74LVC38ADB,112 Equivalent & Substitute Parts

Part Overview

The 74LVC38ADB,112 is a NAND Gate IC featuring 4 channels with 2 inputs per channel and open drain output configuration in a 14-SSOP surface mount package. Manufactured by NXP USA Inc., this component operates across a wide supply voltage range of 1.2V to 5.5V and is designed for logic-level signal processing applications. The product is currently classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

74LVC38ADB,112

NXP USA Inc.In Stock: 98674LVC38ADB,112 Datasheet

Current PartRFQ

74LCX38MTC

Fairchild SemiconductorIn Stock: 182974LCX38MTC Datasheet

MFR RecommendedRFQ

74LCX38MTCX

Fairchild SemiconductorIn Stock: 473374LCX38MTCX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74LVC38ADB,112 are identified based on the following critical parameters that determine functional equivalence:

• Logic function: NAND Gate with identical circuit count (4 channels) and input configuration (2 inputs per channel)
• Output configuration: Open drain topology
• Input logic levels: 0.7V ~ 0.8V (low) and 1.7V ~ 2V (high)
• Mounting type: Surface mount technology
• Supply voltage compatibility: Substitutes must operate within overlapping voltage ranges with the main part

The identified substitutes are from the 74LCX series manufactured by Fairchild Semiconductor. These parts maintain the core NAND gate functionality and open drain output characteristics. While the 74LCX38 series operates within a narrower supply voltage range (2V ~ 3.6V) compared to the 74LVC38 (1.2V ~ 5.5V), this represents a subset of the original operating range and is suitable for applications operating at standard logic voltage levels.

Parameter Comparison

Engineering Selection Recommendations

The 74LVC38ADB,112 is obsolete, necessitating substitute part selection for ongoing production and support. Both identified substitutes from Fairchild Semiconductor (74LCX38MTC and 74LCX38MTCX) are active products with current availability.

The 74LCX38MTCX is the preferred substitute when package compatibility is a design consideration. It maintains the same logic function, input/output characteristics, and open drain configuration. The 14-TSSOP package (0.173", 4.40mm width) is physically smaller than the original 14-SSOP package (0.209", 5.30mm width), which may require PCB layout verification for existing designs.

The 74LCX38MTC provides an alternative substitute with identical functional characteristics. Package specifications for this variant are not detailed in available data.

Both substitutes operate within a narrower supply voltage range (2V ~ 3.6V) compared to the original part (1.2V ~ 5.5V). Applications requiring operation below 2V or above 3.6V cannot use these substitutes. Additionally, both substitutes have a reduced maximum operating temperature of 85°C versus the original 125°C, and slightly lower output current capability (24mA versus 32mA).

Both substitutes demonstrate improved quiescent current performance (10 µA versus 40 µA), representing a design advantage for power-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the 74LCX38MTCX directly replace the 74LVC38ADB,112 in existing designs?

A: Functional replacement is possible for applications operating within the 2V to 3.6V supply voltage range and maximum temperature of 85°C. PCB layout verification is required due to package size differences (14-TSSOP versus 14-SSOP). Pin configuration and logic function are equivalent.

Q: What are the key differences between the 74LVC38 and 74LCX38 series?

A: The primary differences are supply voltage range (74LVC38: 1.2V ~ 5.5V; 74LCX38: 2V ~ 3.6V), maximum operating temperature (74LVC38: 125°C; 74LCX38: 85°C), quiescent current (74LVC38: 40 µA; 74LCX38: 10 µA), and propagation delay (74LVC38: 2.3ns; 74LCX38: 5ns). Logic function and input/output characteristics remain identical.

Q: Is the 74LCX38MTC suitable for applications requiring the original 14-SSOP package?

A: The 74LCX38MTC package specifications are not detailed in available documentation. Contact the manufacturer or authorized distributor for package confirmation before design implementation.

Q: What is the impact of the reduced output current (24mA versus 32mA) on system design?

A: Applications requiring output currents exceeding 24mA cannot use the 74LCX38 substitutes. Verify load requirements and pull-up resistor values in existing designs to ensure compatibility.

Q: Are both substitutes RoHS compliant?

A: RoHS compliance status for the 74LCX38 series is not specified in available data. Verify compliance requirements with the manufacturer or authorized distributor for your specific application.