CD74FCT273M Equivalent & Substitute Parts

Part Overview

The CD74FCT273M is a Flip Flop 1 Element D-Type 8 Bit Positive Edge triggered logic IC manufactured by Texas Instruments in the 74FCT series. This device functions as a master reset flip-flop with non-inverted outputs, operating at a clock frequency of 70 MHz and housed in a 20-SOIC package with 0.295" (7.50mm) width.

The CD74FCT273M is classified as obsolete. Finding equivalent and substitute parts is necessary to support legacy system maintenance, design updates, and procurement continuity where original components are no longer readily available or have been discontinued by the manufacturer.

Substiute Parts

CD74FCT273M

Texas InstrumentsIn Stock: 1701CD74FCT273M Datasheet

Current PartRFQ

CD74ACT273SM96

Texas InstrumentsIn Stock: 2168CD74ACT273SM96 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74FCT273M is determined by functional and electrical compatibility across the following critical parameters:

Functional Compatibility:

• D-Type flip-flop architecture with 1 element and 8 bits per element
• Master reset function with non-inverted outputs
• Positive edge trigger configuration

Electrical Compatibility:

• Supply voltage range overlap or compatibility (original: 4.75V ~ 5.25V)
• Clock frequency capability (original: 70 MHz minimum)
• Propagation delay performance
• Output current drive capability
• Quiescent current specifications
• Input capacitance characteristics

Physical Compatibility:

• Surface mount technology
• Package footprint and pinout alignment

The CD74ACT273SM96 qualifies as a manufacturer-recommended substitute based on matching functional architecture, compatible electrical specifications, and surface mount packaging, despite differences in package form factor (20-SSOP vs. 20-SOIC) and enhanced performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The CD74ACT273SM96 is the manufacturer-recommended substitute for the obsolete CD74FCT273M. Both devices are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement.

The substitute part offers active product status, ensuring long-term availability and supply chain stability compared to the obsolete original. The CD74ACT273SM96 operates across a wider supply voltage range (4.5V ~ 5.5V vs. 4.75V ~ 5.25V) and supports an extended operating temperature range (-55°C ~ 125°C vs. 0°C ~ 70°C), providing greater design flexibility for diverse application environments.

Package form factor differs between the two devices: the original uses 20-SOIC (0.295", 7.50mm width) while the substitute uses 20-SSOP (0.209", 5.30mm width). PCB layout and footprint modifications are required for physical integration. Both maintain identical pinout functionality for the D-Type flip-flop architecture.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT273SM96 directly replace the CD74FCT273M without PCB modifications?

A: Functional substitution is possible, but physical integration requires PCB layout changes. The 20-SSOP package footprint differs from the original 20-SOIC package. Pin functionality and electrical behavior are compatible; however, the smaller package width (5.30mm vs. 7.50mm) necessitates new PCB artwork and component placement.

Q: What are the key electrical differences between these parts?

A: The CD74ACT273SM96 provides higher clock frequency capability (85 MHz vs. 70 MHz) and wider supply voltage tolerance (4.5V ~ 5.5V vs. 4.75V ~ 5.25V). Propagation delay is longer in the substitute (14.6ns vs. 7ns at 5V, 50pF). Output current drive is more balanced in the substitute (24mA both high and low vs. 15mA high, 48mA low in the original). Operating temperature range is significantly extended (-55°C ~ 125°C vs. 0°C ~ 70°C).

Q: Is the CD74ACT273SM96 suitable for all applications using the CD74FCT273M?

A: Functional compatibility exists for D-Type flip-flop operations with master reset, positive edge triggering, and 8-bit configuration. Application suitability depends on specific timing requirements, thermal operating conditions, and PCB space constraints. The longer propagation delay and different output current characteristics must be evaluated against system timing margins and load requirements.

Q: What is the significance of the product status change from Obsolete to Active?

A: Active product status ensures manufacturer support, continued production, and reliable long-term availability. The obsolete CD74FCT273M faces supply discontinuation risk and potential price volatility. The active CD74ACT273SM96 provides procurement stability and predictable lead times for new designs and legacy system maintenance.

Q: Are both parts compliant with current regulatory standards?

A: Both the CD74FCT273M and CD74ACT273SM96 are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations for electronic component procurement and use.