MC74ACT245DT

Overview

The MC74ACT245DT is an octal bidirectional transceiver with three-state outputs in a TSSOP-20 package. It features non-inverting buffers and TTL-compatible inputs, supporting a supply voltage range of 4.5 V to 5.5 V. The device provides 24 mA current sinking capability at both A and B ports. Direction is controlled by the Transmit/Receive input, while the Output Enable input manages high-impedance states. Propagation delays are typically 4.0 ns at 5.0 V with 50 pF load.

Feature Summary

• Bidirectional data path with non-inverting buffer functionality
• TTL-compatible inputs for direct interface with TTL logic systems
• Three-state outputs allowing bus-oriented applications
• High current drive capability of 24 mA at both ports

Applications

• Bus-oriented memory and instrument control systems
• Driving capacitive or low-power CMOS loads
• Data acquisition systems requiring bidirectional signal transfer

Procurement Notes

Verify the specific ordering suffix DT corresponds to the TSSOP-20 package (Case 948E) as listed in the official documentation. Confirm Pb-free status via the G suffix or microdot marking. Ensure the procurement channel sources directly from authorized distributors to guarantee component authenticity and traceability according to onsemi standards.

Selection Notes

Select this component when TTL-compatible input thresholds are required within a 5 V system. The ACT series offers faster propagation speeds compared to standard AC devices. Verify that the application environment operates within the specified -40°C to +85°C temperature range and that the 24 mA output current meets the load requirements without exceeding maximum ratings.

Part Context

This part belongs to the MC74AC245/MC74ACT245 family of octal bidirectional transceivers. The ACT variant specifically distinguishes itself through TTL-compatible input levels, making it suitable for interfacing with legacy TTL logic. The DT suffix denotes the Thin Shrink Small Outline Package (TSSOP), providing a compact footprint for space-constrained designs.

Replacement Considerations

MC74ACT245DWG: Same logical function but in SOIC-20 package. MC74AC245DTG: Same package but lacks TTL-compatible inputs. Cross-family replacements require verification of input threshold compatibility and propagation delay specifications against original design constraints.