74HCT173N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT173N,652 is a D-Type flip-flop logic integrated circuit manufactured by NXP USA Inc., designed for 4-bit parallel data storage with positive edge triggering and tri-state output capability. This component operates within the 74HCT logic family standard and is housed in a 16-DIP through-hole package. The part is currently classified as obsolete, making identification of functionally equivalent substitutes essential for system maintenance, repair, and legacy design support.

Substiute Parts

74HCT173N,652

NXP USA Inc.In Stock: 115674HCT173N,652 Datasheet

Current PartRFQ

CD74HCT173E

Harris CorporationIn Stock: 2083CD74HCT173E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HCT173N,652 is determined by strict adherence to the following core parameters:

Critical Matching Parameters:

• Logic family: 74HCT series
• Function: D-Type flip-flop with master reset capability
• Configuration: Single element, 4-bit storage
• Output architecture: Tri-state, non-inverted
• Trigger mechanism: Positive edge
• Package format: 16-DIP (0.300", 7.62mm)
• Mounting technology: Through hole
• Supply voltage range: 4.5V ~ 5.5V
• Temperature operating range: Minimum -40°C or lower, maximum 125°C or higher

The CD74HCT173E qualifies as a direct functional substitute based on matching all critical parameters. Both parts share identical logic family designation, flip-flop architecture, bit configuration, output type, trigger mechanism, package specification, and supply voltage requirements. Differences in secondary parameters such as clock frequency, propagation delay specifications, quiescent current, and input capacitance do not preclude substitution when the primary functional and electrical requirements are met.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (74HCT173N,652 - NXP USA Inc.): The original NXP part is classified as obsolete. Current inventory availability is limited to existing stock (1117 pcs reported). This part carries RoHS3 compliance certification and REACH unaffected status, meeting modern environmental and regulatory requirements. Selection of this part is appropriate only when existing stock is accessible and regulatory compliance documentation is required.

Substitute Part (CD74HCT173E - Harris Corporation): The Harris CD74HCT173E provides functional equivalence across all critical logic and electrical parameters. This part is also classified as obsolete but maintains higher current inventory levels (2071 pcs reported). The Harris part is RoHS non-compliant and does not carry REACH certification, which may present regulatory constraints in applications subject to environmental compliance mandates. The extended operating temperature range (-55°C minimum versus -40°C) provides additional thermal margin for applications requiring operation at lower ambient temperatures. Higher quiescent current (8 µA versus 4 µA) and input capacitance (10 pF versus 3.5 pF) are secondary considerations that do not affect functional substitution in standard logic applications.

Selection Criteria:

• Choose the NXP part when RoHS3 compliance and REACH certification are mandatory requirements.
• Choose the Harris part when extended low-temperature operation (-55°C) is required and regulatory compliance is not a constraint.
• Both parts are suitable for direct pin-for-pin replacement in 16-DIP through-hole circuit board designs.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT173E directly replace the 74HCT173N,652 in an existing circuit?

A: Yes. Both parts share identical pinout, package footprint, logic family designation, and core electrical specifications. Direct pin-for-pin replacement is supported without circuit modification. Verify that regulatory compliance requirements (RoHS, REACH) do not restrict use of the Harris part in your application.

Q: What is the significance of the different clock frequency ratings (80 MHz vs. 60 MHz)?

A: The NXP part is rated for 80 MHz maximum clock frequency, while the Harris part is rated for 60 MHz. In applications operating below 60 MHz, both parts are functionally equivalent. Applications requiring operation between 60 MHz and 80 MHz must use the NXP part. Most legacy logic applications operate well below these frequencies, making this difference non-critical for typical substitution scenarios.

Q: Why does the Harris part have higher quiescent current (8 µA vs. 4 µA)?

A: Quiescent current variation reflects manufacturing process differences between NXP and Harris. The 4 µA difference is negligible in most applications. This becomes relevant only in ultra-low-power designs where every microampere of standby current is critical. For standard logic applications, this difference does not affect system performance.

Q: Are there any temperature-related constraints when substituting these parts?

A: The Harris part extends the minimum operating temperature to -55°C compared to the NXP part's -40°C minimum. Both parts support the same maximum temperature of 125°C. If your application requires operation below -40°C, the Harris part provides additional thermal margin. Standard industrial and commercial applications typically operate within the -40°C to 125°C range, where both parts are equivalent.

Q: What does "RoHS non-compliant" mean for the Harris part?

A: The Harris CD74HCT173E does not meet RoHS (Restriction of Hazardous Substances) compliance standards. If your application, customer, or regulatory jurisdiction requires RoHS certification, you must use the NXP part. Verify compliance requirements before selecting the Harris substitute.

Q: Can I use either part interchangeably in a design that will be manufactured in volume?

A: Both parts are classified as obsolete, meaning neither manufacturer actively produces them. Volume manufacturing should not rely on either part. For new designs, evaluate modern logic family alternatives such as 74LVC or 74AUC series, which offer active production status, improved power efficiency, and broader availability. For legacy system repairs or limited-quantity applications, either part may be used subject to compliance and availability constraints.

Q: What is the difference between the NXP packaging designation "16-DIP" and the Harris designation "16-PDIP"?

A: Both designations refer to the same physical package: a 16-pin dual inline package with 0.300-inch (7.62mm) row spacing. The "P" in "16-PDIP" indicates plastic material, which is standard for both parts. The packages are mechanically and electrically identical, supporting direct substitution.