74HCT240DB,112 Equivalent & Substitute Parts

Part Overview

The 74HCT240DB,112 is a high-speed CMOS logic buffer IC manufactured by Nexperia USA Inc. in a 20-SSOP package. This inverting buffer features 2 elements with 4 bits per element and 3-state output capability, designed for 5.5V logic applications. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HCT240DB,112
Manufacturer	Nexperia USA Inc.
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)
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)
Base Product Number	74HCT240
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74HCT240DB,112 is determined by strict equivalence in the following parameters:

Logic Type: Buffer, Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Voltage - Supply: 4.5V ~ 5.5V
Base Product Number: 74HCT240 series

All substitute parts listed maintain these core functional parameters. Package variations (SSOP vs. TSSOP) and output current specifications (6mA vs. 7.2mA) represent acceptable substitution criteria within the 74HCT240 logic family. Operating temperature ranges and product status variations do not preclude functional substitution when electrical parameters align.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range (°C)	Package	Product Status
74HCT240DB,112	Nexperia USA Inc.	Buffer, Inverting	2	4	3-State	6, 6	4.5 ~ 5.5V	-40 ~ 125	20-SSOP	Obsolete
74HCT240PW,118	NXP USA Inc.	Buffer, Inverting	2	4	3-State	6, 6	4.5 ~ 5.5V	-40 ~ 125	20-TSSOP	Active
CD74HCT240PW	Texas Instruments	Buffer, Inverting	2	4	3-State	6, 6	4.5 ~ 5.5V	-55 ~ 125	20-TSSOP	Last Time Buy
CD74HCT240PWR	Texas Instruments	Buffer, Inverting	2	4	3-State	6, 6	4.5 ~ 5.5V	-55 ~ 125	20-TSSOP	Active
CD74HCT240PWT	National Semiconductor	Buffer, Inverting	2	4	3-State	6, 6	4.5 ~ 5.5V	-55 ~ 125	20-TSSOP	Active
MM74HCT240MTCX	Fairchild Semiconductor	Buffer, Inverting	2	4	3-State	7.2, 7.2	4.5 ~ 5.5V	-40 ~ 85	20-TSSOP	Active
SN74HCT240APWR	Texas Instruments	Buffer, Inverting	2	4	3-State	6, 6	4.5 ~ 5.5V	-40 ~ 85	20-TSSOP	Active
SN74HCT240PW	Texas Instruments	Buffer, Inverting	2	4	3-State	6, 6	4.5 ~ 5.5V	-40 ~ 85	20-TSSOP	Discontinued at DiGi Electronics
SN74HCT240PWR	Texas Instruments	Buffer, Inverting	2	4	3-State	6, 6	4.5 ~ 5.5V	-40 ~ 85	20-TSSOP	Active
SN74HCT240PWT	Texas Instruments	Buffer, Inverting	2	4	3-State	6, 6	4.5 ~ 5.5V	-40 ~ 85	20-TSSOP	Discontinued at DiGi Electronics

Engineering Selection Recommendations

For applications currently using the obsolete 74HCT240DB,112, the following selection criteria apply:

Primary Recommendation: 74HCT240PW,118 (NXP USA Inc., Active status) provides direct functional equivalence with identical electrical parameters and extended temperature range support (-40°C to 125°C). This part maintains ROHS3 compliance and unlimited moisture sensitivity rating.

Alternative with Extended Temperature: CD74HCT240PWR (Texas Instruments, Active status) offers expanded operating temperature range (-55°C to 125°C) with ROHS3 compliance and identical output current specifications. This option suits applications requiring enhanced thermal performance.

High-Volume Availability: SN74HCT240PWR (Texas Instruments, Active status) provides the highest inventory availability (65,880 pcs) with active product status, ROHS3 compliance, and standard operating temperature range (-40°C to 85°C).

Package Consideration: All substitute parts use 20-TSSOP packaging (0.173", 4.40mm width) compared to the original 20-SSOP (0.209", 5.30mm width). PCB layout modifications are required for package migration.

Output Current Variance: MM74HCT240MTCX (Fairchild Semiconductor) specifies 7.2mA output current versus the standard 6mA. This part remains functionally compatible but operates at higher current levels.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74HCT240DB,112 with any of these substitute parts?

A: Functional substitution is possible for all listed parts based on matching logic type, element count, bit configuration, output type, and supply voltage. Physical package differences (SSOP to TSSOP) require PCB layout modifications. Verify your application's temperature and current requirements against the selected substitute.

Q: What is the difference between 20-SSOP and 20-TSSOP packages?

A: The 20-SSOP package measures 0.209" (5.30mm) in width, while 20-TSSOP measures 0.173" (4.40mm). TSSOP is a thinner shrink package. Pin pitch and footprint differ, requiring PCB redesign for package migration.

Q: Which substitute offers the best long-term availability?

A: SN74HCT240PWR (Texas Instruments) maintains active product status with the highest inventory level (65,880 pcs). This part is recommended for new designs requiring sustained component availability.

Q: Are all substitutes RoHS3 compliant?

A: CD74HCT240PW, CD74HCT240PWR, SN74HCT240APWR, SN74HCT240PW, SN74HCT240PWR, and SN74HCT240PWT carry explicit ROHS3 compliance certification. CD74HCT240PWT and MM74HCT240MTCX do not list RoHS status in provided specifications.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not preclude substitution if your application operates within the substitute part's specified range. The original part supports -40°C to 125°C. Substitutes range from -40°C to 85°C (standard) to -55°C to 125°C (extended). Select based on your thermal requirements.

Q: What is the significance of output current differences?

A: The original 74HCT240DB,112 and most substitutes specify 6mA output current (high and low). MM74HCT240MTCX specifies 7.2mA. Higher output current provides greater drive capability but increases power dissipation. Verify your load requirements before selecting this variant.

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