SN74HC240IDWRCT Equivalent & Substitute Parts

Part Overview

The SN74HC240IDWRCT is an inverting buffer logic integrated circuit manufactured by Texas Instruments, designed for digital signal buffering and bus driving applications. This 20-SOIC surface mount device features 2 elements with 4 bits per element and 3-state output capability, operating across a 2V to 6V supply voltage range. The part is currently in active production status with 1003 units available in new original inventory. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity when the primary part becomes unavailable or when alternative sourcing is required.

Substiute Parts

SN74HC240IDWRCT

Texas InstrumentsIn Stock: 1050SN74HC240IDWRCT Datasheet

Current PartRFQ

MM74HC240WM

Fairchild SemiconductorIn Stock: 1993MM74HC240WM Datasheet

Parametric EquivalentRFQ

MM74HC240WMX

Fairchild SemiconductorIn Stock: 2558MM74HC240WMX Datasheet

Parametric EquivalentRFQ

SN74HC240DW

Texas InstrumentsIn Stock: 5330SN74HC240DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74HC240IDWRCT are qualified based on strict parametric equivalence across the following critical criteria:

Substitution-Determining Parameters:

• Logic Type: Buffer, Inverting (identical function)
• Number of Elements: 2 (identical configuration)
• Number of Bits per Element: 4 (identical bit width)
• Output Type: 3-State (identical output capability)
• Current - Output High, Low: 7.8mA, 7.8mA (identical drive capability)
• Voltage - Supply: 2V ~ 6V (identical operating range)
• Operating Temperature: -40°C ~ 85°C (TA) (identical thermal range)
• Package / Case: 20-SOIC (0.295", 7.50mm Width) (identical physical footprint)
• Mounting Type: Surface Mount (identical mounting method)
• Base Product Number: 74HC240 (identical logic family)

All identified substitute parts meet these parametric requirements without exception. Differences in manufacturer, packaging format (Bulk vs. Tube), inventory levels, and product status are noted but do not affect functional or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (Active Status, Full Compliance):

MM74HC240WMX (Fairchild Semiconductor) is the preferred substitute when SN74HC240IDWRCT availability is constrained. This part maintains active product status, offers the highest inventory level (2496 units), and provides complete parametric equivalence. Both Fairchild and Texas Instruments 74HC240 variants are established industry standards with interchangeable pinouts and electrical characteristics.

Secondary Selection (Active Status):

MM74HC240WM (Fairchild Semiconductor) serves as an alternative equivalent with 1900 units in stock and active product status. This part differs from MM74HC240WMX only in packaging format (Bulk vs. Bulk designation) and maintains identical electrical and mechanical specifications.

Tertiary Selection (Discontinued Status):

SN74HC240DW (Texas Instruments) is functionally equivalent but carries discontinued status at DiGi Electronics. Despite discontinuation at this distributor, 5240 units remain in inventory. This part is suitable for applications where Texas Instruments sourcing is preferred and inventory availability is confirmed through alternative channels. RoHS3 compliance is verified.

Compliance Considerations:

All substitute parts meet ROHS3 compliance requirements where specified. The 74HC240 logic family operates within identical voltage and temperature ranges, ensuring direct functional replacement in existing circuit designs without modification.

Frequently Asked Questions (FAQ)

Q: Can MM74HC240WM and MM74HC240WMX be used interchangeably with SN74HC240IDWRCT?

A: Yes. Both Fairchild parts are parametric equivalents with identical logic type, element count, bit width, output type, drive current, supply voltage range, operating temperature range, and 20-SOIC package footprint. Pinout compatibility is confirmed across all three parts.

Q: What is the difference between MM74HC240WM and MM74HC240WMX?

A: Both parts are parametrically identical. The designation difference reflects internal Fairchild product coding. Electrical performance, package dimensions, and pin assignments are equivalent. Selection between these two should be based on packaging format preference and inventory availability.

Q: Is SN74HC240DW suitable as a substitute despite discontinued status?

A: SN74HC240DW is functionally equivalent and maintains 5240 units in current inventory. Discontinued status at DiGi Electronics does not affect electrical or mechanical compatibility. This part is suitable for applications where supply chain verification confirms availability through alternative distribution channels.

Q: Are there any thermal or voltage derating considerations when substituting these parts?

A: No. All substitute parts operate within identical voltage ranges (2V ~ 6V) and temperature ranges (-40°C ~ 85°C). No derating or circuit modification is required when substituting between these qualified equivalents.

Q: Does package format (Bulk vs. Tube) affect electrical performance?

A: No. Package format affects only handling, storage, and ordering logistics. Electrical specifications, pinout, and functional performance are identical regardless of packaging format.

Q: Are all substitute parts RoHS3 compliant?

A: RoHS3 compliance is confirmed for SN74HC240IDWRCT and SN74HC240DW (both Texas Instruments). Fairchild parts (MM74HC240WM and MM74HC240WMX) do not specify RoHS status in provided documentation. Verify RoHS compliance requirements with your supply chain if regulatory compliance is mandatory for your application.

Q: Can these parts be used in new designs or only as replacements?

A: All substitute parts are suitable for new designs. The 74HC240 logic family is an established industry standard. Active product status for MM74HC240WMX and MM74HC240WM confirms ongoing manufacturing support for new applications.