74ACT273MTC Equivalent & Substitute Parts

Part Overview

The 74ACT273MTC is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit configuration and positive edge triggering. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The part operates within the 74ACT logic family standard, with a 20-TSSOP surface mount package measuring 0.173" × 4.40mm width.

Substiute Parts

74ACT273MTC

onsemiIn Stock: 774574ACT273MTC Datasheet

Current PartRFQ

MC74ACT273DTR2G

onsemiIn Stock: 9875MC74ACT273DTR2G Datasheet

DirectRFQ

CD74ACT273PWR

Texas InstrumentsIn Stock: 17179CD74ACT273PWR Datasheet

SimilarRFQ

CD74ACT273SM96

Texas InstrumentsIn Stock: 2168CD74ACT273SM96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT273MTC is determined by the following critical parameters:

Core Functional Requirements:

• Logic family: 74ACT series
• Type: D-Type flip-flop
• Number of elements: 1
• Bits per element: 8
• Function: Master Reset
• Output type: Non-Inverted
• Trigger type: Positive Edge

Electrical Compatibility:

• Voltage supply range: 4.5V ~ 5.5V
• Output current capability: 24mA (high and low)
• Operating temperature range: -40°C minimum to 85°C maximum

Physical Compatibility:

• Package type: 20-pin surface mount
• Pin configuration: TSSOP or SSOP variants

Substitute parts are grouped into two categories: direct equivalents (identical package and specifications) and compatible alternatives (same functionality with package or performance variations).

Parameter Comparison

Engineering Selection Recommendations

MC74ACT273DTR2G (onsemi) - Direct Equivalent

This part is the primary substitute for the 74ACT273MTC. It maintains identical package geometry (20-TSSOP), electrical specifications, and operating temperature range. The MC74ACT273DTR2G is actively manufactured and ROHS3 compliant, providing long-term availability and regulatory compliance. Quiescent current is reduced to 8 µA compared to the original 40 µA, representing improved power efficiency. Clock frequency is rated at 200 MHz, exceeding the original 189 MHz specification. Propagation delay increases marginally to 11ns from 8.5ns, remaining within acceptable timing margins for most applications. This part is supplied in Tape & Reel packaging format.

CD74ACT273PWR (Texas Instruments) - Compatible Alternative

This Texas Instruments part provides functional equivalence with identical package dimensions (20-TSSOP) and electrical output characteristics. It is actively manufactured and ROHS3 compliant. The operating temperature range extends to -55°C to 125°C, providing broader environmental coverage than the original specification. Clock frequency is rated at 85 MHz, which is lower than the original part. Propagation delay is 14.6ns, representing a 58% increase from the original 8.5ns specification. Input capacitance increases to 10 pF from 4.5 pF. These parameter variations require evaluation against specific application timing requirements.

CD74ACT273SM96 (Texas Instruments) - Package Variant

This part is functionally equivalent but uses a 20-SSOP package (0.209" × 5.30mm width) instead of the 20-TSSOP package. The SSOP package is physically larger and requires PCB layout modification. Electrical specifications and operating temperature range match the CD74ACT273PWR variant. This option is suitable only when PCB redesign is acceptable or when SSOP package availability is preferred.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT273DTR2G be used as a direct replacement for 74ACT273MTC without PCB modification?

A: Yes. The MC74ACT273DTR2G maintains identical pin configuration, package dimensions (20-TSSOP), and electrical specifications within the original operating parameters. No PCB layout changes are required.

Q: What are the timing implications of using CD74ACT273PWR as a substitute?

A: The CD74ACT273PWR has a maximum propagation delay of 14.6ns at 5V with 50pF load, compared to 8.5ns for the original part. This 5ns increase must be evaluated against circuit timing margins. If the original design operated with minimal timing slack, this substitute may not be suitable without circuit redesign.

Q: Are all substitute parts RoHS compliant?

A: Yes. MC74ACT273DTR2G, CD74ACT273PWR, and CD74ACT273SM96 are all ROHS3 compliant. The original 74ACT273MTC does not specify RoHS status.

Q: What is the difference between CD74ACT273PWR and CD74ACT273SM96?

A: Both parts are functionally identical with matching electrical specifications. The primary difference is package type: CD74ACT273PWR uses 20-TSSOP (0.173" width), while CD74ACT273SM96 uses 20-SSOP (0.209" width). The SSOP package is physically larger and requires PCB redesign if substituted.

Q: Does the reduced quiescent current in MC74ACT273DTR2G affect circuit operation?

A: No. The reduction from 40 µA to 8 µA represents improved power efficiency and does not affect functional operation. This change is beneficial for power-sensitive applications.

Q: What is the moisture sensitivity level for all substitute parts?

A: All substitute parts, including the original 74ACT273MTC, have MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Can CD74ACT273SM96 be used if PCB space is constrained?

A: No. The CD74ACT273SM96 SSOP package (0.209" width) is larger than the TSSOP package (0.173" width) used by the original part and other direct substitutes. It requires additional PCB space and layout modification.