74VHCT14AMX Equivalent & Substitute Parts

Part Overview

The 74VHCT14AMX is a 6-channel inverter IC with Schmitt trigger inputs manufactured by onsemi in a 14-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74VHCT14 series provides logic inversion with hysteresis input characteristics suitable for signal conditioning applications requiring noise immunity.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Features	Schmitt Trigger
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	8mA, 8mA
Input Logic Level - Low	0.5V ~ 0.6V
Input Logic Level - High	1.9V ~ 2.1V
Max Propagation Delay @ 5V, 50pF	9.6ns
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74VHCT14AMX is determined by the following criteria:

Core Functional Parameters:

Logic type (Inverter)
Number of circuits (6)
Number of inputs (1)
Schmitt trigger feature
Supply voltage range (4.5V ~ 5.5V)
Output current capability (8mA, 8mA)
Input logic levels (0.5V ~ 0.6V low, 1.9V ~ 2.1V high)
Package type (14-SOIC surface mount)

Acceptable Variations:

Propagation delay: Substitute parts may have equal or faster propagation delay (8ns or 9.6ns)
Operating temperature: Substitute parts may have extended temperature range (-55°C ~ 125°C)
Product status: Active parts are preferred over obsolete parts
Packaging format: Cut Tape, Tape & Reel, Tube, or Bulk formats are interchangeable for the same package type

Substitute parts are grouped into two categories: direct equivalents from alternative manufacturers (Texas Instruments 74AHCT14 series) and similar parts from the same manufacturer (onsemi 74VHCT14 variants).

Parameter Comparison

Part Number	Manufacturer	Series	Status	Voltage Supply	Propagation Delay	Temp Range	Package	Packaging Format
74VHCT14AMX	onsemi	74VHCT	Obsolete	4.5V ~ 5.5V	9.6ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC	Cut Tape (CT) & Digi-Reel®
MC74VHCT14ADR2G	onsemi	74VHCT	Active	4.5V ~ 5.5V	9.6ns @ 5V, 50pF	-55°C ~ 125°C	14-SOIC	Tape & Reel (TR)
SN74AHCT14DR	Texas Instruments	74AHCT	Active	4.5V ~ 5.5V	8ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC	Cut Tape (CT) & Digi-Reel®
74AHCT14D,112	NXP Semiconductors	74AHCT	Active	Not specified	Not specified	Not specified	Not specified	Bulk
74AHCT14D,118	NXP Semiconductors	74AHCT	Active	Not specified	Not specified	Not specified	Not specified	Bulk
74VHCT14D,118	NXP USA Inc.	74VHCT	Active	4.5V ~ 5.5V	8ns @ 5V, 50pF	-40°C ~ 125°C	14-SOIC	Bulk
SN74AHCT14D	Texas Instruments	74AHCT	Discontinued at DiGi Electronics	4.5V ~ 5.5V	8ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC	Tube
SN74AHCT14MDREP	Texas Instruments	74AHCT	Active	4.5V ~ 5.5V	8ns @ 5V, 50pF	-55°C ~ 125°C	14-SOIC	Tape & Reel (TR)
SN74AHCT14NSR	Texas Instruments	74AHCT	Active	4.5V ~ 5.5V	8ns @ 5V, 50pF	-40°C ~ 85°C	14-SO	Tape & Reel (TR)
SN74AHCT14QDRG4Q1	Texas Instruments	74AHCT	Active	4.5V ~ 5.5V	8ns @ 5V, 50pF	-40°C ~ 125°C	14-SOIC	Cut Tape (CT) & Digi-Reel®
SN74AHCT14QDRQ1	Texas Instruments	74AHCT	Active	4.5V ~ 5.5V	8ns @ 5V, 50pF	-40°C ~ 125°C	14-SOIC	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

MC74VHCT14ADR2G from onsemi maintains the same series designation and electrical characteristics as the 74VHCT14AMX. This part is active and available in Tape & Reel format with extended operating temperature range (-55°C ~ 125°C). It is ROHS3 compliant and carries unlimited moisture sensitivity rating.

