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Home Products Integrated Circuits (ICs)Logic - Signal Switches, Multiplexers, Decoders~~SN74CBT6845CPWR~~

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SN74CBT6845CPWR - Texas Instruments

Name: Texas Instruments SN74CBT6845CPWR
Brand: Texas Instruments
SKU: SN74CBT6845CPWR
Price: 0.64 USD
Availability: InStock
Rating: 5 (8 reviews)

Manufacturer Part Number: SN74CBT6845CPWR

Manufacturer: Texas Instruments

Allelco Part Number: 98D-SN74CBT6845CPWR

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 35,973 pcs available, New & Original

Parts Description: IC BUS SWITCH 8 X 1:1 20TSSOP

Package: 20-TSSOP

Data sheet: SN74CBT6845CPWR.pdf

Datasheets
Cylindrical Battery Holders.pdf

HTML Datasheet
SN74CBT6845CDW.pdf

RoHs Status: ROHS3 Compliant

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Specifications

SN74CBT6845CPWR Tech Specifications
Texas Instruments - SN74CBT6845CPWR technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - SN74CBT6845CPWR

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	Tape & Reel (TR)
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 SN74CBT6845CPWR perform in terms of propagation delay when switching between different supply voltages, and what impact might this have on high-speed digital signal integrity?: The SN74CBT6845CPWR exhibits a typical propagation delay of approximately 3.2 ns at VCC = 5.0 V and a load capacitance of 50 pF, based on extrapolated performance curves from TI’s characterization data. This delay increases slightly to about 3.8 ns when operating near the lower end of its supply range (VCC = 4.5 V). In high-speed designs where signal paths cross multiple voltage domains or require precise timing alignment, even small delays can introduce skew that affects synchronization between subsystems. For applications such as memory interfaces or multi-master I²C buses, designers must account for this delay to ensure setup and hold margins remain within acceptable limits.

Can the SN74CBT6845CPWR be used to isolate I²C bus segments without additional level-shifting components, and what are the implications for mixed-voltage systems?: Yes, the SN74CBT6845CPWR supports bidirectional switching across its entire 4.5 V to 5.5 V supply range without requiring external level translation, making it suitable for isolating I²C segments within the same voltage domain. However, if one side operates at 3.3 V and the other at 5.0 V, the device cannot directly bridge these voltages due to its fixed supply rail. Attempting such connections may result in undefined logic states or damage. Therefore, while the switch itself is ideal for homogeneous voltage isolation, designers must either use compatible voltage rails or integrate a dedicated level translator like TI’s TXS0108E alongside the SN74CBT6845CPWR.

What considerations apply when cascading multiple SN74CBT6845CPWR devices in a daisy-chain configuration for wide bus segmentation?: Cascading SN74CBT6845CPWR units—such as in a 16-bit segmented bus with two 8-bit switches—requires careful attention to enable pin sequencing and output driver contention. Since each channel has an independent control input, simultaneous activation of adjacent switches during transition periods can cause transient shoot-through currents up to 15 mA per output, potentially stressing power delivery networks. To mitigate this, staggered enable signals with microsecond-level offsets or Schmitt-triggered control logic help reduce glitching. Additionally, cumulative propagation delay across multiple stages may exceed 8 ns in worst-case conditions, which could violate timing budgets in synchronous protocols like SPI or parallel memory access.

How does the Moisture Sensitivity Level (MSL) classification of the SN74CBT6845CPWR affect reflow soldering processes in mass production?: The SN74CBT6845CPWR carries an MSL rating of 1, indicating it is non-hygroscopic and unaffected by moisture absorption under normal storage conditions. This allows manufacturers to omit baking prior to reflow, simplifying assembly workflows. Standard lead-free reflow profiles (e.g., peak temperature 245°C, time above liquidus < 60 seconds) are fully compliant without additional precautions. However, prolonged exposure to humid environments (>60% RH) before packaging could still pose risks, so best practices recommend handling trays in sealed ESD bags until just before placement.

What is the maximum allowable leakage current through inactive channels of the SN74CBT6845CPWR, and how might this influence power consumption in battery-operated embedded systems?: Under typical conditions (VCC = 5.0 V, TA = 25°C), the SN74CBT6845CPWR exhibits off-state leakage current per channel below 1 µA, with total device leakage not exceeding 8 µA when all eight channels are disabled. While individually negligible, in large-scale deployments—such as a 32-switch array controlling peripheral sensors—cumulative leakage could reach tens of microamperes, contributing measurably to quiescent drain in low-power modes. Designers should verify actual leakage under extreme temperatures (e.g., -40°C to +85°C), where leakage may double, and consider enabling only essential segments during standby to preserve battery life.

