CD74HCT377M Equivalent & Substitute Parts

Part Overview

The CD74HCT377M is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, configured as a single element with 8-bit parallel data storage capability. This device operates as a standard positive-edge-triggered flip-flop in the 74HCT logic family, housed in a 20-SOIC surface mount package.

The CD74HCT377M is currently designated as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements for applications utilizing this component.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD74HCT377M
Manufacturer	Texas Instruments
Logic Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	8
Clock Frequency	50 MHz
Max Propagation Delay	38 ns @ 4.5V, 50pF
Trigger Type	Positive Edge
Output Type	Non-Inverted
Current - Output High/Low	4 mA / 4 mA
Voltage Supply Range	4.5V ~ 5.5V
Current - Quiescent	8 µA
Operating Temperature	-55°C ~ 125°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the CD74HCT377M are identified based on strict electrical and mechanical compatibility criteria. The following parameters determine valid substitution:

Primary Substitution Criteria:

Logic function: D-Type flip-flop with 8-bit parallel storage
Number of elements: 1
Number of bits per element: 8
Trigger type: Positive edge
Output type: Non-inverted (or tri-state non-inverted)
Package type: 20-SOIC surface mount
Voltage supply range: 4.5V ~ 5.5V
Operating temperature range: Minimum -40°C to -55°C; Maximum 125°C

Secondary Compatibility Parameters:

Clock frequency: 30 MHz minimum
Propagation delay: 38 ns or better
Output current capability: 4 mA minimum
RoHS compliance status

Substitutes are grouped by product status (Active, Obsolete, Last Time Buy) and packaging format (Tube, Tape & Reel, Bulk). Electrical performance parameters must meet or exceed the original specification to ensure functional equivalence.

Parameter Comparison

Parameter	CD74HCT377M	CD74HCT377M96	74HCT377D,652	74HCT377D,653	74HCT377D-Q100J	MC74HCT574ADWR2G
Manufacturer	Texas Instruments	Texas Instruments	Nexperia USA Inc.	NXP USA Inc.	Nexperia USA Inc.	onsemi
Product Status	Last Time Buy	Active	Obsolete	Active	Active	Active
Packaging	Tube	Tape & Reel	Tube	Bulk	Tape & Reel	Tape & Reel
Number of Bits	8	8	8	8	8	8
Clock Frequency	50 MHz	50 MHz	53 MHz	53 MHz	53 MHz	30 MHz
Max Propagation Delay	38 ns @ 4.5V, 50pF	38 ns @ 4.5V, 50pF	32 ns @ 4.5V, 50pF	32 ns @ 4.5V, 50pF	32 ns @ 4.5V, 50pF	30 ns @ 5V, 50pF
Output Type	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Tri-State, Non-Inverted
Current - Output High/Low	4 mA / 4 mA	4 mA / 4 mA	4 mA / 5.2 mA	4 mA / 5.2 mA	4 mA / 5.2 mA	6 mA / 6 mA
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent	8 µA	8 µA	8 µA	8 µA	8 µA	4 µA
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

Primary Recommendation: CD74HCT377M96

The CD74HCT377M96 is the direct functional equivalent manufactured by Texas Instruments with Active product status. This part maintains identical electrical specifications, operating temperature range (-55°C ~ 125°C), and packaging (20-SOIC). The only difference is packaging format (Tape & Reel versus Tube), which does not affect electrical performance. This is the preferred substitute for new designs and ongoing production.

Secondary Recommendations: 74HCT377D,653 and 74HCT377D-Q100J

Both parts are manufactured by Nexperia/NXP USA Inc. and maintain Active product status. These devices feature improved propagation delay (32 ns versus 38 ns) and higher clock frequency (53 MHz versus 50 MHz), providing superior electrical performance. Operating temperature range is reduced to -40°C ~ 125°C. The 74HCT377D-Q100J includes AEC-Q100 automotive qualification, suitable for automotive-grade applications.

Alternative Option: MC74HCT574ADWR2G

The MC74HCT574ADWR2G, manufactured by onsemi, provides tri-state output capability in addition to non-inverted output. This part offers lower quiescent current (4 µA versus 8 µA) and improved propagation delay (30 ns). However, the reduced clock frequency (30 MHz) and higher moisture sensitivity level (MSL 3) require evaluation against specific application requirements. This substitute is suitable only when tri-state output functionality is required or beneficial.

Not Recommended: 74HCT377D,652

The 74HCT377D,652 is designated Obsolete and should not be selected for new designs or long-term production planning.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT377M96 be used as a direct replacement for CD74HCT377M?

A: Yes. CD74HCT377M96 is electrically and functionally identical to CD74HCT377M. Both are manufactured by Texas Instruments with identical specifications for clock frequency, propagation delay, output current, and operating temperature range. The difference is packaging format: CD74HCT377M is supplied in Tube, while CD74HCT377M96 is supplied in Tape & Reel. Both are RoHS3 compliant with MSL 1 rating.

Q: What is the difference between the Nexperia parts (74HCT377D,653 and 74HCT377D-Q100J) and the original CD74HCT377M?

A: The Nexperia parts offer improved electrical performance with faster propagation delay (32 ns versus 38 ns) and higher clock frequency (53 MHz versus 50 MHz). However, the operating temperature range is narrower (-40°C ~ 125°C versus -55°C ~ 125°C). The 74HCT377D-Q100J includes AEC-Q100 automotive qualification. Both parts are functionally compatible with identical 8-bit D-type flip-flop architecture and 20-SOIC packaging.

Q: Why is MC74HCT574ADWR2G listed as a substitute if it has different output characteristics?

A: MC74HCT574ADWR2G is functionally compatible because it maintains the core D-type flip-flop architecture with 8-bit storage and positive-edge triggering in the same 20-SOIC package. The tri-state output is an additional feature that does not prevent substitution in applications requiring standard non-inverted output. However, tri-state output control pins must be managed appropriately in the circuit design.

Q: What does MSL 3 (168 Hours) mean for MC74HCT574ADWR2G?

A: Moisture Sensitivity Level 3 indicates the component requires controlled storage conditions and has a limited shelf life of 168 hours after exposure to moisture. This contrasts with MSL 1 (Unlimited) for other substitutes, which have no moisture sensitivity restrictions. MSL 3 components require proper handling, storage in dry conditions, and may require baking before reflow soldering.

Q: Can I use 74HCT377D,652 in production?

A: No. The 74HCT377D,652 is designated Obsolete and should not be selected for new designs or ongoing production. Use CD74HCT377M96, 74HCT377D,653, or 74HCT377D-Q100J instead.

Q: Are all substitute parts RoHS3 compliant?

A: Five of the six substitutes are explicitly RoHS3 compliant. The 74HCT377D,653 does not specify RoHS status in the provided data. Verify RoHS compliance status with the manufacturer if this certification is required for your application.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging supplies components in plastic tubes suitable for manual handling and small-quantity orders. Tape & Reel packaging supplies components on continuous carrier tape wound on reels, optimized for automated assembly equipment and high-volume production. Electrical performance is identical; packaging choice depends on manufacturing process and order volume requirements.

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