DM74ALS27MX Equivalent & Substitute Parts

Part Overview

The DM74ALS27MX is a NOR Gate IC featuring 3 channels with 3 inputs per channel in a 14-SOIC surface mount package, manufactured by onsemi. This logic component operates within the 74ALS series and is classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity and procurement planning. Substitute parts maintain identical or compatible electrical and mechanical specifications while offering improved availability and product status.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	3
Number of Inputs	3
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	15ns @ 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

Substitute parts for the DM74ALS27MX are classified based on the following substitution criteria:

Direct Manufacturer Equivalent (SN74ALS27AD): Identical electrical specifications and package dimensions. Differs only in packaging format (Tube vs. unspecified) and product status (Last Time Buy). Suitable for direct replacement in existing designs.

Similar Manufacturer Part (SN74ALS27ANSR): Maintains all critical electrical parameters and operating characteristics. Package case dimensions differ slightly (0.209" vs. 0.154" width), though both are 14-SO/SOIC variants. Supplied in Tape & Reel format with Active product status.

Parametric Equivalent (SN74ALS27ADR): Fully compatible electrical and mechanical specifications with identical package dimensions. Supplied in Tape & Reel format with Active product status.

All substitutes share the following critical parameters with the main part:

Logic Type: NOR Gate
Number of Circuits: 3
Number of Inputs: 3
Voltage Supply: 4.5V ~ 5.5V
Output Current: 400µA, 8mA
Input Logic Levels: 0.8V (Low), 2V (High)
Propagation Delay: 15ns @ 5V, 50pF
Operating Temperature: 0°C ~ 70°C
Mounting Type: Surface Mount
MSL Rating: 1 (Unlimited)

Parameter Comparison

Parameter	DM74ALS27MX (onsemi)	SN74ALS27AD (TI)	SN74ALS27ANSR (TI)	SN74ALS27ADR (TI)
Logic Type	NOR Gate	NOR Gate	NOR Gate	NOR Gate
Number of Circuits	3	3	3	3
Number of Inputs	3	3	3	3
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	15ns @ 5V, 50pF	15ns @ 5V, 50pF	15ns @ 5V, 50pF	15ns @ 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	Last Time Buy	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Not specified	Tube	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

For Direct PCB Replacement: SN74ALS27ADR or SN74ALS27AD are preferred due to identical package dimensions (0.154", 3.90mm width) matching the original DM74ALS27MX footprint. Both Texas Instruments parts carry ROHS3 compliance certification.

For Long-Term Availability: SN74ALS27ADR and SN74ALS27ANSR both maintain Active product status, ensuring sustained supply and manufacturing support. SN74ALS27AD carries Last Time Buy status, indicating limited future availability.

For Package Compatibility Consideration: SN74ALS27ANSR features a wider 14-SOIC package (0.209" vs. 0.154" width). While electrically equivalent, PCB layout verification is required if footprint spacing is constrained.

Compliance Consideration: All Texas Instruments substitutes are ROHS3 compliant, supporting modern environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS27ANSR replace DM74ALS27MX directly on the PCB? A: Electrical substitution is complete. However, SN74ALS27ANSR uses a wider 14-SOIC package (0.209" width vs. 0.154" width). PCB footprint compatibility must be verified before implementation. If PCB layout permits the wider package, substitution is valid.

Q: What is the difference between SN74ALS27AD and SN74ALS27ADR? A: Both parts are electrically and mechanically identical with matching package dimensions. The primary difference is packaging format: SN74ALS27AD is supplied in Tube format, while SN74ALS27ADR is supplied in Tape & Reel (TR) format. SN74ALS27ADR maintains Active product status, while SN74ALS27AD is Last Time Buy.

Q: Why is the DM74ALS27MX obsolete? A: The DM74ALS27MX is classified as obsolete by onsemi. Texas Instruments equivalents (SN74ALS27 series) remain in active production, making them the recommended substitutes for new designs and ongoing procurement.

Q: Are all substitutes RoHS compliant? A: Yes. All three Texas Instruments substitute parts (SN74ALS27AD, SN74ALS27ANSR, SN74ALS27ADR) are ROHS3 compliant, meeting current environmental standards.

Q: Which substitute offers the best long-term availability? A: SN74ALS27ADR and SN74ALS27ANSR both carry Active product status, ensuring sustained manufacturing and supply. SN74ALS27AD is Last Time Buy, indicating limited future availability.

Q: Do all substitutes operate at the same voltage and temperature range? A: Yes. All substitutes maintain identical supply voltage (4.5V ~ 5.5V) and operating temperature range (0°C ~ 70°C) as the original DM74ALS27MX.

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