DM74ALS38AMX Equivalent & Substitute Parts

Part Overview

The DM74ALS38AMX is a NAND Gate IC featuring 4 channels with 2 inputs per channel and open collector output configuration in a 14-SOIC package. Manufactured by onsemi, this component operates within the 74ALS logic family and is classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, production support, and system maintenance. Direct substitutes from active manufacturers ensure ongoing availability and supply chain reliability.

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 Low	24mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay	33ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC
Series	74ALS

Substitute Part Grouping Explanation

Substitution for the DM74ALS38AMX is determined by strict equivalence across the following critical parameters:

Logic Type: NAND Gate (4 channels, 2 inputs)
Features: Open Collector output configuration
Voltage Supply Range: 4.5V ~ 5.5V
Output Current Capability: 24mA low
Input Logic Levels: 0.8V (low), 2V (high)
Propagation Delay: 33ns @ 5V, 50pF
Operating Temperature Range: 0°C ~ 70°C
Mounting Type: Surface Mount
Series Classification: 74ALS

Substitute parts are categorized into two groups:

Direct Substitutes maintain identical electrical specifications and package dimensions (14-SOIC, 0.154" width), enabling pin-for-pin replacement.

Similar Substitutes maintain all electrical specifications but differ in package physical dimensions (14-SO, 0.209" width), requiring PCB layout verification before implementation.

Parameter Comparison

Parameter	DM74ALS38AMX (onsemi)	SN74ALS38BD (TI)	SN74ALS38BDR (TI)	SN74ALS38BNSR (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 Low	24mA	24mA	24mA	24mA
Input Logic Level - Low	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V	2V
Max Propagation Delay	33ns @ 5V, 50pF	33ns @ 5V, 50pF	33ns @ 5V, 50pF	33ns @ 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
Supplier Device Package	14-SOIC	14-SOIC	14-SOIC	14-SO
Package / Case	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.209", 5.30mm)
Product Status	Obsolete	Last Time Buy	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SN74ALS38BDR (Texas Instruments) is the primary substitute for the DM74ALS38AMX. This part maintains complete electrical and mechanical equivalence with identical 14-SOIC package dimensions (0.154" width). The SN74ALS38BDR carries Active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment for new designs and production support.

SN74ALS38BD (Texas Instruments) provides direct electrical equivalence with identical package dimensions. This part is classified as Last Time Buy, indicating limited future availability. Selection of this part should be reserved for legacy system maintenance where supply from active alternatives is constrained.

SN74ALS38BNSR (Texas Instruments) maintains complete electrical equivalence but differs in package physical dimensions (14-SO, 0.209" width versus 0.154" width). This part is supplied in Tape & Reel packaging and carries Active status with ROHS3 compliance. Implementation requires PCB layout verification to confirm mechanical compatibility with existing footprints designed for the narrower 0.154" package width.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS38BDR be used as a direct replacement for DM74ALS38AMX?

A: Yes. The SN74ALS38BDR is electrically and mechanically equivalent. All electrical parameters, logic specifications, and package dimensions are identical, enabling direct pin-for-pin substitution without circuit modification.

Q: What is the difference between SN74ALS38BD and SN74ALS38BDR?

A: Both parts are electrically identical with the same 14-SOIC package dimensions. The primary difference is product status: SN74ALS38BD is Last Time Buy, while SN74ALS38BDR is Active. For new designs and ongoing production, SN74ALS38BDR is preferred due to continued availability.

Q: Can SN74ALS38BNSR replace DM74ALS38AMX on existing PCBs?

A: Electrical substitution is valid; however, mechanical compatibility must be verified. The SN74ALS38BNSR uses a 14-SO package with 0.209" width, compared to the 0.154" width of the original 14-SOIC package. PCB footprint compatibility must be confirmed before implementation. If the existing footprint is designed for the narrower package, physical fit issues may occur.

Q: Are all substitute parts RoHS compliant?

A: Yes. All Texas Instruments substitutes (SN74ALS38BD, SN74ALS38BDR, SN74ALS38BNSR) are ROHS3 compliant. The original onsemi part (DM74ALS38AMX) RoHS status is not specified in the provided data.

Q: What is the supply voltage tolerance for these parts?

A: All parts operate within 4.5V to 5.5V supply voltage range. This specification is identical across the main part and all substitutes.

Q: Do these parts have moisture sensitivity requirements?

A: All parts carry Moisture Sensitivity Level (MSL) 1, indicating unlimited moisture sensitivity protection. Standard handling procedures for surface mount components apply.

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