SN74AHCT14DR from Texas Instruments is an active alternative with identical supply voltage, output current, and input logic levels. It offers faster propagation delay (8ns versus 9.6ns) and is available in Cut Tape & Digi-Reel format matching the original packaging style.

Secondary Substitutes (Extended Temperature Range):

SN74AHCT14MDREP and SN74AHCT14QDRQ1 from Texas Instruments provide extended operating temperature range (-55°C ~ 125°C) with faster propagation delay (8ns). Both are active products with ROHS3 compliance. SN74AHCT14QDRQ1 includes AEC-Q100 automotive qualification.

SN74AHCT14QDRG4Q1 offers automotive-grade qualification (AEC-Q100) with extended temperature range, suitable for applications requiring automotive reliability standards.

Considerations for NXP Parts:

74AHCT14D,112 and 74AHCT14D,118 from NXP Semiconductors are active alternatives available in bulk packaging. Complete electrical parameter specifications are not provided in the available data. Verification of electrical characteristics against design requirements is necessary before selection.

74VHCT14D,118 from NXP USA Inc. maintains the 74VHCT series designation with extended operating temperature range (-40°C ~ 125°C) and faster propagation delay (8ns). This part is available in bulk format.

Discontinued Part:

SN74AHCT14D from Texas Instruments is discontinued at DiGi Electronics and should not be selected for new designs despite active status at other distributors.

Frequently Asked Questions (FAQ)

Q: Can I use SN74AHCT14DR as a direct replacement for 74VHCT14AMX?

A: Yes. Both parts meet the core functional requirements: 6-channel inverter with Schmitt trigger, 4.5V ~ 5.5V supply, 8mA output current, and 14-SOIC package. The SN74AHCT14DR offers faster propagation delay (8ns versus 9.6ns), which is compatible with the original specification. Both are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between 74VHCT and 74AHCT series?

A: Both series provide identical logic function and electrical characteristics for this application. The 74VHCT series is manufactured by onsemi and NXP, while 74AHCT is manufactured by Texas Instruments. All meet the same supply voltage, output current, and input logic level specifications.

Q: Does packaging format affect electrical performance?

A: No. Cut Tape, Tape & Reel, Tube, and Bulk formats contain the same die and provide identical electrical performance. Format selection depends on assembly process requirements and order quantity.

Q: Why do some substitute parts have faster propagation delay?

A: Faster propagation delay (8ns versus 9.6ns) represents improved performance and is fully compatible with designs specified for 9.6ns. This does not create timing conflicts in applications where the original part was acceptable.

Q: Can I use parts with extended temperature range (-55°C ~ 125°C) in place of -40°C ~ 85°C parts?

A: Yes. Extended temperature range parts are fully compatible with designs specified for narrower temperature ranges. The part will operate correctly within the original temperature specification.

Q: What does AEC-Q100 qualification mean?

A: AEC-Q100 is an automotive industry qualification standard. Parts with this qualification (SN74AHCT14QDRG4Q1 and SN74AHCT14QDRQ1) meet additional reliability and testing requirements for automotive applications. These parts are suitable for both automotive and general industrial use.

Q: Are NXP bulk parts suitable for production use?

A: NXP bulk parts (74AHCT14D,112, 74AHCT14D,118, 74VHCT14D,118) are active products with high inventory availability. However, complete electrical parameter specifications are not provided in the available data. Obtain full datasheets from NXP to verify all electrical characteristics match design requirements before committing to production quantities.

Q: Which substitute offers the best availability?

A: MC74VHCT14ADR2G (3020 pcs), SN74AHCT14DR (3300 pcs), SN74AHCT14QDRG4Q1 (3400 pcs), and SN74AHCT14QDRQ1 (3584 pcs) all have substantial inventory. NXP bulk parts show the highest inventory levels (84490 pcs for 74AHCT14D,112 and 9307 pcs for 74AHCT14D,118).

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