SN74AHCT240PWRG4 Equivalent & Substitute Parts

Part Overview

The SN74AHCT240PWRG4 is a Buffer, Inverting logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This device operates across a 4.5V to 5.5V supply voltage range and is housed in a 20-TSSOP surface mount package. The part is currently discontinued at DiGi Electronics, making equivalent and substitute parts essential for ongoing design support and production continuity.

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

Substitution for the SN74AHCT240PWRG4 is determined by strict equivalence across the following critical parameters:

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
Package / Case: 20-TSSOP
Mounting Type: Surface Mount

Substitute parts are grouped into two categories: Parametric Equivalents (identical electrical and mechanical specifications) and Manufacturer Recommended alternatives (functionally equivalent with minor operational differences in temperature range).

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range (°C)	Package	Product Status
SN74AHCT240PWRG4	Texas Instruments	74AHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40 ~ 125	20-TSSOP	Discontinued
SN74AHCT240PWR	Texas Instruments	74AHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40 ~ 125	20-TSSOP	Active
74AHCT240PW,118	Nexperia USA Inc.	74AHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40 ~ 125	20-TSSOP	Active
74AHCT240PW-Q100J	Nexperia USA Inc.	74AHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40 ~ 125	20-TSSOP	Active
74VHCT240AFT	Toshiba Semiconductor and Storage	74VHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40 ~ 125	20-TSSOP	Active
MC74VHCT240ADTRG	onsemi	74VHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40 ~ 85	20-TSSOP	Active
74VHCT240AMTCX	Fairchild Semiconductor	74VHCT	Buffer, Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40 ~ 85	20-TSSOP	Active

Engineering Selection Recommendations

For direct replacement of the discontinued SN74AHCT240PWRG4, the SN74AHCT240PWR from Texas Instruments is the primary choice, maintaining identical electrical specifications, temperature range (-40°C to 125°C), and series designation while offering active product status.

The Nexperia USA Inc. parts 74AHCT240PW,118 and 74AHCT240PW-Q100J provide parametric equivalence with full temperature range support. The 74AHCT240PW-Q100J includes AEC-Q100 automotive qualification, suitable for applications requiring automotive-grade components.

The 74VHCT series alternatives (74VHCT240AFT from Toshiba, MC74VHCT240ADTRG from onsemi, and 74VHCT240AMTCX from Fairchild Semiconductor) maintain electrical equivalence but operate within a reduced temperature range (-40°C to 85°C). These are suitable for applications not requiring the full -40°C to 125°C operating window. All substitute parts maintain ROHS3 compliance and identical package specifications.

Frequently Asked Questions (FAQ)

Q: Can the 74VHCT240 series parts directly replace the SN74AHCT240PWRG4?

A: The 74VHCT240 series maintains electrical equivalence in voltage supply, output current, logic function, and package. However, the operating temperature range is limited to -40°C to 85°C compared to the original -40°C to 125°C. Substitution is valid only if your application does not require operation above 85°C.

Q: What is the difference between the 74AHCT and 74VHCT series?

A: Both series provide identical electrical performance for the specified parameters. The primary difference is the maximum operating temperature: 74AHCT supports -40°C to 125°C, while 74VHCT supports -40°C to 85°C. Series selection depends on thermal requirements of your application.

Q: Are all substitute parts available in the same packaging?

A: Yes. All listed substitute parts are available in the 20-TSSOP surface mount package with identical dimensions (0.173", 4.40mm Width). Packaging options vary by supplier (Cut Tape, Tape & Reel, Bulk), but the physical component package remains consistent.

Q: Is the 74AHCT240PW-Q100J suitable for automotive applications?

A: Yes. The 74AHCT240PW-Q100J carries AEC-Q100 automotive qualification and is graded for automotive use. This part is appropriate for automotive-grade designs requiring the full -40°C to 125°C operating range.

Q: What compliance certifications apply to these substitute parts?

A: All listed parts are ROHS3 compliant. The 74AHCT240PW-Q100J includes AEC-Q100 automotive qualification. All parts are classified as REACH Unaffected and carry ECCN EAR99 designation.

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