54FCT245CTLB Equivalent & Substitute Parts

Part Overview

The 54FCT245CTLB is an octal bus transceiver with non-inverting logic, featuring 3-state output capability. Manufactured by Renesas Electronics Corporation, this component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production support. The part operates within a 4.5V to 5.5V supply voltage range and is rated for military-grade temperature specifications (-55°C to 125°C). Equivalent and substitute parts must maintain identical electrical performance characteristics and compatible packaging footprints to ensure direct replacement capability.

Substiute Parts

54FCT245CTLB

Renesas Electronics CorporationIn Stock: 93354FCT245CTLB Datasheet

Current PartRFQ

CY54FCT245CTLMB

Texas InstrumentsIn Stock: 1005CY54FCT245CTLMB Datasheet

DirectRFQ

CY54FCT245TLMB

Texas InstrumentsIn Stock: 1133CY54FCT245TLMB Datasheet

DirectRFQ

74FCT245ATQG

Renesas Electronics CorporationIn Stock: 70374FCT245ATQG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 54FCT245CTLB are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Logic type: Transceiver, Non-Inverting
• Number of elements: 1
• Number of bits per element: 8
• Output type: 3-State
• Output current capability: 12mA (high), 48mA (low)
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: -55°C ~ 125°C
• Package compatibility: 20-LCC or 20-LCCC (pin-compatible variants)

Substitutes are grouped into two categories:

1. Direct Pin-Compatible Substitutes (20-LCCC Package): CY54FCT245CTLMB and CY54FCT245TLMB maintain identical electrical specifications and compatible package footprints, enabling direct replacement without circuit modification.

2. Functionally Equivalent Substitute (20-QSOP Package): 74FCT245ATQG provides equivalent logic functionality and electrical performance but requires package-level design consideration due to different physical form factor (20-SSOP vs. 20-LCC).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible): CY54FCT245CTLMB and CY54FCT245TLMB are recommended as primary substitutes for the obsolete 54FCT245CTLB. Both parts are manufactured by Texas Instruments, maintain active product status, and provide ROHS3 compliance. The 20-LCCC package is mechanically compatible with the original 20-LCC footprint, enabling direct board-level substitution without layout modification. Both alternatives are available in production quantities.

For New Designs with Package Flexibility: 74FCT245ATQG serves as a functionally equivalent alternative when package form factor change is acceptable. This part is manufactured by Renesas Electronics and maintains active product status with ROHS3 compliance. The 20-QSOP package requires PCB layout redesign but offers equivalent electrical performance. Note that the operating temperature range is reduced to -40°C to 85°C, which may not satisfy military-grade specifications requiring -55°C to 125°C operation.

Compliance Considerations: All active substitute parts (CY54FCT245CTLMB, CY54FCT245TLMB, and 74FCT245ATQG) are ROHS3 compliant, addressing environmental regulatory requirements that the obsolete 54FCT245CTLB does not meet.

Frequently Asked Questions (FAQ)

Q: Can CY54FCT245CTLMB and CY54FCT245TLMB be used interchangeably with 54FCT245CTLB? A: Yes. Both Texas Instruments parts maintain identical electrical specifications (output current, supply voltage, operating temperature) and compatible 20-LCCC package footprints. Direct substitution is supported without circuit modification.

Q: What is the difference between CY54FCT245CTLMB and CY54FCT245TLMB? A: Both parts are functionally and electrically identical. The difference lies in product designation and internal manufacturing specifications. Both are qualified substitutes with identical performance parameters.

Q: Can 74FCT245ATQG replace 54FCT245CTLB in existing designs? A: 74FCT245ATQG provides equivalent logic functionality and electrical performance but requires package-level design consideration. The 20-QSOP package differs from the original 20-LCC, necessitating PCB layout modification. Additionally, the operating temperature range (-40°C to 85°C) is narrower than the original specification (-55°C to 125°C), which may not satisfy military-grade applications.

Q: Are there any electrical performance differences between the substitute parts? A: CY54FCT245CTLMB and CY54FCT245TLMB maintain identical electrical specifications to the original part. 74FCT245ATQG exhibits higher output current capability (15mA high, 64mA low versus 12mA, 48mA) and a narrower supply voltage range (4.75V ~ 5.25V versus 4.5V ~ 5.5V), which may affect compatibility in systems with marginal power supply specifications.

Q: What is the inventory status of substitute parts? A: CY54FCT245CTLMB is available with 931 pieces in stock. CY54FCT245TLMB is available with 1108 pieces in stock. 74FCT245ATQG is available with 676 pieces in stock. All substitutes are available in production quantities.

Q: Do the substitute parts meet RoHS compliance requirements? A: Yes. CY54FCT245CTLMB, CY54FCT245TLMB, and 74FCT245ATQG are all ROHS3 compliant. The original 54FCT245CTLB is RoHS non-compliant, making substitution necessary for applications requiring environmental regulatory compliance.