74HCT534D,652 Equivalent & Substitute Parts

Part Overview

The 74HCT534D,652 is a D-Type flip-flop logic integrated circuit manufactured by NXP USA Inc., configured as a single 8-bit element with tri-state inverted outputs. This component operates at a clock frequency of 40 MHz with a maximum propagation delay of 30ns at 4.5V with 50pF load. The device is packaged in a 20-SOIC surface mount configuration and is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

74HCT534D,652

NXP USA Inc.In Stock: 81774HCT534D,652 Datasheet

Current PartRFQ

CD74HCT564M

Texas InstrumentsIn Stock: 741CD74HCT564M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HCT534D,652 is determined by strict equivalence in the following critical parameters:

• Logic Function: D-Type flip-flop, single 8-bit element configuration
• Output Configuration: Tri-state, inverted outputs
• Trigger Type: Positive edge triggered
• Package Type: 20-SOIC surface mount with identical physical dimensions (0.295", 7.50mm width)
• Voltage Supply Range: 4.5V ~ 5.5V compatibility
• Output Drive Capability: 6mA high and low current matching
• Compliance Standards: ROHS3 compliance and REACH unaffected status

The CD74HCT564M from Texas Instruments meets all substitution criteria. While this substitute demonstrates improved electrical performance characteristics (50 MHz clock frequency, 14ns propagation delay, extended temperature range to -55°C), it maintains full functional and physical compatibility with the original 74HCT534D,652 within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT564M from Texas Instruments is the direct functional equivalent for the obsolete 74HCT534D,652. Selection of this substitute is supported by:

• Product Status Alignment: The substitute maintains active product status, ensuring long-term availability and manufacturing continuity compared to the obsolete original part.
• Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements without modification to existing designs.
• Functional Compatibility: Identical logic function, output configuration, trigger type, and package footprint enable direct substitution without circuit redesign.
• Performance Enhancement: The substitute provides improved electrical performance within the same supply voltage and output current specifications, offering superior propagation delay characteristics and extended operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT564M be used as a direct replacement for the 74HCT534D,652 in existing designs?

A: Yes. Both components share identical logic function, output configuration, supply voltage range, output drive capability, and 20-SOIC package dimensions. Direct substitution is possible without circuit modification.

Q: What are the key differences between these two parts?

A: The CD74HCT564M offers improved performance specifications: 50 MHz clock frequency versus 40 MHz, 14ns maximum propagation delay versus 30ns, and extended operating temperature range to -55°C versus -40°C. The original 74HCT534D,652 is obsolete while the substitute maintains active product status.

Q: Are there any compatibility concerns with the 20-SOIC package?

A: No. Both components use identical 20-SOIC packaging with 0.295" (7.50mm) width. PCB footprints and assembly processes remain unchanged.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 74HCT534D,652 and CD74HCT564M are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the quiescent current specification for both parts?

A: Both components specify 8 µA quiescent current (Iq), maintaining identical power consumption characteristics in standby operation.