74HCT240PW,112 Equivalent & Substitute Parts

Part Overview

The 74HCT240PW,112 is a Buffer, Inverting logic IC manufactured by Nexperia USA Inc. in a 20-TSSOP surface mount package. This device functions as a 2-element, 4-bit inverting buffer with 3-state output capability, operating across a 4.5V to 5.5V supply voltage range. The part is currently classified as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

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	6mA, 6mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°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 of the 74HCT240PW,112 is determined by strict equivalence across the following critical parameters:

Logic Type: Buffer, Inverting (2 elements, 4 bits per element)
Output Configuration: 3-State output
Supply Voltage Range: 4.5V ~ 5.5V
Package: 20-TSSOP surface mount
Output Current Capability: 6mA minimum (high and low)
Operating Temperature Range: Minimum -40°C, maximum 125°C

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

Category A (6mA Output Current): CD74HCT240PW, CD74HCT240PWR, CD74HCT240PWT, SN74HCT240APWR, SN74HCT240PW, SN74HCT240PWR, SN74HCT240PWT

Category B (Higher Output Current): MC74VHCT240ADTRG (8mA), MM74HCT240MTCX (7.2mA)

All substitute parts maintain the 20-TSSOP package footprint and surface mount configuration. Differences in operating temperature range and product status are noted for design consideration.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Output Current (mA)	Operating Temp (°C)	Product Status	Packaging
74HCT240PW,112	Nexperia USA Inc.	Buffer, Inverting	6, 6	-40 ~ 125	Obsolete	Tube
CD74HCT240PW	Texas Instruments	Buffer, Inverting	6, 6	-55 ~ 125	Last Time Buy	Tube
CD74HCT240PWR	Texas Instruments	Buffer, Inverting	6, 6	-55 ~ 125	Active	Tape & Reel (TR)
CD74HCT240PWT	National Semiconductor	Buffer, Inverting	6, 6	-55 ~ 125	Active	Bulk
MC74VHCT240ADTRG	onsemi	Buffer, Inverting	8, 8	-40 ~ 85	Active	Tape & Reel (TR)
MM74HCT240MTCX	Fairchild Semiconductor	Buffer, Inverting	7.2, 7.2	-40 ~ 85	Active	Surface Mount
SN74HCT240APWR	Texas Instruments	Buffer, Inverting	6, 6	-40 ~ 85	Active	Surface Mount
SN74HCT240PW	Texas Instruments	Buffer, Inverting	6, 6	-40 ~ 85	Discontinued at DiGi Electronics	Tube
SN74HCT240PWR	Texas Instruments	Buffer, Inverting	6, 6	-40 ~ 85	Active	Cut Tape (CT) & Digi-Reel®
SN74HCT240PWT	Texas Instruments	Buffer, Inverting	6, 6	-40 ~ 85	Discontinued at DiGi Electronics	Tape & Reel (TR)

Engineering Selection Recommendations

For applications requiring direct replacement of the 74HCT240PW,112:

Primary Selection: CD74HCT240PWR (Texas Instruments) or SN74HCT240PWR (Texas Instruments). Both parts are Active status, maintain 6mA output current specification, and are available in standard packaging formats. CD74HCT240PWR offers extended operating temperature range (-55°C to 125°C) suitable for industrial applications.

Extended Temperature Range: CD74HCT240PW or CD74HCT240PWT for applications requiring operation down to -55°C. Both maintain full 6mA output current and are ROHS3 compliant.

Higher Output Current Requirement: MM74HCT240MTCX (7.2mA) or MC74VHCT240ADTRG (8mA) for designs requiring increased drive capability. Note that MC74VHCT240ADTRG operates to 85°C maximum, limiting use in extended temperature applications.

Availability Consideration: SN74HCT240PWR provides the highest inventory availability (65,880 pcs) among Active status parts, supporting volume production requirements.

All recommended substitutes maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can the 74HCT240PW,112 be directly replaced with any of the listed substitutes?

A: Direct replacement is possible with parts maintaining identical output current (6mA), supply voltage range (4.5V ~ 5.5V), and 20-TSSOP package. CD74HCT240PWR and SN74HCT240PWR are primary direct replacements. Parts with higher output current (MM74HCT240MTCX, MC74VHCT240ADTRG) are functionally compatible but provide excess capability.

Q: What is the difference between the Texas Instruments SN74HCT240 variants?

A: SN74HCT240PW (Tube packaging, Discontinued at DiGi Electronics), SN74HCT240PWR (Cut Tape & Digi-Reel, Active), and SN74HCT240PWT (Tape & Reel, Discontinued at DiGi Electronics) are identical in electrical specification. Selection depends on packaging format required for assembly and procurement processes.

Q: Are there temperature range limitations when substituting?

A: The original 74HCT240PW,112 operates to 125°C. CD74HCT240PW and CD74HCT240PWR maintain this range. SN74HCT240 variants and MM74HCT240MTCX operate to 85°C maximum. MC74VHCT240ADTRG also operates to 85°C. Verify application temperature requirements before selection.

Q: What is the significance of the different packaging options?

A: Tube, Tape & Reel (TR), Cut Tape (CT), and Bulk packaging affect handling, storage, and automated assembly compatibility. 20-TSSOP package dimensions remain constant across all variants. Select packaging based on production volume and assembly equipment capability.

Q: Can I use MC74VHCT240ADTRG as a substitute despite the different series designation?

A: MC74VHCT240ADTRG (74VHCT series) maintains functional equivalence in logic type, element count, output configuration, and supply voltage. The VHCT designation indicates enhanced performance characteristics. Output current is 8mA versus 6mA, and maximum operating temperature is 85°C versus 125°C. Use only if application temperature requirements are satisfied.

Q: Are all substitutes ROHS3 compliant?

A: CD74HCT240PW, CD74HCT240PWR, CD74HCT240PWT, SN74HCT240APWR, SN74HCT240PW, and SN74HCT240PWR are confirmed ROHS3 compliant. MM74HCT240MTCX and MC74VHCT240ADTRG are ROHS3 compliant. Verify compliance documentation for specific procurement requirements.

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