8-pin (DCU) package image

74CB3Q3305DCURG4 ACTIVE

3.3-V, 1:1 (SPST), 2-channel FET bus switch (active high)

ACTIVE custom-reels CUSTOM Custom reel may be available

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Quality information

Rating Catalog
RoHS Yes
REACH Yes
Lead finish / Ball material NIPDAU
MSL rating / Peak reflow Level-1-260C-UNLIM
Quality, reliability
& packaging information

Information included:

  • RoHS
  • REACH
  • Device marking
  • Lead finish / Ball material
  • MSL rating / Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
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Additional manufacturing information

Information included:

  • Fab location
  • Assembly location
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Export classification

*For reference only

  • US ECCN: EAR99

Packaging information

Package | Pins VSSOP (DCU) | 8
Operating temperature range (°C) -40 to 85
Package qty | Carrier 3,000 | LARGE T&R

Features for the SN74CB3Q3305

  • High-bandwidth data path (up to 500 MHz)(1)
  • 5-V tolerant I/Os with device powered up or powered down
  • Low and flat ON-state resistance (ron) characteristics over operating range (ron = 3 Ω typical)
  • Supports input voltage beyond supply on data I/O ports
    • 0 to 5 V switching with 3.3 V VCC
    • 0 to 3.3 V switching with 2.5 V VCC
  • Bidirectional data flow with near-zero propagation delay
  • Low input or output capacitance minimizes loading and signal distortion (Cio(OFF) = 3.5 pF typical)
  • Fast switching frequency (fOE = 20 MHz maximum)
  • Data and control inputs provide undershoot clamp diodes
  • Low power consumption (ICC = 0.25 mA typical)
  • VCC operating range from 2.3 V to 3.6 V
  • Data I/Os support 0 to 5 V signaling levels (0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V)
  • Control inputs can be driven by TTL or 5 V/3.3 V CMOS outputs
  • Ioff supports partial-power-down mode operation
  • Latch-up performance exceeds 100 mA per JESD 78, Class II

(1)For additional information regarding the performance characteristics of the CB3Q family, refer to the TI application report, CBT-C, CB3T, and CB3Q Signal-Switch Families, SCDA008.

Description for the SN74CB3Q3305

The SN74CB3Q3305 device is a high-bandwidth FET bus switch using a charge pump to elevate the gate voltage of the pass transistor, providing a low and flat ON-state resistance (ron). The low and flat ON-state resistance allows for minimal propagation delay and supports switching input voltage beyond the supply on the data input/output (I/O) ports. The device also features low data I/O capacitance to minimize capacitive loading and signal distortion on the data bus. Specifically designed to support high-bandwidth applications, the SN74CB3Q3305 device provides an optimized interface solution ideally suited for broadband communications, networking, and data-intensive computing systems.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry prevents damaging current backflow through the device when it is powered down. The device has isolation during power off.

To ensure the high-impedance state during power up or power down, OE should be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by the current-sourcing capability of the driver.

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Carrier options

You can choose different carrier options based on the quantity of parts, including full reel, custom reel, cut tape, tube or tray.

A custom reel is a continuous length of cut tape from one reel to maintain lot- and date-code traceability, built to the exact quantity requested. Following industry standards, a brass shim connects an 18-inch leader and trailer on both sides of the cut tape for direct feeding into automated assembly machines. TI includes a reeling fee for custom reel orders.

Cut tape is a length of tape cut from a reel. TI may fulfill orders using multiple strips of cut tapes or boxes to satisfy the quantity requested.

TI often ships tube or tray devices inside a box or in the tube or tray, depending on inventory availability. We pack all tapes, tubes or sample boxes according to internal electrostatic discharge and moisture-sensitivity-level protection requirements.

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Lot and date code selection may be available

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