SN74CBT3126D

Overview

The SN74CBT3126D is a low-voltage quadruple FET bus switch manufactured by Texas Instruments. It operates within a supply voltage range of 2.3 V to 3.6 V and supports bidirectional data transmission across four independent channels. The device features powered-off protection, ensuring that high-impedance states are maintained when the power supply is off. It is housed in an 8-pin SOIC package with a maximum on-resistance of 40 ohms and a typical on-resistance of 5 ohms. The component supports standard SPI and JTAG signals and maintains an operating temperature range from -40 °C to +85 °C.

Feature Summary

• Provides powered-off protection to prevent current leakage when the device is unpowered
• Supports standard SPI and JTAG signal protocols for reliable communication
• Features low on-resistance for efficient signal transmission

Applications

• SPI interface circuits
• JTAG boundary scan applications
• Low-voltage bus switching systems

Procurement Notes

Verify the specific package suffix 'D' corresponds to the SOIC-8 configuration required for your PCB layout. Confirm that the 2.3 V to 3.6 V supply voltage range aligns with your system's power rails. Ensure the 40 ohm maximum on-resistance meets your signal integrity requirements. Check for RoHS compliance status if environmental regulations apply to your manufacturing process.

Selection Notes

Select this component when designing low-voltage digital interfaces requiring isolated bus segments. It is suitable for applications needing bidirectional data flow control without level shifting. Consider the 8-pin SOIC footprint during schematic capture. Evaluate the 4-channel capacity against your total I/O requirements to optimize board space usage.

Part Context

This part belongs to the SN74CBTLV series of low-voltage bus switches. It shares functional similarities with other members like the SN74CBTLV3126PWR but differs in packaging. The D suffix indicates a specific surface-mount package variant. It is designed for general-purpose digital logic applications requiring robust signal switching capabilities.

Replacement Considerations

The SN74CBTLV3126PWR is a documented substitute offering identical electrical characteristics in a TSSOP-14 package. Verify pin compatibility and physical dimensions before substitution. Other family members may require level-shifting or have different channel counts.