CD74HC273M Equivalent & Substitute Parts

Part Overview

The CD74HC273M is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit capacity and positive edge triggering. The device is packaged in 20-SOIC (0.295", 7.50mm Width) surface mount configuration. This part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD74HC273M
Manufacturer	Texas Instruments
Series	74HC
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Clock Frequency	60 MHz
Max Propagation Delay @ 6V, 50pF	26 ns
Voltage Supply Range	2V ~ 6V
Current Output High/Low	5.2 mA / 5.2 mA
Quiescent Current (Iq)	8 µA
Input Capacitance	10 pF
Operating Temperature Range	-55°C ~ 125°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HC273M is determined by the following critical parameters:

Functional Type: D-Type flip-flop with 1 element, 8-bit configuration, positive edge trigger
Package Compatibility: 20-SOIC (0.295", 7.50mm Width) surface mount only
Voltage Supply Range: 2V ~ 6V minimum requirement
Output Type: Non-inverted output configuration
Electrical Characteristics: Clock frequency, propagation delay, output current, and quiescent current within acceptable operational margins

Substitute parts are grouped into two categories:

Category 1 - Direct 74HC Series Substitutes: Parts maintaining identical or superior electrical performance within the 74HC logic family, with active product status and full compliance certifications.

Category 2 - 74AC Series Alternative: Higher-performance variant offering improved speed characteristics, suitable for applications requiring enhanced clock frequency and reduced propagation delay, with trade-offs in output current and temperature range.

Parameter Comparison

Part Number	Manufacturer	Series	Clock Frequency (MHz)	Max Propagation Delay @ 6V, 50pF (ns)	Output Current High/Low (mA)	Quiescent Current (µA)	Input Capacitance (pF)	Operating Temperature (°C)	Product Status
CD74HC273M	Texas Instruments	74HC	60	26	5.2 / 5.2	8	10	-55 ~ 125	Discontinued
CD74HC273M96	Texas Instruments	74HC	60	26	5.2 / 5.2	8	10	-55 ~ 125	Active
MM74HC273WM	Fairchild Semiconductor	74HC	78	23	5.2 / 5.2	8	7	-40 ~ 85	Active
74HC273D,653	Nexperia USA Inc.	74HC	122	26	5.2 / 5.2	8	4.6	-40 ~ 125	Active
MC74AC273DWR2G	onsemi	74AC	175	9	24 / 24	8	4.5	-40 ~ 85	Active
MC74HC273ADWG	onsemi	74HC	35	25	7.8 / 7.8	4	10	-55 ~ 125	Active
MC74HC273ADWR2G	onsemi	74HC	35	25	7.8 / 7.8	4	10	-55 ~ 125	Active
MM74HC273WMX	Fairchild Semiconductor	74HC	78	23	5.2 / 5.2	8	7	-40 ~ 85	Active

Engineering Selection Recommendations

Primary Recommendation - CD74HC273M96 (Texas Instruments)

CD74HC273M96 is the direct functional equivalent with identical electrical specifications and maintains the same manufacturer lineage. This part is active and available in higher inventory quantities (1462 pcs). It carries ROHS3 compliance and MSL 1 rating, matching the original part's environmental specifications. Packaging is available in Cut Tape and Digi-Reel formats for production flexibility.

Secondary Recommendation - 74HC273D,653 (Nexperia USA Inc.)

This Nexperia part offers superior clock frequency performance (122 MHz vs. 60 MHz) and reduced input capacitance (4.6 pF vs. 10 pF), providing enhanced speed margins. Operating temperature range extends to -40°C ~ 125°C. ROHS3 compliant with MSL 1 rating. Suitable for applications requiring improved timing performance within the 74HC family.

Alternative for High-Speed Applications - MC74AC273DWR2G (onsemi)

The 74AC series variant provides significantly improved performance with 175 MHz clock frequency and 9 ns propagation delay. Output current capability increases to 24 mA. This part is recommended only when the original design can accommodate the 74AC series characteristics and the reduced operating temperature range (-40°C ~ 85°C). MSL 3 rating requires controlled moisture handling.

Extended Temperature Range Option - MC74HC273ADWG / MC74HC273ADWR2G (onsemi)

Both onsemi variants maintain -55°C ~ 125°C operating range matching the original part. These are suitable for applications requiring extended low-temperature operation. Available in Tube and Cut Tape packaging. MSL 3 rating applies.

Frequently Asked Questions (FAQ)

Q: Can CD74HC273M96 be used as a direct replacement for CD74HC273M?

A: Yes. CD74HC273M96 is electrically and functionally identical to CD74HC273M, with matching clock frequency (60 MHz), propagation delay (26 ns), output current (5.2 mA), and operating temperature range (-55°C ~ 125°C). The primary difference is product status (active vs. discontinued) and packaging format availability.

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

A: The 74AC series (MC74AC273DWR2G) offers higher clock frequency (175 MHz vs. 60 MHz) and faster propagation delay (9 ns vs. 26 ns), with increased output current (24 mA vs. 5.2 mA). However, the operating temperature range is reduced to -40°C ~ 85°C. Use 74AC only if your design specifications permit the narrower temperature range and can handle the higher output current characteristics.

Q: Are all substitute parts available in 20-SOIC packaging?

A: Yes. All listed substitute parts are packaged in 20-SOIC (0.295", 7.50mm Width) surface mount configuration, maintaining mechanical and electrical compatibility with the original CD74HC273M footprint.

Q: What does MSL rating mean for component selection?

A: Moisture Sensitivity Level (MSL) indicates moisture handling requirements during storage and assembly. MSL 1 (unlimited) requires no special moisture control. MSL 3 (168 hours) requires controlled humidity storage and has a 168-hour floor life after opening. CD74HC273M96 carries MSL 1, while onsemi variants carry MSL 3.

Q: Which substitute offers the best performance upgrade?

A: The 74HC273D,653 from Nexperia provides the best performance upgrade within the 74HC family, with 122 MHz clock frequency and 4.6 pF input capacitance, while maintaining full compatibility with the original operating temperature range and compliance certifications.

Q: Can I use MM74HC273WM or MM74HC273WMX in applications requiring -55°C operation?

A: No. Both Fairchild variants operate only to -40°C minimum. Use these parts only in applications with -40°C ~ 85°C temperature requirements. For extended low-temperature operation, select CD74HC273M96, 74HC273D,653, or onsemi variants with -55°C rating.

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