54FCT244ATLB Equivalent & Substitute Parts

Part Overview

The 54FCT244ATLB is a non-inverting buffer IC manufactured by Renesas Electronics Corporation, designed for logic applications requiring 2-element, 4-bit per element configurations with 3-state output capability. This component operates across a 4.5V to 5.5V supply range and is housed in a 20-LCC package measuring 8.89x8.89mm. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

54FCT244ATLB

Renesas Electronics CorporationIn Stock: 107754FCT244ATLB Datasheet

Current PartRFQ

74FCT244ATQG

IDT, Integrated Device Technology IncIn Stock: 240074FCT244ATQG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 54FCT244ATLB is determined by functional equivalence across the following critical parameters:

• Logic Type: Buffer, Non-Inverting configuration
• Element and Bit Configuration: 2 elements with 4 bits per element
• Output Architecture: 3-State output capability
• Supply Voltage Range: Compatibility within specified operating voltage
• Output Current Ratings: Sufficient drive capability for intended load
• Operating Temperature Range: Functional performance across specified thermal envelope
• Package Type: Physical form factor and pin compatibility

The 74FCT244ATQG qualifies as a substitute based on matching logic type, element count, bit configuration, and output type. Variations in package form factor, supply voltage range, output current specifications, and operating temperature range represent acceptable engineering trade-offs when the primary functional requirements are maintained.

Parameter Comparison

Engineering Selection Recommendations

The 74FCT244ATQG represents an active product alternative to the obsolete 54FCT244ATLB. Both components share identical functional logic architecture, element configuration, and output characteristics. The substitute maintains the core buffer, non-inverting topology with 2-element, 4-bit per element structure and 3-state output capability.

Selection of the 74FCT244ATQG requires consideration of the following parameter differences:

• Output current specifications increase from 12mA/48mA to 15mA/64mA, providing enhanced drive capability
• Supply voltage range narrows from 4.5V–5.5V to 4.75V–5.25V, requiring verification of system supply tolerance
• Operating temperature range reduces from -55°C–125°C to -40°C–85°C, necessitating thermal environment assessment
• Package form factor changes from 20-LCC to 20-SSOP, requiring PCB layout and mechanical accommodation evaluation

The active product status of the 74FCT244ATQG ensures ongoing availability and manufacturing support, addressing the obsolescence constraint of the original component.

Frequently Asked Questions (FAQ)

Q: Can the 74FCT244ATQG directly replace the 54FCT244ATLB in existing designs?

A: Functional replacement is possible when system parameters fall within the substitute's operating envelope. Verification is required for supply voltage range (4.75V–5.25V minimum), operating temperature range (-40°C–85°C maximum), and package accommodation (20-SSOP versus 20-LCC).

Q: What are the primary differences between these two parts?

A: The components share identical logic function and configuration. Differences exist in output current ratings (higher in the substitute), supply voltage range (narrower in the substitute), operating temperature range (narrower in the substitute), and physical package form factor (20-SSOP versus 20-LCC).

Q: Does the package change from 20-LCC to 20-SSOP affect pin compatibility?

A: Both packages maintain 20-pin configurations with identical pin assignments for the buffer logic function. Physical dimensions and mounting characteristics differ, requiring PCB redesign and mechanical evaluation.

Q: Are there compliance or certification differences between these parts?

A: Both components share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. RoHS and REACH status information is provided in the original part specifications.

Q: What output current capability should be considered for load selection?

A: The 54FCT244ATLB provides 12mA high and 48mA low output current. The 74FCT244ATQG provides 15mA high and 64mA low output current. System load requirements must remain within the selected component's rated output current specifications.