74VCX00BQX Equivalent & Substitute Parts

Part Overview

The 74VCX00BQX is a NAND Gate IC featuring 4 channels with 2 inputs per channel, manufactured by onsemi in a 14-DQFN (3x2.5) surface mount package. This logic component operates across a supply voltage range of 1.2V to 3.6V with a maximum propagation delay of 2.8ns at 3.3V with 30pF load. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Logic Type	NAND Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	1.2V ~ 3.6V
Current - Quiescent (Max)	20 µA
Current - Output High, Low	24mA, 24mA
Max Propagation Delay @ 3.3V, 30pF	2.8ns
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 74VCX00BQX are qualified based on the following critical parameters:

Logic function: NAND Gate with 4 channels and 2 inputs per channel
Supply voltage compatibility: 1.2V ~ 3.6V range
Output drive capability: 24mA minimum for both high and low states
Quiescent current: 20 µA maximum
Operating temperature range: -40°C ~ 85°C
Surface mount packaging with equivalent pin configuration

The two identified substitutes maintain functional equivalence through matching logic topology, electrical performance characteristics, and thermal operating range. Package form factors differ but remain compatible for PCB integration with appropriate footprint adaptation.

Parameter Comparison

Parameter	74VCX00BQX (onsemi)	74VCX00MTCX (Fairchild)	74ALVC00BQ,115 (NXP)
Logic Type	NAND Gate	NAND Gate	NAND Gate
Number of Circuits	4	4	4
Number of Inputs	2	2	2
Voltage - Supply	1.2V ~ 3.6V	1.2V ~ 3.6V	1.65V ~ 3.6V
Current - Quiescent (Max)	20 µA	20 µA	20 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA
Input Logic Level - Low	0.7V ~ 0.8V	0.7V ~ 0.8V	0.7V ~ 0.8V
Input Logic Level - High	1.6V ~ 2V	1.6V ~ 2V	1.7V ~ 2V
Max Propagation Delay @ 3.3V	2.8ns @ 30pF	2.8ns @ 30pF	2.1ns @ 50pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-VFQFN Exposed Pad	14-TSSOP (0.173", 4.40mm Width)	14-VFQFN Exposed Pad
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

The 74VCX00MTCX (Fairchild Semiconductor) provides direct functional substitution with identical electrical specifications and matching propagation delay characteristics. This part maintains active product status and is available in higher inventory quantities (8064 pcs), supporting production continuity. The 14-TSSOP package requires PCB footprint modification from the original 14-DQFN format.

The 74ALVC00BQ,115 (NXP USA Inc.) offers superior propagation delay performance (2.1ns versus 2.8ns at 3.3V) with expanded load capacitance tolerance (50pF versus 30pF). This part operates within a minimum supply voltage of 1.65V, which is compatible with the original 1.2V specification for applications operating above 1.65V. Active product status and RoHS3 compliance ensure long-term availability. The 14-DHVQFN package maintains dimensional similarity to the original 14-VFQFN format.

Both substitutes carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, ensuring regulatory equivalence for export and tariff purposes.

Frequently Asked Questions (FAQ)

Q: Can the 74VCX00MTCX directly replace the 74VCX00BQX without circuit modification?

A: Functional replacement is possible with PCB footprint adaptation. The 14-TSSOP package differs from the original 14-DQFN, requiring new PCB layout. Electrical performance and pin configuration remain compatible.

Q: What is the minimum supply voltage requirement when using the 74ALVC00BQ,115 substitute?

A: The 74ALVC00BQ,115 operates from 1.65V minimum, compared to the original 1.2V specification. Applications requiring operation below 1.65V must use the 74VCX00MTCX or source the original 74VCX00BQX.

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

A: Both substitutes maintain RoHS3 compliance and identical ECCN/HTSUS classifications. No compliance barriers exist for substitution in regulated applications.

Q: Which substitute offers the best performance improvement?

A: The 74ALVC00BQ,115 provides faster propagation delay (2.1ns versus 2.8ns) and higher load capacitance tolerance (50pF versus 30pF), delivering improved timing margins in high-speed applications.

Q: What inventory considerations apply to these substitutes?

A: The 74VCX00MTCX offers the highest available inventory (8064 pcs), followed by the 74ALVC00BQ,115 (3251 pcs). The original 74VCX00BQX remains available (876 pcs) but is classified as obsolete.

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