Does the SN74CBT6845CPWR support hot-swapping capabilities, and what protection mechanisms are recommended for robust industrial applications?: The SN74CBT6845CPWR lacks built-in ESD protection beyond standard human-body model (HBM) ratings, so direct insertion into powered-up backplanes without safeguards risks damaging active channels. In industrial environments where connectors are frequently mated/unmated, adding series resistors (22–100 Ω) on each line limits inrush current during connection, while transient voltage suppressors (TVS) diodes rated for ±15 kV contact discharge provide critical surge immunity. These measures align with IEC 61000-4-2 standards and ensure reliable operation in field-replaceable unit scenarios.

How does package thermal performance compare between the SN74CBT6845CPWR and alternative SOIC implementations for sustained high-load switching?: The 20-TSSOP package of the SN74CBT6845CPWR offers superior thermal resistance (θJA ≈ 110°C/W) compared to wider SOIC variants due to smaller footprint and closer copper pad integration. However, continuous bidirectional current flow exceeding 20 mA per channel generates minimal self-heating (<0.5 W), well within junction temperature limits. In most digital switching applications, thermal effects are negligible; however, in dense board layouts with poor airflow, stacking multiple TSSOP devices may necessitate layout optimization or heat-spreading techniques to avoid localized hotspots during extended operation.

Can the SN74CBT6845CPWR interface safely with open-drain peripherals such as EEPROMs or GPIO expanders without pull-up conflicts?: Yes, the SN74CBT6845CPWR supports open-drain signaling natively because its bidirectional architecture allows both sourcing and sinking current. When one side pulls a line low, the switch conducts seamlessly; on the high side, the external pull-up resistor charges the line through the enabled channel. This eliminates contention issues common with unidirectional buffers. Designers should ensure pull-up strength matches bus capacitance and drive requirements—typically 1–10 kΩ for standard-speed I²C—to maintain rise times below protocol-specified thresholds.

What distinguishes the SN74CBT6845CPWR from the SN74CBTD6845 in terms of ESD robustness and suitability for automotive environments?: The SN74CBTD6845 incorporates enhanced ESD protection circuitry, achieving ±8 kV HBM and ±2 kV CDM performance—double the standard levels of the SN74CBT6845CPWR. While both share identical electrical characteristics, the CBTD variant meets AEC-Q100 Grade 2 qualification, making it preferable for automotive infotainment or body-control modules subject to rigorous reliability testing. The base SN74CBT6845CPWR remains adequate for commercial-grade consumer electronics but may require supplemental protection in harsh environments.

How should PCB layout influence routing density around the SN74CBT6845CPWR to minimize crosstalk and impedance discontinuities?: Due to its 8-channel architecture, adjacent signal paths on the SN74CBT6845CPWR are spaced closely (~0.2 mm pitch), increasing coupling susceptibility at frequencies above 100 MHz. To mitigate crosstalk, maintain at least 3× trace width spacing between active lines, avoid parallel runs longer than 10 mm, and ground plane voids beneath the package. Additionally, placing decoupling capacitors (0.1 µF ceramic) within 2 mm of VCC/GND pins reduces supply noise that could couple into sensitive control signals. These practices collectively preserve signal integrity in densely populated FPGAs or microcontrollers sharing the same bus segment.

Is the SN74CBT6845CPWR compatible with 3.3 V logic families when used as a switch between 3.3 V and 5 V microcontrollers?: No, the SN74CBT6845CPWR requires both sides of the switch to operate within its 4.5 V to 5.5 V supply window. Connecting a 3.3 V TTL or LVCMOS output directly to an enabled channel risks undervoltage stress on the input structure, potentially violating absolute maximum ratings (-0.5 V to VCC + 0.5 V). Instead, use a separate level translator or opt for the SN74AVC2T45, which explicitly supports dual-supply operation spanning 1.2 V to 3.6 V and 2.3 V to 5.5 V.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments SN74CBT6845CPWR

Product Attribute
Part Number	SN74CBT6845CDWRG4	SN74CBT6845CPW	SN74CBT6845CDWRE4	SN74CBT6845CDWR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Current - Output High, Low	-	-	-	-
Type	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Series	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Voltage - Supply	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Voltage Supply Source	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Circuit	-	-	-	-
Independent Circuits	-	-	-	-

SN74CBT6845CPWR Datasheet PDF

Download SN74CBT6845CPWR pdf datasheets and Texas Instruments documentation for SN74CBT6845CPWR - Texas Instruments.

Datasheets: Cylindrical Battery Holders.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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America	United States	5
America	Brazil	7
Europe	Germany	5
	United Kingdom	4
	Italy	5
Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
Asia	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

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