DM74AS32MX Equivalent & Substitute Parts

Part Overview

The DM74AS32MX 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 substitute parts necessary for ongoing design support and procurement. The DM74AS32MX operates within the 74AS logic family standard, providing TTL-compatible switching functionality with specified propagation delays suitable for general-purpose digital logic applications.

Key Parameters

Parameter	Value
Logic Type	OR Gate
Number of Circuits	4
Number of Inputs	2
Voltage Supply Range	4.5V ~ 5.5V
Output Current (High/Low)	2mA / 20mA
Input Logic Level Low	0.8V
Input Logic Level High	2V
Max Propagation Delay	5.8ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package	14-SOIC
Series	74AS

Substitute Part Grouping Explanation

Substitution eligibility for the DM74AS32MX is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Logic type: OR Gate
Circuit count: 4 channels
Input count: 2 inputs per channel
Supply voltage range: 4.5V ~ 5.5V
Input logic levels: Low ≤ 0.8V, High ≥ 2V
Operating temperature range: 0°C ~ 70°C
Mounting type: Surface Mount
Package type: 14-SOIC or 14-SO

Acceptable Parameter Variations:

Output current specifications may exceed minimum requirements (higher current capability is acceptable)
Propagation delay may be equal to or slightly exceed 5.8ns
Product status may differ (active, last time buy, or obsolete)
Packaging format may vary (tube, tape & reel)
Manufacturer may differ while maintaining functional equivalence

Parameter Comparison

Parameter	DM74AS32MX (onsemi)	SN74AS32D (TI)	SN74AS1032AD (TI)	SN74AS32NSR (TI)	SN74AS32DR (TI)
Logic Type	OR Gate	OR Gate	OR Gate	OR Gate	OR Gate
Circuits / Inputs	4 / 2	4 / 2	4 / 2	4 / 2	4 / 2
Supply Voltage	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Output Current (H/L)	2mA / 20mA	2mA / 20mA	48mA / 48mA	2mA / 20mA	2mA / 20mA
Input Logic Levels	0.8V / 2V	0.8V / 2V	0.8V / 2V	0.8V / 2V	0.8V / 2V
Max Propagation Delay	5.8ns @ 5V, 50pF	5.8ns @ 5V, 50pF	6.3ns @ 5V, 50pF	5.8ns @ 5V, 50pF	5.8ns @ 5V, 50pF
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
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)	14-SOIC (0.154", 3.90mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Last Time Buy	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Functional Equivalents (Recommended Primary Choices):

SN74AS32D, SN74AS32NSR, and SN74AS32DR are direct functional equivalents to the DM74AS32MX. All three maintain identical electrical specifications including output current, propagation delay, and logic thresholds. SN74AS32DR is the preferred choice for new designs due to active product status and ROHS3 compliance. SN74AS32NSR offers the highest inventory availability. SN74AS32D remains available as a last-time-buy option.

Alternative with Enhanced Output Current:

SN74AS1032AD provides equivalent logic functionality with significantly higher output current capability (48mA vs. 2mA high, 48mA vs. 20mA low). This part operates on the 74AS1032 base product number and exhibits a marginally longer propagation delay of 6.3ns. This substitute is suitable only when increased output drive capability is required and the additional propagation delay is acceptable for the application.

Package Considerations:

SN74AS32NSR uses a 14-SO package with 5.30mm width versus the standard 14-SOIC 3.90mm width of other equivalents. This dimensional difference requires PCB layout verification before substitution.

Compliance and Availability:

All Texas Instruments substitutes carry ROHS3 compliance certification. The DM74AS32MX obsolete status necessitates transition to an active equivalent. SN74AS32DR provides the best long-term availability and compliance profile for new procurement.

Frequently Asked Questions (FAQ)

Q: Can SN74AS1032AD replace DM74AS32MX in all applications?

A: SN74AS1032AD is functionally equivalent for logic operation but differs in output current specifications (48mA vs. 2mA/20mA) and propagation delay (6.3ns vs. 5.8ns). Substitution is valid only if the application does not depend on the original output current limits and can tolerate the additional 0.5ns propagation delay.

Q: What is the difference between SN74AS32D and SN74AS32DR?

A: Both parts are electrically identical. SN74AS32D is supplied in tube packaging and carries last-time-buy status. SN74AS32DR is supplied in tape & reel format and maintains active product status. For new designs, SN74AS32DR is preferred.

Q: Is SN74AS32NSR compatible with the original DM74AS32MX PCB layout?

A: SN74AS32NSR uses a 14-SO package with 5.30mm width compared to the 14-SOIC 3.90mm width of DM74AS32MX. Pin pitch remains identical, but the wider package body requires PCB footprint verification. Electrical functionality is fully compatible.

Q: Are all substitute parts RoHS compliant?

A: All Texas Instruments substitutes (SN74AS32D, SN74AS1032AD, SN74AS32NSR, SN74AS32DR) carry ROHS3 compliance certification. The original DM74AS32MX RoHS status is not specified.

Q: Which substitute offers the best long-term availability?

A: SN74AS32DR maintains active product status with the highest inventory level (4,725 pcs) and ROHS3 compliance, making it the optimal choice for long-term design support and procurement continuity.

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