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

Texas Instruments SN74CBT1G384DCKR

Name: SN74CBT1G384DCKR
Brand: Texas Instruments
SKU: SN74CBT1G384DCKR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CBT1G384DCKR

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 5-TSSOP, SC-70-5, SOT-353

Datasheet:: SN74CBT1G384DCKR.pdf

Description:: IC BUS SWITCH 1 X 1:1 SC70-5

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Product details

Overview

SN74CBT1G384DCKR from Texas Instruments is a single-channel FET bus switch in SC-70 (DCK) package with 5-pin configuration, 5 Ω typical on-state resistance at 4.5 V V_CC, TTL-compatible OE control input, and 0.35 ns propagation delay. It enables bidirectional signal routing in low-voltage data paths such as USB 1.1 transceivers and I²C level-shifting interfaces.

For engineers reviewing the SN74CBT1G384DCKR datasheet, SN74CBT1G384DCKR pinout, SN74CBT1G384DCKR application, or SN74CBT1G384DCKR equivalent, key selection criteria include on-resistance matching, enable timing (t_en/t_dis), thermal impedance (252 °C/W), supply voltage range (4–5.5 V), and SC-70 footprint compatibility for space-constrained PCB layouts.

Technical Context

The SN74CBT1G384DCKR implements a single N-channel MOSFET switch controlled by an active-low OE signal. When OE is low, the A–B path conducts bidirectionally with minimal distortion; when OE is high, the channel is fully isolated with 4 pF off-capacitance.

It operates within –40°C to +85°C ambient temperature and supports 4–5.5 V V_CC, with input clamp current rated to ±50 mA and continuous channel current up to 128 mA. Its 5-pin SC-70 package delivers compact placement while maintaining thermal performance via 252 °C/W junction-to-ambient thermal resistance.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4 V to 5.5 V - Ensures compatibility with 3.3 V and 5 V logic systems without level translation.
r_on (Typ)	5 Ω at V_CC = 4.5 V, I_I = 30 mA - Enables low insertion loss in high-speed digital signal paths.
t_pd	0.35 ns at V_CC = 5 V, C_L = 50 pF - Supports >1 GHz signal bandwidth with negligible propagation skew.
C_io(OFF)	4 pF - Minimizes capacitive loading on disabled signal lines, preserving signal integrity in multiplexed buses.
θ_JA	252 °C/W - Defines thermal derating limit for sustained 128 mA conduction in SC-70 package under still-air conditions.
OE Logic	Active-low TTL-compatible - Directly interfaces with standard logic outputs without pull-up resistors or voltage translation.
I_CC	1 µA max at V_CC = 5.5 V - Enables ultra-low static power in always-on system management functions.

Pinout & Package

SN74CBT1G384DCKR uses the SC-70 (DCK) 5-pin surface-mount package (1.85 mm × 1.35 mm × 1.1 mm height), optimized for high-density PCB layouts and reflow-compatible assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 (A)	Input/Output port A	Bidirectional signal terminal; connects to source-side of bus segment; referenced to same V_CC domain as B.
2 (GND)	Ground reference	Provides return path for switch current and control logic; must be low-impedance for noise immunity.
3 (OE)	Output-enable control	Active-low TTL-compatible input; drives internal gate driver to turn FET on/off; no external pull-up required.
4 (V_CC)	Power supply	Supplies gate drive and internal bias; decoupling capacitor (0.1 µF) required within 3 mm of pin.
5 (B)	Input/Output port B	Bidirectional signal terminal; connects to sink-side of bus segment; electrically identical to A pin.

Key Features

Feature	Design Value
Low on-state resistance	5 Ω typical ensures <0.15 V drop at 30 mA, preserving logic-high margin in 3.3 V systems.
Fast switching speed	0.35 ns t_pd and 1.6 ns t_en support clean edge transmission in 100+ MHz clock domains.
TTL-compatible control	VIH = 2 V / VIL = 0.8 V allows direct connection to legacy 5 V microcontrollers without interface logic.
Low off-capacitance	4 pF C_io(OFF) minimizes crosstalk and signal reflection when multiple switches share a common bus stub.
SC-70 footprint	1.85 mm × 1.35 mm body size enables placement in tight spaces where SOT-23 is too large.

