SN74HC240NS Equivalent & Substitute Parts

Part Overview

The SN74HC240NS is a Buffer, Inverting logic integrated circuit manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. The device is packaged in a 20-SOIC surface mount configuration and operates across a supply voltage range of 2V to 6V with an operating temperature range of -40°C to 85°C.

The SN74HC240NS has been discontinued at DiGi Electronics. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure project timelines, and secure component availability for production and prototyping applications.

Substiute Parts

SN74HC240NS

Texas InstrumentsIn Stock: 4135SN74HC240NS Datasheet

Current PartRFQ

SN74HC240NSR

Texas InstrumentsIn Stock: 14744SN74HC240NSR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HC240NS 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: 7.8mA, 7.8mA
• Voltage - Supply: 2V ~ 6V
• 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)

The substitute part SN74HC240NSR maintains identical functional, electrical, and physical specifications. The primary distinction is packaging format: the substitute is supplied in Tape & Reel (TR) configuration versus the original part's standard packaging, and the substitute maintains Active product status.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC240NSR is a direct functional equivalent to the SN74HC240NS. Both devices are manufactured by Texas Instruments and share identical electrical, functional, and physical specifications within the 74HC logic series.

Selection Basis:

The SN74HC240NSR is recommended for new designs and component replenishment due to its Active product status. The original SN74HC240NS, being discontinued at DiGi Electronics, presents supply chain constraints for ongoing procurement.

Both parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols.

The SN74HC240NSR is supplied in Tape & Reel (TR) packaging, which is standard for high-volume production environments. If single-unit or small-quantity procurement is required, availability in alternative packaging formats should be verified with the supplier.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC240NSR be used as a direct replacement for the SN74HC240NS in existing designs?

A: Yes. The SN74HC240NSR is functionally and electrically identical to the SN74HC240NS. Both devices feature the same logic type (Buffer, Inverting), element configuration (2 elements, 4 bits per element), output type (3-State), electrical ratings (7.8mA output current, 2V–6V supply), operating temperature range (−40°C to 85°C), and package format (20-SOIC surface mount). Pin-to-pin compatibility is maintained.

Q: What is the difference between the SN74HC240NS and SN74HC240NSR?

A: The primary difference is packaging format and product status. The SN74HC240NSR is supplied in Tape & Reel (TR) configuration, which is optimized for automated assembly and high-volume production. The SN74HC240NS was supplied in standard packaging. The SN74HC240NSR maintains Active product status, while the SN74HC240NS is discontinued at DiGi Electronics.

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

A: No. Both the SN74HC240NS and SN74HC240NSR are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating. Both meet the same environmental and regulatory standards.

Q: Is the 20-SOIC package footprint identical between both parts?

A: Yes. Both parts use the 20-SOIC package with dimensions of 0.209 inches (5.30mm width). PCB footprints and land patterns are identical, requiring no design modifications for substitution.

Q: What inventory considerations should be evaluated?

A: The SN74HC240NS has 4,088 pieces in stock (new original), while the SN74HC240NSR has 14,700 pieces in stock (new original). The higher inventory level of the SN74HC240NSR reflects its Active product status and suitability for ongoing procurement.