DM74ALS27N NOR Gate IC Equivalent & Substitute Parts

Part Overview

The DM74ALS27N is a 3-channel NOR gate logic IC manufactured by onsemi in a 14-pin DIP package. This component implements three independent 3-input NOR logic functions and operates within the standard 4.5V to 5.5V supply voltage range. The DM74ALS27N is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations. Substitute parts must maintain identical electrical characteristics, logic functionality, and physical packaging to ensure direct replacement capability.

Substiute Parts

DM74ALS27N

onsemiIn Stock: 1295DM74ALS27N Datasheet

Current PartRFQ

SN74ALS27AN

Texas InstrumentsIn Stock: 2451SN74ALS27AN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74ALS27N is determined by strict equivalence across the following critical parameters:

• Logic Function: Both parts must implement 3-channel, 3-input NOR gate logic
• Electrical Specifications: Supply voltage (4.5V ~ 5.5V), output current (400µA, 8mA), input logic levels (0.8V low, 2V high), and propagation delay (15ns @ 5V, 50pF) must be identical
• Physical Package: 14-pin DIP package with 0.300" (7.62mm) pitch is mandatory for through-hole mounting compatibility
• Base Product Series: 74ALS series designation ensures functional and electrical compatibility
• Operating Temperature Range: 0°C ~ 70°C operational envelope must be maintained

The SN74ALS27AN from Texas Instruments satisfies all substitution criteria and is classified as an active product with current manufacturing support.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS27AN is the direct substitute for the obsolete DM74ALS27N. Both components share identical electrical specifications, logic functionality, and physical packaging. The SN74ALS27AN maintains active product status with current manufacturing availability, ensuring long-term supply chain reliability. Both parts comply with REACH regulations and carry the same export classification (EAR99). The Texas Instruments SN74ALS27AN is RoHS3 compliant, providing additional environmental compliance assurance for new designs and legacy system replacements.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS27AN be used as a direct replacement for the DM74ALS27N?

A: Yes. The SN74ALS27AN is a direct substitute. Both components implement identical 3-channel, 3-input NOR gate logic with matching electrical specifications, operating temperature range, and 14-pin DIP package configuration.

Q: Are there any differences in package dimensions between these parts?

A: No. Both the DM74ALS27N and SN74ALS27AN use the 14-DIP package with 0.300" (7.62mm) pitch, ensuring identical through-hole mounting compatibility on PCBs designed for either component.

Q: What is the significance of the DM74ALS27N being classified as obsolete?

A: Obsolete status indicates that onsemi has discontinued manufacturing. The SN74ALS27AN from Texas Instruments remains in active production, making it the recommended choice for new designs and system maintenance requiring long-term component availability.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the DM74ALS27N and SN74ALS27AN are REACH unaffected and classified under ECCN EAR99. The SN74ALS27AN additionally carries RoHS3 compliance certification.

Q: Are the electrical performance characteristics identical between these parts?

A: Yes. Supply voltage (4.5V ~ 5.5V), output current (400µA, 8mA), input logic levels (0.8V low, 2V high), and propagation delay (15ns @ 5V, 50pF) are identical across both components.