DM74LS112AN Equivalent & Substitute Parts

Part Overview

The DM74LS112AN is a dual JK-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 16-DIP package. This component functions as a 2-element, 1-bit per element flip-flop with Set (Preset) and Reset capabilities, triggered on negative edge clock transitions. The part is classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs requiring this logic function.

Substiute Parts

DM74LS112AN

onsemiIn Stock: 1537DM74LS112AN Datasheet

Current PartRFQ

SN74LS112AN

Texas InstrumentsIn Stock: 4726SN74LS112AN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74LS112AN is determined by strict equivalence across the following critical parameters:

• Logic Function: Dual JK-type flip-flop with Set/Reset capability
• Trigger Mechanism: Negative edge clock triggering
• Output Configuration: Complementary outputs
• Electrical Specifications: Supply voltage range 4.75V ~ 5.25V, operating temperature 0°C ~ 70°C
• Physical Package: 16-DIP (0.300", 7.62mm) through-hole mounting
• Series Compatibility: 74LS logic family

The SN74LS112AN from Texas Instruments meets all functional and electrical requirements for direct substitution. Both parts share identical logic architecture, pin configuration, and electrical operating parameters within the specified ranges.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS112AN from Texas Instruments is the direct functional equivalent for the obsolete DM74LS112AN. Both parts are electrically and mechanically interchangeable within the specified operating parameters.

Product Status Consideration: The DM74LS112AN is obsolete, while the SN74LS112AN maintains active production status. For new designs and long-term system support, the SN74LS112AN is the appropriate selection.

Compliance Status: The SN74LS112AN is ROHS3 compliant, whereas the DM74LS112AN is RoHS non-compliant. Systems requiring RoHS compliance must use the SN74LS112AN.

Performance Characteristics: The SN74LS112AN demonstrates improved performance specifications, including higher maximum clock frequency (45 MHz vs. 25 MHz) and reduced propagation delay (20ns vs. 24ns). These enhancements provide operational margin without compromising compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS112AN directly replace the DM74LS112AN in existing designs?

A: Yes. Both parts share identical pin configuration, logic function, and electrical operating parameters. Direct substitution is possible without circuit modification.

Q: Are there any package differences between these parts?

A: No. Both parts use the 16-DIP (0.300", 7.62mm) through-hole package with identical pin assignments.

Q: What is the significance of the improved clock frequency and propagation delay in the SN74LS112AN?

A: The SN74LS112AN operates at 45 MHz maximum clock frequency compared to 25 MHz for the DM74LS112AN, and exhibits lower propagation delay (20ns vs. 24ns). These specifications indicate improved performance margin and faster switching characteristics, making the SN74LS112AN suitable for applications requiring higher speed operation.

Q: Does the RoHS compliance difference affect substitution?

A: RoHS compliance is a regulatory and procurement consideration. Systems or applications subject to RoHS requirements must use the ROHS3-compliant SN74LS112AN. For applications without RoHS mandates, both parts are functionally equivalent.

Q: Are the supply voltage and operating temperature ranges identical?

A: Yes. Both parts operate within 4.75V to 5.25V supply voltage and 0°C to 70°C operating temperature range, with identical quiescent current specifications (6 mA).