DM74LS174N Equivalent & Substitute Parts

Part Overview

The DM74LS174N is a 6-bit D-type flip-flop logic integrated circuit manufactured by onsemi in a 16-DIP through-hole package. This component functions as a master reset flip-flop with positive edge triggering, commonly used in digital logic applications requiring parallel data storage and synchronization. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing design support and production continuity.

Substiute Parts

DM74LS174N

onsemiIn Stock: 6882DM74LS174N Datasheet

Current PartRFQ

SN74LS174D

Texas InstrumentsIn Stock: 1080SN74LS174D Datasheet

DirectRFQ

SN74LS174DR

Texas InstrumentsIn Stock: 3783SN74LS174DR Datasheet

DirectRFQ

SN74LS174N

Texas InstrumentsIn Stock: 2373SN74LS174N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74LS174N is determined by strict adherence to the following electrical and mechanical parameters:

Critical Compatibility Parameters:

• Base product number: 74LS174
• Function: Master Reset D-Type Flip-Flop
• Number of bits per element: 6
• Trigger type: Positive Edge
• Output type: Non-Inverted
• Voltage supply range: 4.75V ~ 5.25V
• Operating temperature range: 0°C ~ 70°C

Package Considerations: Substitutes are grouped by mounting type. Through-hole DIP packages maintain direct pin compatibility with the original DM74LS174N. Surface-mount SOIC packages require PCB redesign but provide electrical equivalence for new designs.

Identified Substitute Parts:

• SN74LS174N (Texas Instruments, 16-DIP through-hole)
• SN74LS174D (Texas Instruments, 16-SOIC surface-mount)
• SN74LS174DR (Texas Instruments, 16-SOIC surface-mount, tape & reel)

Parameter Comparison

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (Through-Hole Applications): SN74LS174N is the primary substitute for the DM74LS174N. Both components use identical 16-DIP through-hole packaging, enabling direct socket replacement without PCB modification. SN74LS174N is currently in active production status with ROHS3 compliance, providing long-term supply assurance and regulatory alignment.

For New Designs or Surface-Mount Applications: SN74LS174D and SN74LS174DR provide electrical equivalence in surface-mount SOIC packaging. These parts require PCB redesign but offer improved thermal characteristics and manufacturing efficiency. SN74LS174DR in tape & reel packaging is recommended for high-volume production. SN74LS174D in tube packaging is suitable for lower-volume applications.

Compliance Considerations: All Texas Instruments substitutes (SN74LS174N, SN74LS174D, SN74LS174DR) are ROHS3 compliant, whereas the original DM74LS174N is RoHS non-compliant. This distinction is critical for applications subject to environmental regulations or customer requirements mandating RoHS compliance.

Frequently Asked Questions (FAQ)

Q: Can SN74LS174N be used as a direct replacement for DM74LS174N? A: Yes. Both parts share identical 16-DIP through-hole packaging, electrical specifications, and functional characteristics. No PCB modification is required for direct substitution.

Q: What is the difference between SN74LS174D and SN74LS174DR? A: Both parts are electrically identical 16-SOIC surface-mount devices. The primary difference is packaging format: SN74LS174D is supplied in tubes, while SN74LS174DR is supplied in tape & reel format. Tape & reel packaging is standard for automated assembly processes in high-volume production.

Q: Why does the DM74LS174N have a lower clock frequency (30 MHz) than the Texas Instruments substitutes (40 MHz)? A: The specified clock frequency represents the maximum operating frequency for each part. Texas Instruments substitutes have higher maximum ratings, providing additional performance margin. Both parts operate correctly within the 30 MHz specification of the original design.

Q: Are surface-mount substitutes (SN74LS174D, SN74LS174DR) compatible with existing through-hole PCBs? A: No. Surface-mount SOIC packages require different PCB footprints and assembly processes than through-hole DIP packages. Surface-mount substitutes are suitable only for new PCB designs or redesigned boards.

Q: What is the significance of RoHS compliance for substitute selection? A: RoHS3 compliance indicates the part meets environmental restrictions on hazardous substances. If your application or customer requirements mandate RoHS compliance, all Texas Instruments substitutes satisfy this requirement, whereas the original DM74LS174N does not.

Q: Is inventory availability a factor in substitute selection? A: Inventory levels vary by supplier and time. SN74LS174DR has the highest reported inventory (3700 pcs), followed by SN74LS174N (2266 pcs) and SN74LS174D (982 pcs). For critical applications, verify current availability with your component supplier.