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SN74CBTD3306CPWR

Dual 5-bit FET bus switch, 5V-to-3.3V level shift, 7Ω Ron, TSSOP-14

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Manufacturer Part：

SN74CBTD3306CPWR

Package：

TSSOP-14 (5.0 × 4.4 × 1.0 mm)

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Description

Product Overview

The SN74CBTD3306CPWR is a 1-bit FET bus switch with level-shifting capability from Texas Instruments, packaged in a 14-pin TSSOP (PW) package. It features two independently controlled 5-bit bus switches with 5V-tolerant inputs and built-in level translation from 5V to 3.3V. The device is optimized for hot-insertion and live-insertion applications with low on-state resistance.

Key Specifications

Function Dual 5-Bit FET Bus Switch
Bus Width 5 bits × 2 buses
Supply Voltage 3.3V (VCC)
Input Voltage Tolerance Up to 5.5V
Ron (typical) 7Ω at 3.3V
Level Translation 5V to 3.3V (built-in diode)
Package 14-pin TSSOP (5.0 × 4.4 mm)
Operating Temperature -40°C to +85°C

Features

  • Dual 5-bit bus switch with independent enable control
  • Built-in level shifting from 5V to 3.3V via internal diode
  • 5V-tolerant input/output pins
  • Low on-state resistance (7Ω typical)
  • Near-zero propagation delay through the switch
  • Supports hot-insertion and live-insertion applications

    • Applications

    • PCI/PCI-X bus isolation and level translation
    • Hot-plug and live-insertion card slots
    • 5V to 3.3V bus interface bridging
    • Server and workstation backplane switching
    • Computer peripheral interface switching

    The SN74CBTD3306C is a dual 5-bit FET bus switch with integrated level-shifting capability from Texas Instruments. It contains two independently controlled 5-bit bus switches that can isolate or connect two 5-bit buses. The internal diode clamp provides automatic 5V-to-3.3V level translation, making it ideal for mixed-voltage system designs. The FET switch architecture provides near-zero propagation delay, enabling high-speed bus switching without adding latency. The device is particularly suited for hot-insertion applications where boards are inserted into live systems.

    The SN74CBTD3306C uses N-channel MOSFET pass transistors as analog switches. When the enable (OE) pin is low, the MOSFET gate is driven to VCC, turning on the switch and creating a low-resistance path (7Ω typical) between the A and B ports. When OE is high, the MOSFET is off, creating a high-impedance state that isolates the buses. The internal diode connected between VCC and the MOSFET gate limits the gate voltage, which in turn clamps the maximum voltage that can pass through the switch to VCC + Vdiode. This effectively provides 5V-to-3.3V level translation: a 5V signal on the A port is clamped to approximately 3.3V + 0.7V on the B port, protecting 3.3V logic from overvoltage while preserving signal integrity.

    Pin Name Type Function
    1 1OE Input Switch 1 output enable — active low
    2-6 1A1-1A5 I/O Switch 1 port A — 5-bit bus
    7 GND Power Ground
    8-12 2B1-2B5 I/O Switch 2 port B — 5-bit bus
    13 2OE Input Switch 2 output enable — active low
    14 VCC Power Supply voltage (3.3V)
    • PCI/PCI-X bus isolation between 5V and 3.3V subsystems
    • Hot-plug card slot bus switching in servers
    • 5V-to-3.3V bus bridging in mixed-voltage systems
    • Computer peripheral interface signal routing
    • Bus isolation for firmware upgrade paths
    Manufacturer Part Number Package Notes
    TI SN74CBTD3384CPWR TSSOP-24 10-bit version of same family
    TI SN74CBT3257CPWR TSSOP-16 Quad 2:1 mux bus switch
    NXP 74CBTLV3257 TSSOP-16 Low-voltage bus switch
    onsemi NB7V74M QFN-24 10-bit bus switch with level shift
    Renesas 74CBTLV3257 TSSOP-16 Quad bus switch, similar function
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    Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

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    Service & Packaging

    Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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    Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
     

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