CD74HCT273M Equivalent & Substitute Parts

Part Overview

The CD74HCT273M is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit parallel data storage capability in a 20-SOIC surface mount package. This device is classified as discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement.

The 74HCT273 base product family provides master reset functionality with positive edge triggering, operating across the 4.5V to 5.5V supply range. Substitute parts maintain functional equivalence while offering different manufacturer sources, packaging options, and in some cases enhanced electrical performance characteristics.

Substiute Parts

CD74HCT273M

Texas InstrumentsIn Stock: 1447CD74HCT273M Datasheet

Current PartRFQ

CD74HCT273M96

Texas InstrumentsIn Stock: 1975CD74HCT273M96 Datasheet

DirectRFQ

74HCT273D-Q100J

Nexperia USA Inc.In Stock: 95574HCT273D-Q100J Datasheet

DirectRFQ

74HCT273D,652

NXP SemiconductorsIn Stock: 2560174HCT273D,652 Datasheet

MFR RecommendedRFQ

74HCT273D,653

NXP SemiconductorsIn Stock: 30030174HCT273D,653 Datasheet

MFR RecommendedRFQ

74HCT273D/AUJ

NXP USA Inc.In Stock: 104374HCT273D/AUJ Datasheet

MFR RecommendedRFQ

MC74AC273DWR2G

onsemiIn Stock: 2843MC74AC273DWR2G Datasheet

MFR RecommendedRFQ

MC74HCT273ADWG

onsemiIn Stock: 2415MC74HCT273ADWG Datasheet

MFR RecommendedRFQ

MC74HCT273ADWR2G

onsemiIn Stock: 1735MC74HCT273ADWR2G Datasheet

MFR RecommendedRFQ

MM74HCT273WM

Fairchild SemiconductorIn Stock: 1497MM74HCT273WM Datasheet

MFR RecommendedRFQ

MM74HCT273WMX

Fairchild SemiconductorIn Stock: 1822MM74HCT273WMX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HCT273M is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Package / Case: 20-SOIC (0.295", 7.50mm Width) — physical and electrical pin compatibility
• Type: D-Type Flip Flop, 1 Element, 8 Bit — functional architecture
• Voltage - Supply: 4.5V ~ 5.5V — operating voltage range
• Trigger Type: Positive Edge — clocking behavior
• Output Type: Non-Inverted — logic polarity

Performance Parameters (Allowable Variation):

• Clock Frequency: Substitute must meet or exceed 50 MHz minimum
• Max Propagation Delay: Substitute must meet or be faster than 30ns @ 4.5V, 50pF
• Current - Output High, Low: Substitute must provide equal or greater drive capability
• Operating Temperature: Substitute range must encompass or exceed -55°C ~ 125°C
• Current - Quiescent (Iq): Substitute must not exceed 8 µA significantly

All substitute parts listed maintain the 20-SOIC package footprint and core D-type flip-flop architecture. Variations in clock frequency, propagation delay, and temperature range reflect different manufacturer implementations within the 74HCT273 logic family.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance):

CD74HCT273M96 is the primary direct substitute, manufactured by Texas Instruments with identical electrical specifications and operating parameters. This part maintains the same 50 MHz clock frequency, 30ns propagation delay, and -55°C to 125°C temperature range. The difference is packaging format: available in Cut Tape (CT) & Digi-Reel® instead of Tube, with active product status and higher inventory availability (1900 pcs vs. 1343 pcs).

74HCT Series Alternatives (NXP/Nexperia):

74HCT273D-Q100J (Nexperia), 74HCT273D,652, 74HCT273D,653, and 74HCT273D/AUJ (NXP) are functionally compatible substitutes. These parts operate within the same 4.5V to 5.5V supply range and maintain 30ns propagation delay. Clock frequency is reduced to 36 MHz, which remains above typical application requirements. All are active products with substantial inventory. The 74HCT273D-Q100J carries AEC-Q100 automotive qualification. NXP variants offer the highest inventory availability (25,520 to 300,200 pcs).

74HCT Series from onsemi:

MC74HCT273ADWG and MC74HCT273ADWR2G maintain full compatibility with the original CD74HCT273M across all critical parameters, including the -55°C to 125°C temperature range. These parts feature 30 MHz clock frequency and 25ns propagation delay at 5V. Both are active products with ROHS3 compliance and MSL 3 rating. Packaging options include Tube (ADWG) and Tape & Reel (ADWR2G).

74HCT Series from Fairchild Semiconductor:

MM74HCT273WM and MM74HCT273WMX offer enhanced clock frequency (68 MHz) and higher output drive capability (4.8mA vs. 4mA). Operating temperature range is limited to -40°C to 85°C. These parts are suitable for applications not requiring the extended -55°C lower temperature specification.

Performance-Enhanced Alternative (74AC Series):

MC74AC273DWR2G from onsemi represents a performance upgrade within the same package. This 74AC variant provides 175 MHz clock frequency, 9ns propagation delay, and 24mA output drive capability. Supply voltage range expands to 2V to 6V. Operating temperature is -40°C to 85°C. This part is appropriate for applications requiring higher speed performance and is not a direct functional replacement due to different electrical characteristics.

Frequently Asked Questions (FAQ)

Q: Can I use CD74HCT273M96 as a direct replacement for CD74HCT273M?

A: Yes. CD74HCT273M96 is manufactured by Texas Instruments with identical electrical specifications, including 50 MHz clock frequency, 30ns propagation delay, and -55°C to 125°C operating temperature. The only difference is packaging format (Cut Tape & Digi-Reel® vs. Tube). Pin configuration and functional behavior are identical.

Q: What is the difference between 74HCT and 74AC series parts?

A: The 74HCT series operates at 4.5V to 5.5V with lower power consumption and moderate speed (30-50 MHz typical). The 74AC series operates at 2V to 6V with higher speed capability (175 MHz) and greater output drive current (24mA vs. 4mA). The MC74AC273DWR2G is not a direct functional replacement; it is a performance upgrade for applications requiring higher speed.

Q: Are all substitute parts ROHS3 compliant?

A: Most substitute parts listed carry ROHS3 compliance. Verify specific compliance documentation for your application requirements, particularly for regulated industries.

Q: Can I use parts with reduced operating temperature range (-40°C to 85°C instead of -55°C to 125°C)?

A: Only if your application operates within the -40°C to 85°C range. Parts such as MM74HCT273WM and MM74HCT273WMX have this reduced range. For applications requiring -55°C operation, use CD74HCT273M96, MC74HCT273ADWG, MC74HCT273ADWR2G, or 74HCT273D-Q100J.

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

A: MSL 1 (unlimited) indicates the part has no moisture sensitivity restrictions and requires no special handling or baking procedures. MSL 3 (168 hours) requires controlled storage and handling to prevent moisture absorption. For standard applications, both ratings are acceptable; verify requirements for high-reliability or military applications.

Q: Which substitute offers the best inventory availability?

A: 74HCT273D,653 from NXP Semiconductors has the highest inventory (300,200 pcs), followed by 74HCT273D,652 (25,520 pcs). Both are active products with bulk packaging options.

Q: Are automotive-qualified versions available?

A: Yes. 74HCT273D-Q100J from Nexperia carries AEC-Q100 automotive qualification, suitable for automotive and harsh environment applications.