CD74HCT240PWR Equivalent & Substitute Parts

Part Overview

The CD74HCT240PWR is an inverting buffer logic integrated circuit manufactured by Texas Instruments, designed for high-speed CMOS logic applications. This 20-TSSOP surface mount device functions as a 2-element, 4-bit buffer with 3-state output capability, operating across a 4.5V to 5.5V supply voltage range. The part is currently in active production status with 902 units in stock. Equivalent and substitute parts are identified to support component availability, supply chain flexibility, and design continuity in applications requiring inverting buffer functionality with identical or compatible electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD74HCT240PWR
Manufacturer	Texas Instruments
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	-55°C ~ 125°C (TA)
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the CD74HCT240PWR are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Logic Type: Buffer, Inverting (2 Element, 4 Bit per Element)
Output Type: 3-State
Package / Case: 20-TSSOP (0.173", 4.40mm Width)
Voltage - Supply: 4.5V ~ 5.5V
Current - Output High, Low: 6mA minimum per channel
Series: 74HCT
Mounting Type: Surface Mount

All identified substitute parts maintain identical logic functionality, pin configuration, and package footprint. Substitutes are classified as parametric equivalents or manufacturer-recommended alternatives based on electrical parameter alignment and product availability status.

Parameter Comparison

Parameter	CD74HCT240PWR (TI)	CD74HCT240PWT (National Semiconductor)	74HCT240PW,118 (NXP USA Inc.)	MM74HCT240MTCX (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	6mA, 6mA	6mA, 6mA	6mA, 6mA	7.2mA, 7.2mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Active	Active	Active
Series	74HCT	74HCT	74HCT	74HCT

Engineering Selection Recommendations

All four parts listed maintain active product status and are suitable for direct substitution in applications requiring 74HCT240 inverting buffer functionality. Selection criteria are based on the following factors:

CD74HCT240PWR (Texas Instruments): Primary reference part with extended operating temperature range (-55°C to 125°C), RoHS3 compliance, and MSL Level 1 rating. Recommended for applications requiring maximum temperature performance and unlimited moisture sensitivity tolerance.

CD74HCT240PWT (National Semiconductor): Parametric equivalent with identical electrical specifications and extended temperature range (-55°C to 125°C). Suitable for direct replacement where National Semiconductor sourcing is preferred or required.

74HCT240PW,118 (NXP USA Inc.): Manufacturer-recommended alternative with identical output current specifications. Operating temperature range is -40°C to 125°C, which is suitable for most industrial and commercial applications. Recommended where NXP supply chain integration is advantageous.

MM74HCT240MTCX (Fairchild Semiconductor): Manufacturer-recommended alternative with higher output current capability (7.2mA vs. 6mA), providing enhanced drive capability. Operating temperature range is -40°C to 85°C. Suitable for applications requiring increased output current margin or where Fairchild sourcing is specified.

Frequently Asked Questions (FAQ)

Q: Can the MM74HCT240MTCX replace the CD74HCT240PWR in all applications?

A: The MM74HCT240MTCX is electrically compatible for most applications due to higher output current (7.2mA vs. 6mA). However, the operating temperature range is limited to -40°C to 85°C compared to the CD74HCT240PWR range of -55°C to 125°C. Verify application temperature requirements before substitution.

Q: Are all substitute parts pin-compatible with the CD74HCT240PWR?

A: Yes. All substitute parts use the identical 20-TSSOP package with matching pin configuration and footprint. Direct PCB substitution is supported without layout modifications.

Q: What is the difference between the CD74HCT240PWT and CD74HCT240PWR?

A: Both parts are parametrically equivalent with identical electrical specifications and temperature ranges. The primary difference is manufacturer (National Semiconductor vs. Texas Instruments) and packaging format (Bulk vs. Tape & Reel).

Q: Which substitute part has the widest operating temperature range?

A: The CD74HCT240PWR and CD74HCT240PWT both support -55°C to 125°C operating temperature. The 74HCT240PW,118 and MM74HCT240MTCX are limited to -40°C minimum temperature.

Q: Is the higher output current of the MM74HCT240MTCX (7.2mA) a concern for compatibility?

A: No. Higher output current is a superset capability and does not create compatibility issues. The part will function correctly in circuits designed for 6mA output current. Verify that the application does not have current-limiting design constraints that would be affected by increased drive capability.

Q: Are all substitute parts RoHS compliant?

A: All parts are manufactured to RoHS3 compliance standards. Verify specific compliance documentation with the supplier if required for regulated applications.

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