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

Texas Instruments SN74CBTD3306DRG4

Name: SN74CBTD3306DRG4
Brand: Texas Instruments
SKU: SN74CBTD3306DRG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CBTD3306DRG4

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: SN74CBTD3306DRG4.pdf

Description:: IC BUS SWITCH 1 X 1:1 8SOIC

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Product details

Overview

SN74CBTD3306DRG4 from Texas Instruments is a dual FET bus switch with integrated level-shifting capability, designed for bidirectional signal routing between 5-V and 3.3-V logic domains. It features two independent switches (1A↔1B, 2A↔2B), 5-Ω typical on-state resistance, TTL-compatible control inputs, and an internal V_CC-clamp diode enabling 5-V-to-3.3-V level translation in data paths such as memory address buses or peripheral I/O interfaces.

For engineers reviewing the SN74CBTD3306DRG4 datasheet, SN74CBTD3306DRG4 pinout, SN74CBTD3306DRG4 application, or SN74CBTD3306DRG4 equivalent, key selection criteria include verified 5-Ω r_on, −40°C to 85°C operating range, TSSOP-8 package thermal performance (θ_JA = 149°C/W), and explicit support for level-shifting without external components.

Technical Context

The SN74CBTD3306DRG4 implements two independent transmission-gate-based FET switches controlled by active-low OE signals (1OE, 2OE), each enabling low-impedance bidirectional conduction when asserted. Its internal diode-to-V_CC structure allows input-side 5-V signals to drive output-side 3.3-V loads while maintaining logic-level compatibility.

Switching is characterized by sub-nanosecond propagation delay (t_pd ≤ 0.25 ns), fast enable/disable times (t_en ≤ 5.4 ns, t_dis ≤ 4.7 ns), and low capacitive loading (C_io(OFF) = 4 pF), making it suitable for high-speed digital interconnects where signal integrity and timing margin are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5 V to 5.5 V - ensures stable operation across standard 5-V supply rails with ±10% tolerance.
r_on (Typical)	5 Ω - enables minimal voltage drop (<150 mV at 30 mA) and preserves signal swing in high-current data paths.
t_pd	0.25 ns - supports >1 GHz signal bandwidth with negligible propagation skew between channels.
C_io(OFF)	4 pF - reduces crosstalk and dynamic power consumption during switch disable states.
VIH/VIL	2.0 V / 0.8 V - guarantees reliable TTL-level recognition of OE control signals without level translators.
Operating Temp	−40°C to 85°C - validated for industrial-grade embedded systems and automotive body electronics.
I_CC (Max)	1.5 mA - minimizes quiescent power draw in always-on bus isolation applications.

Pinout & Package

TSSOP-8 package (PW), 3.0 mm × 4.4 mm footprint, 1.2 mm max height, lead pitch 0.65 mm, moisture sensitivity level (MSL) per JEDEC MO-153.

Pin/Terminal	Circuit Role	Design Meaning
1 (1OE)	Channel 1 Output Enable	Active-low control: drives 1A–1B path to high-impedance when high; enables bidirectional conduction when low.
2 (1A)	Channel 1 Input/Output A	Bidirectional terminal connected to 5-V domain; clamped to V_CC for level shifting.
3 (1B)	Channel 1 Input/Output B	Bidirectional terminal connected to 3.3-V domain; referenced to local ground for translated output.
4 (GND)	Ground Reference	Common return path for both channels; must be low-impedance to maintain noise immunity and r_on stability.
5 (2OE)	Channel 2 Output Enable	Independent active-low control for second switch; enables concurrent or staggered channel management.
6 (2A)	Channel 2 Input/Output A	Second 5-V side port; electrically isolated from 1A but shares same V_CC and GND.
7 (2B)	Channel 2 Input/Output B	Second 3.3-V side port; supports independent level-shifted data routing alongside Channel 1.
8 (V_CC)	Positive Supply	5-V rail powering internal FETs and clamp diodes; decoupling capacitor required within 10 mm for EMI suppression.

Key Features

Feature	Design Value
Integrated Level-Shifting Diode	Enables direct 5-V-to-3.3-V signal translation without external components, reducing BOM count and PCB area.
Low On-State Resistance	5 Ω typical r_on maintains signal integrity across wide frequency ranges and prevents excessive IR drop in 30-mA data lines.
TTL-Compatible Control Inputs	VIH = 2.0 V and VIL = 0.8 V allow direct interfacing with legacy 5-V microcontrollers and FPGAs without pull-up/pull-down networks.
Fast Switching Performance	0.25-ns propagation delay and <5.4-ns enable time support high-speed parallel bus applications including address/data multiplexing.
Low Off-State Capacitance	4-pF C_io(OFF) minimizes capacitive loading on inactive buses, preserving timing margins in multi-drop configurations.

