TC7MB3257CFT-EL(M)

Overview

The TC7MB3257CFT-EL(M) is a low capacitance CMOS quad 1-of-2 multiplexer/demultiplexer manufactured by Toshiba Semiconductor and Storage. It operates within a supply voltage range of 4.0 to 5.5 V and supports an operating temperature from -40 to 85 °C. The device features four independent channels with common select (S) and output enable (OE) inputs. Key electrical parameters include a typical on-resistance (RON) of 3 Ω at VCC=4.5V and a switch-on capacitance (CI/O) of 8.5 pF at VCC=5V. ESD protection ratings are ±200 V for the machine model and ±2000 V for the human body model.

Feature Summary

• Provides four individual two-input multiplexer/demultiplexer circuits with common control inputs.
• Features low on-resistance and low capacitance for minimal propagation delay.
• Includes power-down protection for all input pins to prevent leakage during power-off states.
• Compatible with TTL outputs for control inputs.

Applications

• Low capacitance signal routing in high-speed digital systems
• Multiplexing data lines in portable electronic devices
• Demultiplexing signals in communication interfaces

Procurement Notes

Verify the specific package variant required, as the base part number covers TSSOP16, VSSOP16, and VQON16 options. Confirm RoHS compliance status directly with the manufacturer or authorized distributors, as environmental declarations may vary by production batch. Ensure that the ordering suffix matches the desired physical footprint and tape-and-reel specifications for automated assembly processes.

Selection Notes

Select this component when low signal distortion and fast switching speeds are critical due to its low capacitance profile. Ensure the system supply voltage remains within the 4.0 V to 5.5 V operating range to maintain specified on-resistance values. Consider the ESD protection levels if the application involves frequent handling or exposure to electrostatic discharge risks without additional circuit safeguards.

Part Context

This device belongs to the TC7MBL series of low capacitance bus switches and multiplexers designed for space-constrained applications. It serves as a functional alternative to standard logic switches where signal integrity is paramount. The quad configuration allows for efficient management of multiple data paths using a minimal number of control pins, optimizing board layout complexity.

Replacement Considerations

The datasheet notes pin compatibility with the TC7MB3257FT and TC7MB3257FK variants. Verify package dimensions and weight differences if substituting between TSSOP, VSSOP, or VQON footprints to ensure mechanical fit.

FAQ

How does the output enable (OE) input affect the switch state?

When the OE input is held at a high level, the switches remain open regardless of the select input state, creating a high-impedance state between the terminals.

What is the maximum power dissipation rating for this IC?

The absolute maximum power dissipation rating is 180 mW.