SN74ACT240PW Equivalent & Substitute Parts

Part Overview

The SN74ACT240PW is a Buffer, Inverting logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This 20-TSSOP surface mount device operates across a 4.5V to 5.5V supply voltage range and is rated for -40°C to 85°C operating temperature. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications.

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

Substitute Part Grouping Explanation

Substitution for the SN74ACT240PW is determined by strict equivalence across the following critical 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)
Base Product Number: 74ACT240

All identified substitutes maintain identical electrical and mechanical specifications across these parameters, ensuring functional interchangeability within the same circuit design.

Parameter Comparison

Parameter	SN74ACT240PW (Main)	SN74ACT240PWR	74ACT240MTCX	74ACT240MTC
Manufacturer	Texas Instruments	Texas Instruments	onsemi	Fairchild Semiconductor
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	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
Operating Temperature	-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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

SN74ACT240PWR (Texas Instruments) is the primary direct substitute, maintaining identical specifications and packaging while offering active product status. This part is available in Cut Tape and Digi-Reel packaging formats with 2900 units in stock.

74ACT240MTCX (onsemi) provides a direct manufacturer alternative with active product status and the highest inventory availability at 55,730 units. This part is supplied in Tape & Reel packaging and maintains full electrical and mechanical equivalence.

74ACT240MTC (Fairchild Semiconductor) serves as a parametric equivalent with active product status and 26,648 units available. RoHS compliance status is not specified for this variant.

All three substitutes are suitable for applications requiring the SN74ACT240PW, with selection based on packaging preference, inventory availability, and supply chain considerations.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT240PWR be used as a direct replacement for SN74ACT240PW?

A: Yes. SN74ACT240PWR is a direct substitute manufactured by Texas Instruments with identical electrical specifications, output current ratings, supply voltage range, operating temperature range, and 20-TSSOP package configuration. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tube) and active product status.

Q: What is the difference between the three substitute parts?

A: All three substitutes (SN74ACT240PWR, 74ACT240MTCX, and 74ACT240MTC) are electrically and mechanically equivalent. Differences exist only in manufacturer (Texas Instruments, onsemi, and Fairchild Semiconductor respectively) and packaging format. Selection should be based on supply chain availability and packaging requirements.

Q: Are there any compatibility concerns when switching from SN74ACT240PW to a substitute?

A: No compatibility concerns exist when substituting with any of the listed parts. All substitutes maintain identical pin configuration, electrical characteristics, and 20-TSSOP package dimensions. Direct PCB and circuit design compatibility is assured.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (Tube, Cut Tape, Digi-Reel, or Tape & Reel) affects only handling, storage, and assembly processes. Electrical performance and specifications remain identical across all packaging variants of the same part number.

Q: Are all substitutes RoHS compliant?

A: SN74ACT240PWR and 74ACT240MTCX are confirmed ROHS3 compliant. RoHS compliance status for 74ACT240MTC is not specified in available documentation.

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