54FCT245TDB Equivalent & Substitute Parts

Part Overview

The 54FCT245TDB is an octal bus transceiver with non-inverting logic, manufactured by Renesas Electronics Corporation. This device functions as a 1-element, 8-bit per element transceiver with 3-state output capability, operating across a 4.5V to 5.5V supply voltage range and temperature range of -55°C to 125°C. The part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Specification
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High	12mA
Current - Output Low	48mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-55°C ~ 125°C (TA)
Mounting Type	Through Hole
Package / Case	20-CDIP (0.300", 7.62mm)

Substitute Part Grouping Explanation

Substitute parts for the 54FCT245TDB are selected based on strict parametric equivalence across the following critical criteria:

Logic Type: Transceiver, Non-Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Package / Case: 20-CDIP (0.300", 7.62mm)
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: -55°C ~ 125°C (TA)
Mounting Type: Through Hole

Substitute parts are grouped into two categories based on output current specifications:

Category A - Full Current Match (12mA High, 48mA Low): Parts with identical output current ratings to the 54FCT245TDB, ensuring direct functional replacement without circuit redesign.

Category B - Reduced Current Output (3mA/15mA High, 24mA/64mA Low): Parts with different output current specifications that may require circuit evaluation for specific applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Product Status	Current - Output High / Low (mA)	RoHS Status	Inventory (Pcs)
54FCT245TDB	Renesas Electronics Corporation	54FCT	Obsolete	12 / 48	RoHS non-compliant	1403
Category A - Full Current Match
8551101RA	Texas Instruments	54F	Active	12 / 48	ROHS3 Compliant	888
CY54FCT245ATDMB	Texas Instruments	54FCT	Active	12 / 48	ROHS3 Compliant	1546
JM38510/34803BRA	Texas Instruments	54F	Active	12 / 48	ROHS3 Compliant	745
M38510/34803BRA	Texas Instruments	54F	Active	12 / 48	ROHS3 Compliant	854
SN54F245J	Texas Instruments	54F	Active	12 / 48	ROHS3 Compliant	1416
SNJ54AS645J	Texas Instruments	54AS	Active	12 / 48	ROHS3 Compliant	1043
SNJ54BCT623J	Texas Instruments	54BCT	Active	12 / 48	ROHS3 Compliant	796
SNJ54F245J	Texas Instruments	54F	Active	12 / 48	ROHS3 Compliant	1130
Category B - Reduced Current Output
SNJ54BCT245J	Texas Instruments	54BCT	Active	3 / 24 or 15 / 64	Not specified	895
SN54AS645J	Texas Instruments	*	Active	Not specified	Not specified	1339

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 54FCT245TDB, Category A substitute parts are the primary selection criteria. These parts maintain identical electrical output characteristics (12mA high, 48mA low) and are all manufactured by Texas Instruments with active product status.

Among Category A options, CY54FCT245ATDMB is recommended as the primary substitute due to matching series designation (54FCT), ROHS3 compliance, and highest inventory availability (1546 pcs). This part provides the most direct functional equivalence with modern compliance certifications.

SNJ54F245J and SN54F245J represent alternative active substitutes within the 54F series, both with ROHS3 compliance and substantial inventory levels. These parts are suitable for applications where series variation is acceptable.

Category B parts (SNJ54BCT245J and SN54AS645J) feature reduced output current specifications and should be evaluated only when circuit design permits lower drive capability or when specific application requirements align with their electrical characteristics.

All recommended Category A substitutes operate within the identical voltage supply range (4.5V ~ 5.5V), temperature range (-55°C ~ 125°C), and package specification (20-CDIP), ensuring mechanical and thermal compatibility with existing designs.

Frequently Asked Questions (FAQ)

Q: Can I use any substitute part listed in this document as a direct replacement?

A: Category A parts (those with 12mA high and 48mA low output current) are direct functional replacements. Category B parts require circuit evaluation due to different output current specifications. Verify your application's current requirements before selection.

Q: What is the difference between the 54FCT, 54F, and 54AS series substitutes?

A: All listed substitutes maintain identical logic type (non-inverting transceiver), element count (1), bit width (8), output type (3-state), and package (20-CDIP). Series designation indicates manufacturing process technology. All are functionally equivalent for the specified parameters.

Q: Why is the 54FCT245TDB marked as obsolete?

A: The original Renesas part has reached end-of-life status. Active substitutes from Texas Instruments provide equivalent functionality with modern manufacturing and compliance certifications (ROHS3).

Q: Are all substitute parts ROHS3 compliant?

A: Category A substitutes are ROHS3 compliant. Category B parts have varying compliance documentation. Verify RoHS status requirements for your specific application before final selection.

Q: Does package compatibility guarantee mechanical fit?

A: Yes. All listed substitutes use the 20-CDIP (0.300", 7.62mm) package specification, ensuring identical pin count, spacing, and through-hole mounting compatibility with the original 54FCT245TDB.

Q: What is the operating temperature range for substitute parts?

A: All Category A substitutes operate across -55°C to 125°C (TA), matching the original part specification. Verify Category B parts for specific applications requiring extended temperature ranges.

Q: Can I mix substitute parts in the same circuit?

A: Yes, provided all selected parts are from Category A (matching output current specifications). Mixing Category A and Category B parts in the same circuit requires circuit analysis to ensure current drive requirements are met.

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