74LCX38MX NAND Gate IC Equivalent & Substitute Parts

Part Overview

The 74LCX38MX is a 4-channel, 2-input NAND gate logic IC manufactured by onsemi in a 14-SOIC surface mount package. This component features open drain output configuration and operates across a 2V to 3.6V supply voltage range, making it suitable for low-voltage digital logic applications. The product is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional and electrical compatibility for ongoing design requirements and production needs.

Substiute Parts

74LCX38MX

onsemiIn Stock: 190974LCX38MX Datasheet

Current PartRFQ

MC74LCX00DR2G

onsemiIn Stock: 3450MC74LCX00DR2G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74LCX38MX is determined by strict alignment of the following critical parameters:

• Logic function: 4-channel, 2-input NAND gate configuration
• Supply voltage range: 2V ~ 3.6V compatibility
• Package type: 14-SOIC surface mount form factor
• Input/output electrical characteristics: Logic level thresholds and propagation delay specifications
• Operating temperature range: -40°C ~ 85°C
• Compliance certifications: ROHS3 compliance and REACH status

The MC74LCX00DR2G qualifies as a direct substitute based on matching logic configuration, voltage specifications, package geometry, and thermal operating range. The primary distinction is the transition from obsolete to active product status, with minor variations in output drive capability and propagation delay within acceptable engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

The MC74LCX00DR2G is the qualified substitute for the obsolete 74LCX38MX based on the following engineering criteria:

Product Status & Availability: The MC74LCX00DR2G maintains active product status with confirmed inventory availability (3365 pcs), ensuring long-term supply chain continuity compared to the obsolete 74LCX38MX.

Compliance & Certification: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for current manufacturing and deployment environments.

Electrical Compatibility: Identical supply voltage range (2V ~ 3.6V), matching input logic level thresholds, and equivalent quiescent current specifications ensure direct functional replacement without circuit redesign.

Package & Thermal Specifications: Identical 14-SOIC package geometry and -40°C ~ 85°C operating temperature range provide mechanical and thermal interchangeability.

Performance Tolerance: The 0.5ns propagation delay differential (5ns vs 5.5ns @ 3.3V, 50pF) falls within acceptable engineering margins for standard logic applications and does not necessitate timing circuit modifications.

Frequently Asked Questions (FAQ)

Q: Can MC74LCX00DR2G be used as a direct replacement for 74LCX38MX without PCB modifications?

A: Yes. Both parts share identical 14-SOIC package geometry, pin configuration, and electrical operating parameters. No PCB layout changes are required for substitution.

Q: What is the significance of the open drain feature on the 74LCX38MX?

A: The 74LCX38MX features open drain output configuration, which differs from the standard CMOS output of the MC74LCX00DR2G. This distinction affects output drive capability and pull-up resistor requirements in the circuit design. Verify that your application circuit accommodates the MC74LCX00DR2G's standard output configuration.

Q: Are there differences in output drive capability between these parts?

A: The 74LCX38MX specifies output low current only (24mA), while the MC74LCX00DR2G specifies symmetrical output capability (24mA high and low). This represents an improvement in output drive symmetry for the substitute part.

Q: Does the 0.5ns propagation delay difference impact circuit timing?

A: For standard logic applications operating at typical clock frequencies, the 0.5ns difference is negligible. High-speed or timing-critical designs should verify that the 5.5ns maximum delay remains within system timing budgets.

Q: What packaging format is the MC74LCX00DR2G supplied in?

A: The MC74LCX00DR2G is supplied in Tape & Reel (TR) format, suitable for automated assembly processes. Confirm compatibility with your procurement and assembly specifications.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both parts operate across -40°C ~ 85°C, ensuring compatibility for industrial and commercial temperature environments.