DM74ALS38AM NAND Gate IC Equivalent & Substitute Parts

Part Overview

The DM74ALS38AM is a 4-channel 2-input NAND gate IC with open collector output in 14-SOIC surface mount packaging, manufactured by onsemi. 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 and compatible substitute parts is essential for design continuity, procurement flexibility, and long-term system 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 High, Low	-, 24mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	33ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Series	74ALS

Substitute Part Grouping Explanation

Substitution for the DM74ALS38AM is determined by strict equivalence across the following parameters:

Logic Type: NAND Gate (4 channels, 2 inputs per channel)
Features: Open Collector output configuration
Voltage - Supply: 4.5V ~ 5.5V
Current - Output Low: 24mA
Input Logic Levels: Low 0.8V, High 2V
Max Propagation Delay: 33ns @ 5V, 50pF
Operating Temperature: 0°C ~ 70°C
Series: 74ALS

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Substitute (SN74ALS38BDR): Identical electrical and mechanical specifications with active product status from Texas Instruments.

Similar Manufacturer Substitute (SN74ALS38BNSR): Functionally equivalent with identical electrical parameters but different packaging format (Tape & Reel) and slightly different package dimensions (14-SO, 0.209" width vs. 0.154" width).

Parametric Equivalent Substitute (SN74ALS38BD): Identical electrical and mechanical specifications with Last Time Buy product status from Texas Instruments.

Parameter Comparison

Parameter	DM74ALS38AM	SN74ALS38BDR	SN74ALS38BNSR	SN74ALS38BD
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Last Time Buy
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 @ V, Max CL	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-SO	14-SOIC
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.209", 5.30mm Width)	14-SOIC (0.154", 3.90mm Width)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

SN74ALS38BDR is the primary substitute for the DM74ALS38AM. This part maintains identical electrical specifications, package dimensions, and mounting configuration while offering active product status from Texas Instruments. ROHS3 compliance provides regulatory advantage for new designs and long-term availability assurance.

SN74ALS38BD serves as an alternative substitute with identical specifications to SN74ALS38BDR but carries Last Time Buy status, indicating limited future availability. This part is suitable for applications requiring immediate procurement but should not be selected for designs with extended production lifecycles.

SN74ALS38BNSR is functionally equivalent but supplied in Tape & Reel packaging with a wider package body (0.209" vs. 0.154"). This part is appropriate only when tape and reel format is required for automated assembly processes and when PCB layout accommodates the wider package dimension.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS38BDR be used as a direct replacement for DM74ALS38AM without PCB modifications?

A: Yes. SN74ALS38BDR maintains identical package dimensions (14-SOIC, 0.154" width), pin configuration, and electrical specifications. No PCB layout changes are required.

Q: What is the difference between SN74ALS38BDR and SN74ALS38BNSR?

A: Both parts are functionally equivalent with identical electrical performance. The primary difference is packaging format: SN74ALS38BDR is supplied in tube packaging, while SN74ALS38BNSR is supplied in Tape & Reel format. Additionally, SN74ALS38BNSR has a wider package body (0.209" vs. 0.154"), which may affect PCB layout compatibility.

Q: Why is SN74ALS38BD marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has announced end-of-life for this part number. While currently available, future procurement may not be possible. SN74ALS38BDR, with active status, is the recommended choice for new designs.

Q: Are all substitute parts ROHS3 compliant?

A: SN74ALS38BDR, SN74ALS38BNSR, and SN74ALS38BD are all ROHS3 compliant. The original DM74ALS38AM RoHS status is not specified in available documentation.

Q: Do the substitute parts maintain the same open collector output characteristics?

A: Yes. All substitute parts feature open collector output with 24mA maximum output low current, identical to the DM74ALS38AM specification.

Q: What is the impact of package width difference in SN74ALS38BNSR?

A: The wider package body (0.209" vs. 0.154") may require PCB layout verification to ensure adequate spacing between adjacent components. Pin pitch and electrical characteristics remain unchanged.

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