74HCT14D,652 Equivalent & Substitute Parts

Part Overview

The 74HCT14D,652 is a 6-channel inverter IC with Schmitt trigger inputs manufactured by Nexperia USA Inc. in a 14-SOIC surface mount package. This logic component operates at 4.5V to 5.5V supply voltage and features hysteresis input characteristics suitable for signal conditioning applications. The part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Logic Type	Inverter with Schmitt Trigger
Number of Circuits	6
Number of Inputs	1
Supply Voltage Range	4.5V ~ 5.5V
Output Current (High/Low)	4mA / 4mA
Input Logic Level Low	0.5V ~ 0.6V
Input Logic Level High	1.9V ~ 2.1V
Max Propagation Delay	34ns @ 4.5V, 50pF
Operating Temperature	-40°C ~ 125°C
Package Type	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 74HCT14D,652 is determined by strict equivalence across the following critical parameters:

Logic type: Inverter with Schmitt trigger function
Circuit count: 6 channels
Input configuration: Single input per channel
Supply voltage compatibility: 4.5V ~ 5.5V operation
Package format: 14-SOIC surface mount
Input/output electrical thresholds: Matching logic levels and output drive capability
Operating temperature range: Minimum -40°C support required

Parts meeting these criteria are considered direct substitutes regardless of manufacturer, product status, or packaging format (tube, tape & reel, bulk). Propagation delay variations within the specified range do not preclude substitution. Temperature range extensions (e.g., -55°C lower limit) represent functional enhancements and do not restrict substitution eligibility.

Parameter Comparison

Part Number	Manufacturer	Supply Voltage	Output Current (H/L)	Propagation Delay	Temp Range	Package	Status
74HCT14D,652	Nexperia USA Inc.	4.5V ~ 5.5V	4mA / 4mA	34ns @ 4.5V	-40°C ~ 125°C	14-SOIC	Obsolete
74HCT14D,653	Nexperia USA Inc.	4.5V ~ 5.5V	4mA / 4mA	34ns @ 4.5V	-40°C ~ 125°C	14-SOIC	Active
CD74HCT14M	Texas Instruments	4.5V ~ 5.5V	4mA / 4mA	38ns @ 4.5V	-55°C ~ 125°C	14-SOIC	Discontinued
CD74HCT14M96	Harris Corporation	4.5V ~ 5.5V	4mA / 4mA	38ns @ 4.5V	-55°C ~ 125°C	14-SOIC	Obsolete
CD74HCT14MT	Texas Instruments	4.5V ~ 5.5V	4mA / 4mA	38ns @ 4.5V	-55°C ~ 125°C	14-SOIC	Discontinued
MC74HCT14ADG	onsemi	4.5V ~ 5.5V	4mA / 4mA	32ns @ 5V	-55°C ~ 125°C	14-SOIC	Active
MC74HCT14ADR2G	onsemi	4.5V ~ 5.5V	4mA / 4mA	32ns @ 5V	-55°C ~ 125°C	14-SOIC	Active
MM74HCT14M	Fairchild Semiconductor	4.5V ~ 5.5V	4.8mA / 4.8mA	20ns @ 5V	-40°C ~ 85°C	14-SOIC	Active
MM74HCT14MX	Fairchild Semiconductor	4.5V ~ 5.5V	4.8mA / 4.8mA	20ns @ 5V	-40°C ~ 85°C	14-SOIC	Active
SN74HCT14D	Texas Instruments	4.5V ~ 5.5V	4mA / 4mA	30ns @ 5.5V	-40°C ~ 85°C	14-SOIC	Obsolete
SN74HCT14DR	Texas Instruments	4.5V ~ 5.5V	4mA / 4mA	30ns @ 5.5V	-40°C ~ 85°C	14-SOIC	Active

Engineering Selection Recommendations

All listed parts are functionally equivalent substitutes for the 74HCT14D,652 based on electrical and mechanical parameter alignment. Selection should prioritize active product status for long-term availability and supply chain stability.

Recommended primary substitutes (Active status):

74HCT14D,653 (Nexperia) — Direct equivalent with identical electrical specifications and extended availability
SN74HCT14DR (Texas Instruments) — Active status with established supply chain
MC74HCT14ADR2G (onsemi) — Active status with extended temperature range (-55°C lower limit)

Secondary substitutes (Discontinued/Obsolete status):

CD74HCT14M, CD74HCT14MT (Texas Instruments) — Functionally compatible but discontinued
CD74HCT14M96 (Harris Corporation) — Functionally compatible but obsolete; RoHS non-compliant

Alternative substitutes with enhanced performance:

MM74HCT14M, MM74HCT14MX (Fairchild Semiconductor) — Faster propagation delay (20ns) and higher output current (4.8mA) but narrower temperature range (-40°C ~ 85°C)

All recommended substitutes maintain ROHS3 compliance and identical 14-SOIC package geometry. Propagation delay variations are within acceptable engineering tolerances for typical logic applications.

Frequently Asked Questions (FAQ)

Q: Can I use 74HCT14D,653 as a direct replacement for 74HCT14D,652?

A: Yes. Both parts are manufactured by Nexperia, share identical electrical specifications, and use the same 14-SOIC package. The primary difference is packaging format (tube vs. cut tape/digi-reel) and product status (obsolete vs. active). Electrical performance and pinout are equivalent.

Q: What is the difference between the onsemi MC74HCT14ADG and MC74HCT14ADR2G variants?

A: Both parts are electrically identical with matching specifications. The primary difference is packaging format: MC74HCT14ADG is supplied in tube packaging, while MC74HCT14ADR2G is supplied in tape & reel format. Selection depends on procurement and assembly requirements.

Q: Why do some substitutes show faster propagation delays (20ns vs. 34ns)?

A: Propagation delay variations reflect manufacturing process differences across suppliers. The Fairchild MM74HCT14M and MM74HCT14MX parts exhibit faster switching characteristics. These faster delays do not preclude substitution; they represent functional enhancements suitable for timing-critical applications.

Q: Are there any compliance or certification differences between substitutes?

A: Most substitutes maintain ROHS3 compliance. The CD74HCT14M96 (Harris Corporation) is RoHS non-compliant and should be avoided in applications requiring RoHS certification. All other listed parts meet ROHS3 and REACH standards.

Q: Can I use parts with extended temperature ranges (-55°C to 125°C) in place of the original -40°C to 125°C specification?

A: Yes. Extended temperature range capability represents a functional enhancement and does not restrict substitution. Parts such as CD74HCT14M, CD74HCT14MT, MC74HCT14ADG, and MC74HCT14ADR2G with -55°C lower limits are fully compatible with applications requiring -40°C minimum operation.

Q: What should I consider when choosing between active and obsolete substitute parts?

A: Active parts (74HCT14D,653, SN74HCT14DR, MC74HCT14ADG, MC74HCT14ADR2G, MM74HCT14M, MM74HCT14MX) offer superior long-term availability and supply chain stability. Obsolete or discontinued parts should be used only when active alternatives are unavailable or when existing inventory must be consumed.

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