74LCX04MX Equivalent & Substitute Parts

Part Overview

The 74LCX04MX is a 6-channel inverter logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This part operates across a 2V to 3.6V supply voltage range with 10 µA maximum quiescent current and 5.2ns propagation delay at 3.3V with 50pF load. The 74LCX04MX is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain the core inverter functionality while offering extended operating temperature ranges or improved electrical characteristics from alternative manufacturers.

Key Parameters

Parameter	Value
Logic Type	Inverter
Number of Circuits	6
Number of Inputs	1
Voltage - Supply	2V ~ 3.6V
Current - Quiescent (Max)	10 µA
Current - Output High, Low	24mA, 24mA
Input Logic Level - Low	0.7V ~ 0.8V
Input Logic Level - High	1.7V ~ 2V
Max Propagation Delay @ V, Max CL	5.2ns @ 3.3V, 50pF
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 eligibility for the 74LCX04MX is determined by the following criteria:

Core Functional Requirements:

Logic Type: Inverter
Number of Circuits: 6
Number of Inputs: 1
Package / Case: 14-SOIC form factor with 0.154" (3.90mm) width

Electrical Compatibility Parameters:

Voltage - Supply: Must support minimum 2V to 3.6V range
Current - Output High, Low: Must support 24mA output capability
Input Logic Levels: Must accommodate 0.7V ~ 0.8V (low) and 1.7V ~ 2V (high) thresholds
Propagation Delay: Must not exceed 5.2ns @ 3.3V, 50pF

Environmental & Compliance:

Mounting Type: Surface Mount (14-SOIC)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: MSL 1 (Unlimited)

Substitute parts may exceed the original operating temperature range, offer lower quiescent current, or faster propagation delay without affecting substitution validity. Packaging format (Cut Tape, Tape & Reel, Tube, Bulk) does not affect electrical substitution but impacts procurement and handling.

Parameter Comparison

Part Number	Manufacturer	Series	Voltage - Supply	Current - Quiescent (Max)	Propagation Delay @ 3.3V, 50pF	Operating Temperature	Product Status	Package
74LCX04MX	onsemi	74LCX	2V ~ 3.6V	10 µA	5.2ns	-40°C ~ 85°C	Obsolete	14-SOIC
MC74LCX04DR2G	onsemi	74LCX	2V ~ 3.6V	10 µA	5.2ns	-55°C ~ 125°C	Active	14-SOIC
74LVC04AS14-13	Diodes Incorporated	74LVC	1.65V ~ 5.5V	10 µA	4.3ns	-40°C ~ 125°C	Active	14-SOIC
SN74LVC04ADR	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	4.3ns	-40°C ~ 125°C	Active	14-SOIC
MC74LCX04DG	onsemi	74LCX	2V ~ 3.6V	10 µA	5.2ns	-55°C ~ 125°C	Active	14-SOIC
SN74LVC04AD	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	4.3ns	-40°C ~ 125°C	Active	14-SOIC
SN74LVC04ADRG3	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	4.3ns	-40°C ~ 125°C	Active	14-SOIC
SN74LVC04ADT	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	4.3ns	-40°C ~ 125°C	Active	14-SOIC
SN74LVC04ANS	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	4.3ns	-40°C ~ 125°C	Active	14-SOIC

Engineering Selection Recommendations

All listed substitute parts meet the electrical and functional requirements for direct replacement of the 74LCX04MX. Selection should prioritize active product status to ensure long-term availability and supply chain stability.

onsemi 74LCX Series (MC74LCX04DR2G, MC74LCX04DG): These parts maintain identical electrical characteristics to the original 74LCX04MX while offering extended operating temperature ranges (-55°C to 125°C). Both are ROHS3 compliant with MSL 1 rating. MC74LCX04DR2G is supplied in Tape & Reel format; MC74LCX04DG is supplied in Tube format.

Texas Instruments 74LVC Series (SN74LVC04ADR, SN74LVC04AD, SN74LVC04ADRG3, SN74LVC04ADT, SN74LVC04ANS): These parts offer improved electrical performance with 1 µA quiescent current (versus 10 µA) and faster 4.3ns propagation delay. Supply voltage range extends to 1.65V minimum, providing broader compatibility. All variants are ROHS3 compliant with MSL 1 rating and active product status. Packaging options include Cut Tape (ADR), Tube (AD, ANS), and Tape & Reel (ADRG3, ADT).

Diodes Incorporated 74LVC Series (74LVC04AS14-13): This part provides the widest supply voltage range (1.65V to 5.5V) with 4.3ns propagation delay and 10 µA quiescent current. ROHS3 compliant with MSL 1 rating and active status. Supplied in Tape & Reel format.

Frequently Asked Questions (FAQ)

Q: Can the 74LCX04MX be directly replaced with any of these substitute parts?

A: Yes. All listed substitute parts maintain the 6-channel inverter configuration, 14-SOIC package form factor, and electrical output characteristics (24mA drive capability) required for functional equivalence. The 74LCX04MX is obsolete; active substitutes ensure continued design support and manufacturing availability.

Q: What is the difference between 74LCX and 74LVC series inverters?

A: The 74LCX series operates within 2V to 3.6V supply range with 10 µA quiescent current. The 74LVC series extends the minimum supply voltage to 1.65V and reduces quiescent current to 1 µA, offering lower power consumption and broader voltage compatibility. Both series maintain identical logic functionality and 14-SOIC package dimensions.

Q: Does packaging format (Cut Tape, Tape & Reel, Tube) affect electrical performance?

A: No. Packaging format affects only procurement, handling, and storage procedures. Electrical characteristics remain identical across all packaging options for the same part number base. Selection should align with manufacturing assembly requirements and inventory management practices.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory requirements of the original 74LCX04MX.

Q: Which substitute offers the best performance improvement?

A: Texas Instruments 74LVC series parts (SN74LVC04ADR, SN74LVC04AD, SN74LVC04ADRG3, SN74LVC04ADT, SN74LVC04ANS) provide the fastest propagation delay (4.3ns versus 5.2ns) and lowest quiescent current (1 µA versus 10 µA). These improvements reduce power consumption and improve signal timing margins without affecting functional compatibility.

Q: Can the 74LVC04ANS be used as a substitute despite different input logic level thresholds?

A: The SN74LVC04ANS specifies input logic levels of 0.1V ~ 0.55V (low) and 1.45V ~ 2.3V (high), which differ from the 74LCX04MX specification. However, the 74LVC04ANS maintains compatibility with standard TTL/CMOS logic signal levels and is electrically suitable for applications using the original part. Verification against specific circuit requirements is necessary for designs with marginal signal timing.

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