SN74LS38DRE4 Equivalent & Substitute Parts

Part Overview

The SN74LS38DRE4 is a NAND Gate IC with 4 channels and 2 inputs per channel, featuring open collector output configuration in a 14-SOIC surface mount package. Manufactured by Texas Instruments, this component is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Key Parameters

Parameter	Value
Logic Type	NAND Gate
Number of Circuits	4
Number of Inputs	2
Features	Open Collector
Voltage - Supply	4.75V ~ 5.25V
Current - Output Low	24mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay	32ns @ 5V, 45pF
Operating Temperature	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LS38DRE4 is determined by the following mandatory parameters:

Logic Type: NAND Gate
Number of Circuits: 4 channels
Number of Inputs: 2 inputs per channel
Features: Open Collector output
Supply Voltage Range: 4.75V ~ 5.25V
Package Type: 14-SOIC surface mount
Input Logic Levels: Low ≤ 0.8V, High ≥ 2V
Operating Temperature Range: 0°C ~ 70°C

All substitute parts listed below meet these core electrical and mechanical specifications. Variations in output current capacity and propagation delay characteristics are noted but do not preclude functional substitution within the defined parameter envelope.

Parameter Comparison

Parameter	SN74LS38DRE4	SN74LS26D	SN74LS38DR	SN74LS03D
Manufacturer	Texas Instruments	Motorola	Texas Instruments	Texas Instruments
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	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Current - Output Low	24mA	8mA	24mA	16mA
Input Logic Level - Low	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V	2V
Max Propagation Delay	32ns @ 5V, 45pF	32ns @ 5V, 15pF	32ns @ 5V, 45pF	32ns @ 5V, 15pF
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Discontinued	Obsolete	Active	Last Time Buy
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SN74LS38DR is the manufacturer-recommended substitute. This part maintains identical electrical specifications to the SN74LS38DRE4, including output current capacity (24mA) and propagation delay characteristics (32ns @ 5V, 45pF). The SN74LS38DR is currently in active production status and carries ROHS3 compliance certification, making it the preferred choice for new designs and ongoing procurement.

SN74LS03D is a functionally equivalent alternative with active Last Time Buy status and ROHS3 compliance. This part exhibits reduced output current capacity (16mA) and lower propagation delay load capacitance (15pF) compared to the primary part. Selection of this substitute requires confirmation that the reduced output current specification meets application requirements.

SN74LS26D is functionally equivalent but carries obsolete product status and RoHS non-compliance. This part exhibits reduced output current capacity (8mA) and lower propagation delay load capacitance (15pF). Use of this substitute is not recommended for new designs due to compliance and availability constraints.

Frequently Asked Questions (FAQ)

Q: Can SN74LS38DR be used as a direct replacement for SN74LS38DRE4?

A: Yes. The SN74LS38DR meets all core electrical and mechanical specifications of the SN74LS38DRE4, including logic type, circuit count, input configuration, open collector output, supply voltage range, input logic levels, propagation delay, operating temperature, and 14-SOIC package format. The primary difference is packaging format (Tape & Reel versus tube) and active product status.

Q: What is the significance of output current differences between substitute parts?

A: Output current capacity determines the maximum load current the open collector output can sink. The SN74LS38DRE4 and SN74LS38DR both support 24mA output current. The SN74LS03D supports 16mA, and the SN74LS26D supports 8mA. Application circuits must not exceed the specified output current limit of the selected part.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All listed substitute parts use the 14-SOIC surface mount package with identical pin configuration and physical dimensions (0.154" width, 3.90mm). PCB footprints designed for the SN74LS38DRE4 are compatible with all substitute parts listed.

Q: What is the difference between ROHS3 compliant and RoHS non-compliant parts?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements and does not contain restricted materials. RoHS non-compliant parts may contain restricted substances and are subject to regulatory restrictions in certain markets and applications.

Q: Why is SN74LS38DR recommended over SN74LS03D?

A: The SN74LS38DR maintains identical output current capacity (24mA) and propagation delay load capacitance (45pF) specifications as the original SN74LS38DRE4. The SN74LS03D exhibits reduced specifications in both parameters. Selection of SN74LS38DR eliminates the requirement to verify application compatibility with reduced electrical characteristics.

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