CD74FCT374E Equivalent & Substitute Parts

Part Overview

The CD74FCT374E is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, designed for 8-bit positive edge-triggered applications. This component features tri-state, non-inverted outputs and operates within a 4.75V to 5.25V supply voltage range. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing system maintenance and new design implementations where legacy compatibility is required.

Substiute Parts

CD74FCT374E

Texas InstrumentsIn Stock: 1959CD74FCT374E Datasheet

Current PartRFQ

SN74AS574N

Texas InstrumentsIn Stock: 3112SN74AS574N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74FCT374E is determined by the following critical parameters:

• Functional Equivalence: D-Type flip-flop configuration with 8-bit capacity and positive edge triggering
• Output Configuration: Tri-state, non-inverted output topology
• Package Compatibility: 20-DIP (0.300", 7.62mm) through-hole mounting
• Electrical Specifications: Supply voltage range, propagation delay, output current ratings, and quiescent current
• Compliance Requirements: RoHS3 compliance and REACH unaffected status

The SN74AS574N qualifies as a substitute based on matching functional architecture, package form factor, and output type. Both components operate as single-element D-Type flip-flops with 8-bit width and tri-state non-inverted outputs in identical 20-DIP packaging.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS574N is an active-status substitute for the obsolete CD74FCT374E. Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent component selection.

The SN74AS574N provides superior clock frequency performance (90 MHz versus 70 MHz) and operates across a wider supply voltage range (4.5V ~ 5.5V versus 4.75V ~ 5.25V). Propagation delay increases from 6.6ns to 9ns, which remains acceptable for most standard logic applications. Output current ratings remain identical at 15mA high and 48mA low.

The primary electrical difference is quiescent current, which increases from 8 µA to 116 mA in the substitute. This parameter must be evaluated against specific application power consumption requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS574N directly replace the CD74FCT374E in existing designs?

A: Direct pin-compatible replacement is possible due to identical 20-DIP packaging and matching functional architecture. However, the increased quiescent current (116 mA versus 8 µA) must be evaluated for power budget compatibility. Propagation delay differences (9ns versus 6.6ns) are typically acceptable in standard logic applications but should be verified for timing-critical circuits.

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

A: The SN74AS574N operates at higher clock frequency (90 MHz versus 70 MHz) and accepts a wider supply voltage range (4.5V ~ 5.5V versus 4.75V ~ 5.25V). Quiescent current is significantly higher in the substitute. Output current ratings and trigger characteristics remain identical.

Q: Are both components RoHS compliant?

A: Yes, both the CD74FCT374E and SN74AS574N are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: What packaging considerations apply to this substitution?

A: Both components use identical 20-DIP (0.300", 7.62mm) through-hole packaging. No PCB layout modifications are required for mechanical compatibility.

Q: Why is the CD74FCT374E classified as obsolete?

A: The CD74FCT374E is no longer in active production. The SN74AS574N, with active product status and superior performance specifications, represents the current-generation equivalent for new designs and legacy system maintenance.