CD74HCT173M Equivalent & Substitute Parts

Part Overview

The CD74HCT173M is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, designed for 4-bit parallel data storage and transfer applications. This component features tri-state, non-inverted outputs with positive edge triggering and operates across a supply voltage range of 4.5V to 5.5V. The part is currently in Last Time Buy status, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this functional specification.

Substiute Parts

CD74HCT173M

Texas InstrumentsIn Stock: 1809CD74HCT173M Datasheet

Current PartRFQ

CD74HCT173M96

Harris CorporationIn Stock: 61111CD74HCT173M96 Datasheet

MFR RecommendedRFQ

74HCT173D,653

Nexperia USA Inc.In Stock: 412574HCT173D,653 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HCT173M is determined by strict equivalence across the following critical parameters:

• Functional Type: D-Type flip-flop with 4-bit storage capacity and master reset capability
• Output Configuration: Tri-state, non-inverted outputs
• Trigger Mechanism: Positive edge triggering
• Package Format: 16-SOIC surface mount package (0.154", 3.90mm width)
• Electrical Specifications: Supply voltage 4.5V ~ 5.5V, output current capability 6 mA per line, propagation delay 40 ns maximum at specified conditions
• Base Product Number: 74HCT173 series designation

The identified substitute parts maintain functional and electrical equivalence within the 74HCT173 logic family while differing in manufacturer, packaging format, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

74HCT173D,653 (Nexperia USA Inc.) is the primary substitute for the CD74HCT173M. This part maintains full functional and electrical equivalence while offering the following advantages: Active product status ensures ongoing availability and manufacturer support, ROHS3 compliance aligns with current environmental regulations, and Tape & Reel packaging supports automated assembly processes. The operating temperature range of -40°C ~ 125°C covers standard industrial applications, with the lower quiescent current (4 µA) and reduced input capacitance (4.6 pF) providing marginal improvements in power efficiency.

CD74HCT173M96 (Harris Corporation) is functionally equivalent but presents compliance limitations. The RoHS non-compliant status restricts use in applications subject to environmental regulations. The Obsolete product status indicates no ongoing manufacturer support or guaranteed future availability. This part should be considered only when legacy system compatibility or specific procurement constraints require Harris Corporation sourcing.

Selection between substitute parts should prioritize product status, regulatory compliance requirements, and packaging format compatibility with assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 74HCT173D,653 directly replace the CD74HCT173M in existing designs?

A: Yes. Both parts share identical functional specifications, electrical characteristics, and 16-SOIC package format. The 74HCT173D,653 operates within the same supply voltage range (4.5V ~ 5.5V), maintains equivalent output current capability (6 mA), and delivers identical propagation delay (40 ns). Pin-to-pin compatibility is maintained across all signal and power connections.

Q: What are the differences in operating temperature ranges?

A: The CD74HCT173M operates from -55°C ~ 125°C, while the 74HCT173D,653 operates from -40°C ~ 125°C. The CD74HCT173M provides extended low-temperature operation suitable for military and aerospace applications. For standard industrial and commercial temperature ranges, the 74HCT173D,653 is sufficient.

Q: Why is the CD74HCT173M96 listed as a substitute if it is obsolete?

A: The CD74HCT173M96 maintains functional and electrical equivalence to the CD74HCT173M and is listed based on the provided substitute relationship data. However, its Obsolete status and RoHS non-compliance make it unsuitable for new designs or applications requiring current environmental certifications. Existing inventory may be available through legacy component suppliers.

Q: How do packaging formats affect component selection?

A: The CD74HCT173M is supplied in Tube packaging, the CD74HCT173M96 in Bulk, and the 74HCT173D,653 in Tape & Reel format. Tube and Bulk packaging are suitable for manual assembly or small-volume production. Tape & Reel format is optimized for automated pick-and-place assembly in high-volume manufacturing. Selection should align with production assembly capabilities and volume requirements.

Q: Are there differences in quiescent current consumption?

A: The CD74HCT173M and CD74HCT173M96 both specify 8 µA quiescent current, while the 74HCT173D,653 specifies 4 µA. For battery-powered or low-power applications requiring extended operational life, the 74HCT173D,653 offers a 50% reduction in standby power consumption.

Q: What compliance certifications should be verified for new designs?

A: The CD74HCT173M and 74HCT173D,653 are both ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations. The CD74HCT173M96 is RoHS non-compliant and should not be used in applications subject to environmental regulations or customer compliance requirements.