Applications

USB 1.1 Transceiver Isolation	I²C Bus Level Translation
Use Scenario: Isolating D+ and D− lines between host controller and peripheral during suspend/resume transitions to prevent leakage current and bus contention. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling/disabling differential data paths under firmware-controlled OE signal. Use Value: Prevents >100 µA standby current per line while maintaining sub-nanosecond signal fidelity across full USB 1.1 bandwidth.	Use Scenario: Connecting 3.3 V microcontroller I²C pins to 5 V sensor nodes without damaging either side's GPIO. IC Role / Device Role / Timing Role: Passive level translator using intrinsic FET threshold behavior; no external biasing required. Use Value: Eliminates need for dedicated level-shifter ICs or resistor-divider networks, reducing BOM count and layout area.
PCI Express Clock Buffering	Test Access Port (TAP) Multiplexing
Use Scenario: Routing REFCLK+ and REFCLK− between PCIe root complex and multiple endpoint slots with dynamic enable/disable. IC Role / Device Role / Timing Role: Low-capacitance, low-resistance switch inserted in differential clock path to manage fanout and isolation. Use Value: Maintains <1 ps jitter addition and preserves 100 MHz clock integrity across 5 cm trace lengths.	Use Scenario: Sharing JTAG TCK/TMS/TDI/TDO signals among multiple ASICs on a board using software-selectable routing. IC Role / Device Role / Timing Role: Single-pole single-throw (SPST) switch per signal line, controlled by FPGA-configurable OE lines. Use Value: Reduces test connector count by 75% and eliminates mechanical switch wear in production test fixtures.

USB 1.1 Transceiver Isolation

I²C Bus Level Translation

Use Scenario: Isolating D+ and D− lines between host controller and peripheral during suspend/resume transitions to prevent leakage current and bus contention.

IC Role / Device Role / Timing Role: Bidirectional analog switch enabling/disabling differential data paths under firmware-controlled OE signal.

Use Value: Prevents >100 µA standby current per line while maintaining sub-nanosecond signal fidelity across full USB 1.1 bandwidth.

Use Scenario: Connecting 3.3 V microcontroller I²C pins to 5 V sensor nodes without damaging either side's GPIO.

IC Role / Device Role / Timing Role: Passive level translator using intrinsic FET threshold behavior; no external biasing required.

Use Value: Eliminates need for dedicated level-shifter ICs or resistor-divider networks, reducing BOM count and layout area.

PCI Express Clock Buffering

Test Access Port (TAP) Multiplexing

Use Scenario: Routing REFCLK+ and REFCLK− between PCIe root complex and multiple endpoint slots with dynamic enable/disable.

IC Role / Device Role / Timing Role: Low-capacitance, low-resistance switch inserted in differential clock path to manage fanout and isolation.

Use Value: Maintains <1 ps jitter addition and preserves 100 MHz clock integrity across 5 cm trace lengths.

Use Scenario: Sharing JTAG TCK/TMS/TDI/TDO signals among multiple ASICs on a board using software-selectable routing.

IC Role / Device Role / Timing Role: Single-pole single-throw (SPST) switch per signal line, controlled by FPGA-configurable OE lines.

Use Value: Reduces test connector count by 75% and eliminates mechanical switch wear in production test fixtures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT1G384DBVR	SOT-23 (DBV) package; θ_JA = 206 °C/W; same electrical specs and pinout.	Requires larger PCB footprint (2.92 mm × 1.3 mm vs. 1.85 mm × 1.35 mm); better thermal performance in high-current use.	Select DBVR when thermal dissipation >80 mW is expected or existing layout uses SOT-23 land pattern.
NC7SZ384P5X	ON Semiconductor part; 3.3 V only (V_CC = 1.65–3.6 V); r_on = 8 Ω typical; SC-70-5 package.	Not suitable for 5 V systems; higher on-resistance increases voltage drop in 30 mA+ loads.	Select NC7SZ384P5X only for strictly 3.3 V designs where lower V_CC headroom justifies trade-off in conduction loss.

