74F38SCX NAND Gate IC Equivalent & Substitute Parts

Part Overview

The 74F38SCX is a 4-channel 2-input NAND gate IC manufactured by onsemi in a 14-SOIC surface mount package with open collector output configuration. This logic component operates within the 4.5V to 5.5V supply voltage range and is classified as obsolete. Due to its obsolete status, identifying functionally equivalent substitute parts is essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Logic Type	NAND Gate
Number of Circuits	4
Number of Inputs	2
Features	Open Collector
Voltage - Supply	4.5V ~ 5.5V
Current - Output High, Low	-, 64mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	12.5ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Series	74F

Substitute Part Grouping Explanation

Substitute parts for the 74F38SCX are classified based on strict electrical and mechanical compatibility criteria:

Direct Substitutes (Identical Electrical and Mechanical Parameters):

SN74F38D (Texas Instruments)
SN74F38DR (Texas Instruments)

These parts maintain all critical electrical specifications: 4-channel 2-input NAND gate configuration, open collector output, 4.5V to 5.5V supply voltage, 64mA output current, 12.5ns propagation delay, and 0°C to 70°C operating temperature range. Both are packaged in 14-SOIC surface mount format with 0.154" (3.90mm) width.

Similar Substitute (Package Variant):

SN74F38NSR (Texas Instruments)

This part maintains all electrical specifications identical to direct substitutes but differs in package dimensions: 14-SO with 0.209" (5.30mm) width versus the standard 14-SOIC (0.154", 3.90mm width). This dimensional difference may affect PCB layout compatibility.

Parameter Comparison

Parameter	74F38SCX (onsemi)	SN74F38D (TI)	SN74F38DR (TI)	SN74F38NSR (TI)
Logic Type	NAND Gate	NAND Gate	NAND Gate	NAND Gate
Number of Circuits	4	4	4	4
Number of Inputs	2	2	2	2
Features	Open Collector	Open Collector	Open Collector	Open Collector
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Output High, Low	-, 64mA	-, 64mA	-, 64mA	-, 64mA
Input Logic Level - Low	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V	2V
Max Propagation Delay @ V, Max CL	12.5ns @ 5V, 50pF	12.5ns @ 5V, 50pF	12.5ns @ 5V, 50pF	12.5ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SO (0.209", 5.30mm)
Product Status	Obsolete	Last Time Buy	Active	Active
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Selection: SN74F38DR

The SN74F38DR is the recommended substitute for the obsolete 74F38SCX. This Texas Instruments part maintains active product status, ensuring long-term availability and supply chain stability. It carries ROHS3 compliance certification and matches all electrical and mechanical specifications of the original component, including the standard 14-SOIC (0.154", 3.90mm) package format. No PCB layout modifications are required for direct substitution.

Secondary Selection: SN74F38D

The SN74F38D provides functional equivalence with identical electrical specifications and package dimensions. However, its Last Time Buy status indicates limited future availability. This part is suitable for applications where immediate procurement is possible but should not be selected for new designs requiring long-term component sourcing.

Alternative Selection: SN74F38NSR

The SN74F38NSR maintains all electrical specifications but features a wider 14-SO package (0.209", 5.30mm width) compared to the standard 14-SOIC format. This dimensional difference requires PCB layout verification to confirm footprint compatibility. Selection of this part is appropriate only when PCB layout accommodates the wider package or when other substitutes are unavailable.

Frequently Asked Questions (FAQ)

Q: Can SN74F38D, SN74F38DR, and SN74F38NSR be used interchangeably with 74F38SCX?

A: SN74F38D and SN74F38DR are direct electrical and mechanical equivalents requiring no design modifications. SN74F38NSR is electrically equivalent but has different package dimensions (0.209" width versus 0.154"), requiring PCB footprint verification before substitution.

Q: What is the difference between 14-SOIC and 14-SO packages?

A: Both are 14-pin surface mount packages, but 14-SOIC (0.154", 3.90mm width) is narrower than 14-SO (0.209", 5.30mm width). PCB footprints designed for 14-SOIC may not accommodate the wider 14-SO package without layout modifications.

Q: Why is the 74F38SCX obsolete?

A: The 74F38SCX is classified as obsolete by onsemi. Texas Instruments continues to manufacture functionally equivalent parts under the SN74F38 series, providing continuity for applications requiring 4-channel 2-input NAND gate ICs with open collector output.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SN74F38D, SN74F38DR, and SN74F38NSR all carry ROHS3 compliance certification. The original 74F38SCX is listed as REACH Unaffected.

Q: What is the recommended substitute for new designs?

A: SN74F38DR is recommended for new designs due to its active product status, ensuring availability throughout the design lifecycle and production phases.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message