74HCT174N Equivalent & Substitute Parts

Part Overview

The 74HCT174N is a D-type flip-flop logic integrated circuit manufactured by NXP USA Inc., designed for digital signal processing and sequential logic applications. This device features 6-bit positive edge-triggered flip-flops with master reset functionality in a 16-DIP through-hole package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, repairs, and legacy design support. Substitute parts must maintain functional compatibility while meeting the same electrical and mechanical specifications required for direct board-level replacement.

Substiute Parts

74HCT174N,652

NXP USA Inc.In Stock: 85474HCT174N,652 Datasheet

Current PartRFQ

CD74HCT174E

Texas InstrumentsIn Stock: 1763CD74HCT174E Datasheet

DirectRFQ

SN74AHCT174N

Texas InstrumentsIn Stock: 2542SN74AHCT174N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HCT174N are qualified based on the following critical parameters that determine functional and physical compatibility:

Functional Compatibility Requirements:

• D-Type flip-flop architecture with 6-bit configuration
• Master reset function capability
• Positive edge trigger operation
• Non-inverted output type
• 4.5V to 5.5V supply voltage compatibility

Physical Compatibility Requirements:

• 16-DIP package format with 0.300" (7.62mm) pitch
• Through-hole mounting configuration
• Pin-to-pin compatible footprint

Regulatory Compliance:

• ROHS3 compliance
• REACH unaffected status
• EAR99 export classification

The substitute parts listed below meet all functional and physical requirements for direct replacement in applications where the 74HCT174N is specified.

Parameter Comparison

Engineering Selection Recommendations

CD74HCT174E (Texas Instruments): This part maintains the 74HCT series designation and is functionally equivalent to the 74HCT174N. It is currently in active production status, ensuring long-term availability for replacement applications. The device operates within the same supply voltage range and package configuration. The propagation delay specification of 40ns at 4.5V is within acceptable tolerance for most legacy 74HCT applications. This substitute is suitable for direct replacement in systems where the original 74HCT174N is no longer available.

SN74AHCT174N (Texas Instruments): This part represents an advanced variant within the AHCT logic family, offering improved performance characteristics including faster propagation delay (8.8ns at 5V) and lower quiescent current (4 µA). The device maintains pin-to-pin compatibility and operates within the same supply voltage range. The operating temperature range is -40°C to 85°C, which is narrower than the original part but covers standard industrial applications. This substitute is recommended for applications where improved speed performance is beneficial and the temperature range is acceptable.

Both substitute parts carry ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement and deployment.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT174E directly replace the 74HCT174N without circuit modifications?

A: Yes. The CD74HCT174E maintains identical pin configuration, package format, and functional specifications. Both devices are 16-DIP through-hole packages with the same electrical characteristics for supply voltage, output type, and trigger mechanism. Direct board-level substitution is supported.

Q: What are the key differences between the CD74HCT174E and SN74AHCT174N substitutes?

A: The primary differences are series designation and performance characteristics. The CD74HCT174E belongs to the 74HCT family with 25 MHz clock frequency, while the SN74AHCT174N is from the advanced 74AHCT family with 115 MHz clock frequency. The SN74AHCT174N offers faster propagation delay (8.8ns versus 40ns) and lower quiescent current (4 µA versus 8 µA). Both maintain the same 16-DIP package and supply voltage range.

Q: Is the SN74AHCT174N suitable for all applications requiring the 74HCT174N?

A: The SN74AHCT174N is pin-compatible and functionally compatible for most applications. However, the operating temperature range is -40°C to 85°C, which is narrower than the original 74HCT174N specification of -40°C to 125°C. Applications requiring operation above 85°C must use the CD74HCT174E or original 74HCT174N.

Q: Are both substitute parts available in the same packaging options as the original 74HCT174N?

A: Both substitute parts are supplied in 16-DIP through-hole packages with 0.300" (7.62mm) pitch, matching the original package specification. The CD74HCT174E is supplied in tube packaging, while the SN74AHCT174N is also supplied in tube packaging. Both are compatible with standard through-hole assembly processes.

Q: Do the substitute parts meet current regulatory compliance requirements?

A: Yes. Both the CD74HCT174E and SN74AHCT174N are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component procurement and use in regulated industries.

Q: What is the significance of the obsolete status of the 74HCT174N?

A: Obsolete status indicates that the original manufacturer (NXP USA Inc.) has discontinued production and support for this part. Substitute parts from active manufacturers ensure continued availability for system maintenance, repairs, and legacy design support without supply chain interruption.