74HCT240DB,118 Equivalent & Substitute Parts

Part Overview

The 74HCT240DB,118 is a Buffer, Inverting logic IC manufactured by Nexperia USA Inc. in a 20-SSOP package. This component features 2 elements with 4 bits per element and 3-state output capability, operating across a 4.5V to 5.5V supply voltage range. The part is currently listed as Obsolete, making equivalent and substitute parts necessary 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)
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)
Base Product Number	74HCT240
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74HCT240DB,118 is determined by the following critical parameters:

Logic Function: Buffer, Inverting with 2 elements, 4 bits per element, 3-state output
Electrical Specifications: Supply voltage 4.5V ~ 5.5V, output current 6mA (high and low)
Package Compatibility: Surface mount packages (20-SSOP or 20-TSSOP variants)
Base Product Number: 74HCT240 series
Compliance: RoHS3 compliance and MSL rating

Substitute parts maintain identical logic function and electrical performance. Package variations between 20-SSOP (0.209" width) and 20-TSSOP (0.173" width) are both acceptable for the 74HCT240 series, as they share the same pinout and electrical characteristics. Operating temperature ranges may vary between -40°C to 125°C or -40°C to 85°C depending on manufacturer specifications.

Parameter Comparison

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

Engineering Selection Recommendations

Primary Recommendation: 74HCT240PW,118 (NXP USA Inc.)

This part is the direct successor from NXP, maintaining identical electrical specifications and operating temperature range (-40°C to 125°C) as the original 74HCT240DB,118. Active product status ensures long-term availability and supply chain stability. The 20-TSSOP package is functionally equivalent to the 20-SSOP variant with identical pinout.

Secondary Recommendations:

CD74HCT240PWR (Texas Instruments): Active status with extended temperature range (-55°C to 125°C). Suitable for applications requiring broader temperature operation. Available in Tape & Reel packaging.
SN74HCT240PWR (Texas Instruments): Active status with highest inventory availability (65,880 pcs). Maintains 6mA output current specification. Available in Cut Tape and Digi-Reel packaging formats.

Alternative Consideration:

MM74HCT240MTCX (Fairchild Semiconductor): Active status with higher output current (7.2mA vs. 6mA). Operating temperature limited to -40°C to 85°C. Suitable only for applications not requiring the full -40°C to 125°C range.

Avoid:

CD74HCT240PW: Last Time Buy status indicates limited future availability.
SN74HCT240PW and SN74HCT240PWT: Discontinued at DiGi Electronics; procurement may be restricted.

Frequently Asked Questions (FAQ)

Q: Can I use a 20-TSSOP package substitute in place of the 20-SSOP original?

A: Yes. Both 20-SSOP (0.209" width) and 20-TSSOP (0.173" width) packages share identical pinout and electrical characteristics for the 74HCT240 series. The TSSOP variant is a thinner shrink package suitable for the same PCB footprint with minor dimensional adjustments.

Q: What is the difference between the various Texas Instruments part numbers (CD74HCT240, SN74HCT240)?

A: The CD and SN prefixes indicate different product lines within Texas Instruments. CD74HCT240 parts support extended temperature range (-55°C to 125°C), while SN74HCT240 parts operate at -40°C to 85°C. Both maintain identical logic function and 6mA output current specifications.

Q: Is the MM74HCT240MTCX a suitable direct replacement?

A: The MM74HCT240MTCX is functionally compatible but has higher output current (7.2mA vs. 6mA) and a reduced operating temperature range (-40°C to 85°C vs. -40°C to 125°C). Use only if your application does not require operation above 85°C.

Q: Why should I avoid parts marked "Last Time Buy" or "Discontinued"?

A: Last Time Buy and Discontinued statuses indicate limited or no future availability. These parts should be used only for legacy system maintenance where no alternatives exist. For new designs or ongoing production, select parts with Active status.

Q: Are all substitute parts RoHS3 compliant?

A: The original 74HCT240DB,118 is RoHS3 compliant. Most active substitutes (74HCT240PW,118, CD74HCT240PWR, SN74HCT240PWR, SN74HCT240APWR) are also RoHS3 compliant. Verify compliance documentation for specific part selections.

Q: What packaging options are available for active substitutes?

A: Active substitutes are available in multiple packaging formats: Bulk, Tube, Tape & Reel (TR), and Cut Tape (CT) with Digi-Reel. Select packaging based on procurement volume and assembly requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message