DM74ALS125MX Equivalent & Substitute Parts

Part Overview

The DM74ALS125MX is a Buffer, Non-Inverting 4 Element logic IC manufactured by onsemi in 14-SOIC surface mount packaging. This component provides 3-State output capability with a supply voltage range of 4.5V to 5.5V and operates across the industrial temperature range of 0°C to 70°C. The product is currently classified as Obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

DM74ALS125MX

onsemiIn Stock: 5633DM74ALS125MX Datasheet

Current PartRFQ

SN74LS125ADR

Texas InstrumentsIn Stock: 2614SN74LS125ADR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74ALS125MX is determined by strict equivalence across the following critical parameters:

• Logic function: Buffer, Non-Inverting with 4 elements, 1 bit per element
• Output configuration: 3-State output capability
• Package form factor: 14-SOIC surface mount package with identical 0.154" (3.90mm) width
• Operating temperature range: 0°C to 70°C
• Moisture sensitivity: MSL 1 (Unlimited)

The SN74LS125ADR from Texas Instruments meets all functional and physical requirements for direct substitution. Both parts share identical logic architecture, pin configuration, and package specifications. Voltage supply ranges differ slightly (4.75V–5.25V for the substitute versus 4.5V–5.5V for the original), with the substitute operating within a narrower but overlapping window suitable for standard 5V logic applications.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS125ADR is the qualified substitute for the DM74ALS125MX based on functional equivalence and product availability. The original part's Obsolete status necessitates transition to an Active product for long-term supply chain reliability. The SN74LS125ADR maintains identical logic function, pin configuration, and package form factor while offering ROHS3 compliance certification, supporting modern manufacturing and environmental standards.

The output current specification for the high state differs between parts (15mA versus 2.6mA), reflecting the ALS versus LS logic family distinction. This difference is acceptable in applications where the original 15mA specification was not a critical design requirement. Systems requiring the higher output current of the original ALS device should be evaluated for alternative solutions within the ALS logic family.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS125ADR directly replace the DM74ALS125MX without PCB modifications?

A: Yes. Both parts use identical 14-SOIC packaging with matching pin assignments and footprints. No PCB layout changes are required for physical substitution.

Q: What is the significance of the voltage supply range difference?

A: The DM74ALS125MX operates from 4.5V to 5.5V, while the SN74LS125ADR operates from 4.75V to 5.25V. Standard 5V logic systems operate within both ranges. Applications requiring operation below 4.75V or above 5.25V must verify compatibility with the substitute part's narrower specification window.

Q: Why does the output current specification differ between the two parts?

A: The DM74ALS125MX belongs to the ALS (Advanced Low-power Schottky) logic family, while the SN74LS125ADR belongs to the LS (Low-power Schottky) family. These families have different electrical characteristics. The ALS device provides higher output current (15mA high state) compared to the LS device (2.6mA high state). Verify that your application does not depend on the higher current capability before substitution.

Q: Is the SN74LS125ADR suitable for new designs?

A: Yes. The SN74LS125ADR carries Active product status and ROHS3 compliance, making it appropriate for new designs requiring a 4-element non-inverting buffer with 3-State output in 14-SOIC packaging.

Q: What does MSL 1 (Unlimited) mean for component handling?

A: MSL 1 indicates the lowest moisture sensitivity level. Components with this rating have unlimited shelf life and do not require special moisture control during storage or handling, simplifying logistics and inventory management for both parts.