DM74LS374N Equivalent & Substitute Parts

Part Overview

The DM74LS374N is a D-Type flip-flop logic integrated circuit with 1 element and 8 bits per element, housed in a 20-DIP package. This component functions as a standard positive edge-triggered flip-flop with tri-state, non-inverted outputs. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations where legacy compatibility is required.

Substiute Parts

DM74LS374N

onsemiIn Stock: 2022DM74LS374N Datasheet

Current PartRFQ

SN74LS374N

onsemiIn Stock: 3759SN74LS374N Datasheet

DirectRFQ

SN74LS377N

Texas InstrumentsIn Stock: 2186SN74LS377N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DM74LS374N is determined by the following critical parameters:

Primary Compatibility Criteria:

• D-Type flip-flop architecture with positive edge triggering
• 8-bit configuration (1 element, 8 bits per element)
• 20-DIP package footprint (0.300", 7.62mm)
• Through-hole mounting compatibility
• Voltage supply range: 4.75V ~ 5.25V
• Operating temperature range: 0°C ~ 70°C

Acceptable Variations:

• Clock frequency equal to or greater than 20 MHz
• Output type (tri-state non-inverted or complementary outputs acceptable with circuit verification)
• Current specifications within compatible ranges for the application
• Quiescent current variations acceptable if within system power budget

Parameter Comparison

Engineering Selection Recommendations

SN74LS374N (Direct Substitute): The SN74LS374N is a direct functional equivalent manufactured by onsemi. It maintains identical output type (tri-state, non-inverted), current specifications, and voltage supply parameters. The higher clock frequency rating (50 MHz versus 20 MHz) provides additional performance margin. Both parts share obsolete product status. This substitute is suitable for direct replacement in existing designs without circuit modification.

SN74LS377N (Compatible Alternative): The SN74LS377N, manufactured by Texas Instruments, provides an active product status alternative with ROHS3 compliance. The complementary output type differs from the original tri-state non-inverted configuration, requiring circuit verification before implementation. The lower output current specifications (400µA high, 8mA low) necessitate evaluation against system load requirements. The higher clock frequency (40 MHz) exceeds the original specification. This substitute is suitable for new designs prioritizing long-term component availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can SN74LS374N be used as a direct replacement for DM74LS374N? A: Yes. The SN74LS374N is functionally equivalent with identical output type, current ratings, and voltage specifications. Pin configuration and package footprint are identical. No circuit modifications are required.

Q: What is the key difference between SN74LS374N and SN74LS377N? A: The primary difference is output type. SN74LS374N provides tri-state non-inverted outputs matching the original DM74LS374N. SN74LS377N provides complementary outputs, requiring circuit verification for compatibility. Additionally, SN74LS377N is active product status with ROHS3 compliance, while SN74LS374N is obsolete.

Q: Is the SN74LS377N suitable for legacy system replacement? A: The SN74LS377N can be used if the circuit design accommodates complementary outputs. The lower output current specifications must be verified against system load requirements. The active product status makes it suitable for long-term availability.

Q: Are all three parts pin-compatible? A: All three parts use the 20-DIP package with identical footprint (0.300", 7.62mm). Pin compatibility depends on output type requirements. SN74LS374N is directly pin-compatible with DM74LS374N. SN74LS377N requires output type verification.

Q: What compliance considerations apply to substitute selection? A: DM74LS374N and SN74LS374N are RoHS non-compliant. SN74LS377N is ROHS3 compliant. For applications requiring regulatory compliance, SN74LS377N is the appropriate selection if output type compatibility is confirmed.