74LCX04SJ Equivalent & Substitute Parts

Part Overview

The 74LCX04SJ is a 6-channel inverter logic IC manufactured by onsemi in a 14-SOP package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The 74LCX04SJ operates across a 2V to 3.6V supply voltage range and is designed for low-power logic inversion applications requiring minimal quiescent current and fast propagation delays.

Key Parameters

Parameter	74LCX04SJ
Manufacturer	onsemi
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 @ 3.3V, 50pF	5.2ns
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)

Substitute Part Grouping Explanation

Substitution for the 74LCX04SJ is determined by the following critical parameters:

Functional Equivalence: All substitute parts must be 6-channel inverter logic ICs with 1 input per channel, maintaining identical logic functionality.

Electrical Compatibility: Supply voltage range, quiescent current, output drive current, input logic levels, and propagation delay are the primary electrical criteria. Substitutes must operate within overlapping or compatible voltage ranges and maintain similar switching characteristics.

Package Compatibility: The 14-SOIC package form factor is essential for PCB layout compatibility. Substitutes are grouped by package type: 14-SOIC (0.154", 3.90mm Width) and 14-SOIC (0.209", 5.30mm Width).

Product Status and Compliance: Active product status substitutes are preferred over obsolete parts. RoHS3 compliance and automotive-grade qualifications (AEC-Q100) are noted where applicable.

Packaging Format: Substitutes are available in multiple packaging formats (Bulk, Tube, Cut Tape & Digi-Reel, Tape & Reel) to accommodate different procurement and assembly requirements.

Parameter Comparison

Part Number	Manufacturer	Series	Voltage - Supply	Current - Quiescent (Max)	Current - Output High, Low	Max Propagation Delay @ 3.3V, 50pF	Operating Temperature	Package / Case	Product Status	RoHS Status
74LCX04SJ	onsemi	74LCX	2V ~ 3.6V	10 µA	24mA, 24mA	5.2ns	-40°C ~ 85°C	14-SOIC (0.209", 5.30mm Width)	Obsolete	Not Specified
74LVC04AD	NXP Semiconductors	74LVC	1.65V ~ 3.6V	1 µA	24mA, 24mA	4.3ns	-40°C ~ 125°C	Not Specified	Not Specified
SN74LVC04AD	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	24mA, 24mA	4.3ns	-40°C ~ 125°C	14-SOIC (0.154", 3.90mm Width)	Active	ROHS3 Compliant
SN74LVC04ADR	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	24mA, 24mA	4.3ns	-40°C ~ 125°C	14-SOIC (0.154", 3.90mm Width)	Active	ROHS3 Compliant
SN74LVC04ADT	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	24mA, 24mA	4.3ns	-40°C ~ 125°C	14-SOIC (0.154", 3.90mm Width)	Active	ROHS3 Compliant
SN74LVC04ANS	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	24mA, 24mA	4.3ns	-40°C ~ 125°C	14-SOIC (0.209", 5.30mm Width)	Active	ROHS3 Compliant
SN74LVC04ANSR	Texas Instruments	74LVC	1.65V ~ 3.6V	1 µA	24mA, 24mA	4.3ns	-40°C ~ 125°C	14-SOIC (0.209", 5.30mm Width)	Active	ROHS3 Compliant
SN74LVC04AQDREP	Texas Instruments	74LVC	2V ~ 3.6V	10 µA	24mA, 24mA	4.5ns	-40°C ~ 125°C	14-SOIC (0.154", 3.90mm Width)	Active	ROHS3 Compliant
SN74LVC04AQDRQ1	Texas Instruments	74LVC	2V ~ 3.6V	10 µA	24mA, 24mA	4.5ns	-40°C ~ 125°C	14-SOIC (0.154", 3.90mm Width)	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Package Replacement (14-SOIC 0.209" Width): SN74LVC04ANS and SN74LVC04ANSR are active products from Texas Instruments with identical package dimensions to the 74LCX04SJ. Both are RoHS3 compliant and offer extended operating temperature range (-40°C to 125°C). These parts are recommended for PCB layouts designed for the original 14-SOIC (0.209", 5.30mm Width) package.

For Electrical Parameter Matching: SN74LVC04AQDREP and SN74LVC04AQDRQ1 maintain the same supply voltage range (2V ~ 3.6V) and quiescent current specification (10 µA) as the 74LCX04SJ, ensuring compatibility with designs optimized for these parameters. SN74LVC04AQDRQ1 includes automotive-grade qualification (AEC-Q100), suitable for automotive applications.

For General-Purpose Substitution: SN74LVC04AD, SN74LVC04ADR, and SN74LVC04ADT offer improved electrical performance with lower quiescent current (1 µA), faster propagation delay (4.3ns), and extended temperature range (-40°C to 125°C). These parts use a smaller 14-SOIC (0.154", 3.90mm Width) package, requiring PCB layout modification.

For Procurement Flexibility: Multiple packaging formats are available across the substitute parts. SN74LVC04ADR (Cut Tape & Digi-Reel) and SN74LVC04ADT (Tape & Reel) offer high inventory availability (171,999 and 2,634 units respectively), supporting volume production requirements.

Frequently Asked Questions (FAQ)

Q: Can I use SN74LVC04AD as a direct replacement for 74LCX04SJ without PCB modification?

A: SN74LVC04AD uses a smaller 14-SOIC (0.154", 3.90mm Width) package compared to the 74LCX04SJ's 14-SOIC (0.209", 5.30mm Width). PCB layout modification is required. For direct package compatibility, use SN74LVC04ANS or SN74LVC04ANSR instead.

Q: What is the difference between SN74LVC04ANS and SN74LVC04ANSR?

A: Both parts are electrically identical 6-channel inverter ICs in the 14-SOIC (0.209", 5.30mm Width) package. The difference is packaging format: SN74LVC04ANS is supplied in Tube packaging, while SN74LVC04ANSR is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements.

Q: Why does SN74LVC04AQDRQ1 have "Q1" in its part number?

A: The "Q1" designation indicates automotive-grade qualification to AEC-Q100 standard. This part is suitable for automotive applications requiring enhanced reliability and qualification testing.

Q: Is the 74LCX04SJ still available for new designs?

A: The 74LCX04SJ is classified as obsolete. Active substitute parts from Texas Instruments (74LVC series) are recommended for new designs to ensure long-term availability and support.

Q: What are the key electrical differences between 74LCX04SJ and the 74LVC substitutes?

A: The primary differences are quiescent current (74LCX04SJ: 10 µA maximum vs. most 74LVC variants: 1 µA maximum) and propagation delay (74LCX04SJ: 5.2ns vs. 74LVC variants: 4.3ns to 4.5ns). The 74LVC series offers improved power efficiency and faster switching. Supply voltage ranges overlap (2V ~ 3.6V for 74LCX04SJ; 1.65V ~ 3.6V for most 74LVC variants), ensuring compatibility in most applications.

Q: Can I use parts with different operating temperature ranges interchangeably?

A: Operating temperature range substitution depends on application requirements. The 74LCX04SJ operates to 85°C maximum, while most 74LVC substitutes operate to 125°C. Parts with extended temperature range are suitable for applications requiring higher temperature operation. For applications limited to 85°C, both original and substitute specifications are acceptable.

Q: What does RoHS3 compliance mean for component selection?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. All active Texas Instruments substitutes listed are RoHS3 compliant, meeting modern environmental and regulatory standards for electronics manufacturing.

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