SN74HCT240NS Equivalent & Substitute Parts

Part Overview

The SN74HCT240NS is a Buffer, Inverting logic integrated circuit manufactured by Texas Instruments. This device features 2 elements with 4 bits per element and 3-state output capability, housed in a 20-SOIC surface mount package. The SN74HCT240NS is currently discontinued at DiGi Electronics, making identification of equivalent substitute parts essential for ongoing design support and procurement.

The primary reason for identifying substitute parts is the discontinued product status of the SN74HCT240NS. Active equivalent models ensure continued availability for new production runs, repairs, and system maintenance without requiring circuit redesign.

Substiute Parts

SN74HCT240NS

Texas InstrumentsIn Stock: 1960SN74HCT240NS Datasheet

Current PartRFQ

SN74HCT240NSR

Texas InstrumentsIn Stock: 4721SN74HCT240NSR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HCT240NS is determined by strict equivalence across the following critical parameters:

Functional Parameters:

• Logic Type: Buffer, Inverting
• Number of Elements: 2
• Number of Bits per Element: 4
• Output Type: 3-State

Electrical Parameters:

• Current - Output High, Low: 6mA, 6mA
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: -40°C ~ 85°C (TA)

Physical Parameters:

• Package / Case: 20-SOIC (0.209", 5.30mm Width)
• Mounting Type: Surface Mount

Compliance Parameters:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts must match all parameters listed above. Packaging format (tube versus tape & reel) does not affect functional or electrical equivalence and does not preclude substitution.

Parameter Comparison

Engineering Selection Recommendations

The SN74HCT240NSR is a direct functional and electrical equivalent to the SN74HCT240NS. Both parts are manufactured by Texas Instruments, share identical logic specifications, electrical characteristics, and physical package dimensions. The primary distinction is product status: the SN74HCT240NS is discontinued, while the SN74HCT240NSR maintains active status with higher inventory availability (4678 Pcs in stock versus 1900 Pcs for the discontinued part).

Both parts meet ROHS3 compliance requirements and carry MSL Level 1 (Unlimited) moisture sensitivity ratings, ensuring equivalent reliability and environmental compliance for production applications.

The SN74HCT240NSR is supplied in Tape & Reel format, which is standard for high-volume manufacturing and automated assembly processes. This packaging format does not affect electrical performance or functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SN74HCT240NSR directly replace the SN74HCT240NS in existing designs?

A: Yes. The SN74HCT240NSR is electrically and functionally identical to the SN74HCT240NS. All logic specifications, electrical parameters, supply voltage ranges, output current ratings, operating temperature ranges, and package dimensions are equivalent. Direct substitution is valid without circuit modification.

Q: What is the difference between the SN74HCT240NS and SN74HCT240NSR?

A: The primary differences are product status and packaging format. The SN74HCT240NS is discontinued and supplied in tube packaging. The SN74HCT240NSR is an active product supplied in Tape & Reel format. Electrical and functional specifications are identical.

Q: Does the Tape & Reel packaging of the SN74HCT240NSR affect compatibility?

A: No. Tape & Reel packaging is a supply format used for automated assembly and high-volume production. It does not alter the electrical characteristics, pin configuration, or functional performance of the device. The component itself is identical to tube-packaged versions.

Q: Are both parts RoHS compliant?

A: Yes. Both the SN74HCT240NS and SN74HCT240NSR are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings.

Q: Why is the SN74HCT240NS discontinued?

A: Product discontinuation decisions are made by manufacturers based on market demand and product lifecycle management. The SN74HCT240NSR remains in active production and serves as the current equivalent for this logic function.