SN74ACT240PWG4 Equivalent & Substitute Parts

Part Overview

The SN74ACT240PWG4 is a Buffer, Inverting logic IC featuring 2 elements with 4 bits per element and 3-state output capability. Manufactured by Texas Instruments, this component operates across a 4.5V to 5.5V supply voltage range and is housed in a 20-TSSOP package. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design requirements and procurement needs.

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	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74ACT240PWG4 is determined by strict parameter matching across the following criteria:

Critical Matching Parameters:

Logic Type: Buffer, Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Current - Output High, Low: 24mA, 24mA
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: -40°C ~ 85°C (TA)
Package / Case: 20-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount

All substitute parts listed below meet these electrical and mechanical specifications without exception. Substitution is valid only when all parameters align with the original component.

Parameter Comparison

Parameter	SN74ACT240PWG4 (Main)	SN74ACT240PWR	74ACT240MTCX	SN74ACT240PW	74ACT240MTC
Manufacturer	Texas Instruments	Texas Instruments	onsemi	Texas Instruments	Fairchild Semiconductor
Logic Type	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting	Buffer, Inverting
Number of Elements	2	2	2	2	2
Number of Bits per Element	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified
Product Status	Discontinued at DiGi Electronics	Active	Active	Discontinued at DiGi Electronics	Active
Packaging Option	-	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tube	-

Engineering Selection Recommendations

Primary Recommendation: SN74ACT240PWR

The SN74ACT240PWR is the direct manufacturer equivalent from Texas Instruments with active product status. This part maintains identical electrical specifications and 20-TSSOP packaging. Availability is confirmed at 2900 units in stock. This substitute is suitable for direct replacement in all applications where the SN74ACT240PWG4 was specified.

Secondary Recommendation: 74ACT240MTCX

The 74ACT240MTCX from onsemi provides parametric equivalence with all critical electrical and mechanical parameters matching the original part. Product status is active with substantial inventory availability (55730 units). This option is appropriate when Texas Instruments sourcing is constrained.

Alternative Option: 74ACT240MTC

The 74ACT240MTC from Fairchild Semiconductor meets all electrical and mechanical substitution criteria with active product status. This part is available in high volume (26648 units). Selection of this part is valid when both primary and secondary options are unavailable.

Discontinued Part Note: SN74ACT240PW

The SN74ACT240PW is discontinued at DiGi Electronics and should not be selected for new designs despite meeting all technical parameters. This part is listed for reference only in legacy system documentation.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT240PWR be used as a direct replacement for SN74ACT240PWG4?

A: Yes. The SN74ACT240PWR is electrically and mechanically identical to the SN74ACT240PWG4. Both parts share the same logic type, element count, bit configuration, output type, current ratings, supply voltage range, operating temperature range, and 20-TSSOP package. The primary difference is product status: SN74ACT240PWR is active while SN74ACT240PWG4 is discontinued.

Q: What is the difference between the packaging options listed for substitute parts?

A: Packaging options (Cut Tape, Tape & Reel, Tube) refer to the physical format in which components are supplied for assembly. These options do not affect electrical performance or mechanical compatibility. Selection depends on manufacturing process requirements and procurement volume. The 20-TSSOP package specification remains constant across all options.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts meet ROHS3 compliance requirements. The SN74ACT240PWG4 original part is also ROHS3 compliant. Compliance status is consistent across all equivalent options.

Q: Can I use 74ACT240MTCX from onsemi instead of the Texas Instruments equivalent?

A: Yes. The 74ACT240MTCX meets all electrical and mechanical specifications required for substitution. Manufacturer selection between Texas Instruments and onsemi does not affect functional performance when all parameters are identical. Selection may be based on availability, lead time, or procurement preference.

Q: What determines whether a part is a valid substitute?

A: Valid substitution requires matching across all critical parameters: logic type, element count, bits per element, output type, current ratings, supply voltage, operating temperature range, package type, and mounting method. All listed substitute parts satisfy these criteria without exception.

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