CD74HCT240PW Equivalent & Substitute Parts

Part Overview

The CD74HCT240PW 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 supports operating temperatures from -55°C to 125°C. The part is currently in Last Time Buy status, making identification of equivalent and substitute components essential for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD74HCT240PW
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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD74HCT240PW is determined by strict equivalence across the following critical parameters:

Logic Type: Buffer, Inverting (2 Element, 4 Bit per Element)
Output Type: 3-State
Package / Case: 20-TSSOP surface mount
Voltage - Supply: 4.5V ~ 5.5V
Current - Output High, Low: 6mA minimum per channel
Operating Temperature Range: Minimum -40°C to 125°C

Substitute parts must maintain identical functional specifications and package footprint. Variations in output current capability, operating temperature range, or packaging format constitute design changes requiring circuit re-evaluation.

Parameter Comparison

Parameter	CD74HCT240PW (Main)	CD74HCT240PWR	74HCT240PW,118	74HCT240PW-Q100,11	MM74HCT240MTCX
Manufacturer	Texas Instruments	Texas Instruments	NXP USA Inc.	Nexperia USA Inc.	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	6mA, 6mA	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	4.5V ~ 5.5V
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Last Time Buy	Active	Active	Active	Active
Packaging Format	Tube	Tape & Reel (TR)	Bulk	Tape & Reel (TR)	-

Engineering Selection Recommendations

CD74HCT240PWR (Texas Instruments) is the manufacturer-recommended direct substitute, maintaining identical electrical specifications and operating temperature range (-55°C to 125°C) while offering Active product status. This part differs only in packaging format (Tape & Reel versus Tube).

74HCT240PW,118 (NXP USA Inc.) and 74HCT240PW-Q100,11 (Nexperia USA Inc.) are functionally equivalent alternatives with Active status. Both operate across -40°C to 125°C, representing a narrower low-temperature range compared to the main part. The 74HCT240PW-Q100,11 includes AEC-Q100 automotive qualification and ROHS3 compliance certification.

MM74HCT240MTCX (Fairchild Semiconductor) provides functional equivalence with higher output current capability (7.2mA versus 6mA) and operates across -40°C to 85°C, representing the most restricted operating temperature range. This part is suitable for applications not requiring extended low-temperature operation below -40°C.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT240PWR replace CD74HCT240PW in existing designs?

A: Yes. CD74HCT240PWR is electrically and functionally identical, with matching supply voltage (4.5V ~ 5.5V), output current (6mA), and operating temperature range (-55°C to 125°C). The only difference is packaging format (Tape & Reel versus Tube). No circuit modifications are required.

Q: What is the difference between 74HCT240PW,118 and the main part?

A: 74HCT240PW,118 maintains identical electrical specifications and 20-TSSOP package footprint. The operating temperature range is -40°C to 125°C, which is narrower at the low end compared to CD74HCT240PW (-55°C to 125°C). Applications requiring operation below -40°C must use the original part or CD74HCT240PWR.

Q: Is 74HCT240PW-Q100,11 suitable for automotive applications?

A: Yes. 74HCT240PW-Q100,11 carries AEC-Q100 automotive qualification and ROHS3 compliance. It maintains the 20-TSSOP package and equivalent electrical specifications, with operating temperature range of -40°C to 125°C.

Q: Why does MM74HCT240MTCX have higher output current?

A: MM74HCT240MTCX specifies 7.2mA output current versus 6mA for other variants. This higher capability is compatible with designs requiring the 6mA specification. However, the operating temperature range is limited to -40°C to 85°C, restricting use in applications requiring extended high-temperature operation above 85°C.

Q: Are all substitute parts available in the same 20-TSSOP package?

A: Yes. All listed substitute parts use the 20-TSSOP (0.173", 4.40mm Width) surface mount package, ensuring identical PCB footprint compatibility. Packaging format (Tube, Tape & Reel, Bulk) affects procurement and handling but not circuit performance.

Q: What compliance certifications apply to these parts?

A: CD74HCT240PW, CD74HCT240PWR, and 74HCT240PW-Q100,11 are ROHS3 compliant. All parts are EAR99 classified and REACH unaffected. The 74HCT240PW-Q100,11 includes additional AEC-Q100 automotive qualification.

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