DM74125N Equivalent & Substitute Parts

Part Overview

The DM74125N is a non-inverting buffer IC manufactured by onsemi, featuring 4 elements with 1 bit per element and 3-state output capability. This component belongs to the 7400 logic series and operates within the 4.75V to 5.25V supply voltage range. The DM74125N is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations where legacy compatibility is required.

Substiute Parts

DM74125N

onsemiIn Stock: 1407DM74125N Datasheet

Current PartRFQ

SN74LS125AN

Texas InstrumentsIn Stock: 2566SN74LS125AN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74125N is determined by strict equivalence across the following parameters:

• Logic function: Non-inverting buffer with 4 elements, 1 bit per element
• Output configuration: 3-state output capability
• Supply voltage range: 4.75V to 5.25V
• Package form factor: 14-DIP through-hole mounting
• Operating temperature range: 0°C to 70°C

The SN74LS125AN from Texas Instruments satisfies all these core functional and physical requirements. While the 74LS series represents a different logic family (low-power Schottky) compared to the standard 7400 series, both parts maintain electrical compatibility within the specified voltage and temperature parameters and share identical pinout and package geometry.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS125AN is the direct functional equivalent for DM74125N replacement applications. Both parts maintain identical logic function, pinout, and package configuration. The SN74LS125AN offers the advantage of active product status, ensuring continued availability and supply chain reliability. Additionally, the SN74LS125AN meets ROHS3 compliance requirements, whereas the DM74125N is non-compliant.

Output current characteristics differ between the two parts: the DM74125N provides 5.2mA high and 16mA low, while the SN74LS125AN provides 2.6mA high and 24mA low. These differences reflect the distinct logic family implementations but remain within acceptable operating margins for standard 5V logic applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS125AN directly replace the DM74125N in existing designs?

A: Yes. Both parts share identical pinout, package geometry (14-DIP), and core logic function. Direct socket substitution is possible without circuit modification.

Q: What is the primary reason to substitute the DM74125N?

A: The DM74125N is classified as obsolete. The SN74LS125AN is an active product with established supply availability, making it the preferred choice for new designs and ongoing system support.

Q: Are there differences in output current specifications?

A: Yes. The DM74125N specifies 5.2mA output high and 16mA output low, while the SN74LS125AN specifies 2.6mA output high and 24mA output low. Both operate within standard 5V logic voltage levels and are compatible with typical TTL/CMOS interface requirements.

Q: Does the SN74LS125AN meet modern compliance standards?

A: Yes. The SN74LS125AN is ROHS3 compliant, whereas the DM74125N is non-compliant. This makes the SN74LS125AN suitable for applications requiring regulatory compliance.

Q: Are both parts rated for the same operating temperature range?

A: Yes. Both the DM74125N and SN74LS125AN operate across 0°C to 70°C (TA), maintaining identical thermal specifications.

Q: What is the package form factor for both parts?

A: Both parts use 14-DIP (0.300", 7.62mm) through-hole packaging, enabling direct mechanical and electrical compatibility in PCB designs.