SN74F240DW Equivalent & Substitute Parts

Part Overview

The SN74F240DW is a logic buffer IC with inverting functionality, featuring 2 elements with 4 bits per element and 3-state output capability. Manufactured by Texas Instruments in a 20-SOIC package, this component operates across a 4.5V to 5.5V supply voltage range and is rated for 0°C to 70°C operating temperature. The part carries Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

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	15mA
Current - Output Low	64mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74F240DW are qualified based on strict electrical and mechanical compatibility. All substitute candidates must maintain identical specifications across the following critical parameters:

Logic configuration (Buffer, Inverting with 2 elements, 4 bits per element, 3-state output), output current ratings (15mA high, 64mA low), supply voltage range (4.5V ~ 5.5V), operating temperature range (0°C ~ 70°C), package type (20-SOIC), and mounting method (Surface Mount).

The substitute parts identified—SN74F240DWR, SN74AS240ADW, and SN74BCT240DW—meet all these electrical and mechanical requirements. Differences exist only in product status and series designation (74F, 74AS, 74BCT), which represent different logic family implementations with equivalent functional performance.

Parameter Comparison

Parameter	SN74F240DW	SN74F240DWR	SN74AS240ADW	SN74BCT240DW
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	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	15mA, 64mA	15mA, 64mA	15mA, 64mA	15mA, 64mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Last Time Buy	Active	Active	Active
Series	74F	74F	74AS	74BCT

Engineering Selection Recommendations

For applications currently using the SN74F240DW, the SN74F240DWR is the primary recommended substitute. Both parts belong to the 74F logic family and maintain identical electrical and mechanical specifications. The SN74F240DWR carries Active product status, ensuring continued availability and manufacturing support, whereas the SN74F240DW is designated Last Time Buy.

The SN74AS240ADW and SN74BCT240DW represent parametric equivalents from alternative logic families (74AS and 74BCT respectively). These parts satisfy all functional and electrical requirements and are suitable for direct substitution. Both maintain Active product status and full ROHS3 compliance.

All three substitute parts are manufactured by Texas Instruments and carry identical RoHS and REACH certifications as the original SN74F240DW, ensuring regulatory compliance across applications.

Frequently Asked Questions (FAQ)

Q: Can SN74F240DWR be used as a direct replacement for SN74F240DW?

A: Yes. Both parts are identical in electrical performance, output current ratings, supply voltage range, operating temperature, and 20-SOIC package configuration. The primary difference is product status; SN74F240DWR is Active while SN74F240DW is Last Time Buy.

Q: What is the difference between 74F, 74AS, and 74BCT logic families?

A: These designations identify different logic family implementations. For the SN74F240DW, SN74AS240ADW, and SN74BCT240DW, all three families deliver identical functional performance, output current specifications, and voltage ratings. The family designation reflects internal circuit design differences that do not affect substitutability for this application.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts—SN74F240DWR, SN74AS240ADW, and SN74BCT240DW—are available in the 20-SOIC (0.295", 7.50mm Width) surface mount package, ensuring PCB compatibility without layout modifications.

Q: Do the substitute parts meet the same compliance requirements?

A: Yes. All substitute parts carry ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and REACH Unaffected status, matching the original SN74F240DW specifications.

Q: Which substitute part should be selected for new designs?

A: For new designs, any of the three substitute parts is suitable based on availability and supply chain considerations. All three carry Active product status and identical electrical specifications. Consult current inventory and lead time data to determine the most practical selection.

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