MM74HC273N Equivalent & Substitute Parts

Part Overview

The MM74HC273N is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit capacity and positive edge triggering. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The 74HC series provides standardized logic functionality across multiple manufacturers, enabling direct substitution based on electrical and mechanical compatibility.

Substiute Parts

MM74HC273N

onsemiIn Stock: 3180MM74HC273N Datasheet

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CD74HC273E

Texas InstrumentsIn Stock: 1266CD74HC273E Datasheet

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SN74HC273N

Texas InstrumentsIn Stock: 13560SN74HC273N Datasheet

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TC74HC273APF

Toshiba Semiconductor and StorageIn Stock: 905TC74HC273APF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM74HC273N is determined by strict adherence to the following parameters:

Critical Matching Parameters:

• Base product number: 74HC273
• Package type: 20-DIP (0.300", 7.62mm)
• Mounting type: Through Hole
• Function: D-Type flip-flop with 1 element, 8-bit capacity
• Output type: Non-Inverted
• Trigger type: Positive Edge
• Voltage supply range: 2V ~ 6V

Acceptable Variation Parameters:

• Clock frequency: 60 MHz to 78 MHz
• Max propagation delay: 23ns to 27ns @ 6V, 50pF
• Current output (high/low): 5.2mA
• Current quiescent: 4µA to 8µA
• Input capacitance: 3pF to 10pF
• Operating temperature: -40°C to 85°C minimum (extended ranges acceptable)

All substitute parts listed maintain identical functional specifications and package dimensions, ensuring direct pin-for-pin compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Active Production Designs: Select from CD74HC273E, SN74HC273N, or TC74HC273APF. All three are active products with current manufacturing status and full compliance certifications (ROHS3, REACH Unaffected). SN74HC273N offers the highest inventory availability (13,452 pcs) and maintains the same operating temperature range as the original MM74HC273N.

For Extended Temperature Range Requirements: CD74HC273E supports -55°C to 125°C operating temperature, exceeding the original specification of -40°C to 85°C.

For Low Power Applications: TC74HC273APF provides reduced quiescent current (4 µA versus 8 µA), offering power efficiency benefits in battery-powered or low-power designs.

For Timing-Critical Applications: MM74HC273N and TC74HC273APF both provide superior propagation delay performance (23ns and 25ns respectively) compared to CD74HC273E and SN74HC273N (26ns and 27ns).

All substitute parts maintain identical pin configuration, package dimensions, and functional specifications, ensuring direct replacement capability without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can MM74HC273N be directly replaced with any of the listed substitutes? A: Yes. All listed parts share identical package type (20-DIP), pin configuration, and functional specifications. Direct pin-for-pin substitution is supported without circuit modification.

Q: What is the primary reason for finding substitutes for MM74HC273N? A: The MM74HC273N is classified as obsolete. Active alternatives from Texas Instruments and Toshiba ensure continued design support and procurement availability.

Q: Are there differences in electrical performance between substitutes? A: Minor variations exist within acceptable ranges. Clock frequency ranges from 60 MHz to 78 MHz, propagation delay from 23ns to 27ns, and quiescent current from 4µA to 8µA. All variations remain within the 74HC273 specification envelope and do not affect functional compatibility.

Q: Which substitute offers the best compliance profile? A: CD74HC273E, SN74HC273N, and TC74HC273APF all carry ROHS3 compliance and REACH Unaffected status. The original MM74HC273N does not specify RoHS compliance.

Q: Does package type vary among substitutes? A: No. All parts use identical 20-DIP (0.300", 7.62mm) through-hole packaging. PCB layout and socket compatibility remain unchanged.

Q: What is the inventory status of each substitute? A: SN74HC273N: 13,452 pcs; CD74HC273E: 1,175 pcs; TC74HC273APF: 855 pcs. Availability varies by supplier and region.

Q: Can substitutes be used interchangeably in existing designs? A: Yes. Electrical and mechanical specifications are compatible. No design changes are required for substitution.