74VHCT14ASJ Equivalent & Substitute Parts

Part Overview

The 74VHCT14ASJ is a 6-channel inverter IC with Schmitt trigger inputs manufactured by onsemi in a 14-SOP package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74VHCT14 series provides logic inversion with hysteresis 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 (0.209", 5.30mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74VHCT14ASJ is determined by the following criteria:

Electrical Compatibility Requirements:

Logic Type: Inverter with 6 channels, 1 input per channel
Schmitt trigger functionality
Supply voltage range: 4.5V ~ 5.5V
Output current capability: 8mA minimum (high and low)
Input logic levels: Low 0.5V ~ 0.6V, High 1.9V ~ 2.1V
Quiescent current: 2 µA maximum

Mechanical Compatibility Requirements:

Surface mount technology
14-pin package (SOIC or SOP variants with compatible pinout)
Moisture sensitivity level 1 (unlimited shelf life)

Acceptable Variations:

Propagation delay: 8ns to 9.6ns (faster performance acceptable)
Operating temperature range: -40°C ~ 85°C minimum (extended ranges acceptable)
Packaging format: Tube, Tape & Reel, Bulk, or Cut Tape acceptable
Product status: Active or discontinued acceptable for substitution purposes
Manufacturer: onsemi, Texas Instruments, or NXP Semiconductors

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuits	Supply Voltage	Quiescent Current (Max)	Output Current (High/Low)	Propagation Delay @ 5V, 50pF	Operating Temperature	Package	Product Status
74VHCT14ASJ	onsemi	Inverter	6	4.5V ~ 5.5V	2 µA	8mA, 8mA	9.6ns	-40°C ~ 85°C	14-SOP	Obsolete
MC74VHCT14ADR2G	onsemi	Inverter	6	4.5V ~ 5.5V	2 µA	8mA, 8mA	9.6ns	-55°C ~ 125°C	14-SOIC	Active
74AHCT14D,112	NXP Semiconductors	Inverter	6	4.5V ~ 5.5V	2 µA	8mA, 8mA	Not specified	Not specified	Bulk	Active
74AHCT14D,118	NXP Semiconductors	Inverter	6	4.5V ~ 5.5V	2 µA	8mA, 8mA	Not specified	Not specified	Bulk	Active
SN74AHCT14D	Texas Instruments	Inverter	6	4.5V ~ 5.5V	2 µA	8mA, 8mA	8ns	-40°C ~ 85°C	14-SOIC	Discontinued at DiGi Electronics
SN74AHCT14DR	Texas Instruments	Inverter	6	4.5V ~ 5.5V	2 µA	8mA, 8mA	8ns	-40°C ~ 85°C	14-SOIC	Active
SN74AHCT14NSR	Texas Instruments	Inverter	6	4.5V ~ 5.5V	2 µA	8mA, 8mA	8ns	-40°C ~ 85°C	14-SO	Active
SN74AHCT14QDRQ1	Texas Instruments	Inverter	6	4.5V ~ 5.5V	2 µA	8mA, 8mA	8ns	-40°C ~ 125°C	14-SOIC	Active

Engineering Selection Recommendations

Primary Substitute (Recommended): MC74VHCT14ADR2G from onsemi maintains the same manufacturer lineage as the 74VHCT14ASJ. This part is active in production, offers identical electrical specifications, and provides an extended operating temperature range (-55°C ~ 125°C). The 14-SOIC package is mechanically compatible with the original 14-SOP footprint for most applications. RoHS3 compliance is confirmed.

Secondary Substitutes (Texas Instruments): SN74AHCT14DR and SN74AHCT14QDRQ1 are active Texas Instruments alternatives. Both deliver faster propagation delay (8ns versus 9.6ns), which is acceptable for signal conditioning applications. SN74AHCT14QDRQ1 includes AEC-Q100 automotive qualification and extended temperature range (-40°C ~ 125°C), suitable for automotive and industrial environments. Both carry RoHS3 compliance.

Tertiary Substitutes (NXP Semiconductors): 74AHCT14D,112 and 74AHCT14D,118 from NXP are active alternatives with confirmed electrical compatibility. These bulk-packaged options provide cost-effective solutions for high-volume applications. Detailed propagation delay and temperature specifications are not provided in available documentation.

Compatibility Considerations: All listed substitutes maintain the 6-channel inverter configuration with Schmitt trigger inputs and identical supply voltage requirements. Package variations (14-SOP, 14-SOIC, 14-SO) are mechanically interchangeable in standard surface-mount applications. All parts carry MSL 1 rating and REACH compliance.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74VHCT14ASJ with MC74VHCT14ADR2G? A: Yes. Both parts share identical electrical specifications, Schmitt trigger functionality, and supply voltage requirements. The 14-SOIC package is mechanically compatible with the original 14-SOP footprint. MC74VHCT14ADR2G is currently in active production.

Q: What is the difference between 14-SOP and 14-SOIC packages? A: Both are 14-pin surface-mount packages with compatible pinouts for this logic function. The primary difference is body width: 14-SOP measures 5.30mm while 14-SOIC measures 3.90mm. Standard PCB footprints accommodate both variants.

Q: Are the Texas Instruments SN74AHCT14 variants fully compatible? A: Yes. SN74AHCT14D, SN74AHCT14DR, SN74AHCT14NSR, and SN74AHCT14QDRQ1 all meet the electrical requirements for substitution. SN74AHCT14DR and SN74AHCT14NSR are currently active. Propagation delay is faster (8ns) than the original specification (9.6ns), which is acceptable for most applications.

Q: Which substitute offers the widest operating temperature range? A: MC74VHCT14ADR2G and SN74AHCT14QDRQ1 both support -55°C ~ 125°C or -40°C ~ 125°C respectively, compared to the original -40°C ~ 85°C range. SN74AHCT14QDRQ1 includes AEC-Q100 automotive qualification.

Q: Are all substitutes RoHS compliant? A: Yes. MC74VHCT14ADR2G, SN74AHCT14D, SN74AHCT14DR, SN74AHCT14NSR, and SN74AHCT14QDRQ1 all carry RoHS3 compliance certification.

Q: What packaging formats are available for substitutes? A: Substitutes are available in Tape & Reel (TR), Cut Tape (CT), Tube, and Bulk formats. Selection depends on production volume and supply chain requirements.

Q: Can I use NXP 74AHCT14D variants as substitutes? A: Yes. 74AHCT14D,112 and 74AHCT14D,118 meet electrical compatibility requirements. Both are active in production and available in bulk packaging for high-volume applications.

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