54FCT244TLB Equivalent & Substitute Parts

Part Overview

The 54FCT244TLB is a non-inverting buffer IC manufactured by Renesas Electronics Corporation, designed for logic signal buffering applications. This device features 2 elements with 4 bits per element and 3-state output capability, housed in a 20-LCC package. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

54FCT244TLB

Renesas Electronics CorporationIn Stock: 122854FCT244TLB Datasheet

Current PartRFQ

74FCT244ATQG

IDT, Integrated Device Technology IncIn Stock: 240074FCT244ATQG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 54FCT244TLB is determined by functional equivalence across the following critical parameters:

• Logic Type: Buffer, Non-Inverting configuration
• Element and Bit Configuration: 2 elements × 4 bits per element
• Output Architecture: 3-State output capability
• Supply Voltage Range: Compatibility within specified operating voltage
• Output Current Specifications: Drive capability for high and low states
• Operating Temperature Range: Thermal performance envelope
• Package Type: Physical form factor and pin configuration

The 74FCT244ATQG qualifies as a manufacturer-recommended substitute based on matching logic type, element configuration, bit density, and output characteristics. Both parts implement the same functional buffer architecture with 3-state output control.

Parameter Comparison

Engineering Selection Recommendations

The 74FCT244ATQG is designated as the manufacturer-recommended substitute for the obsolete 54FCT244TLB. Selection of this alternative is supported by:

• Active product status ensuring ongoing availability and manufacturing support
• Functional equivalence in buffer architecture, element count, and bit configuration
• Enhanced output current specifications (15mA high, 64mA low) providing improved drive capability
• Narrower supply voltage range (4.75V ~ 5.25V) within the original specification envelope
• Reduced operating temperature range (-40°C ~ 85°C) suitable for commercial and industrial applications

Package form factor differs between the original 20-LCC and substitute 20-SSOP configuration, requiring PCB layout and mechanical accommodation assessment during implementation.

Frequently Asked Questions (FAQ)

Q: Can the 74FCT244ATQG directly replace the 54FCT244TLB in existing designs?

A: Functional substitution is supported based on matching logic type, element configuration, and 3-state output characteristics. Package differences (20-LCC versus 20-SSOP) require PCB redesign and mechanical validation.

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

A: The 74FCT244ATQG provides higher output current capability (15mA/64mA versus 12mA/48mA). Supply voltage range is narrower (4.75V ~ 5.25V versus 4.5V ~ 5.5V). Operating temperature range is reduced (-40°C ~ 85°C versus -55°C ~ 125°C).

Q: Why is the 54FCT244TLB classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The 74FCT244ATQG maintains active production status and provides equivalent functionality for new designs and legacy system support.

Q: Are there package options available for the 74FCT244ATQG?

A: The 74FCT244ATQG is supplied in 20-QSOP packaging. The original 54FCT244TLB used 20-LCC packaging. Package selection depends on application requirements and PCB layout constraints.

Q: What compliance certifications apply to these parts?

A: Both parts share ECCN EAR99 and HTSUS 8542.39.0001 classifications. The 54FCT244TLB is RoHS non-compliant. Compliance requirements for the 74FCT244ATQG should be verified against specific application standards.