CD74HC240M Equivalent & Substitute Parts

Part Overview

The CD74HC240M is a Buffer, Inverting logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. This 20-SOIC surface mount device operates across a 2V to 6V supply voltage range and is compliant with ROHS3 standards. The part is currently in Last Time Buy status, making identification of equivalent and substitute components essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Base Product Number	74HC240
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 Range	-55°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.295", 7.50mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD74HC240M is determined by strict equivalence across the following critical parameters:

Base product number: 74HC240
Logic type: Buffer, Inverting
Element and bit configuration: 2 elements, 4 bits per element
Output type: 3-State
Output current capability: 7.8mA (high and low)
Supply voltage range: 2V ~ 6V
Package type: 20-SOIC surface mount
Mechanical dimensions: 0.295" × 7.50mm width

Substitute parts are grouped by manufacturer and packaging configuration. Packaging variations (Tube, Tape & Reel, Cut Tape, Bulk) do not affect electrical equivalence. Operating temperature range, moisture sensitivity level, and product status are secondary considerations that may influence selection based on application requirements and procurement availability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Packaging	Logic Type	Elements / Bits	Output Type	Current (mA)	Supply Voltage	Temp Range (°C)	Package	Product Status
CD74HC240M	Texas Instruments	Tube	Buffer, Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	20-SOIC	Last Time Buy
CD74HC240M96	Texas Instruments	Tape & Reel	Buffer, Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	20-SOIC	Active
74HC240D,653	Nexperia USA Inc.	Cut Tape & Digi-Reel	Buffer, Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 125	20-SOIC	Active
74HC240D-Q100,118	NXP USA Inc.	Bulk	Buffer, Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 125	20-SOIC	Active
MC74HC240ADWR2G	onsemi	Tape & Reel	Buffer, Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	20-SOIC	Active
MM74HC240WM	Fairchild Semiconductor	Bulk	Buffer, Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SOIC	Active
MM74HC240WMX	Fairchild Semiconductor	Bulk	Buffer, Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-SOIC	Active
MC74HC240ADWG	onsemi	Tube	Buffer, Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	20-SOIC	Active

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical equivalence to the CD74HC240M across the 74HC240 base product family. Selection among substitutes should be based on the following criteria:

For Active Product Status: CD74HC240M96 (Texas Instruments, Tape & Reel) provides direct continuation from the original manufacturer with identical temperature range (-55°C to 125°C) and is available in high volume. MC74HC240ADWR2G (onsemi, Tape & Reel) and MC74HC240ADWG (onsemi, Tube) offer equivalent performance with active product status and extended temperature range support.

For Automotive Applications: 74HC240D-Q100,118 (NXP USA Inc.) includes AEC-Q100 qualification and automotive-grade designation, suitable for automotive and harsh environment applications.

For Restricted Temperature Applications: MM74HC240WM and MM74HC240WMX (Fairchild Semiconductor) operate within -40°C to 85°C range and are suitable for commercial and industrial applications with narrower temperature requirements.

For Packaging Flexibility: Nexperia's 74HC240D,653 is available in Cut Tape & Digi-Reel packaging, offering alternative procurement options while maintaining active product status.

All substitute parts comply with ROHS3 standards and maintain identical supply voltage (2V ~ 6V), output current (7.8mA), and 20-SOIC package specifications.

Frequently Asked Questions (FAQ)

Q: Can I substitute CD74HC240M with any of the listed parts without circuit modification?

A: Yes. All listed parts are electrically and mechanically equivalent within the 74HC240 product family. They share identical logic type (Buffer, Inverting), element configuration (2 elements, 4 bits per element), output type (3-State), output current (7.8mA), supply voltage range (2V ~ 6V), and 20-SOIC package dimensions. No circuit modifications are required for substitution.

Q: What is the difference between packaging types (Tube, Tape & Reel, Cut Tape, Bulk)?

A: Packaging types affect procurement and handling methods but do not impact electrical performance. Tube packaging is suitable for manual assembly and small quantities. Tape & Reel packaging is optimized for automated pick-and-place assembly. Cut Tape & Digi-Reel offers flexibility for mixed-volume orders. Bulk packaging is used for high-volume direct assembly. Select packaging based on your assembly process and order volume requirements.

Q: Why does CD74HC240M have Last Time Buy status?

A: Last Time Buy status indicates that Texas Instruments is discontinuing this specific part number. The CD74HC240M96 variant (Tape & Reel packaging) remains in Active status from the same manufacturer and provides direct continuation. Alternative manufacturers (Nexperia, NXP, onsemi, Fairchild) offer equivalent 74HC240 devices in Active status for long-term availability.

Q: Are there temperature range differences between substitutes?

A: Yes. CD74HC240M, CD74HC240M96, MC74HC240ADWR2G, and MC74HC240ADWG operate across -55°C to 125°C. The 74HC240D,653 and 74HC240D-Q100,118 operate across -40°C to 125°C. MM74HC240WM and MM74HC240WMX operate across -40°C to 85°C. Select based on your application's temperature requirements. Extended range (-55°C to 125°C) parts are suitable for military, aerospace, and industrial applications. Commercial range (-40°C to 85°C) parts are suitable for standard commercial and industrial use.

Q: What does ROHS3 compliance mean for substitution?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements. All listed substitutes maintain ROHS3 compliance, ensuring environmental and regulatory compatibility. This does not affect electrical substitution but confirms regulatory alignment for applications requiring ROHS compliance.

Q: Can I use MM74HC240WM or MM74HC240WMX if my application requires -55°C operation?

A: No. MM74HC240WM and MM74HC240WMX are rated only to -40°C minimum. For applications requiring -55°C operation, use CD74HC240M96, MC74HC240ADWR2G, MC74HC240ADWG, or the original CD74HC240M. Verify your application's actual minimum operating temperature before selecting a substitute with a narrower temperature range.

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