Applications

Memory Address Bus Isolation	Peripheral I/O Voltage Translation
Use Scenario: Isolating 5-V microcontroller address lines from 3.3-V SRAM or Flash memory during power sequencing or standby modes. IC Role / Device Role / Timing Role: Bidirectional bus switch providing galvanic separation and level translation between mismatched voltage domains. Use Value: Eliminates need for discrete level shifters or resistive dividers, reducing component count and layout complexity while maintaining nanosecond timing accuracy.	Use Scenario: Connecting 5-V UART or SPI peripherals to 3.3-V SoC GPIO banks in industrial controllers or IoT gateways. IC Role / Device Role / Timing Role: Direction-agnostic signal translator enabling synchronous full-duplex communication across voltage boundaries. Use Value: Preserves signal edge rates and timing margins due to sub-nanosecond t_pd, avoiding setup/hold violations in high-speed serial protocols.
FPGA I/O Expansion Interface	Legacy System Bus Bridging
Use Scenario: Extending 5-V FPGA I/O banks to interface with 3.3-V sensors or ADCs in test equipment or instrumentation platforms. IC Role / Device Role / Timing Role: Low-latency, low-capacitance bridge supporting configurable I/O directionality under FPGA control. Use Value: Enables reuse of existing 5-V FPGA designs with newer 3.3-V analog front-ends without redesigning PCB layer stack or signal routing.	Use Scenario: Interfacing legacy 5-V ISA or PCI bus signals to modern 3.3-V host processors in medical or aerospace avionics upgrades. IC Role / Device Role / Timing Role: Dual-channel isolator managing address/data strobes and control signals across voltage domains with matched propagation delays. Use Value: Maintains deterministic bus timing across both channels (Δt_pd < 0.1 ns), preventing metastability in synchronized multi-signal transfers.

Memory Address Bus Isolation

Peripheral I/O Voltage Translation

Use Scenario: Isolating 5-V microcontroller address lines from 3.3-V SRAM or Flash memory during power sequencing or standby modes.

IC Role / Device Role / Timing Role: Bidirectional bus switch providing galvanic separation and level translation between mismatched voltage domains.

Use Value: Eliminates need for discrete level shifters or resistive dividers, reducing component count and layout complexity while maintaining nanosecond timing accuracy.

Use Scenario: Connecting 5-V UART or SPI peripherals to 3.3-V SoC GPIO banks in industrial controllers or IoT gateways.

IC Role / Device Role / Timing Role: Direction-agnostic signal translator enabling synchronous full-duplex communication across voltage boundaries.

Use Value: Preserves signal edge rates and timing margins due to sub-nanosecond t_pd, avoiding setup/hold violations in high-speed serial protocols.

FPGA I/O Expansion Interface

Legacy System Bus Bridging

Use Scenario: Extending 5-V FPGA I/O banks to interface with 3.3-V sensors or ADCs in test equipment or instrumentation platforms.

IC Role / Device Role / Timing Role: Low-latency, low-capacitance bridge supporting configurable I/O directionality under FPGA control.

Use Value: Enables reuse of existing 5-V FPGA designs with newer 3.3-V analog front-ends without redesigning PCB layer stack or signal routing.

Use Scenario: Interfacing legacy 5-V ISA or PCI bus signals to modern 3.3-V host processors in medical or aerospace avionics upgrades.

IC Role / Device Role / Timing Role: Dual-channel isolator managing address/data strobes and control signals across voltage domains with matched propagation delays.

Use Value: Maintains deterministic bus timing across both channels (Δt_pd < 0.1 ns), preventing metastability in synchronized multi-signal transfers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3306PWR	Same silicon die, identical electrical specs, TSSOP-8 package with different marking (CC306 vs CC306G4); RoHS-compliant finish differs.	No functional difference in level-shifting or switching behavior; compatible in all SN74CBTD3306DRG4 use cases.	Select when RoHS compliance or specific lead-finish requirements (e.g., matte tin) are mandated by procurement policy.
74LVC2T45DCTR	Direction-controlled dual-bit translator (not bidirectional switch); requires DIR pin; higher r_on (12 Ω typical); supports 1.65–5.5-V dual supplies.	Requires external direction control logic; unsuitable for passive bus sharing; better for asymmetric voltage translation with defined data flow direction.	Choose only if system design mandates explicit direction control and wider supply flexibility outweighs need for true bidirectional transparency.

Compared with SN74CBTD3306DRG4, SN74CBT3306PWR offers identical functionality with minor packaging finish differences, while 74LVC2T45DCTR trades bidirectional simplicity for programmable directionality and broader voltage range-making it less suitable for transparent bus isolation but more flexible in mixed-supply systems requiring directional arbitration.

