74HCT175N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT175N,652 is a D-type flip-flop logic integrated circuit manufactured by NXP USA Inc., designed for digital signal processing and sequential logic applications. This component features 1 element with 4-bit configuration, positive edge triggering, and complementary output type. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance, repair, and redesign efforts.

Substiute Parts

74HCT175N,652

NXP USA Inc.In Stock: 116274HCT175N,652 Datasheet

Current PartRFQ

CD74HCT175E

Texas InstrumentsIn Stock: 2438CD74HCT175E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HCT175N,652 is determined by strict alignment with the following critical parameters:

Mandatory Matching Parameters:

• Series designation (74HCT)
• Type (D-Type Flip Flop)
• Number of Elements (1)
• Number of Bits per Element (4)
• Output Type (Complementary)
• Trigger Type (Positive Edge)
• Package Type (16-DIP, 0.300", 7.62mm)
• Voltage Supply Range (4.5V ~ 5.5V)
• Current Output specifications (4mA / 4mA)
• Quiescent Current (8 µA)

Allowable Variation Parameters:

• Clock Frequency (minimum 25 MHz acceptable; original 49 MHz)
• Max Propagation Delay (33 ns specification maintained)
• Input Capacitance (variation acceptable within functional tolerance)
• Operating Temperature Range (extended range acceptable)
• Product Status (Active status preferred for availability)
• Packaging format (Tube acceptable alternative to standard packaging)

The CD74HCT175E from Texas Instruments qualifies as a direct substitute based on identical functional specifications, package configuration, and electrical characteristics within allowable tolerances.

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT175E from Texas Instruments is the qualified substitute for the obsolete 74HCT175N,652. Selection rationale is based on the following engineering criteria:

Functional Equivalence: Both parts maintain identical logic function, pin configuration, and electrical interface specifications. The 16-DIP through-hole package ensures direct socket compatibility without PCB redesign.

Compliance Alignment: Both components meet ROHS3 compliance requirements and maintain identical supply voltage specifications (4.5V ~ 5.5V), ensuring regulatory and operational compatibility in existing designs.

Active Product Status: The CD74HCT175E is currently in active production by Texas Instruments, providing assured long-term availability and supply chain continuity compared to the obsolete NXP part.

Parameter Tolerance: The CD74HCT175E operates within acceptable electrical tolerances. The reduced clock frequency specification (25 MHz versus 49 MHz) and increased input capacitance (10 pF versus 3.5 pF) do not compromise functionality in standard sequential logic applications where the original part was deployed.

Extended Temperature Range: The CD74HCT175E supports an extended operating temperature range (-55°C ~ 125°C), providing enhanced environmental performance compared to the original specification.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT175E directly replace the 74HCT175N,652 without circuit modification?

A: Yes. Both parts share identical pin assignments, package configuration (16-DIP), and core electrical specifications. Direct socket substitution is possible without PCB redesign or circuit alteration.

Q: What is the significance of the different clock frequency ratings (49 MHz vs. 25 MHz)?

A: The clock frequency specification indicates the maximum operating speed. The CD74HCT175E's 25 MHz rating is sufficient for standard sequential logic applications. If your circuit operates below 25 MHz, the substitute performs identically. If your design requires operation above 25 MHz, the CD74HCT175E may not be suitable.

Q: Does the higher input capacitance (10 pF vs. 3.5 pF) on the CD74HCT175E affect circuit performance?

A: Input capacitance affects signal rise/fall times and may introduce minor timing variations in high-speed applications. For most standard logic circuits, this difference is negligible. High-speed designs should evaluate timing margins against the 33 ns propagation delay specification common to both parts.

Q: Why is the CD74HCT175E listed as Active while the original part is Obsolete?

A: The 74HCT175N,652 has been discontinued by NXP USA Inc. The CD74HCT175E remains in active production by Texas Instruments, ensuring continued availability and supply chain reliability for new designs and legacy system maintenance.

Q: Are both parts RoHS compliant?

A: Yes. Both the 74HCT175N,652 and CD74HCT175E meet ROHS3 compliance standards, ensuring compatibility with environmental and regulatory requirements.

Q: What packaging formats are available for the CD74HCT175E?

A: The CD74HCT175E is supplied in Tube packaging. The 16-DIP (0.300", 7.62mm) package configuration remains identical to the original part, maintaining through-hole mounting compatibility.