54FCT574ATLB Equivalent & Substitute Parts

Part Overview

The 54FCT574ATLB is an octal edge-triggered D-type flip-flop manufactured by Renesas Electronics Corporation, designed for high-speed logic applications requiring positive edge-triggered data capture and tri-state output control. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The part operates across military-grade temperature ranges (-55°C to 125°C) and is housed in a 20-LCC surface mount package.

Substiute Parts

54FCT574ATLB

Renesas Electronics CorporationIn Stock: 119554FCT574ATLB Datasheet

Current PartRFQ

CY54FCT574ATLMB

Texas InstrumentsIn Stock: 1005CY54FCT574ATLMB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 54FCT574ATLB is determined by strict equivalence across the following critical parameters:

• Logic Function: D-type flip-flop with 8-bit capacity, single element configuration
• Trigger Mechanism: Positive edge-triggered operation
• Output Configuration: Tri-state output capability
• Electrical Performance: Maximum propagation delay of 7.2ns at 50pF load
• Supply Voltage Range: 4.5V to 5.5V operation
• Temperature Range: -55°C to 125°C operating specification
• Package Compatibility: 20-pin LCC or CLCC surface mount housing with 8.89x8.89mm footprint dimensions

The CY54FCT574ATLMB from Texas Instruments meets all substitution criteria within these defined parameters.

Parameter Comparison

Engineering Selection Recommendations

The CY54FCT574ATLMB is a direct functional substitute for the 54FCT574ATLB based on matching logic specifications, electrical performance, and package footprint. The Texas Instruments part offers the additional advantage of active product status, ensuring continued availability and manufacturing support.

The CY54FCT574ATLMB demonstrates improved power efficiency with quiescent current of 200 µA compared to 1 mA in the original part, and reduced output drive currents (12mA/32mA versus 15mA/48mA). These differences remain within acceptable operating margins for standard logic applications and do not compromise functional compatibility.

The CY54FCT574ATLMB carries RoHS3 compliance status, whereas the original 54FCT574ATLB is RoHS non-compliant. This distinction is relevant for applications subject to environmental or regulatory requirements.

Both parts maintain identical package footprints (8.89x8.89mm) and pinout configurations, enabling direct board-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the CY54FCT574ATLMB replace the 54FCT574ATLB in existing designs?

A: Yes. Both parts share identical logic function, trigger mechanism, output configuration, propagation delay specifications, supply voltage range, and operating temperature range. The 20-CLCC package of the substitute part is footprint-compatible with the 20-LCC package of the original part.

Q: What are the differences in output drive capability?

A: The CY54FCT574ATLMB provides reduced output drive currents: 12mA high and 32mA low, compared to 15mA high and 48mA low in the 54FCT574ATLB. These values remain within standard logic levels and do not affect functional compatibility in typical applications.

Q: Does the lower quiescent current of the substitute part affect performance?

A: No. The CY54FCT574ATLMB operates at 200 µA quiescent current versus 1 mA in the original part. This represents improved power efficiency and does not impact logic operation or timing characteristics.

Q: Are there compliance differences between the two parts?

A: The CY54FCT574ATLMB is RoHS3 compliant, while the 54FCT574ATLB is RoHS non-compliant. The substitute part is also active in production, whereas the original is obsolete. These factors may influence selection based on regulatory or supply chain requirements.

Q: Is the package change from 20-LCC to 20-CLCC significant?

A: Both packages maintain identical 8.89x8.89mm footprints and pinout configurations. The CLCC variant is a ceramic leadless chip carrier, functionally equivalent to the LCC package for board-level integration purposes.