Availability

SN74CBTD3306DRG4 is available at Aetrix Electronics and suitable for industrial control systems, embedded instrumentation, and legacy-to-modern interface bridging requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74CBTD3306DRG4 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 leader specializing in analog, embedded processing, and connectivity technologies, with over 90 years of innovation in high-reliability electronic components.

The SN74CBTD3306DRG4 belongs to TI's 74CBT family of advanced bus-interface devices, engineered specifically for low-latency, low-distortion signal routing in mixed-voltage digital systems.

FAQ

What is the maximum continuous current rating for each switch in the SN74CBTD3306DRG4?

The SN74CBTD3306DRG4 supports a continuous channel current of 128 mA per switch, as specified in its absolute maximum ratings. This rating applies under recommended operating conditions (V_CC = 4.5 V to 5.5 V, T_A = −40°C to 85°C) and ensures safe operation without thermal runaway or parametric shift. Exceeding this current may degrade r_on stability or accelerate wear-out mechanisms in the integrated FETs. The SN74CBTD3306DRG4 datasheet confirms this value in Section 5.1.

Does the SN74CBTD3306DRG4 require external pull-up or pull-down resistors on its OE pins?

No, the SN74CBTD3306DRG4 does not require external pull-up or pull-down resistors on its OE pins. Its control inputs are TTL-compatible with VIH = 2.0 V and VIL = 0.8 V, allowing direct connection to standard 5-V logic outputs. However, TI recommends holding all unused OE inputs at V_CC or GND to prevent floating states that could cause unintended switching or increased ICC. This guidance is explicitly stated in Note 3 of the SN74CBTD3306DRG4 datasheet.

Can the SN74CBTD3306DRG4 translate signals from 3.3 V to 5 V, or is it unidirectional?

The SN74CBTD3306DRG4 supports bidirectional level shifting: it translates 5-V inputs to 3.3-V outputs via its internal V_CC-clamp diode, and also passes 3.3-V signals to the 5-V side with no degradation. The device functions as a passive transmission gate-voltage translation occurs only when the higher-voltage side drives the lower-voltage side. When 3.3-V signals drive the A port, they appear unchanged at the B port; when 5-V signals drive the A port, the clamp diode limits B-port voltage to ~3.3 V. This behavior is confirmed in the SN74CBTD3306DRG4 functional description and Figure 2 VOH curves.

What is the thermal performance of the SN74CBTD3306DRG4 in its TSSOP-8 package?

The SN74CBTD3306DRG4 in TSSOP-8 (PW) package has a junction-to-ambient thermal impedance (θ_JA) of 149°C/W, as measured per JESD 51-7. This value assumes standard JEDEC 2-layer board conditions and defines the temperature rise above ambient per watt of dissipated power. At maximum ICC (1.5 mA) and worst-case r_on (7 Ω), total power dissipation remains below 1 mW-well within safe thermal limits even at 85°C ambient. The SN74CBTD3306DRG4 thermal data is documented in Section 5.2 of its datasheet.

Is the SN74CBTD3306DRG4 pin-compatible with other members of the 74CBT family, such as the SN74CBT3306?

Yes, the SN74CBTD3306DRG4 is pin-compatible with SN74CBT3306 variants (e.g., SN74CBT3306PWR) in the same TSSOP-8 package. Both share identical pinout (1OE, 1A, 1B, GND, 2OE, 2A, 2B, V_CC), mechanical dimensions, and solder pad layout. Electrical specifications-including r_on, t_pd, and VIH/VIL-are identical; the "D" suffix denotes the same die revision. This compatibility is verified in TI's package outline drawings and ordering information tables for both SN74CBTD3306DRG4 and SN74CBT3306PWR.

SN74CBTD3306DRG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBTD

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Bus Switch

Circuit:: 1 x 1:1

Independent Circuits:: 2

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:: 8-SOIC

SN74CBTD3306DRG4 FAQ

1.How can I place an order for SN74CBTD3306DRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CBTD3306DRG4 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 SN74CBTD3306DRG4 reliable?

The price and inventory of SN74CBTD3306DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTD3306DRG4 is usually 5 days.

3.What payment methods are accepted for SN74CBTD3306DRG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTD3306DRG4 transactions.

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4.How is shipping managed for SN74CBTD3306DRG4?

SN74CBTD3306DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CBTD3306DRG4 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 SN74CBTD3306DRG4?

For technical support, including SN74CBTD3306DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTD3306DRG4 requirements.

6.How does Aetrix verify that SN74CBTD3306DRG4 is sourced from the original manufacturer or authorized distributors?

All SN74CBTD3306DRG4 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 SN74CBTD3306DRG4 meets industry standards.

7.What is the process for return or replacement of SN74CBTD3306DRG4?

All SN74CBTD3306DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD3306DRG4, 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 SN74CBTD3306DRG4 part is unused and in its original packaging.

Return procedure for SN74CBTD3306DRG4:

1.Submit a request within 90 days.

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

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