74AC377MTC Equivalent & Substitute Parts

Part Overview

The 74AC377MTC 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, which necessitates identification of active equivalent alternatives for ongoing design and procurement requirements. The part operates across a supply voltage range of 2V to 6V with a maximum propagation delay of 9ns at 5V with 50pF load.

Substiute Parts

74AC377MTC

onsemiIn Stock: 89074AC377MTC Datasheet

Current PartRFQ

MC74AC377DTR2G

onsemiIn Stock: 3640MC74AC377DTR2G Datasheet

DirectRFQ

MC74AC377DTG

onsemiIn Stock: 782MC74AC377DTG Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC377MTC is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

• Base product number: 74AC377
• Logic function: D-Type flip-flop, 1 element, 8-bit configuration
• Trigger mechanism: Positive edge triggering
• Output configuration: Non-inverted
• Package type: 20-TSSOP (0.173", 4.40mm Width)
• Mounting method: Surface mount
• Supply voltage range: 2V ~ 6V
• Operating temperature range: -40°C ~ 85°C

Allowable Parameter Variations:

• Clock frequency: Substitute parts may operate at lower maximum frequencies (140 MHz vs. 175 MHz) while maintaining functional compatibility
• Propagation delay: Substitute parts may exhibit slightly higher propagation delays (10ns vs. 9ns at 5V, 50pF) within acceptable timing margins
• Quiescent current: Substitute parts may demonstrate lower quiescent current consumption (8 µA vs. 40 µA), representing improved power efficiency
• Packaging format: Substitutes may differ in supplier packaging (Tape & Reel or Tube) without affecting electrical performance
• Product status: Active alternatives replace the obsolete main part

Parameter Comparison

Engineering Selection Recommendations

MC74AC377DTR2G is the primary direct substitute for 74AC377MTC. This part maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. The Tape & Reel packaging format supports automated assembly processes. Quiescent current reduction to 8 µA provides improved power efficiency in battery-powered or low-power applications without compromising functional performance.

MC74AC377DTG serves as an alternative substitute with identical electrical characteristics to MC74AC377DTR2G. This part is supplied in Tube packaging, suitable for manual assembly or lower-volume procurement scenarios. Selection between MC74AC377DTR2G and MC74AC377DTG depends on assembly methodology and packaging requirements rather than electrical performance.

Both substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The 1ns increase in maximum propagation delay (10ns vs. 9ns) and 35 MHz reduction in clock frequency (140 MHz vs. 175 MHz) remain within acceptable operational margins for standard logic applications utilizing the 74AC377 series.

Frequently Asked Questions (FAQ)

Q: Can MC74AC377DTR2G directly replace 74AC377MTC in existing designs?

A: Yes. Both parts share identical logic function, pin configuration, package type (20-TSSOP), and electrical operating parameters including supply voltage range (2V ~ 6V), output drive capability (24mA), and operating temperature range (-40°C ~ 85°C). The 1ns propagation delay difference and 35 MHz clock frequency reduction do not affect functional compatibility in standard logic applications.

Q: What is the difference between MC74AC377DTR2G and MC74AC377DTG?

A: The primary difference is packaging format. MC74AC377DTR2G is supplied in Tape & Reel format for automated pick-and-place assembly, while MC74AC377DTG is supplied in Tube format for manual handling. Electrical specifications and performance characteristics are identical between both parts.

Q: Why does the substitute part have lower quiescent current?

A: MC74AC377DTR2G and MC74AC377DTG feature improved power efficiency with quiescent current of 8 µA compared to 40 µA in the obsolete 74AC377MTC. This represents a manufacturing improvement in the active product line and does not indicate reduced functionality or performance degradation.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both MC74AC377DTR2G and MC74AC377DTG are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

Q: Can I use these parts interchangeably in my PCB design?

A: Yes. All three parts utilize the identical 20-TSSOP (0.173", 4.40mm Width) package with surface mount configuration. PCB footprints, solder pad layouts, and component placement are fully compatible across all variants.