CD74HCT173MT Equivalent & Substitute Parts

Part Overview

The CD74HCT173MT is a D-Type Flip Flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 4-bit configuration and tri-state, non-inverted output. This component operates as a master reset flip flop in 16-SOIC surface mount packaging. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

CD74HCT173MT

Texas InstrumentsIn Stock: 958CD74HCT173MT Datasheet

Current PartRFQ

CD74HCT173M96

Harris CorporationIn Stock: 61111CD74HCT173M96 Datasheet

Parametric EquivalentRFQ

74HC85PW,118

Nexperia USA Inc.In Stock: 727074HC85PW,118 Datasheet

MFR RecommendedRFQ

74HCT173D,653

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CD74HCT173MT are identified based on strict parametric equivalence across the following critical parameters:

Functional Equivalence Criteria:

• Type: D-Type Flip Flop
• Function: Master Reset
• Number of Elements: 1
• Number of Bits per Element: 4
• Output Type: Tri-State, Non-Inverted
• Trigger Type: Positive Edge

Electrical Equivalence Criteria:

• Voltage - Supply: 4.5V ~ 5.5V
• Clock Frequency: 60 MHz minimum
• Max Propagation Delay @ V, Max CL: 40ns @ 4.5V, 50pF
• Current - Output High, Low: 6mA, 6mA
• Current - Quiescent (Iq): 8 µA
• Input Capacitance: 10 pF

Package Equivalence Criteria:

• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

The substitute parts listed below meet all functional, electrical, and package requirements for direct replacement in applications using the CD74HCT173MT.

Parameter Comparison

Engineering Selection Recommendations

74HCT173D,653 (Nexperia USA Inc.) is the primary recommended substitute for the CD74HCT173MT. This part maintains full functional and electrical equivalence across all critical parameters while offering the advantage of active product status. The 74HCT173D,653 provides improved specifications including higher clock frequency (80 MHz), lower quiescent current (4 µA), and reduced input capacitance (4.6 pF). Compliance with ROHS3 standards and unlimited moisture sensitivity level (MSL 1) align with modern manufacturing requirements. Operating temperature range of -40°C ~ 125°C covers the majority of industrial applications, with the exception of extended low-temperature environments below -40°C.

CD74HCT173M96 (Harris Corporation) provides parametric equivalence to the CD74HCT173MT with identical electrical specifications and package configuration. However, this part carries obsolete product status and RoHS non-compliance, limiting its suitability for new designs or applications requiring regulatory compliance.

For applications requiring the full operating temperature range of -55°C ~ 125°C, the CD74HCT173M96 remains a viable option despite its obsolete status, provided that RoHS compliance is not a design requirement.

Frequently Asked Questions (FAQ)

Q: Can 74HCT173D,653 directly replace CD74HCT173MT in existing designs?

A: Yes. The 74HCT173D,653 maintains functional and electrical equivalence across all critical parameters including type, function, output configuration, voltage supply range, propagation delay, and package configuration. The improved specifications (higher clock frequency, lower quiescent current, reduced input capacitance) provide enhanced performance without compromising compatibility.

Q: What is the significance of the operating temperature range difference between CD74HCT173MT (-55°C ~ 125°C) and 74HCT173D,653 (-40°C ~ 125°C)?

A: The CD74HCT173MT supports extended low-temperature operation down to -55°C, while the 74HCT173D,653 operates from -40°C. For applications requiring operation below -40°C, the CD74HCT173MT or CD74HCT173M96 must be used. For standard industrial applications operating above -40°C, the 74HCT173D,653 is fully compatible.

Q: Why is CD74HCT173M96 listed as a substitute despite RoHS non-compliance?

A: CD74HCT173M96 maintains complete parametric equivalence to the CD74HCT173MT, including identical electrical specifications and package configuration. It serves as a substitute for applications where RoHS compliance is not required or where extended low-temperature operation (-55°C) is necessary. For new designs or regulated applications, 74HCT173D,653 is the preferred choice.

Q: Are there any package or pinout differences between these substitute parts?

A: All three parts use identical 16-SOIC (0.154", 3.90mm Width) surface mount packaging. Pinout and package footprint are equivalent, enabling direct PCB-level substitution without layout modifications.

Q: What is the difference between the 74HC85PW,118 listed in the original substitutes field?

A: The 74HC85PW,118 is a Magnitude Comparator, not a D-Type Flip Flop. This part does not meet the functional equivalence criteria for the CD74HCT173MT and is not a valid substitute for this application.