74HCT245D,652

Overview

The Nexperia 74HCT245D,652 is an octal bus transceiver with 3-state outputs designed for bidirectional data transfer. It operates within a supply voltage range of 4.5 V to 5.5 V and accepts TTL-level inputs. The device features non-inverting outputs controlled by an output enable (OE) pin and a direction control (DIR) pin. It is housed in a 20-lead SO plastic small outline package (SOT163-1). Propagation delay is specified at a maximum of 28 ns under standard test conditions.

Feature Summary

• Octal bidirectional bus interface with non-inverting 3-state outputs
• TTL input levels compatible with HCT logic family standards
• Direction control via DIR pin and high-impedance OFF-state via OE pin

Applications

• Bidirectional data bus transmission between microprocessors and memory
• Interface bridging between different logic families requiring level translation
• General-purpose digital signal routing in industrial control systems

Procurement Notes

Verify the specific ordering suffix 652 against current Nexperia documentation to confirm package type and compliance status. Confirm that the SO20 package variant matches the required PCB footprint. Check for any recent product change notices or end-of-life announcements affecting this specific part number before finalizing procurement plans.

Selection Notes

Select this component when an 8-bit bidirectional transceiver with TTL-compatible inputs is required. Ensure the application voltage remains within the 4.5 V to 5.5 V range. Consider the propagation delay specifications if timing constraints are critical. Verify that the 20-lead SOIC package dimensions fit the available board space.

Part Context

This device belongs to the 74HCT series of CMOS logic components manufactured by Nexperia. It shares functional similarities with the 74HC245 but utilizes TTL input thresholds for improved noise immunity in 5 V systems. The D,652 designation specifically identifies the SO20 plastic small outline package version within the broader 74HCT245 product line.

Replacement Considerations

The 74HCT245PW serves as a package alternative in the TSSOP20 format. Other variants such as 74HCT245BQ and 74HCT245BZ offer leadless package options. Direct electrical substitution requires verifying pin compatibility and ensuring the replacement package meets thermal and mechanical requirements.