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Product Detailed Parameters
- Description：IC BUS SWITCH 1 X 1:1 14TSSOP
- Series：74CB
- Mfr：Texas Instruments
- Package：Bulk,Tube
- Type：Bus Switch
- Circuit：1 x 1:1
- Independent Circuits：4
- Current - Output High, Low：-
- Voltage Supply Source：Single Supply
- Voltage - Supply：2.3V ~ 3.6V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：14-TSSOP (0.173", 4.40mm Width)
- Supplier Device Package：14-TSSOP
- Grade：-
- Qualification：-
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Overview
The SN74CB3Q3125PW is a quadruple FET bus switch in a 14-pin TSSOP package. It operates on a single supply voltage ranging from 2.3V to 3.6V and supports data I/O voltages up to 5.5V. The device features four independent 1-bit switches with separate active-low output-enable inputs. Key electrical parameters include a typical ON-state resistance of 4Ω, a maximum propagation delay of 0.2ns at 3.3V, and a maximum control input switching frequency of 20MHz. It provides rail-to-rail switching capabilities and low off-state capacitance.
Feature Summary
- High-bandwidth data path supporting frequencies up to 500MHz
- Rail-to-rail switching capability for analog and digital signals
- 5V tolerant I/Os that function correctly when powered or unpowered
- Low ON-state resistance ensuring minimal signal distortion
Applications
- USB interface connections
- Differential signal interfaces
- Bus isolation circuits
- Optical modules
- Video over fiber systems
Procurement Notes
Verify the obsolete status of the SN74CB3Q3125PW variant before procurement. Confirm that the active replacement SN74CB3Q3125PWR maintains identical pinout and electrical specifications. Ensure the design accommodates the transition from tube packaging to tape-and-reel formats if required by assembly equipment.
Selection Notes
Select this component for applications requiring bidirectional data flow with near-zero propagation delay. It is suitable for broadband communications and networking where low capacitive loading is critical. Verify that the control logic levels match the TTL or CMOS requirements specified in the datasheet.
Part Context
This part belongs to the SN74CB3Q family of high-speed bus switches. It utilizes a charge pump to elevate gate voltage, providing flat ON-state resistance across the operating range. The PW suffix indicates a 14-lead Thin-Shrink Small-Outline Package (TSSOP) with a body size of 5.00mm x 4.40mm.
Replacement Considerations
SN74CB3Q3125PWR
FAQ
How does the device handle partial-power-down scenarios?
The SN74CB3Q3125 includes Ioff circuitry that prevents damaging current backflow through the device when it is powered down, allowing for safe isolation during power-off states.
What is the maximum voltage supported by the data I/O ports?
The data I/O ports support signaling levels up to 5.5V, making them compatible with 5V logic systems even when the VCC supply is lower.
