DM74ALS32M Equivalent & Substitute Parts

Part Overview

The DM74ALS32M is a 4-channel 2-input OR gate logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The DM74ALS32M operates within the 74ALS logic family standard, which defines compatible electrical and mechanical parameters for direct substitution across qualified manufacturers.

Key Parameters

Parameter	Value
Logic Type	OR Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	4.5V ~ 5.5V
Current - Output High, Low	400µA, 8mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	14ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DM74ALS32M is determined by strict adherence to the 74ALS logic family standard. All substitute parts must maintain identical electrical parameters: 4.5V to 5.5V supply voltage, 400µA/8mA output current ratings, 0.8V/2V input logic levels, and 14ns maximum propagation delay at 5V with 50pF load. All candidates must support 0°C to 70°C operating temperature range and surface mount configuration.

The substitute parts are grouped as follows:

Direct Manufacturer Equivalent (SN74ALS32DR): Texas Instruments part with identical 14-SOIC packaging (0.154", 3.90mm width), active product status, and ROHS3 compliance.

Similar Manufacturer Equivalent (SN74ALS32NSR): Texas Instruments part with identical electrical specifications but different package width (0.209", 5.30mm) classified as 14-SO. Electrical parameters remain fully compatible.

Parametric Equivalent (SN74ALS32D): Texas Instruments part with identical electrical specifications and 14-SOIC packaging (0.154", 3.90mm width), available in tube packaging with last-time-buy status.

Parameter Comparison

Parameter	DM74ALS32M (onsemi)	SN74ALS32DR (TI)	SN74ALS32NSR (TI)	SN74ALS32D (TI)
Logic Type	OR Gate	OR Gate	OR Gate	OR Gate
Number of Circuits	4	4	4	4
Number of Inputs	2	2	2	2
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Output High, Low	400µA, 8mA	400µA, 8mA	400µA, 8mA	400µA, 8mA
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	14ns @ 5V, 50pF	14ns @ 5V, 50pF	14ns @ 5V, 50pF	14ns @ 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
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Selection: SN74ALS32DR

The SN74ALS32DR from Texas Instruments is the recommended primary substitute. It maintains active product status with ROHS3 compliance, identical 14-SOIC packaging dimensions (0.154", 3.90mm width), and all electrical parameters matching the DM74ALS32M specification. This part offers the highest availability and longest product lifecycle support.

Secondary Selection: SN74ALS32NSR

The SN74ALS32NSR provides full electrical compatibility with active product status and ROHS3 compliance. The package width difference (0.209" vs 0.154") requires PCB layout verification for footprint compatibility, though the 14-SO and 14-SOIC packages share identical pin configurations and pitch.

Tertiary Selection: SN74ALS32D

The SN74ALS32D offers identical electrical specifications and packaging dimensions to the primary selection but carries last-time-buy status. This part is suitable only for applications where long-term supply is not required or where existing inventory can support future demand.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS32NSR be used as a direct PCB replacement for DM74ALS32M?

A: Electrical substitution is complete. However, the SN74ALS32NSR package width (0.209", 5.30mm) differs from the DM74ALS32M (0.154", 3.90mm). PCB footprint compatibility must be verified before assembly. Pin configuration and pitch remain identical.

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

A: Both are 14-pin surface mount packages with identical pin pitch and configuration. The primary difference is package body width. The 14-SOIC (0.154") is narrower than the 14-SO (0.209"). Electrical performance is identical.

Q: Why is the DM74ALS32M classified as obsolete?

A: Obsolete status indicates the manufacturer (onsemi) has discontinued production. Active equivalents from Texas Instruments ensure continued design support and component availability.

Q: Are all substitute parts ROHS3 compliant?

A: SN74ALS32DR and SN74ALS32NSR are ROHS3 compliant. SN74ALS32D is also ROHS3 compliant. The original DM74ALS32M carries REACH Unaffected status.

Q: What is the MSL rating and why does it matter?

A: All parts carry MSL 1 (Unlimited) rating, indicating unlimited shelf life without moisture sensitivity concerns. This simplifies storage and handling requirements.

Q: Can these parts be used interchangeably in existing designs?

A: Electrical interchangeability is complete across all substitute parts. Physical interchangeability depends on PCB footprint design. SN74ALS32DR and SN74ALS32D are direct footprint matches. SN74ALS32NSR requires footprint verification due to package width difference.

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