SN74AC240PW Equivalent & Substitute Parts

Part Overview

The SN74AC240PW 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-TSSOP surface mount device operates across a 2V to 6V supply voltage range and is rated for -40°C to 85°C operating temperature. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design requirements and procurement needs.

Substiute Parts

SN74AC240PW

Texas InstrumentsIn Stock: 1610SN74AC240PW Datasheet

Current PartRFQ

SN74AC240PWR

Texas InstrumentsIn Stock: 3358SN74AC240PWR Datasheet

DirectRFQ

MC74AC240DTR2G

onsemiIn Stock: 1612MC74AC240DTR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74AC240PW is determined by strict equivalence across the following critical parameters:

• Logic Type: Buffer, Inverting (functional operation must be identical)
• Number of Elements: 2
• Number of Bits per Element: 4
• Output Type: 3-State
• Current - Output High, Low: 24mA, 24mA (electrical performance)
• Voltage - Supply: 2V ~ 6V (operating range)
• Operating Temperature: -40°C ~ 85°C (TA)
• Package / Case: 20-TSSOP (0.173", 4.40mm Width) (mechanical compatibility)
• Mounting Type: Surface Mount

All identified substitutes maintain identical electrical and mechanical specifications across these parameters, ensuring direct functional replacement without circuit redesign.

Parameter Comparison

Engineering Selection Recommendations

SN74AC240PWR (Texas Instruments) is the direct equivalent substitute, maintaining identical electrical and mechanical specifications while offering active product status. This part is available in Tape & Reel packaging, which is standard for production environments. Current inventory of 3300 pieces supports ongoing procurement requirements.

MC74AC240DTR2G (onsemi) is the manufacturer-recommended alternative, providing equivalent functional performance with active product status. As a cross-manufacturer substitute from onsemi, this part maintains all critical electrical parameters and package specifications. Current inventory of 1592 pieces is available. Selection of this part may be appropriate when Texas Instruments supply is constrained or when onsemi qualification is preferred within your supply chain.

Both substitutes are ROHS3 compliant and carry identical MSL ratings, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can SN74AC240PWR directly replace SN74AC240PW without circuit modification?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters. The primary difference is packaging format (Tube versus Tape & Reel) and product status (Active versus Discontinued). No circuit redesign is required.

Q: What is the difference between SN74AC240PW and SN74AC240PWR?

A: The SN74AC240PWR is the active production equivalent supplied in Tape & Reel packaging, while the SN74AC240PW was supplied in Tube packaging and is now discontinued. Electrical specifications and pinout are identical.

Q: Is MC74AC240DTR2G compatible with designs specified for SN74AC240PW?

A: Yes. The MC74AC240DTR2G meets all electrical and mechanical requirements for direct substitution. It is a cross-manufacturer equivalent from onsemi with identical logic type, element count, bit configuration, output type, current ratings, voltage range, temperature rating, and package specification.

Q: Are there any compliance or certification differences between these parts?

A: No. All three parts carry identical RoHS3 compliance status, MSL ratings, REACH status, and ECCN classifications. They are equivalent from a regulatory and environmental standpoint.

Q: What packaging considerations should I account for when switching between these parts?

A: SN74AC240PWR and MC74AC240DTR2G are supplied in Tape & Reel format, which is standard for automated assembly. If your procurement or assembly process requires Tube packaging, alternative sourcing may be necessary. All three parts use the same 20-TSSOP package footprint and are mechanically interchangeable on PCBs.