74VHCT14ASJX Equivalent & Substitute Parts

Part Overview

The 74VHCT14ASJX is a 6-channel inverter IC with Schmitt trigger inputs manufactured by onsemi in a 14-SOP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The 74VHCT14ASJX operates within the 4.5V to 5.5V supply voltage range and is suitable for logic-level signal inversion applications requiring hysteresis characteristics.

Key Parameters

Parameter	Value
Manufacturer Part Number	74VHCT14ASJX
Manufacturer	onsemi
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 @ V, Max CL	9.6ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the 74VHCT14ASJX is determined by the following critical parameters:

Logic type: Inverter with 6 channels and Schmitt trigger functionality
Electrical specifications: 4.5V to 5.5V supply voltage, 2 µA maximum quiescent current, 8mA output drive capability
Input logic levels: 0.5V–0.6V (low) and 1.9V–2.1V (high)
Operating temperature range: -40°C to 85°C
Package compatibility: 14-SOIC surface mount packages with equivalent pin configurations
Moisture sensitivity: MSL 1 (Unlimited)

The substitute parts listed below maintain electrical equivalence across these parameters. Variations in propagation delay (8ns versus 9.6ns) and package width dimensions (0.154" versus 0.209") do not affect functional substitution within the specified operating conditions.

Parameter Comparison

Parameter	74VHCT14ASJX (onsemi)	74AHCT14D,112 (NXP)	74AHCT14D,118 (NXP)	SN74AHCT14D (TI)	SN74AHCT14DR (TI)	SN74AHCT14NSR (TI)	SN74AHCT14QDRQ1 (TI)
Logic Type	Inverter	Inverter	Inverter	Inverter	Inverter	Inverter	Inverter
Number of Circuits	6	6	6	6	6	6	6
Number of Inputs	1	1	1	1	1	1	1
Features	Schmitt Trigger	Schmitt Trigger	Schmitt Trigger	Schmitt Trigger	Schmitt Trigger	Schmitt Trigger	Schmitt Trigger
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA	2 µA	2 µA	2 µA	2 µA	2 µA	2 µA
Current - Output High, Low	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA
Input Logic Level - Low	0.5V ~ 0.6V	0.5V ~ 0.6V	0.5V ~ 0.6V	0.5V ~ 0.6V	0.5V ~ 0.6V	0.5V ~ 0.6V	0.5V ~ 0.6V
Input Logic Level - High	1.9V ~ 2.1V	1.9V ~ 2.1V	1.9V ~ 2.1V	1.9V ~ 2.1V	1.9V ~ 2.1V	1.9V ~ 2.1V	1.9V ~ 2.1V
Max Propagation Delay @ V, Max CL	9.6ns @ 5V, 50pF	Not specified	Not specified	8ns @ 5V, 50pF	8ns @ 5V, 50pF	8ns @ 5V, 50pF	8ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C	Not specified	Not specified	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Discontinued at DiGi Electronics	Active	Active	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For applications currently using the 74VHCT14ASJX, the following substitute parts are recommended based on product status and compliance:

Primary Substitutes (Active Status):

SN74AHCT14DR (Texas Instruments): Active product status with standard operating temperature range (-40°C to 85°C). Available in Cut Tape and Digi-Reel packaging.
SN74AHCT14NSR (Texas Instruments): Active product status with standard operating temperature range. Available in Tape & Reel packaging.
74AHCT14D,112 (NXP Semiconductors): Active product status. Available in bulk packaging with high inventory levels.
74AHCT14D,118 (NXP Semiconductors): Active product status. Available in bulk packaging.

Extended Temperature Substitute (Automotive Grade):

SN74AHCT14QDRQ1 (Texas Instruments): Active product status with extended operating temperature range (-40°C to 125°C) and AEC-Q100 automotive qualification. Suitable for applications requiring higher temperature performance.

Discontinued Substitute:

SN74AHCT14D (Texas Instruments): Discontinued at DiGi Electronics but functionally equivalent. Use only if inventory is available and long-term supply is not a concern.

All substitute parts maintain electrical equivalence with the original 74VHCT14ASJX across the specified operating conditions and are REACH compliant with MSL 1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the 74VHCT14ASJX with any of the listed substitutes?

A: Yes, all listed substitute parts are electrically equivalent and maintain the same pin configuration in 14-SOIC packages. The 74AHCT14 series substitutes are pin-compatible with the 74VHCT14ASJX and require no circuit modifications.

Q: What is the difference between the NXP and Texas Instruments substitutes?

A: Both manufacturers produce functionally equivalent 74AHCT14 inverter ICs with identical electrical specifications. The primary differences are packaging options (bulk versus tape & reel) and product availability. Texas Instruments offers an automotive-grade variant (SN74AHCT14QDRQ1) with extended temperature range.

Q: Does the package width difference (0.154" versus 0.209") affect compatibility?

A: No. Both 14-SOIC package widths are standard surface mount packages with identical pin spacing and electrical characteristics. The width difference does not affect PCB layout compatibility or electrical performance.

Q: Why is the 74VHCT14ASJX listed as obsolete?

A: The 74VHCT14ASJX is an older onsemi product. The 74AHCT14 series from Texas Instruments and NXP Semiconductors are actively manufactured alternatives that provide equivalent functionality with ongoing supply availability.

Q: Can I use the SN74AHCT14QDRQ1 in non-automotive applications?

A: Yes. The SN74AHCT14QDRQ1 is AEC-Q100 qualified and rated for -40°C to 125°C operation, making it suitable for any application within this temperature range. It is a superset of the standard -40°C to 85°C specification.

Q: What is the significance of the propagation delay difference (8ns versus 9.6ns)?

A: The 8ns propagation delay of the 74AHCT14 substitutes is faster than the 9.6ns specification of the 74VHCT14ASJX. This represents an improvement in switching speed and does not create compatibility issues in applications designed for the original part.

Q: Are all substitute parts RoHS compliant?

A: The Texas Instruments substitutes (SN74AHCT14D, SN74AHCT14DR, SN74AHCT14NSR, SN74AHCT14QDRQ1) are ROHS3 compliant. NXP part compliance information is not specified in the provided data. Verify RoHS status with your supplier if this is a requirement for your application.

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