54FCT374CTDB Equivalent & Substitute Parts

Part Overview

The 54FCT374CTDB is an octal D-type flip-flop register with tri-state output, manufactured by Renesas Electronics Corporation. This logic IC functions as a standard D-type register with 8-bit parallel data storage capability and positive edge triggering. The device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 20-CDIP package format and tri-state output configuration define the core functional requirements for identifying compatible alternatives.

Substiute Parts

54FCT374CTDB

Renesas Electronics CorporationIn Stock: 92154FCT374CTDB Datasheet

Current PartRFQ

CY54FCT374ATDMB

Texas InstrumentsIn Stock: 1659CY54FCT374ATDMB Datasheet

DirectRFQ

CY54FCT374TDMB

Texas InstrumentsIn Stock: 1086CY54FCT374TDMB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 54FCT374CTDB are identified based on strict electrical and mechanical compatibility criteria. The following parameters must match or remain within acceptable operating ranges:

• Functional Type: D-Type flip-flop with 8-bit configuration and tri-state output
• Trigger Mechanism: Positive edge triggering
• Package Format: 20-CDIP (0.300", 7.62mm) through-hole mounting
• Supply Voltage Range: 4.5V ~ 5.5V compatibility
• Operating Temperature Range: -55°C ~ 125°C
• Output Configuration: Tri-state, non-inverted output

The substitute parts CY54FCT374ATDMB and CY54FCT374TDMB from Texas Instruments meet these core requirements. Both devices maintain the same package footprint, functional architecture, and electrical operating parameters necessary for direct substitution in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

Both CY54FCT374ATDMB and CY54FCT374TDMB are active products from Texas Instruments and provide functional equivalence to the obsolete 54FCT374CTDB. Selection between these two substitutes depends on propagation delay requirements:

CY54FCT374ATDMB exhibits a maximum propagation delay of 7.2ns at 5V and 50pF load, providing performance closer to the original 54FCT374CTDB specification of 6.2ns. This variant is suitable for timing-critical applications where propagation delay must remain within tighter margins.

CY54FCT374TDMB specifies a maximum propagation delay of 11ns at 5V and 50pF load. This variant is appropriate for applications where the extended propagation delay remains within system timing budgets.

Both substitutes are ROHS3 compliant, addressing regulatory requirements that the original obsolete part does not meet. Output current specifications (12mA high, 32mA low) are lower than the original device, requiring verification that load impedance and fan-out requirements remain compatible with the reduced drive capability. Quiescent current is reduced to 200 µA compared to the original 1 mA specification, providing improved power efficiency.

Frequently Asked Questions (FAQ)

Q: Can CY54FCT374ATDMB and CY54FCT374TDMB be used interchangeably with 54FCT374CTDB?

A: Both Texas Instruments parts are functionally equivalent and share identical package footprints, supply voltage ranges, and operating temperature specifications. Selection between them depends on propagation delay tolerance. The CY54FCT374ATDMB provides faster switching at 7.2ns, while the CY54FCT374TDMB operates at 11ns maximum delay.

Q: What are the key differences in electrical performance?

A: Output current drive is reduced in both substitutes (12mA/32mA versus 15mA/48mA). Quiescent current is significantly lower at 200 µA compared to 1 mA. Propagation delays differ between the two substitutes. These differences must be evaluated against specific circuit requirements for load impedance, fan-out, and timing margins.

Q: Are the substitute parts pin-compatible?

A: Both CY54FCT374ATDMB and CY54FCT374TDMB use the 20-CDIP package with identical pin assignments to the 54FCT374CTDB. Direct socket substitution is possible without PCB modification.

Q: What is the compliance status of the substitute parts?

A: Both Texas Instruments substitutes are ROHS3 compliant, addressing environmental and regulatory requirements. The original 54FCT374CTDB is RoHS non-compliant. Both substitutes carry the same ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: Which substitute should be selected for new designs?

A: CY54FCT374ATDMB is recommended for new designs requiring performance characteristics closer to the original specification. CY54FCT374TDMB is suitable when propagation delay tolerance permits the extended 11ns specification and cost optimization is a consideration.