total output capacitance below 20pF per channel to maintain stable operation and avoid excessive rise/fall times. Exceeding this can increase propagation delay beyond 10ns, potentially violating setup/hold windows in tight clock budgets. In high-fanout scenarios—such as driving multiple inputs or long PCB traces—each additional load adds parasitic capacitance that degrades edge rates and increases power dissipation. Designers often insert small series resistors (22–56Ω) close to the output to dampen ringing and reduce electromagnetic interference (EMI), effectively isolating the switch from downstream loads. This damping technique trades slight delay increase for improved signal fidelity, especially beneficial when interfacing with mixed-voltage domains or sensitive analog circuits.
How does the SN74CBT6845CDW compare to newer generations like the SN74CBTLV6845ADW in terms of voltage compatibility, power consumption, and suitability for mixed-voltage interfaces?
The SN74CBT6845CDW is a legacy CMOS-based bus switch operating strictly within 4.5V–5.5V, with moderate leakage currents and no support for sub-3.3V operation. In contrast, the SN74CBTLV6845ADW extends compatibility down to 1.4V while maintaining backward compatibility with 5V systems, offering better integration with low-power microcontrollers. The LV version consumes significantly less static power—often under 1µA compared to several µA for the CBT—and includes enhanced ESD protection up to ±8kV HBM. For mixed-voltage bridging between 3.3V and 5V domains, the CBTLV6845ADW provides automatic level translation without external components, whereas the CBT6845CDW requires careful voltage matching on both sides. However, the original CBT6845 remains suitable for legacy 5V designs where cost and footprint are prioritized over efficiency or future-proofing.
Is it acceptable to leave unused input/output pins unconnected on the SN74CBT6845CDW, or do they require specific termination to ensure reliable operation?
Unused input pins on the SN74CBT6845CDW should not be left floating. Since these devices operate on CMOS technology, floating inputs can settle unpredictably due to substrate leakage, leading to increased power consumption or unintended switching behavior. Each unused input should be tied either to VCC or GND through a pull-up or pull-down resistor (typically 10kΩ) to establish a defined logic state. Output pins, however, can remain unconnected without issue since they are inherently high-impedance when disabled (OE = high). However, connecting them to a known load or terminating them properly prevents floating voltages that might interfere with neighboring circuits. Following this guidance ensures consistent noise margins and avoids marginal operation in noisy environments.
What precautions should be taken when hot-plugging boards containing the SN74CBT6845CDW to prevent damage from electrostatic discharge or transient voltage spikes?
Hot-plugging poses risks to the SN74CBT6845CDW due to its relatively modest ESD protection (±2kV HBM per datasheet). Without additional safeguards, insertion into powered or live backplanes can induce latch-up or dielectric breakdown. Implement TVS diodes on signal lines rated for 5V operation and clamp transients below the absolute maximum ratings (VCC ≤ 6V). Series resistors (≥100Ω) on each I/O line limit surge currents during plug/unplug events. If possible, disable the OE pin before insertion using a mechanical interlock or software-controlled reset sequence. Also ensure that all supplies stabilize before enabling the switch. Although the device has built-in ESD diodes, they are intended only for normal handling per JEDEC standards—not for repeated field exposure. Therefore, robust board-level protection is strongly advised in end equipment subject to frequent connection changes.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments SN74CBT6845CDW

Product Attribute SN74CBT6845CDWR SN74CBT6845CDWRG4 SN74CBT6845CDWRE4 SN74CBT6845CDGVR
Part Number SN74CBT6845CDWR SN74CBT6845CDWRG4 SN74CBT6845CDWRE4 SN74CBT6845CDGVR
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Voltage Supply Source - - - -
Independent Circuits - - - -
Series - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Base Product Number - DAC34H84 MAX500 ADS62P42
Current - Output High, Low - - - -
Voltage - Supply - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Type - - - -
Circuit - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Mounting Type - Surface Mount Through Hole Surface Mount

SN74CBT6845CDW Datasheet PDF

Download SN74CBT6845CDW pdf datasheets and Texas Instruments documentation for SN74CBT6845CDW - Texas Instruments.

Datasheets
SN74CBT6845CDW.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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SN74CBT6845CDW Image

SN74CBT6845CDW

Texas Instruments
98D-SN74CBT6845CDW

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