74F38SC NAND Gate IC Equivalent & Substitute Parts

Part Overview

The 74F38SC is a 4-channel, 2-input NAND gate IC manufactured by onsemi in a 14-SOIC surface mount package. This logic component features open collector outputs and operates within the 4.5V to 5.5V supply voltage range. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Specification
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

Substitution eligibility for the 74F38SC is determined by strict equivalence across the following parameters: logic type (NAND Gate), circuit count (4 channels), input count (2 inputs per channel), output configuration (open collector), supply voltage range (4.5V ~ 5.5V), output current capability (64mA), input logic thresholds (0.8V low, 2V high), propagation delay (12.5ns @ 5V, 50pF), operating temperature range (0°C ~ 70°C), and surface mount packaging in the 14-SOIC form factor.

The identified substitutes are classified into three categories based on their relationship to the main part:

Direct Manufacturer Equivalent (SN74F38DR): Identical electrical and mechanical specifications with active product status and standard cut tape packaging.

Similar Manufacturer Part (SN74F38NSR): Meets all core electrical parameters with minor package width variation (5.30mm vs. 3.90mm) and tape & reel packaging format.

Parametric Equivalent (SN74F38D): Functionally equivalent across all critical parameters with tube packaging and last-time-buy status.

Parameter Comparison

Parameter	74F38SC (onsemi)	SN74F38DR (TI)	SN74F38NSR (TI)	SN74F38D (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 (0.209", 5.30mm)	14-SOIC (0.154", 3.90mm)
Product Status	Obsolete	Active	Active	Last Time Buy
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and ongoing system support, SN74F38DR is the primary substitute. This Texas Instruments part maintains identical electrical specifications and package dimensions while offering active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

SN74F38NSR provides functional equivalence with ROHS3 compliance and active status. The package width difference (5.30mm vs. 3.90mm) requires PCB layout verification to confirm mechanical compatibility in existing designs.

SN74F38D is suitable for applications where tube packaging is acceptable. Last-time-buy status indicates limited future availability; this option is appropriate only for legacy system maintenance with defined end-of-life timelines.

Frequently Asked Questions (FAQ)

Q: Can SN74F38DR be used as a direct replacement for 74F38SC?

A: Yes. SN74F38DR matches all electrical parameters, operating conditions, and package dimensions of the 74F38SC. No circuit modifications are required.

Q: What is the difference between SN74F38DR and SN74F38NSR?

A: Both parts are electrically identical. The primary difference is package width: SN74F38DR is 3.90mm wide (matching 74F38SC), while SN74F38NSR is 5.30mm wide. Packaging format also differs: SN74F38DR uses cut tape, while SN74F38NSR uses tape & reel. PCB layout compatibility must be confirmed before substitution.

Q: Is SN74F38D a viable long-term substitute?

A: SN74F38D is electrically equivalent but carries last-time-buy status, indicating limited future availability. It is suitable for legacy system repairs with defined end-of-life dates but not recommended for new designs requiring extended component availability.

Q: Are all substitutes ROHS3 compliant?

A: SN74F38DR, SN74F38NSR, and SN74F38D are all ROHS3 compliant. The original 74F38SC is REACH unaffected.

Q: Do the substitutes maintain the same open collector output characteristics?

A: Yes. All substitute parts maintain open collector output configuration with 64mA output current capability, identical to the 74F38SC.

Q: What packaging options are available for the 74F38 series?

A: SN74F38DR is supplied in cut tape format, SN74F38NSR in tape & reel format, and SN74F38D in tube packaging. Selection depends on production volume and handling requirements.

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