SN74BCT29843DWG4

Overview

The SN74BCT29843DWG4 is a nine-bit latch with three-state outputs manufactured by Texas Instruments. It utilizes a BiCMOS process featuring CMOS inputs and TTL outputs to reduce standby current. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature from 0°C to 70°C. Key electrical characteristics include a high-level output current of -24 mA and a low-level output current of 48 mA at 5 V. Propagation delays from D to Q range from 1.5 ns to 9 ns, while OE control delays vary between 2 ns and 15 ns depending on the transition direction.

Feature Summary

• Features transparent D-type latches where outputs are complementary to data inputs when latch-enable is high
• Provides buffered output-enable capability to place outputs in normal logic states or high-impedance states without loading bus lines
• Utilizes BiCMOS technology to substantially reduce standby current compared to standard bipolar processes

Applications

• Implementing wider buffer registers
• Designing I/O ports
• Creating bidirectional bus drivers with parity
• Constructing working registers

Procurement Notes

Verify the specific ordering suffix G4 indicates lead-free and RoHS compliance status as defined in the manufacturer's packaging addendum. Confirm the SOIC DW package drawing matches the required footprint for PCB layout. Ensure the active status aligns with long-term availability requirements for new designs.

Selection Notes

Select this component when nine-bit storage with high-drive three-state outputs is required. The BiCMOS architecture offers lower power consumption than equivalent TTL devices. Verify that the 5V supply voltage and industrial temperature range meet system constraints. Consider the propagation delay specifications for timing closure in synchronous designs.

Part Context

This part belongs to the SN74BCT series, which bridges CMOS input compatibility with TTL output drive capabilities. The SN74BCT29843 specifically provides nine bits of latching functionality. It is distinct from non-latched buffers like the SN74BCT240. The device is designed for general-purpose digital logic applications requiring bus isolation and data retention.

Replacement Considerations

The SN74BCT29843DWE4 is a verified alternative offering identical electrical and functional specifications with different manufacturing lot coding. Both parts share the same SOIC-24 package and pinout configuration.