CD74AC240M Equivalent & Substitute Parts

Part Overview

The CD74AC240M is a Buffer, Inverting logic IC manufactured by Texas Instruments in the 74AC series. This device functions as a 2-element, 4-bit per element inverting buffer with 3-state output capability, housed in a 20-SOIC package. The CD74AC240M is designated as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this inverting buffer functionality.

Substiute Parts

CD74AC240M

Texas InstrumentsIn Stock: 1624CD74AC240M Datasheet

Current PartRFQ

CD74AC240M96

Texas InstrumentsIn Stock: 2194CD74AC240M96 Datasheet

MFR RecommendedRFQ

74AC240SC

Fairchild SemiconductorIn Stock: 310474AC240SC Datasheet

MFR RecommendedRFQ

MC74AC240DWG

onsemiIn Stock: 1190MC74AC240DWG Datasheet

MFR RecommendedRFQ

MC74AC240DWR2G

onsemiIn Stock: 1040MC74AC240DWR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74AC240M 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: 24mA, 24mA
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 85°C (TA)

Substitute parts must maintain identical functional specifications and physical packaging. Voltage supply ranges may vary within acceptable operating margins. Packaging format (Tube, Tape & Reel, Bulk) does not affect electrical equivalence but impacts procurement and handling requirements.

Parameter Comparison

Engineering Selection Recommendations

CD74AC240M96 is the primary substitute, manufactured by Texas Instruments with Active product status. This part maintains identical electrical specifications and voltage supply range (1.5V ~ 5.5V) as the main part. The only difference is packaging format (Tape & Reel versus Tube), which does not affect electrical performance. ROHS3 compliance and MSL 1 rating match the original specification.

MC74AC240DWR2G, manufactured by onsemi, is an Active product offering full functional equivalence. The voltage supply range extends to 6V, providing broader operating margin. MSL 3 rating requires controlled moisture handling during storage and assembly. ROHS3 compliance is maintained.

74AC240SC, manufactured by Fairchild Semiconductor, is an Active product with functional equivalence. Voltage supply range extends to 2V ~ 6V. RoHS and MSL specifications are not provided in available documentation.

MC74AC240DWG, manufactured by onsemi, carries Obsolete product status and should be avoided for new designs despite functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can CD74AC240M96 directly replace CD74AC240M in existing designs?

A: Yes. CD74AC240M96 is electrically identical to CD74AC240M. The difference is packaging format (Tape & Reel versus Tube). Both maintain the same 20-SOIC package, electrical specifications, and operating characteristics. No circuit modifications are required.

Q: What is the significance of the voltage supply range difference between CD74AC240M (1.5V ~ 5.5V) and 74AC240SC (2V ~ 6V)?

A: The CD74AC240M operates at lower minimum voltage (1.5V) and lower maximum voltage (5.5V). The 74AC240SC operates at higher minimum voltage (2V) and higher maximum voltage (6V). For applications operating within the 2V ~ 5.5V range, both parts are compatible. For applications requiring operation below 2V or above 5.5V, part selection must match the specific voltage requirements.

Q: Why is MC74AC240DWG marked as Obsolete?

A: MC74AC240DWG carries Obsolete product status, indicating the manufacturer has discontinued production. While functionally equivalent, this part should not be selected for new designs due to limited availability and potential supply discontinuation.

Q: What is the difference between CD74AC240M and CD74AC240M96 beyond packaging?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications. CD74AC240M is supplied in Tube packaging and carries Last Time Buy status. CD74AC240M96 is supplied in Tape & Reel packaging and carries Active product status. For ongoing production, CD74AC240M96 is the recommended choice.

Q: Are there any moisture sensitivity considerations when selecting a substitute?

A: CD74AC240M and CD74AC240M96 both carry MSL 1 (Unlimited), requiring no special moisture control. MC74AC240DWR2G and MC74AC240DWG carry MSL 3 (168 Hours), requiring controlled moisture exposure during storage and assembly. If moisture-sensitive handling is not available in your manufacturing process, select parts with MSL 1 rating.

Q: Can these parts be used interchangeably in high-temperature applications?

A: All listed parts maintain identical operating temperature range of -40°C ~ 85°C (TA). No differentiation exists for temperature performance across the substitute group.