DM74LS14M Equivalent & Substitute Parts

Part Overview

The DM74LS14M is a 6-channel inverter IC with Schmitt trigger inputs in a 14-SOIC surface mount package, manufactured by onsemi. This logic component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design support and procurement. The functional characteristics—6 inverter circuits with Schmitt trigger hysteresis, operating at 4.75V to 5.25V supply voltage—remain consistent across qualified substitutes, enabling direct replacement in compatible applications.

Substiute Parts

DM74LS14M

onsemiIn Stock: 1096DM74LS14M Datasheet

Current PartRFQ

SN74LS14D

Texas InstrumentsIn Stock: 1952SN74LS14D Datasheet

DirectRFQ

SN74LS14DR

Texas InstrumentsIn Stock: 3007SN74LS14DR Datasheet

DirectRFQ

SN74LS14NSR

Texas InstrumentsIn Stock: 5050SN74LS14NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74LS14M is determined by strict equivalence across the following parameters:

• Logic Configuration: 6-channel inverter with Schmitt trigger functionality
• Electrical Specifications: Supply voltage range 4.75V–5.25V, output current ratings 400µA (high) and 8mA (low), input logic thresholds at 0.5V (low) and 1.9V (high)
• Operating Temperature Range: 0°C to 70°C
• Package Type: 14-SOIC surface mount package
• Base Product Series: 74LS14

All identified substitutes maintain these core parameters. Variations in propagation delay and packaging format (tube, cut tape, or reel) do not affect functional compatibility. The transition from obsolete to active product status in substitute parts provides improved availability and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (SN74LS14D and SN74LS14DR)

The SN74LS14D and SN74LS14DR are functionally equivalent to the DM74LS14M across all critical electrical and mechanical parameters. Both parts are manufactured by Texas Instruments, carry active product status, and comply with ROHS3 standards. The SN74LS14D is supplied in tube packaging, while the SN74LS14DR is supplied in cut tape and digi-reel format. Both maintain the standard 14-SOIC (0.154", 3.90mm width) package footprint. The improved propagation delay specification (22ns versus 33ns) represents a performance enhancement suitable for timing-critical applications.

Similar Substitute (SN74LS14NSR)

The SN74LS14NSR is functionally equivalent in logic configuration and electrical performance but uses a wider 14-SO package variant (0.209", 5.30mm width). This part is suitable for applications where the wider package footprint is acceptable or preferred. Texas Instruments active product status and ROHS3 compliance apply. The highest inventory availability (4952 units) makes this option advantageous for procurement planning.

Compliance Considerations

All Texas Instruments substitutes provide ROHS3 compliance, addressing regulatory requirements absent in the obsolete onsemi part. REACH unaffected status is consistent across all parts. Moisture sensitivity level remains at MSL 1 (unlimited) for all options.

Frequently Asked Questions (FAQ)

Q: Can SN74LS14D, SN74LS14DR, and SN74LS14NSR be used interchangeably with DM74LS14M?

A: Yes, all three Texas Instruments parts are functionally equivalent substitutes. They maintain identical logic configuration (6-channel inverter with Schmitt trigger), electrical specifications (supply voltage, output current, input logic levels), and operating temperature range. The primary differences are packaging format and package width variant in the case of SN74LS14NSR.

Q: What is the difference between SN74LS14D and SN74LS14DR?

A: Both parts are electrically identical. The difference is packaging format: SN74LS14D is supplied in tube packaging, while SN74LS14DR is supplied in cut tape and digi-reel format. Selection depends on procurement and assembly process requirements.

Q: Is the SN74LS14NSR compatible with PCB layouts designed for the standard 14-SOIC package?

A: The SN74LS14NSR uses a wider 14-SO package variant (0.209", 5.30mm width) compared to the standard 14-SOIC (0.154", 3.90mm width). PCB footprints must accommodate this wider package. Pin configuration and spacing remain compatible with the 14-pin SOIC standard, but physical board layout verification is required.

Q: What is the significance of the improved propagation delay in the Texas Instruments substitutes?

A: The Texas Instruments parts specify 22ns maximum propagation delay at 5V with 15pF load, compared to 33ns for the DM74LS14M at 5V with 50pF load. This represents faster signal switching, which is beneficial for timing-sensitive applications but does not affect functional compatibility in applications designed for the original part's timing specifications.

Q: Are all substitutes RoHS compliant?

A: The three Texas Instruments substitutes (SN74LS14D, SN74LS14DR, SN74LS14NSR) are ROHS3 compliant. The original DM74LS14M is RoHS non-compliant. This compliance improvement is relevant for applications subject to RoHS regulatory requirements.

Q: Which substitute offers the best procurement availability?

A: The SN74LS14NSR offers the highest inventory availability at 4952 units in stock, followed by SN74LS14DR at 2900 units and SN74LS14D at 1900 units. Availability should be evaluated against specific package and format requirements for your application.