54FCT240ATDB Equivalent & Substitute Parts

Part Overview

The 54FCT240ATDB is an inverting buffer logic integrated circuit manufactured by Renesas Electronics Corporation. This device functions as a 2-element, 4-bit per element buffer with 3-state output capability, designed for 4.5V to 5.5V supply voltage operation across military temperature ranges (-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	Value
Logic Type	Buffer, Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	12mA, 48mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-55°C ~ 125°C (TA)
Package / Case	20-CDIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 54FCT240ATDB are qualified based on the following critical parameters that must match or exceed the original specification:

Logic Type: Buffer, Inverting (exact match required)
Number of Elements: 2 (exact match required)
Number of Bits per Element: 4 (exact match required)
Output Type: 3-State (exact match required)
Current - Output High, Low: 12mA, 48mA (exact match required)
Voltage - Supply: 4.5V ~ 5.5V (exact match required)
Operating Temperature: -55°C ~ 125°C (exact match required)
Package / Case: 20-CDIP (exact match required)
Mounting Type: Through Hole (exact match required)

All identified substitute parts meet these electrical and mechanical parameters, ensuring functional and physical compatibility with the original 54FCT240ATDB in existing circuit designs.

Parameter Comparison

Parameter	54FCT240ATDB (Renesas)	M38510/38301BRA (Texas Instruments)	SN54F240J (Texas Instruments)	SNJ54BCT240J (Texas Instruments)
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting
Number of Elements	2	2	2	2
Number of Bits per Element	4	4	4	4
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	12mA, 48mA	12mA, 48mA	12mA, 48mA	12mA, 48mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-55°C ~ 125°C (TA)	-55°C ~ 125°C (TA)	-55°C ~ 125°C (TA)	-55°C ~ 125°C (TA)
Package / Case	20-CDIP (0.300", 7.62mm)	20-CDIP (0.300", 7.62mm)	20-CDIP (0.300", 7.62mm)	20-CDIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

All three substitute parts—M38510/38301BRA, SN54F240J, and SNJ54BCT240J—provide complete electrical and mechanical equivalence to the 54FCT240ATDB. Selection among these alternatives should be based on the following factors:

M38510/38301BRA (Texas Instruments, 54ALS Series): This part is ROHS3 compliant and maintains active product status. It is suitable for applications requiring modern compliance certifications while maintaining full parametric compatibility.

SN54F240J (Texas Instruments, 54F Series): This part is ROHS3 compliant and maintains active product status. It represents a direct series equivalent with established availability and active manufacturing support.

SNJ54BCT240J (Texas Instruments, 54BCT Series): This part maintains active product status and is available in bulk packaging. Product status and compliance information align with current manufacturing standards.

For applications where RoHS compliance is mandatory, M38510/38301BRA and SN54F240J are preferred. For applications with no compliance requirements, all three substitutes remain functionally equivalent.

Frequently Asked Questions (FAQ)

Q: Can the 54FCT240ATDB be directly replaced with any of these substitute parts?

A: Yes. All three substitute parts meet the complete set of electrical and mechanical parameters required for direct substitution: 2-element, 4-bit per element inverting buffer with 3-state output, 12mA/48mA output current, 4.5V to 5.5V supply voltage, -55°C to 125°C operating temperature range, and 20-CDIP through-hole package.

Q: What is the difference between the 54ALS, 54F, and 54BCT series variants?

A: These designations indicate different logic families within the TTL/CMOS technology spectrum. All three families provide the same functional and electrical characteristics specified for this buffer application. Series selection depends on availability and compliance requirements rather than functional differences.

Q: Are there any packaging differences between these parts?

A: No. All substitute parts use the identical 20-CDIP (0.300", 7.62mm) through-hole package, ensuring mechanical compatibility with existing PCB layouts and socket configurations.

Q: Why is the original 54FCT240ATDB marked as obsolete?

A: Obsolescence typically reflects manufacturer discontinuation of production. Active substitute parts from Texas Instruments provide continued availability and support for this functional requirement.

Q: Which substitute should be selected for new designs?

A: For new designs, SN54F240J or M38510/38301BRA are recommended due to active product status and ROHS3 compliance certification, ensuring long-term availability and regulatory alignment.

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