74HCT14N Equivalent & Substitute Parts

Part Overview

The 74HCT14N is a 6-channel inverter IC with Schmitt trigger inputs in a 14-DIP package, manufactured by NXP USA Inc. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74HCT14 series provides logic inversion with hysteresis characteristics suitable for signal conditioning and digital logic applications. Substitute parts must maintain functional equivalence across electrical specifications, package compatibility, and operating parameters.

Substiute Parts

74HCT14N,652

NXP USA Inc.In Stock: 82874HCT14N,652 Datasheet

Current PartRFQ

SN74HCT14N

Texas InstrumentsIn Stock: 4995SN74HCT14N Datasheet

DirectRFQ

CD74HCT14E

Harris CorporationIn Stock: 2187CD74HCT14E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HCT14N is determined by the following criteria:

Electrical Compatibility Requirements:

• Identical logic type (Inverter with Schmitt Trigger)
• Matching circuit count (6 channels) and input configuration (1 input per channel)
• Supply voltage range: 4.5V ~ 5.5V
• Quiescent current maximum: 2 µA
• Output current capability: 4mA minimum for both high and low states
• Input logic thresholds: Low 0.5V ~ 0.6V, High 1.9V ~ 2.1V

Package Compatibility Requirements:

• 14-DIP package format (0.300", 7.62mm pitch)
• Through-hole mounting configuration

Acceptable Variations:

• Propagation delay specifications may vary within acceptable limits for the 74HCT logic family
• Operating temperature range may extend beyond the original specification
• Product status (active or obsolete) does not disqualify a substitute
• RoHS compliance status may differ

Parameter Comparison

Engineering Selection Recommendations

SN74HCT14N (Texas Instruments) is the primary substitute for the 74HCT14N. This part maintains full electrical equivalence across all critical parameters and is currently in active production status, ensuring long-term availability. The SN74HCT14N meets ROHS3 compliance requirements and provides superior propagation delay performance (30ns vs. 34ns). The operating temperature range is limited to -40°C ~ 85°C compared to the original specification of -40°C ~ 125°C; this restriction applies only to high-temperature applications exceeding 85°C.

CD74HCT14E (Harris Corporation) is an alternative substitute that maintains full electrical equivalence and extends the operating temperature range to -55°C ~ 125°C. However, this part is obsolete and does not meet RoHS3 compliance requirements. Selection of the CD74HCT14E is appropriate only for applications requiring extended temperature operation below -40°C or above 85°C, where RoHS compliance is not mandated.

For standard applications within the -40°C ~ 85°C temperature range where RoHS compliance is required, the SN74HCT14N is the recommended selection.

Frequently Asked Questions (FAQ)

Q: Can the SN74HCT14N directly replace the 74HCT14N without circuit modifications?

A: Yes. The SN74HCT14N is electrically and mechanically equivalent to the 74HCT14N across all specified parameters. Direct substitution on the PCB is possible without design changes. The 14-DIP package pinout is identical, and electrical characteristics match the original specification.

Q: What is the difference between 14-DIP and 14-PDIP packaging?

A: Both designations refer to the same 14-pin dual inline package with 0.300" (7.62mm) pitch. The "P" in PDIP indicates plastic material. These packages are mechanically and electrically interchangeable.

Q: Why is the operating temperature range different between the SN74HCT14N and the original 74HCT14N?

A: The SN74HCT14N is specified for -40°C ~ 85°C operation, while the 74HCT14N supports -40°C ~ 125°C. This reflects the manufacturer's tested and validated operating range for each part. For applications requiring operation above 85°C, the CD74HCT14E supports the extended range to 125°C.

Q: Is RoHS compliance important for my application?

A: RoHS3 compliance is mandatory for products sold in the European Union and many other markets. The SN74HCT14N meets ROHS3 requirements, while the CD74HCT14E does not. Verify your application's regulatory requirements before selecting a substitute.

Q: What is the propagation delay specification, and why does it vary between parts?

A: Propagation delay is the time required for a logic state change at the input to produce a corresponding change at the output. The 74HCT14N specifies 34ns at 4.5V with 50pF load, the SN74HCT14N specifies 30ns at 5.5V with 50pF load, and the CD74HCT14E specifies 38ns at 4.5V with 50pF load. These variations are within acceptable limits for the 74HCT logic family and do not affect functional compatibility in standard applications.

Q: Can I use the CD74HCT14E if RoHS compliance is not required?

A: Yes. The CD74HCT14E is electrically equivalent and provides extended temperature operation. However, availability may be limited due to obsolete status. Verify stock availability with your supplier before committing to this part for new designs.