SN74HC240APWRG4 Equivalent & Substitute Parts

Part Overview

The SN74HC240APWRG4 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 2V to 6V supply voltage range and is housed in a 20-TSSOP package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SN74HC240APWRG4

Texas InstrumentsIn Stock: 941SN74HC240APWRG4 Datasheet

Current PartRFQ

SN74HC240DWR

Texas InstrumentsIn Stock: 3100SN74HC240DWR Datasheet

MFR RecommendedRFQ

SN74HC240APWR

Texas InstrumentsIn Stock: 5022SN74HC240APWR Datasheet

Parametric EquivalentRFQ

SN74HC240PWR

Texas InstrumentsIn Stock: 3050SN74HC240PWR Datasheet

Parametric EquivalentRFQ

SN74HC240PWT

Texas InstrumentsIn Stock: 1667SN74HC240PWT Datasheet

Parametric EquivalentRFQ

74HC240PW-Q100,118

Nexperia USA Inc.In Stock: 97374HC240PW-Q100,118 Datasheet

MFR RecommendedRFQ

MM74HC240MTCX

Fairchild SemiconductorIn Stock: 3720MM74HC240MTCX Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74HC240APWRG4 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
• Operating Temperature: -40°C ~ 85°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 parts are grouped into two categories:

MFR Recommended Substitutes: Parts recommended by the original manufacturer as direct replacements, with active product status and full availability.

Parametric Equivalents: Parts that match all critical electrical and mechanical parameters but may differ in packaging format, product status, or manufacturer, providing alternative sourcing options.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (MFR Recommended):

SN74HC240DWR is the manufacturer-recommended substitute with active product status. This part maintains all critical electrical parameters and RoHS3 compliance. The primary difference is the package format: 20-SOIC (0.295", 7.50mm Width) versus the original 20-TSSOP. This package change requires PCB layout modification and is suitable for applications where board space constraints are less critical.

74HC240PW-Q100,118 (Nexperia USA Inc.) is an automotive-grade substitute with AEC-Q100 qualification and extended operating temperature range (-40°C ~ 125°C). This part is appropriate for automotive and industrial applications requiring higher temperature performance. The 20-TSSOP package matches the original form factor.

Parametric Equivalents (Same Package):

SN74HC240APWR and SN74HC240PWR are parametric equivalents in the original 20-TSSOP package with active product status. Both maintain identical electrical specifications and RoHS3 compliance. These parts differ only in packaging format (Tape & Reel versus Cut Tape & Digi-Reel) and represent the most direct substitutes for the obsolete SN74HC240APWRG4.

SN74HC240PWT is a parametric equivalent with discontinued status at DiGi Electronics, indicating limited future availability despite current inventory.

MM74HC240MTCX (Fairchild Semiconductor) is a parametric equivalent maintaining all critical electrical parameters in the 20-TSSOP package. This part provides cross-manufacturer sourcing flexibility.

Frequently Asked Questions (FAQ)

Q: Can SN74HC240DWR be used as a direct replacement for SN74HC240APWRG4?

A: SN74HC240DWR is electrically equivalent and manufacturer-recommended. However, it uses a 20-SOIC package instead of 20-TSSOP, requiring PCB redesign. All electrical parameters, supply voltage, output current, and operating temperature specifications are identical.

Q: What is the difference between the 20-TSSOP and 20-SOIC packages?

A: The 20-TSSOP package has a width of 0.173" (4.40mm), while the 20-SOIC package has a width of 0.295" (7.50mm). The SOIC package is larger and requires different PCB footprint design. Pin pitch and electrical characteristics remain compatible.

Q: Is 74HC240PW-Q100,118 suitable for non-automotive applications?

A: Yes. The automotive-grade qualification and extended temperature range (-40°C ~ 125°C) provide additional performance margin for any application. All electrical parameters match the original part, and RoHS3 compliance is maintained.

Q: Why is SN74HC240APWR listed as active when the original SN74HC240APWRG4 is obsolete?

A: The base part number 74HC240 remains in production by multiple manufacturers. The suffix designations (APWR, PWR, PWT, DWR) indicate different packaging formats and distribution channels. SN74HC240APWR represents the active production variant of the same logic device.

Q: Can I use MM74HC240MTCX from Fairchild Semiconductor as a substitute?

A: Yes. MM74HC240MTCX maintains all critical electrical parameters, output current specifications, supply voltage range, and operating temperature range. The 20-TSSOP package matches the original form factor, enabling direct PCB compatibility.

Q: What should I consider when selecting between multiple substitutes?

A: Prioritize based on: (1) Package compatibility with existing PCB design, (2) Product status and long-term availability, (3) Operating temperature requirements, (4) Manufacturer preference for supply chain consistency, (5) Packaging format requirements (Tape & Reel versus Cut Tape).