SN74AHCT240PW Equivalent & Substitute Parts

Part Overview

The SN74AHCT240PW is a Buffer, Inverting logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-TSSOP surface mount package. This part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts maintain identical electrical specifications and mechanical compatibility while offering continued availability through alternative manufacturers and packaging options.

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	8mA, 8mA
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

Substitute Part Grouping Explanation

Substitute parts for the SN74AHCT240PW are classified based on the following substitution criteria:

Direct Substitutes (Identical Specifications): Parts maintaining all key electrical and mechanical parameters including logic type, element count, bit configuration, output type, current ratings, supply voltage range, operating temperature range, package type, and RoHS compliance status.

Series Variants (74AHCT vs 74VHCT): Parts from the 74VHCT series maintain functional equivalence with identical logic configuration and output characteristics. The 74VHCT series operates within a narrower temperature range (-40°C ~ 85°C) compared to the original 74AHCT specification (-40°C ~ 125°C), which may be acceptable depending on application requirements.

Manufacturer Variants: Multiple manufacturers produce functionally equivalent parts with identical specifications, differentiated by packaging format (Tube, Cut Tape, Tape & Reel, Bulk) and product status (Active vs Discontinued).

Automotive Grade Variants: The 74AHCT240PW-Q100J includes AEC-Q100 automotive qualification, suitable for applications requiring automotive-grade components.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Logic Type	Elements / Bits	Output Type	Current (mA)	Supply Voltage	Temp Range (°C)	Package	Product Status	Inventory (Pcs)
SN74AHCT240PW	Texas Instruments	74AHCT	Buffer, Inverting	2 / 4	3-State	8, 8	4.5V ~ 5.5V	-40 ~ 125	20-TSSOP	Discontinued	966
SN74AHCT240PWR	Texas Instruments	74AHCT	Buffer, Inverting	2 / 4	3-State	8, 8	4.5V ~ 5.5V	-40 ~ 125	20-TSSOP	Active	4850
74AHCT240PW,118	Nexperia USA Inc.	74AHCT	Buffer, Inverting	2 / 4	3-State	8, 8	4.5V ~ 5.5V	-40 ~ 125	20-TSSOP	Active	3622
74AHCT240PW-Q100J	Nexperia USA Inc.	74AHCT	Buffer, Inverting	2 / 4	3-State	8, 8	4.5V ~ 5.5V	-40 ~ 125	20-TSSOP	Active	5688
74VHCT240AMTCX	Fairchild Semiconductor	74VHCT	Buffer, Inverting	2 / 4	3-State	8, 8	4.5V ~ 5.5V	-40 ~ 85	20-TSSOP	Active	5113
MC74VHCT240ADTRG	onsemi	74VHCT	Buffer, Inverting	2 / 4	3-State	8, 8	4.5V ~ 5.5V	-40 ~ 85	20-TSSOP	Active	2240

Engineering Selection Recommendations

Primary Recommendation: SN74AHCT240PWR (Texas Instruments) is the direct substitute with identical specifications and extended availability (4850 units in stock). This part maintains the original manufacturer lineage and full temperature range specification (-40°C ~ 125°C).

Alternative from Nexperia: 74AHCT240PW,118 provides equivalent functionality with active product status and substantial inventory (3622 units). This part is suitable for applications requiring the full 74AHCT temperature range.

Automotive Applications: 74AHCT240PW-Q100J (Nexperia USA Inc.) is specified for automotive-grade applications with AEC-Q100 qualification while maintaining identical electrical and thermal specifications. Highest inventory availability (5688 units).

Series Variant Consideration: 74VHCT240AMTCX (Fairchild Semiconductor) and MC74VHCT240ADTRG (onsemi) are functionally equivalent with the constraint of reduced operating temperature range (-40°C ~ 85°C). These parts are suitable for applications not requiring the extended upper temperature limit of 125°C.

Frequently Asked Questions (FAQ)

Q: Can SN74AHCT240PWR directly replace SN74AHCT240PW? A: Yes. SN74AHCT240PWR is a direct substitute with identical electrical specifications, output characteristics, supply voltage range, operating temperature range, and 20-TSSOP package. The difference is packaging format (Cut Tape & Digi-Reel vs Tube) and active product status.

Q: What is the difference between 74AHCT and 74VHCT series parts? A: Both series maintain identical logic functionality, element count, bit configuration, output type, and current ratings. The primary difference is operating temperature range: 74AHCT operates -40°C ~ 125°C, while 74VHCT operates -40°C ~ 85°C. Selection depends on application temperature requirements.

Q: Is 74AHCT240PW-Q100J suitable for non-automotive applications? A: Yes. The AEC-Q100 automotive qualification is an additional certification that does not restrict use in non-automotive applications. This part maintains all standard 74AHCT specifications and can be used in any application requiring the SN74AHCT240PW functionality.

Q: Are all substitute parts 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 mechanical and electrical compatibility with the original SN74AHCT240PW footprint.

Q: Which substitute has the highest inventory availability? A: 74AHCT240PW-Q100J (Nexperia USA Inc.) has the highest inventory with 5688 units in stock, followed by SN74AHCT240PWR (Texas Instruments) with 4850 units.

Q: Can I use MC74VHCT240ADTRG if my application operates at 100°C? A: No. MC74VHCT240ADTRG is specified for -40°C ~ 85°C operating range. For applications requiring operation above 85°C, use 74AHCT series parts (SN74AHCT240PWR, 74AHCT240PW,118, or 74AHCT240PW-Q100J) which support -40°C ~ 125°C.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message