SN74HC240PWT Equivalent & Substitute Parts

Part Overview

The SN74HC240PWT is a logic buffer IC manufactured by Texas Instruments, classified as a Buffer, Inverting component with 2 elements and 4 bits per element. This device features 3-state output capability and operates across a 2V to 6V supply voltage range. The part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74HC240PWT
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	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution for the SN74HC240PWT 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: 7.8mA, 7.8mA
Voltage - Supply: 2V ~ 6V
Package / Case: 20-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount

Substitute parts are grouped into three categories based on product status and manufacturer recommendation:

Parametric Equivalents: Parts meeting all electrical and mechanical specifications with identical or compatible operating ranges
Upgrade Options: Parts with extended operating temperature ranges or enhanced specifications
Manufacturer Recommended: Parts explicitly recommended by manufacturers for direct substitution

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Voltage Supply	Temp Range (°C)	Package	Product Status
SN74HC240PWT	Texas Instruments	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-TSSOP	Discontinued
SN74HC240APWR	Texas Instruments	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-TSSOP	Active
SN74HC240PWR	Texas Instruments	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-TSSOP	Active
74HC240PW,118	Nexperia USA Inc.	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 125	20-TSSOP	Active
74HC240PW-Q100,118	Nexperia USA Inc.	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 125	20-TSSOP	Active
MC74HC240ADTR2G	onsemi	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	20-TSSOP	Active
MM74HC240MTCX	Fairchild Semiconductor	Buffer, Inverting	2	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-TSSOP	Active

Engineering Selection Recommendations

For direct replacement of the discontinued SN74HC240PWT, the following selection criteria apply:

Texas Instruments Alternatives (Same Manufacturer): SN74HC240APWR and SN74HC240PWR are active Texas Instruments products with identical electrical specifications and operating temperature ranges. These represent the most direct substitutes with no design modifications required.

Extended Temperature Range Options: 74HC240PW,118 (Nexperia) and MC74HC240ADTR2G (onsemi) provide extended operating temperature ranges (-40°C to 125°C and -55°C to 125°C respectively), offering enhanced performance margins for applications requiring wider temperature operation.

Automotive Grade Option: 74HC240PW-Q100,118 (Nexperia) includes AEC-Q100 automotive qualification and extended temperature range, suitable for automotive and high-reliability applications.

Fairchild Alternative: MM74HC240MTCX (Fairchild Semiconductor) maintains identical specifications to the original part with active product status.

All substitute parts maintain ROHS3 compliance and identical package geometry (20-TSSOP), ensuring mechanical and electrical compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can SN74HC240APWR directly replace SN74HC240PWT without design changes? A: Yes. SN74HC240APWR is a parametric equivalent with identical logic type, element count, bit configuration, output type, current ratings, supply voltage, operating temperature range, and package specifications. No design modifications are required.

Q: What is the difference between SN74HC240PWR and SN74HC240APWR? A: Both are Texas Instruments products with identical electrical and thermal specifications. The primary difference is packaging format: SN74HC240PWR is supplied in Cut Tape (CT) & Digi-Reel format, while SN74HC240APWR is supplied in Tape & Reel (TR) format.

Q: Why would I select 74HC240PW,118 over SN74HC240APWR? A: 74HC240PW,118 (Nexperia) extends the operating temperature range to -40°C to 125°C compared to -40°C to 85°C for the Texas Instruments variant. This provides additional thermal margin for applications operating at elevated temperatures.

Q: Is MC74HC240ADTR2G suitable for all applications requiring SN74HC240PWT? A: MC74HC240ADTR2G (onsemi) meets all electrical and mechanical requirements. Its extended temperature range (-55°C to 125°C) provides enhanced performance for extreme temperature environments. Verify compliance with any specific manufacturer certifications your application requires.

Q: What does the AEC-Q100 qualification on 74HC240PW-Q100,118 indicate? A: AEC-Q100 qualification indicates the part meets automotive industry reliability and quality standards. This variant is suitable for automotive applications and high-reliability environments requiring formal automotive-grade components.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, consistent with the original SN74HC240PWT specification.

Q: Can I use MM74HC240MTCX as a substitute? A: Yes. MM74HC240MTCX (Fairchild Semiconductor) is a parametric equivalent with identical specifications and active product status. It maintains the same operating temperature range and package configuration as the original part.

Q: Do all substitutes use the same 20-TSSOP package? A: Yes. All substitute parts use the 20-TSSOP (0.173", 4.40mm Width) package, ensuring identical PCB footprint and pin compatibility.

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