DM74LS273WM Equivalent & Substitute Parts

Part Overview

The DM74LS273WM is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit capacity and positive edge triggering. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, redesign, and procurement continuity. The 20-SOIC surface mount package and master reset function define its core application scope in digital logic circuits requiring synchronized data storage and control.

Substiute Parts

DM74LS273WM

onsemiIn Stock: 1204DM74LS273WM Datasheet

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CD74FCT273M

Harris CorporationIn Stock: 7284CD74FCT273M Datasheet

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CY74FCT273CTSOC

Texas InstrumentsIn Stock: 3421CY74FCT273CTSOC Datasheet

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SN74ABT273DWR

Texas InstrumentsIn Stock: 8569SN74ABT273DWR Datasheet

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SN74LS273DWR

Texas InstrumentsIn Stock: 3092SN74LS273DWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DM74LS273WM is determined by the following mandatory parameters:

• Identical package type: 20-SOIC (0.295", 7.50mm Width)
• Identical function: D-Type flip-flop with master reset
• Identical bit configuration: 1 element, 8 bits per element
• Identical trigger type: Positive edge
• Identical output type: Non-inverted
• Compatible supply voltage range: 4.75V ~ 5.25V minimum overlap
• Surface mount mounting type
• Identical HTSUS classification: 8542.39.0001

The four substitute parts listed below meet all mandatory substitution criteria. Differences in clock frequency, propagation delay, output current, quiescent current, and operating temperature range represent performance variations within the same functional category and do not disqualify substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

SN74LS273DWR (Texas Instruments) is the primary substitute for direct replacement. It maintains identical electrical specifications to the DM74LS273WM, including supply voltage range, output current characteristics, and operating temperature. Active product status ensures long-term availability. ROHS3 compliance supports modern procurement requirements.

CY74FCT273CTSOC (Texas Instruments) is suitable for applications requiring extended operating temperature range (-40°C to 85°C) and higher clock frequency performance (70 MHz). Active product status and ROHS3 compliance are present. This substitute introduces higher output current capability and lower propagation delay, appropriate for performance-critical designs.

SN74ABT273DWR (Texas Instruments) provides the highest clock frequency (150 MHz) and extended temperature range (-40°C to 85°C). Active product status and ROHS3 compliance are confirmed. The expanded supply voltage range (4.5V ~ 5.5V) offers additional design flexibility. This substitute is optimal for high-speed applications.

CD74FCT273M (Harris Corporation) is an obsolete substitute with 70 MHz clock frequency capability. RoHS non-compliance and obsolete status limit its suitability for new designs. This part is applicable only for legacy system maintenance where existing inventory exists.

Frequently Asked Questions (FAQ)

Q: Can SN74LS273DWR directly replace DM74LS273WM without circuit modification?

A: Yes. SN74LS273DWR maintains identical electrical specifications, package type, and functional characteristics. No circuit modification is required for direct substitution.

Q: What is the primary difference between 74LS, 74FCT, and 74ABT series substitutes?

A: Series designation indicates logic family technology. 74LS represents low-power Schottky logic with 30-40 MHz performance. 74FCT represents fast CMOS technology with 70 MHz capability. 74ABT represents advanced BiCMOS technology with 150 MHz performance. All three families are functionally compatible within the specified parameters.

Q: Are there temperature range limitations when substituting with CY74FCT273CTSOC or SN74ABT273DWR?

A: No. These substitutes feature extended operating temperature ranges (-40°C to 85°C) that encompass the original DM74LS273WM range (0°C to 70°C). Extended range capability does not create compatibility issues.

Q: Does RoHS compliance affect substitution eligibility?

A: RoHS compliance is a regulatory and procurement consideration, not a functional substitution criterion. ROHS3-compliant substitutes (SN74LS273DWR, CY74FCT273CTSOC, SN74ABT273DWR) are preferred for modern applications. CD74FCT273M, being RoHS non-compliant, is restricted to legacy maintenance scenarios.

Q: Can higher clock frequency substitutes introduce timing issues in existing circuits?

A: No. Higher clock frequency capability indicates faster operation potential, not mandatory operation at higher speeds. Circuits designed for 30 MHz operation function correctly with 70 MHz or 150 MHz capable substitutes operating at original clock frequencies.

Q: Is the 20-SOIC package identical across all substitute parts?

A: Yes. All substitute parts use the identical 20-SOIC (0.295", 7.50mm Width) package. PCB footprint, pin assignment, and mechanical fit are identical. No layout modification is required.

Q: What is the significance of MSL (Moisture Sensitivity Level) rating?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed substitutes with specified MSL ratings carry MSL 1 classification, ensuring equivalent storage and handling requirements.