DM74LS174M Equivalent & Substitute Parts

Part Overview

The DM74LS174M is a 6-bit D-type flip-flop logic integrated circuit manufactured by onsemi in a 16-SOIC surface mount package. This component functions as a master reset flip-flop with positive edge triggering and non-inverted outputs. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for design continuity and procurement planning. Substitute parts must maintain functional equivalence across electrical characteristics, package compatibility, and operational parameters to ensure reliable circuit performance.

Substiute Parts

DM74LS174M

onsemiIn Stock: 1282DM74LS174M Datasheet

Current PartRFQ

SN74LS174D

Texas InstrumentsIn Stock: 1080SN74LS174D Datasheet

DirectRFQ

SN74LS174DR

Texas InstrumentsIn Stock: 3783SN74LS174DR Datasheet

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SN74LS174NSR

Texas InstrumentsIn Stock: 6403SN74LS174NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM74LS174M are identified based on strict equivalence across the following critical parameters:

Functional Equivalence: All substitute parts must maintain the same logic function (D-type flip-flop with 6-bit configuration), master reset capability, positive edge triggering, and non-inverted output type.

Electrical Compatibility: Supply voltage range (4.75V ~ 5.25V), output current specifications (400µA high, 8mA low), and operating temperature range (0°C ~ 70°C) must be maintained or exceeded.

Package Compatibility: The primary substitute (SN74LS174D and SN74LS174DR) uses the identical 16-SOIC package with 0.154" width (3.90mm), ensuring direct PCB footprint compatibility. The secondary substitute (SN74LS174NSR) uses a 16-SOIC package with 0.209" width (5.30mm), which requires PCB layout verification before implementation.

Series Consistency: All substitutes belong to the 74LS logic family, maintaining TTL-compatible logic levels and timing characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes: SN74LS174D and SN74LS174DR (Texas Instruments) are direct functional and package equivalents to the DM74LS174M. Both parts maintain identical 16-SOIC (0.154", 3.90mm) package dimensions, enabling direct PCB footprint compatibility without layout modifications. SN74LS174DR is recommended for new designs due to its active product status and availability in tape & reel packaging. SN74LS174D remains available as a last-time-buy option. Both parts exceed the original clock frequency specification (40 MHz vs. 30 MHz) and carry ROHS3 compliance certification.

Secondary Substitute: SN74LS174NSR (Texas Instruments) provides functional equivalence with identical electrical characteristics but uses a wider 16-SOIC package (0.209", 5.30mm width). This part is suitable only for applications where PCB layout permits the increased package width or where existing footprints accommodate the larger dimensions. This part is active and ROHS3 compliant.

Procurement Priority: For new designs and production continuity, SN74LS174DR is the recommended choice based on active product status, standard packaging format, and full compliance certifications. Existing designs using the DM74LS174M can transition to SN74LS174D or SN74LS174DR without circuit modifications.

Frequently Asked Questions (FAQ)

Q: Can SN74LS174D, SN74LS174DR, and SN74LS174NSR be used interchangeably with the DM74LS174M?

A: SN74LS174D and SN74LS174DR are direct substitutes with identical package dimensions (16-SOIC, 0.154" width) and can be used interchangeably without PCB modifications. SN74LS174NSR has a wider package body (0.209" width) and requires PCB layout verification before implementation.

Q: What is the difference between SN74LS174D and SN74LS174DR?

A: Both parts are functionally identical with the same electrical specifications and package dimensions. The primary difference is packaging format: SN74LS174D is supplied in tube packaging, while SN74LS174DR is supplied in tape & reel format. SN74LS174DR is preferred for automated assembly processes.

Q: Are the substitute parts ROHS compliant?

A: Yes. SN74LS174D, SN74LS174DR, and SN74LS174NSR are all ROHS3 compliant. The original DM74LS174M RoHS status was not specified in the available data.

Q: Does the higher clock frequency (40 MHz) of the substitute parts affect circuit compatibility?

A: No. The substitute parts' higher clock frequency specification (40 MHz vs. 30 MHz) represents improved performance and does not create compatibility issues. Circuits designed for the original 30 MHz specification will operate correctly with the higher-rated substitutes.

Q: What is the moisture sensitivity level for these parts?

A: All parts, including the DM74LS174M and its substitutes, have a moisture sensitivity level (MSL) of 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

Q: Can I use SN74LS174NSR as a direct replacement on existing PCBs designed for DM74LS174M?

A: SN74LS174NSR has a different package width (0.209" vs. 0.154") and may not fit existing PCB footprints designed for the DM74LS174M. Verify PCB layout dimensions before substitution. SN74LS174D or SN74LS174DR are recommended for direct PCB compatibility.