74VHCT14AM Equivalent & Substitute Parts

Part Overview

The 74VHCT14AM 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 74VHCT14AM operates within a 4.5V to 5.5V supply voltage range and is designed for logic inversion applications requiring hysteresis input characteristics.

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 74VHCT14AM is determined by the following critical parameters:

Logic type (Inverter with Schmitt trigger)
Circuit count (6 channels)
Input count (1 input per channel)
Supply voltage range (4.5V ~ 5.5V)
Output current capability (8mA minimum)
Input logic levels (0.5V ~ 0.6V low, 1.9V ~ 2.1V high)
Propagation delay performance (≤9.6ns @ 5V, 50pF)
Operating temperature range (-40°C minimum to 85°C minimum)
Package compatibility (14-SOIC or 14-SO)
RoHS3 compliance

Substitute parts are grouped into two categories: direct equivalents from the 74VHCT series (NXP USA Inc.) and compatible alternatives from the 74AHCT series (Texas Instruments, NXP Semiconductors). Both series meet the electrical specifications of the original part.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Supply Voltage	Quiescent Current (Max)	Output Current	Propagation Delay @ 5V, 50pF	Operating Temp Range	Package	RoHS3
74VHCT14AM	onsemi	74VHCT	Obsolete	4.5V ~ 5.5V	2 µA	8mA, 8mA	9.6ns	-40°C ~ 85°C	14-SOIC	Yes
74VHCT14D,118	NXP USA Inc.	74VHCT	Active	4.5V ~ 5.5V	2 µA	8mA, 8mA	8ns	-40°C ~ 125°C	14-SO	Not specified
74AHCT14D,112	NXP Semiconductors	74AHCT	Active	4.5V ~ 5.5V	2 µA	8mA, 8mA	8ns	Not specified	Not specified	Not specified
74AHCT14D,118	NXP Semiconductors	74AHCT	Active	4.5V ~ 5.5V	2 µA	8mA, 8mA	8ns	Not specified	Not specified	Not specified
SN74AHCT14D	Texas Instruments	74AHCT	Discontinued at DiGi Electronics	4.5V ~ 5.5V	2 µA	8mA, 8mA	8ns	-40°C ~ 85°C	14-SOIC	Yes
SN74AHCT14DR	Texas Instruments	74AHCT	Active	4.5V ~ 5.5V	2 µA	8mA, 8mA	8ns	-40°C ~ 85°C	14-SOIC	Yes
SN74AHCT14MDREP	Texas Instruments	74AHCT	Active	4.5V ~ 5.5V	2 µA	8mA, 8mA	8ns	-55°C ~ 125°C	14-SOIC	Yes
SN74AHCT14NSR	Texas Instruments	74AHCT	Active	4.5V ~ 5.5V	2 µA	8mA, 8mA	8ns	-40°C ~ 85°C	14-SO	Yes
SN74AHCT14QDRG4Q1	Texas Instruments	74AHCT	Active	4.5V ~ 5.5V	2 µA	8mA, 8mA	8ns	-40°C ~ 125°C	14-SOIC	Yes
SN74AHCT14QDRQ1	Texas Instruments	74AHCT	Active	4.5V ~ 5.5V	2 µA	8mA, 8mA	8ns	-40°C ~ 125°C	14-SOIC	Yes

Engineering Selection Recommendations

For direct replacement of the obsolete 74VHCT14AM, the 74VHCT14D,118 from NXP USA Inc. is the primary equivalent, maintaining the same series designation and electrical characteristics while offering active product status and extended operating temperature range to 125°C.

When 74VHCT series parts are unavailable, the 74AHCT series from Texas Instruments provides compatible substitution. The SN74AHCT14DR and SN74AHCT14QDRG4Q1 are recommended for standard applications, both offering active status and RoHS3 compliance. The SN74AHCT14QDRG4Q1 and SN74AHCT14QDRQ1 variants include AEC-Q100 automotive qualification and extended temperature range (-40°C to 125°C), suitable for automotive and industrial applications.

All substitute parts maintain electrical equivalence in supply voltage, quiescent current, output current, and input logic levels. Propagation delay performance of substitute parts (8ns) exceeds the original specification (9.6ns), providing improved timing margins.

Frequently Asked Questions (FAQ)

Q: Can the 74AHCT14 series directly replace the 74VHCT14AM?

A: Yes. Both series meet the core electrical requirements: 4.5V to 5.5V supply voltage, 2 µA quiescent current, 8mA output current, and identical input logic levels. The 74AHCT series offers faster propagation delay (8ns vs. 9.6ns), which is compatible with the original design.

Q: What is the difference between 14-SOIC and 14-SO packages?

A: Both are 14-pin surface mount packages with the same pin count and pitch. The primary difference is body width: 14-SOIC is 3.90mm wide (0.154"), while 14-SO can vary. Verify PCB footprint compatibility before selection.

Q: Are the automotive-qualified variants (SN74AHCT14QDRG4Q1, SN74AHCT14QDRQ1) necessary for non-automotive applications?

A: No. Automotive qualification (AEC-Q100) is not required for standard industrial or consumer applications. Standard variants such as SN74AHCT14DR provide equivalent electrical performance at potentially lower cost.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not affect electrical substitution compatibility. The 74VHCT14AM operates to 85°C; substitute parts with extended ranges (to 125°C) are fully compatible and provide additional margin for high-temperature environments.

Q: Are all listed substitutes RoHS3 compliant?

A: The 74VHCT14D,118 from NXP USA Inc. and all Texas Instruments 74AHCT variants listed are RoHS3 compliant. NXP Semiconductors variants (74AHCT14D,112 and 74AHCT14D,118) do not specify RoHS status in available data; verify compliance with the supplier before procurement.

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