Compared with SN74CBT1G384DBVR, SN74CBT1G384DCKR saves 35% board area but trades 46 °C/W higher thermal resistance; compared with NC7SZ384P5X, it supports dual-voltage operation and delivers 38% lower r_on, making it preferable for mixed-voltage industrial interfaces.

Availability

SN74CBT1G384DCKR is available at Aetrix Electronics and suitable for USB interface isolation, I²C level translation, and PCIe clock routing requiring stable component supply across automotive infotainment, industrial PLC backplanes, and medical diagnostic equipment.

Supply support for SN74CBT1G384DCKR 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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and connectivity solutions since 1930.

The SN74CBT1G384DCKR belongs to TI's CBT (Crossbar Bus Transceiver) family, engineered for high-speed, low-distortion signal routing in mixed-voltage digital systems where minimal propagation delay and precise on-resistance control are critical.

FAQ

What is the maximum continuous current rating for SN74CBT1G384DCKR?

The SN74CBT1G384DCKR supports a continuous channel current of 128 mA, verified per Absolute Maximum Ratings table in the official datasheet. This rating applies under recommended operating conditions (V_CC = 4–5.5 V, T_A = –40°C to +85°C) with adequate PCB copper pour for heat dissipation. Exceeding this current may cause thermal runaway due to the device's 252 °C/W θ_JA.

Does SN74CBT1G384DCKR require external pull-up resistors on the OE pin?

No, SN74CBT1G384DCKR does not require external pull-up resistors on the OE pin. Its control input is TTL-compatible with V_IL = 0.8 V max and V_IH = 2 V min, allowing direct connection to standard logic outputs. The internal input structure draws only ±1 µA, eliminating need for biasing components in most digital control configurations.

Can SN74CBT1G384DCKR operate at 3.3 V V_CC?

No, SN74CBT1G384DCKR is not specified for 3.3 V operation. Its Recommended Operating Conditions require V_CC ≥ 4 V, and Absolute Maximum Ratings define minimum V_CC as –0.5 V but functional operation below 4 V is not guaranteed. At 3.3 V, r_on increases significantly and timing parameters degrade beyond datasheet limits.

What is the off-isolation performance of SN74CBT1G384DCKR?

SN74CBT1G384DCKR achieves 4 pF off-capacitance (C_io(OFF)) when OE = V_CC, measured at 3 V or 0 V on A/B terminals. This low capacitance ensures minimal signal coupling between enabled and disabled channels, supporting >100 MHz isolation in high-frequency bus architectures without added shielding or guard traces.

Is SN74CBT1G384DCKR RoHS compliant and lead-free?

Yes, SN74CBT1G384DCKR is RoHS compliant and features lead-free NIPDAU (nickel/palladium/gold) or pure tin (SN) lead finish, as confirmed in TI's Packaging Information document. It meets JEDEC MSL Level-1 rating with peak reflow temperature of 260°C, and all variants carry "Yes" in the RoHS column of TI's official packaging addendum.

SN74CBT1G384DCKR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBT

Package/Case:: 5-TSSOP, SC-70-5, SOT-353

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Bus Switch

Circuit:: 1 x 1:1

Independent Circuits:: 1

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:: SC-70-5

SN74CBT1G384DCKR FAQ

1.How can I place an order for SN74CBT1G384DCKR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CBT1G384DCKR 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 SN74CBT1G384DCKR reliable?

The price and inventory of SN74CBT1G384DCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT1G384DCKR is usually 5 days.

3.What payment methods are accepted for SN74CBT1G384DCKR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT1G384DCKR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74CBT1G384DCKR?

SN74CBT1G384DCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CBT1G384DCKR 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 SN74CBT1G384DCKR?

For technical support, including SN74CBT1G384DCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT1G384DCKR requirements.

6.How does Aetrix verify that SN74CBT1G384DCKR is sourced from the original manufacturer or authorized distributors?

All SN74CBT1G384DCKR 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 SN74CBT1G384DCKR meets industry standards.

7.What is the process for return or replacement of SN74CBT1G384DCKR?

All SN74CBT1G384DCKR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT1G384DCKR, 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 SN74CBT1G384DCKR part is unused and in its original packaging.

Return procedure for SN74CBT1G384DCKR:

1.Submit a request within 90 days.

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

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